Answer:
70.8m
Explanation:
Given parameters:
Time of fall = 3.8s
Unknown:
Depth of the mine = ?
Solution:
To solve this problem, we use the appropriate motion equation as shown below;
S = ut + [tex]\frac{1}{2}[/tex] at²
S is the depth
u is the initial velocity = 0m/s
t is the time taken
a is the acceleration due to gravity
Now insert the parameters and solve;
Since u = 0;
S = [tex]\frac{1}{2}[/tex] at² = [tex]\frac{1}{2}[/tex] x 9.8 x 3.8² = 70.8m
Electrical energy is widely used among the various sources of energy...Justify
Answer:
Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power.
Circle the correct word(s) in brackets to complete each sentence.
i) Hooke's Law works for ( springs only / all materials / some materials ).
ii) Hooke's Law only applies ( up to / over ) a certain force.
iii) The force at which Hooke's Law stops working for springs is
( higher / lower ) than
for most other materials?
Answer:
i) Hooke's Law works for some materials
ii) Hooke's Law only applies up to a certain force
iii) The force at which Hooke's Law stops working for springs is lower than for most materials
Explanation:
Hooke's Law of elasticity states that the deformation of an elastic material is proportional to the applied for small deformations
The law is applicable to elastic materials whose values of deformation or extension as well as the applied load or stress are expressible by a single real number
Hooke's Law is applicable when the force and the extension of the elastic material are proportional, at larger force, the elastic material is observed to expand more than as expected based on Hooke's Law
The nature of springs is such that its elastic limit is reached by a much lower force than for most materials. Therefore, Hooke's law stops working for springs at a lower force than for most materials.
What does the atomic number of an atom tell us?
How much the atom weighs
The number of protons in the atom
Which column the element is in on the periodic table
The number of electrons it is likely to lose
Answer:
the number of protons in the atom.
Explanation:
Answer:
the number of protons in the atom
Explanation:
Willing to give out Brainliest: 3.00 m^3 of water is at 20.0°C If you raise its temperature to 60.0°C, by how much will its volume expand ?
Answer:
The answer is below
Explanation:
Charlee's law states that the volume of a gas is directly proportion to the temperature of the gas at constant pressure. That is:
V = kT, where V = volume and T = temperature, k = constant. Therefore:
V / T = k
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
Given that: [tex]V_1=3\ m^3, T_1=20^oC=(20 + 273)K=293\ k,T_2=60^oC=(60 + 273)K=333\ k.\\\\\frac{V_1}{T_1}=\frac{V_2}{T_2}\\\\\frac{3}{293}=\frac{V_2}{333} \\\\V_2=\frac{3}{293}*333\\\\V_2=3.41\ m^3\\[/tex]
The new volume is 3.41 m³. That is it expands by 0.41 m³
Answer:
0.02484
Explanation:
Trust me bro
why do compass needles around a current carrying wire point in different directions
Answer: because of the magnetic
Explanation: If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
A cyclist travels 1850 m north and then 1200 m south. Find both the distance it has traveled and the magnitude of its displacement.
Answer:
The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.
Explanation:
Distance refers to the length between any two points in space, while displacement refers to the distance from a start position to an end position regardless of the path.
In other words, distance refers to how much space an object travels during its movement; is the quantity moved. It is also said to be the sum of the distances traveled. The distance traveled by a mobile is the length of its trajectory and it is a scalar quantity. In this case, the distance is calculated as:
1850 m + 1200 m= 3,050 m
Displacement refers to the distance and direction of the final position from the initial position of an object. The displacement effected is a vector quantity. The vector representing the displacement has its origin in the initial position, its end in the final position, and its module is the distance in a straight line between the initial and final positions. That is, when expressing the displacement it is done in terms of the magnitude with its respective unit of measurement and the direction because the displacement is a vector type quantity. Mathematically, the displacement (Δd) is calculated as:
Δd= df - di
where df is the final position and di is the initial position of the object.
In this case, the displacement is calculated as:
1850 m - 1200 m= 650 m
Since the distance to the north is greater, the direction of travel will be to the north.
The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.
In a nuclear station if the temperature of the superheated water starts to decrease what should the engineer in charge of the reactor do?
Answer:
They sh0uld g0 t0 the reactor and then, see what the issue is...
Explanation:
then, see if they can fix the problem, im sorry if its wr0ng.
how does the eye control the amount of light entering it?
Answer:
Dilating the pupils.
Answer:
the retina of the eye contains photoreceptor cells that detect the light intensity, whether it is dim or bright, changing shape of iris.
Explanation:
in dim light, the receptors detect the light intensity, and in order to allow us to see more clearly, the radial muscles in iris contract, making the pupil widen(dilate), so more light enters eye.
in case of bright light, he receptors detect the light intensity, and in order to allow us to see more clearly, the circular muscles in iris contract, making the pupil narrow(constrict), so less light enters eye
An object of mass 8kg is attached to massless string of length 2m and swum with a tangential velocity of 3 what is the tension on the string
Answer:
36 N
Explanation:
If the object of mass, m = 8 kg is swung in a horizontal circle of radius, r = 2m = length of string with tangential velocity v = 3 m/s, the tension in the string is the centripetal force which is T = mv²/r
= 8 kg × (3 m/s)²/2 m
= 4 kg × 9 m/s²
= 36 N
explain why in the construction of a lightning conductor one end is made into a sharp point
Answer:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
Explanation:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
What happens when a soccer player commits a foul ?
a - the opposite team gets a throw in the ball
b - the opposite team gets a free kick
c - the opposite team gets a point
Answer:
b - the opposite team gets a free kick
Explanation:
i hang a 15 cm length spring in the classroom. the spring has a spring constant of 99 N/m. i the. attach a mass of 439 g to the spring. based on the information provided, use hookes law to predict the new length of the spring. (answer in cm)
Answer: 0.19 m
Explanation:
Spring constant (k) = 99 N/m
Length of spring hung = 15cm = 0.15m
Mass attached to the spring = 498g
The new length of spring :
F = kdx
F = mass (m) * acceleration due to gravity (g)
g = 9.8 m/s²
dx = L2 - L1 (Change in length)
m = 439 / 1000 = 0.439kg
L2 = new length
L1 = initial length
mg = k(L2 - L1)
0.439 * 9.8 = 99(L2 - 0.15)
4.3022 = 99(L2 - 0.15)
4.3022 = 99L2 - 14.85
4.3022 + 14.85 = 99L2
19.1522 = 99L2
L2 = 19.1522 / 99
L2 = 0.1934565
L2 = 0.19 m
New length of spring = 0.19 m
20 points please helppp me I’m begging u this is due soon please come on ????? Anyone
Answer:
Gases are element .We can change the state of matter by the process of melting,evaporation,sublimation,freezing,condensation.
How are points made in soccer ?
a- by kicking the ball into the goal net
b - by carrying the ball into end zone
c - by shooting the ball into the hoop
Answer:
a- By kicking the ball into the goal net
Explanation:
You cant pick the ball up so b is not the answer and there is no hoop so c is also not the answer. The answer is A
A 2.25kg solid sphere has a rotational inertia about its center
• of gravity of 1.52kg.m2. What is the radius of the sphere?
Answer:
r = 1.3m
Explanation:
The moment of inertia of a solid sphere can be expressed using the formula;
I = ⅖ mr²
Where;
I = moment (kgm²)
m = mass of the sphere (kg)
r = rotational radius of the sphere (m)
Based on the provided information in this question, I = 1.52 kgm², m = 2.25 kg, r = ?
1.52 = ⅖ × 2.25 × r²
1.52 = 0.4 × 2.25 × r²
1.52 = 0.9 × r²
1.52 = 0.9r²
r² = 1.52/0.9
r² = 1.688
r² = 1.69
r = √1.69
r = 1.3m
A body initially moving with a speed of 20m/s covers a distance of 150m after 5 sec .What is the acceleration of the body?
Answer:
a=4m/s2
Explanation:
Vi= 20m/s
S=150 m
t= 5 sec
a=?
using 2nd equation of motion;
S= Vit+0.5at^{2}
putting values
150= (20)(5)+0.5(a)([tex]5^{2}[/tex])
150-100= 12.5a
50/12.5 =a
4m/s2=a
9. A soft drink distibutor drove west 11 km from Minnehaha to Nut Plains. She then turned around and drove back east for 209 km to Dover
What distance did the soft drink dibutor travel
Distance
Answer:
220km
Explanation:
Given parameters:
Distance traveled from Minnehaha to Nut Plains = 11km
Distance traveled to Dover = 209km
Unknown:
The distance the soft drink distributor traveled = ?
Solution:
To solve this problem, we must understand that distance is the total length of path covered in a journey.
So;
Distance = 209km + 11km = 220km
The soft drink distributor covered 220km
The action of large, massive sections of a glacier break off and falling into the ocean is called ____________.
Group of answer choices
an iceberg
an ice sheet
calving
If I start with an 30 gram sample of Plutonium-244, how many grams would be left of Plutonium-244 after 1 half life
Answer:
15 g
Explanation:
Given,
Plutonium-244 = 30 g
We have to find the gram of Plutonium-244 left after 1 half-life.
We know that the half-life of a radioactive isotope is constant. The half-life of a Radioactive isotope does not depend on the initial amount of isotope.
Now,
After 1 half-life
Plutonium-244 left = [tex]\dfrac{30}{2}[/tex]
= 15 g
Hence, 15 g of the Plutonium-244 will be left after 1 half-life.
Through which gas in the table do sound waves travel at the slowest speed?
Air (dry)/Ammonia/Methane/Nitrous oxide
Speed of sound (m/s) 346/ 415/ 450/ 263
A. Ammonia
B. Nitrous oxide
C. Air
D. Methane
Answer: the answer would be methane if the problem is asking for the fastest
Explanation:
Methane (CH₄) is a chemical compound and a primary component of natural gas. The gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.
Methane is formed through various natural processes, including the decay of organic matter in anaerobic (oxygen-deprived) environments such as wetlands, landfills, and the digestive systems of animals.
The speed of sound in a gas depends on factors such as the density and elastic properties of the gas. The molecular composition and temperature of the gas can also affect the speed of sound. In this case, the properties of methane result in a slower speed of sound compared to the other gases mentioned.
Therefore, the gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.
For more details regarding methane gas, visit:
https://brainly.com/question/12645635
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The question is in the photo.
Answer:
Mitochondria (animal) and Chloroplast (plant)
a body is thrown vertically upward from the earth's surface and it took 8 seconds to return to its original position . find out the initial velocity with which it was thrown up
Answer:
The initial velocity with which the body was thrown up is 39.2 m/s
Explanation:
The given parameters for the body are;
The time it takes the body to return back to its initial position = 8 seconds
To answer the question, we make use of the kinematic equation of motion, v = u - g·t
Where
v = The final velocity of the body = 0 m/s at the maximum height
u = The initial velocity
g = The acceleration due to gravity = 9.8 m/s²
t = The time in which the body spends in the air
Therefore, at maximum height, we have;
v = 0 = u - g·t
u = g·t
t = u/g
From h = 1/2gt², which gives t = √(2·h/g), the time the body takes to maximum height = The time the body takes to return to its original position from maximum height.
Therefore, the total time in which the body is in the air = 2 × t = 2× u/g
∴
The total time in which the body is in the air = The time it takes the body to return back to its initial position after being thrown = 2 × t = 8 seconds
∴ 2 × t = 8 s = 2 × u/g
8 s = 2 × u/g
u = (8 s × g)/2
∴ u = (8 s × 9.8 m/s²)/2 = 39.2 m/s
The initial velocity with which the body was thrown up = u = 39.2 m/s.
Susie blows up a balloon. First, she places the balloon in a bucket of ice water. She observes the balloon. She then removes the balloon and places it into a bucket of hot water. She observes the balloon again.
1. Explain what Susie will observes when she puts the balloon in ice water.
2. Explain what Susie will observe when she puts the balloon in hot water.
1. When Susie puts the balloon in ice water, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, she will observe the expansion of the balloon.
What is Charles's law of gas?According to Charles' law, assuming the pressure is constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. French physicist J.-A.-C. Charles initially proposed this empirical relationship.
1. When Susie puts the balloon in ice water, the temperature of the gas inside the balloon will decreases and according to Charles' law its volume also decreases. That's why, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, the temperature of the gas inside the balloon will increases and according to Charles' law its volume also increases. That's why, she will observe the expansion of the balloon.
Learn more about Charles's law here:
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ten point on important of sports and games in human life
...
please halp
Please answer the following 3 questions with a 1 paragraph response:
Why is defense important in the game of basketball? What two ways can you play defense in basketball? What are the differences between the 2 different ways you can choose to play defense?
The two basic defenses in basketball are man-to-man, sometimes referred to as person-to-person in respect for the rise of women's basketball, and zone. Each basic defense has a number of variations.
2. Because it can take one year to form just a few centimeters of new soil, 3 points
it is important to protect Earth's soil. *
True
False
Answer:
False.
Explanation:
how can we take advantage of waste materials
Answer:
we can incinerate waste materials and use the product as fuel rather than dumping them. It may produce carbon dioxide but we can create a machine that can convert carbon into energy.
What is included in the units of Velocity that make it different from speed?What is included in the units of Velocity that make it different from speed?
Answer:
Direction
Explanation:
Speed is a measure of the distance covered by a moving object relative to the time it takes. It is a scalar quantity and, hence, measured irrespective of the direction the object is moving.
Velocity, on the other hand, is the speed of a moving object in a particular direction. It is a vector quantity, meaning that the direction of the moving object is important.
Therefore, the difference in the unit of speed and velocity is direction. The direction must be included in the unit of velocity.
please help me I need to get this right
HELP ASAP please.
Determine if each picture is a high or low tide.
Note: only ONE picture can be a high tide and only ONE picture can be a low tide!
Answer:
1st one low tide 2nd high tide