According to the relaxed power, the far point in meter unit is 0.28 meters.
We need to know about the relaxed power of the eye to solve this problem. Relaxed power can be defined as the ability of the optical device to see. It can be represented by a dioptre unit. The relaxed power formula is
P = 1/di + 1/do
where P is power of the eye, di is distance between eye lens and image and do is distance between eye lens and image.
From question above, the given parameters are
P = 53.6 d
di = 2 cm = 0.02 m
By substituting the given parameters, we can calculate the far point
P = 1/di + 1/do
53.6 = 1/0.02 + 1/do
1/do = 53.6 - 50
1/do = 3.6
do = 1/3.6
do = 0.28 m
Hence, the far point in meter unit is 0.28 meters.
For more on relaxed power at: https://brainly.com/question/15445779
#SPJ4
According to the graph, the velocity is approximately..?
As we know velocity is the rate of change of position with respect to time.
Mathematically [tex]Velocity = \frac{Position}{Time}[/tex]
Also, in a position-time graph, the velocity of a moving object can be represented by the slope of the graph i.e. Tan[tex]\alpha[/tex].
[tex]\alpha[/tex] is the angle made by the slope by the horizontal X-axis.
Distance travelled by the object is recorded on the Y-axis and time taken to complete that particular distance is noted on X-axis.
[tex]Tan\alpha = \frac{Position}{Time}[/tex]
[tex]Tan\alpha = Velocity = \frac{x}{t}[/tex]
According to the graph
for x = 8m, t = 2s
[tex]Tan \alpha = \frac{8}{2}[/tex] = 4 m/s
for x = 12m, t = 3s
[tex]Tan\alpha = \frac{12}{3}[/tex] = 4 m/s
Therefore for every change in distance, the time changes linearly which gives constant velocity as 4m/s.
Option (d) 4 m/s
To know more about velocity,
https://brainly.com/question/28308958
#SPJ1
you are a scientist studying the behavior of fish. you decide to conduct a thermodynamic analysis of the fish to determine their efficiency at gaining weight. if you define the fish as your system, would it be an open, closed, or isolated system? or does the type of system depend on some other facto
If the fish is considered as the system, it is an open system
All living things are an open system, since there is a constant exchange of energy and matter with the environment. In this case the fish moves and breathes which will result in a work on the environment.
Thermodynamic analysis is used to study the nature's most diversified energy change. Some of the methods of Thermodynamic analysis are pinch analysis, exergy analysis, second law analysis, and equipartition principles.
Therefore, if the fish is considered as the system, it is an open system
To know more about open systems
https://brainly.com/question/12349841
#SPJ4
What is the number of oxygen atom(s) on which the negative charge will resonate following relevant resonance structures?
Two oxygen atoms would share the negative charge.
What are resonance structures?There are some compounds in which a single structure is insufficient to explain the properties of the compound. In that case, we have to involve a number of other structures which contributes to the overall structure of the molecule to different extents.
The arrows are used to show the transformation of the structures of the compounds. Looking at the structures as it has been shown here, we know that the oxygen atoms that would be involved in the resonance are the oxygen atoms that are in the conjugated system.
There are two oxygen atoms in the conjugated system hence they will share the negative charge.
Learn more about resonance structure:https://brainly.com/question/23287285
#SPJ1
A Man's mass on earth is 45kg. What is his mass and weight on space
The correct answer is 441 N.
The force that pulls objects toward the centre of the Earth is known as earth gravity. The acceleration of all the bodies that are affected by gravity is almost equal to the strength of the gravitational field.
The force exerted on an object by gravity is known as the weight of a body.
As a result, we can state that weight is only a force.
Given that the mass of a person on earth is = 45 kg
and that gravity's acceleration on earth is = 9.8 ms^2.
Weight, then, is defined as mass multiplied by the gravitational acceleration, or W = m × g.
W = 45 × 9.8
W = 441 N
Hence, the total weight on Earth will be 441 Newton.
To learn more about acceleration due to gravity refer the link:
https://brainly.com/question/17331289
#SPJ9
why did a glass bottle with a water burst at night in the cold on a glazed balcony?
Answer:
i guess if the a glass gets to cold it will bust
Explanation:
PLEASE HELP Describe the difference between a simple machine and a complex machine. Give an example of each.
Answer:
SImple machine:A machine with few or no moving parts that is used to make work easier.
Example: Wedge, inclined plane, screw, etc.
Complex machine: A machine that is a combination of two or more simple machines.
Example: Car, refrigerator, sewing machine, etc.
Explanation:
Answer:
a simple machine is a machine with few or no moving parts that is used to make work easier, such as a wedge or screw. a complex machine is a combination of two or more simple machines, such as a car, sewing machine or refrigerator.
Explanation:
Which of the following is NOT a correct variable assignment?
Group of answer choices
A. name = "Ada"
B. test = 98
C. “Ada” = x
D. name = “Ada” + “Ada”
this is Python btw
Answer:
Choice C
Explanation:
In any programming language, the variable cannot be in quotes.
Many languages regard a string as literal if it is surrounded by a single quote rather than a double quote. Any computer language prohibits putting quotations around a variable. Thus, option C is correct.
What are the variables in programming language?Only letters (including uppercase and lowercase characters), numbers, and underscore are permitted in variable names.
A variable's first letter must either be a letter or an underscore. There is no restriction on the length of a variable name or identifier.
Usually, an experiment contains independent, dependent, and controlled variables.
Therefore, A variable in programming is a value that can change based on external factors or data that has been supplied to the program.
Learn more about variables here:
https://brainly.com/question/28592557
#SPJ2
Advantages and disadvantages of refracting telescope
Answer:
The refractor telescope has many advantages and disadvantages. One of the disadvantages is that the lenses are made of glasses therefore it has to be perfect with no air bubbles or scratches in the glass as this will impair the users viewing. Another disadvantage is that lense are weakest around the edges because they are thinnest there and that is the only place they are being supported by the telescope so this can lead to easy breakage. The lense can have colour distortion which means when white light goes through the lense it is split into colours. Since violet right is refracted more than red, the violet is brought to a focus clearer and this will make the image coloured and blurred, this is called chromatic aberration. Some advantages of refractor telescopes is that refractor telescopes are rugged meaning it is more resistant to misalignment than the reflector telescopes after their initial alignment. The glass surfaces don’t really need cleaning because it is sealed from the atmosphere this is efficient! The images are sharper, steadier and better than a reflector telescope because the tube is closed off from the outside and there will be no effects of changing temperatures or air currents. The focal length of a lense is proportional to the size of the image that is produced. Therefore if the focal length is longer the image will be larger. How bright an image will be also depends on how much light is collected by the telescope.
A student drops a ball from the top of a 24 m tall building. Ignoring air resistance, how long did it take for the ball to hit the ground?
Answer:
1.11111 century mother duck
a piece of plywood in which several holes are being drilled successively has been secured to a workbench by means of two nails. knowing that the drill exerts a 12-n⋅m couple on the piece of plywood, determine the magnitude of the resulting forces applied to the nails if they are located (a) at a and b, (b) at b and c, (c) at a and c.
The measure of a force is known as the magnitude of the force. When two or more forces act on a body, the total sum of the forces acting on it is known as the magnitude of the resultant force.
In simpler terms, the sum of the total force is the resultant force.
The magnitude of the resulting forces can be calculated by
[tex]R = \frac{Couple}{Position}[/tex] where R is the resultant force.
Forces at
(a) A and B
AB = 0.45m
R * (0.45m) = 12 N-m
R = [tex]\frac{12}{0.45}[/tex]
R = 26.66 N
(b) B and C
BC = 0.24m
R * (0.24m) = 12 N-m
R = [tex]\frac{12}{0.24}[/tex]
R = 50 N
(c) A and C
AC = [tex]\sqrt{AB^{2} +BC^{2} }[/tex]
AC = [tex]\sqrt{(0.45)^{2} + (0.24)^{2} }[/tex]
AC = 0.51m
R * (0.51m) = 12 N-m
R = [tex]\frac{12}{0.51}[/tex]
R = 23.9 N
To know more about magnitude of the force,
https://brainly.com/question/14504032
#SPJ4
choose the correct realistic problem for which this is the correct equation. choose the correct realistic problem for which this is the correct equation. at what distance along the axis of a charged disk is the electric field strength double its value at the center of the disk? give your answer in terms of the disk's radius r . at what distance along the axis of a charged disk is the electric field strength half its value at the center of the disk? give your answer in terms of the disk's radius r . at what distance along the axis of a charged square is the electric field strength double its value at the center of the square? give your answer in terms of the square's side r . at what distance along the axis of a charged square is the electric field strength half its value at the center of the square? give your answer in terms of the square's side r .
The correct realistic problem for the given equation is problem 1 in which the electric field strength of the disc is half its value at the center of the disk.
We know that,
Electric field of a charged disc at a distance along its axis is given by,
E = σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) )
Electric field at the centre of a charged disc is given by,
[tex]E_{c}[/tex] = σ / 2 ε ( Since at centre, x = 0 )
Distance along the axis of a charged disk, where electric field strength's value is half its value at the center of the disk.
[tex]E_{x}[/tex] = [tex]E_{c}[/tex] / 2
σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) ) = ( σ / 2 ε ) / 2
x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) = 1 / 2
4 [tex]x^{2}[/tex] = [tex]x^{2}[/tex] + [tex]r^{2}[/tex]
3 [tex]x^{2}[/tex] = [tex]r^{2}[/tex]
x = r / √ 3 ,which is the correct distance, when magnitude is half its value from centre.
Electric field is a field that surrounds electrically charged particles that exerts force on other charged particles in the field.
Therefore, the given equation is suitable for Electric field of a charged disc at a distance along its axis where electric field strength's value is half its value at the center of the disk.
The given question is incomplete. The completed question is
You are given the following equation to solve a problem:
σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) ) = [tex]E_{c}[/tex] = σ / 2 ε
Choose the most realistic problem for which this could be the correct equation.
1 ) At what distance along the axis of a charged disk is the electric field strength half its value at the center of the disk? Give your answer in terms of the disk's radius R.
2 ) At what distance along the axis of a charged disk is the electric field strength double its value at the center of the disk? Give your answer in terms of the disk's radius R.
3 ) At what distance along the axis of a charged square is the electric field strength double its value at the center of the square? Give your answer in terms of the square's side R.
4 ) At what distance along the axis of a charged square is the electric field strength half its value at the center of the square? Give your answer in terms of the square's side R.
To know more about Electric field
https://brainly.com/question/8971780
#SPJ4
My observation is that no object on planet Earth will keep going in one direction forever and never slow down. Because of friction, and air resistance, objects will eventually slow down (from free fall or motion).
Newton's first law (Law of Inertia) states that all objects in motion will stay in motion until acted upon by an outside force.
Can anyone give an example where an object on Earth follows Newton's first law?
An example where an object on Earth follows Newton's first law is a ball rolling on the ground.
What is Newton's first law of motion?
Newton's first law of motion states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Examples of Newton's first law of motion;
Brakes applied by a bus driver abruptlyAn object placed on a plane SurfaceA ball rolling on the ground.Thus, an example where an object on Earth follows Newton's first law is a ball rolling on the ground.
Learn more about Newton's first law of motion here: https://brainly.com/question/10454047
#SPJ1
Which word describes something that can cause harm? A hazard, A risk, A warning or A precaution
Answer:
Hazard
Explanation:
A hazard is a source or a situation with the potential for harm in terms of human injury or ill-health, damage to property, damage to the environment, or a combination of these.
An object undergoes simple harmonic motion with time period of 2s and amplitude 0.5m. at time t=0 the displacement if the object is a maximum. what is the displacement of the object from the equilibrium position at t=1.5s?
When t is 1.5 seconds displacement of the object is 0.41 m.
Displacement of an object is defined as the shortest path covered by an object. It can be represented in the units centimeters and meters.
The object's time of simple harmonic motion is T.
T = 2 seconds
The object's amplitude simple harmonic motion is a.
a = 0.5 m
Displacement of the object is maximum when t = 0.
The displacement of the object is y.
When t is 1.5 seconds displacement of the object is,
[tex]y = a \: sin( \frac{2\pi}{T} )t[/tex]
[tex]y = 0.5\: sin( \frac{2\pi}{2} ) \times 1.5[/tex]
[tex]y = a \: sin( \pi \: 1.5)[/tex]
y = 0.41 m
Therefore, when t is 1.5 seconds displacement of the object is 0.41 m.
To know more about displacement, refer to the below link:
https://brainly.com/question/16886780
#SPJ4
What is the peak current through a 484 w room heater that operates on 110 v ac power?
Through a 484-w room heater that operates on 110 v ac power, the peak current would be 6.22A
Concept of Peak current:The maximum amount of current that an output is capable of sourcing for brief periods of time is known as the peak current.
When an electrical device or power supply is turned on for the first time, a large initial current known as the peak current flows into the load, starting at zero and increasing until it reaches a peak value.
What is the peak current or the RMS currentPeak current is the highest current present at any particular moment. On the other side, RMS currents are the average currents.
CalculationIo =?
Power = Vrms x Irms = 484
⇒ 484 = 110v x Io/ [tex]\sqrt{2}[/tex]
Io = (484 x [tex]\sqrt{2}[/tex]) / 110
Io = 6.22A
Thus, the peak current is 6.22A
To know more about peak current, visit:
https://brainly.com/question/28169133
#SPJ4
what minimum heat is needed to bring 50 g of water at 50 ∘c to the boiling point and completely boil it away? the specific heat of water is 4190 j/(kg⋅k) and its heat of vaporization is 22.6 × 10 5 j/kg .
The minimum heat required is 129.7KJ.
How to find the minimum heat?Given
Mass of water (m) = 50g
Initial temperature [tex]T_{i}[/tex] = 20°C
Final temperature [tex]T_{f}[/tex] = 100°C
Specific heat of water =4190 J/kg-k
The heat of vaporization (L) = 22.6 × 10 5 j/kg .
The heat required = Heat required to raise water temperature from 20 to 100 + Heat to vapourize water thoroughly.
Q=mc([tex]T_{f} - T_{i}[/tex]) + mL
Q=0.05 * 4190 (100-20) + 0.05 * 22.6 × [tex]10^{5}[/tex]
Q=(0.16760 + 1.13)× [tex]10^{5}[/tex]
Q=1.2976 × [tex]10^{5}[/tex]
= 129.7KJ
To learn more about heat, refer
https://brainly.com/question/21927103
#SPJ4
A boiling tube containing liquid stearic acid which has a melting point of 69°C is placed into an insulated cup of water as the stearic acid solidifies the temperature of the water rises explain why (3marks)
The observation is due to heat transfer from the stearic acid to the water, and as a result, the temperature of the stearic acid falls, and it solidifies whereas the temperature of the water rises.
What is heat transfer?Heat transfer is the process by which heat energy moves from one body or object to another.
Heat is transferred from a hotter to a colder object.
There are three major processes of heat transfer, they are:
conductionconvection, and radiationConduction is a for of heat transfer which occurs without actual movement of the molecules, but as result of the vibration of the particles thereby transferring energy from one molecule or particle to the next.
Considering the observation above:
A boiling tube containing liquid stearic acid which has a melting point of 69°C is placed into an insulated cup of water as the stearic acid solidifies the temperature of the water rises.
The given observation is because heat has been transferred from the stearic acid to water. Thus, the temperature of the stearic acid falls, and it solidifies whereas the temperature of the water rises.
Learn more about heat transfer at: https://brainly.com/question/16055406
#SPJ1
What is the answer to this problem .
A,B,C or D ?
Option B, the fact that the rubber band is made up of elastic material ensures that it possesses mechanical energy as mechanical energy is stored in the form of kinetic and potential energy.
What is mechanical energy?Mechanical energy is one form of energy in which the total energy is conserved in the form of kinetic and potential energy. In mechanical energy kinetic energy changes into potential energy and vice-versa.
What is an elastic material?Elastic materials are types of materials that get back to their original shape after getting stretched by an external force. For example, rubber is an elastic material because it is stretched when force is applied to it but returns to its original shape once the forces are removed.
Now in the given question we have been asked why rubber band has mechanical energy.
The first option states because of mass but since the meaning of mass does not insure that it is only mechanical energy it could also be electrostatic energy or any other form of energy.
Option B talks about the elastic nature of rubber band which is a correct answer to the question.
Elastic nature of the rubber band ensures that the total energy remains conserved in the form of mechanical energy.
In rubber band when it is stretched in the stressed position it stores energy in the form of potential energy.
While it is released from stretched position the energy gets converted into kinetic energy therefore conserving the total mechanical energy.
Therefore option B which states that the mechanical energy of the rubber band exist because of elastic nature of the material of the rubber band is the correct option.
Learn more about mechanical energy here:
https://brainly.com/question/13552918
#SPJ9
Why does 10 gram bigger cooper than 10 gold
Answer: A gram of gold is worth about $25, so 2 grams or better would be viewed as high-grade for bulk tonnage mining.
Explanation:
i looked it up.
What is the transformed numeric value for employment length (emp_length) for those working more than 10 years?
The possible values lie between 0 to 10. The transformed numeric value can be 10.
Why are numerical features transformed?The skewed features need to be transformed in order to make them regularly distributed. With square root, cube root, and logarithm transformation, right-skewed features can be made normal.
How may Excel be used to turn non-numeric data into numeric data?Choose the cells that have text-based numbers recorded in them. Then Click Paste > Paste Special on the Home tab. After selecting Multiply, select OK.
Excel multiplies each cell by 1, converting the text to numbers in the process.
To know more about transformed numeric value visit:
https://brainly.com/question/27614472
#SPJ4
electrons, like all other matter, exhibit the dual behavior of both particles and waves. since electrons travel like waves, their energy is restricted to certain energy , each of which is associated with a specific wavelength
Electrons, like all other matter, exhibit the dual behavior of both particles and waves. Since electrons travel like waves, their energy is restricted to a certain energy level, each of which is associated with a specific wavelength.
Wave-particle Duality:Wave-particle duality is the idea that matter and energy have characteristics that are typical of both waves and particles. Depending on the circumstances, the matter may be seen as a wave or a particle.
Objects with huge masses, like baseball, have such small wavelengths that they are best regarded as particles. On the other hand, objects with small masses, like photons, have huge wavelengths and are best regarded as waves. However, objects with intermediate masses, like electrons, have characteristics of both particles and waves.
As a result, in 1924 de Broglie hypothesized that a particle like an electron may be characterized by a wave. Since electrons are waves, their energy is limited to specific energy levels, each of which corresponds to a given wavelength which is given by
[tex]\lambda =\dfrac{h}{mv}[/tex]
Where h ⇒Planck’s constant,
m ⇒ mass of the particle
v ⇒ velocity of the particle
Read more about Wave-particle Duality:
https://brainly.com/question/14270527
#SPJ4
Fill in the blank:
Electrons, like all other matter, exhibit the dual behavior of both and Since electrons travel like waves, their energy is restricted to a certain energy , each of which is associated with a specific wavelength.
An airplane was flying from Cincinnati to Denver. The velocity of an airplane was measured shortly after take off at 10km/min. The velocity was measured again midflight (at its fastest) 18km/min. 90 min passed between the 2 velocity measurements. What is the acceleration of the airplane?
720 km/min2
0.3 km/min2
2 km/min2
0.9 km/min2
The acceleration of an airplane that had an initial velocity of 10km/min and a final velocity of 18km/min covered over 90min is 0.09km/min².
How to calculate acceleration?The acceleration of a moving substance can be calculated by dividing the change in velocity by the time taken as follows:
a = (v - u)/t
Where;
a = accelerationv = final velocity (km/min)u = initial velocity (km/min)t = time (minutes)According to this question, an airplane was flying from Cincinnati to Denver. The velocity of an airplane was measured shortly after take off at 10km/min. The velocity was measured again mid-flight to be 18km/min.
a = (18km/min - 10km/min)/90min
a = 8km/min ÷ 90min
a = 0.09km/min²
Therefore, acceleration of an airplane that had an initial velocity of 10km/min and a final velocity of 18km/min covered over 90min is 0.09km/min².
Learn more about acceleration at: https://brainly.com/question/12550364
#SPJ1
2. the microscope is an instrument of measurement. measure the size of an object that fills ½ of the field of view under high power, 400x. show your math.
The size of the object is 200 micrometers.
Size of the object = (Diameter of the field of view) / Fit number
Field of view of high power magnification 400X = 0.40mm
Fit number = 2 (object fills ½ of the field of view )
Size of the object = 0.40 / 2 = 0.2mm = 200 micrometer.
Work is completed at a rate determined by power. The Watt is the common metric unit of power. A unit of power is adequate for one unit of work divided by one unit of time, as suggested by the facility equation. As a result, one Watt is adequate for one Joule/second. The term "horsepower" is occasionally wont to describe a machine's output of power for historical reasons. The equivalence of horsepower is roughly 750 Watts. a person is a machine, a bit like a machine with a power rating. Some people possess greater strength than others. In other words, some people have the power to accomplish the same amount of work in the same amount of time or in less time.
To learn more about power click on this link:
brainly.com/question/2289248
#SPJ4
a wooden block floats a liquid with 1/4 of it's volume above the liquid.find the density of the liquid given that the density of the wood is 900 gm–³
675g/cm³ is the density of the liquid
Here we have given that
density of wood be ρ.
the volume of the block be V
The volume of the block =1/4 v
The volume of the immersed block (v) =V-1/4V=3/4V
We know the weight of the block = the weight of the water displaced by the submerged part of the block.
i.e. V x ρ x g
= 3/4 x900g/cm³
= 675g/cm³
Density is a measure of mass divided by the volume of an object. Defined as mass per unit volume. here from the above equation we have substituted the given value and we got the answer as 675g/cm³
Learn more about Density here https://brainly.com/question/1354972
#SPJ9
6. A rock is dropped from a cliff and takes 6 seconds to hit the ground. At what time is the
speed of the rock the highest?
Answer:
Acceleration due to gravity = g = 9.8 m/s²
Time to reach ground = t = 6 sec
Initial Velocity of the Rock = Vi = 0 m/s (Because, the rock will be at rest, initially)
Hope this answer helps you out!
Pure water has a density of 1000 kg/m³. Explain what will
happen to a block of material with a density of 1020 kg/m³
when placed into:
sea water
pure water.
The block of material with a density of 1020 kg/m³ when placed into pure water will sink.
What is the density of an object?The Density of an object is the ratio of the mass and volume of the object.
density = mass/ volumeThe density of an object measure how compact the particles of an object are.
Dense objects have particles that are tightly packed together whereas less dense objects have particles that are less tightly packed together.
A denser solid will sink in a less dense liquid.
A less dense solid will float in a denser liquid,
Comparing the densities of the solid object and the density of water.
The block of material has a greater density than water. Hence, the block of material will sink in water.
Learn more about density at: https://brainly.com/question/1354972
#SPJ1
100 POINTS Consider a balloon of mass 0.030kg being inflated with a gas of density 0.54kg/m. What will be the volume of the balloon when it just begins to rise in the air of density 1.29kg/m3. (g=10m/s2) Detailed Explanation Please
Answer: Volume=0.030/0.75
Explanation:
Density= mass/volume ∆density= mass/volume
(1.29- 0.54)= 0.030/volume
0.75 volume= 0.030 Volume=0.030/0.75
Polar latitudes have a solar radiation deficit.
Answer: TRUE
Explanation:
A student fires a cannonball vertically upwards with a speed of 34.0m/s. On the descent, the cannonball lands on top of a 30.0m tall building. Determine all unknowns and answer the following questions.
What was the cannonball's maximum height (measured from the ground)?
With what speed did the cannonball strike the building?
What was the cannonball's total flight time?
Using the equations of kinematics, we obtain the following results;
Maximum height of the cannonball = 59 mVelocity with which the ball strikes the building = 24 m/sTotal time of flight of the cannonball = 7 secsWhat is the maximum height?The maximum height is the height that was attained by the projectile. In this case, we have the fact that the projectile was fired vertically upwards with a speed of 34.0m/s. On the descent, the cannonball lands on top of a 30.0m tall building.
1) The maximum height could be obtained from;
v^2 = u^2 -2gh
v = final velocity ( 0 m/s at the maximum height)
u = initial velocity = 34.0m/s
g = acceleration due to gravity = 9.8 m/s^2
h = maximum height attained
Since v = 0 m/s
u^2 = 2gh
h = u^2/2g
h = (34)^2/ 2 * 9.8
h = 1156/19.6
h = 59 m
2) Given that the distance covered from the maximum height to the top of the building = 59 m - 30 m = 29 m
v^2 = u^2 + 2gh
In this case, the initial velocity is zero because the cannonballs dropped from a height
v^2 = 2gh
v = √2gh
v = √2 * 9.8 * 29
v = 24 m/s
Given that;
v = u - gt
v = 0 m/s when the cannon ball is projected upwards;
u = gt
t = u/g
t = 34.0m/s/9.8 m/s^2
t = 3.5 secs
The total time spent in air = 2(3.5 secs) = 7 secs
Learn more about kinematics:https://brainly.com/question/7590442
#SPJ1
A control is the___by which test___ can be compared.
A control is the standard by which test variables can be compared.
What is an experiment?An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.
In an experiment, controlling an experiment means designing an experiment so that the effects of one or more variables are reduced or eliminated.
A control is a separate group or subject in an experiment against which the results are compared.
Therefore, it can be said that a control is the standard by which test variables can be compared.
Learn more about control at: https://brainly.com/question/4444046
#SPJ1