A vector has a magnitude of 20
meters due east and a second vector
has a magnitude of 20 meters due
west. What is the resultant of these
two vectors?

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

Ship A with a greater angle of projection will hit the target first.

The time of flight is the time a projectile takes to reach maximum height and return to the plane of projection. The time of flight is just double the maximum-height time.

Mathematically, time of flight is given as;

T = (2usinθ)/g

where;

The time of flight depends on initial velocity of the object and angle of projection.

When the initial velocity of both ships is the same and angle of projection varies, the difference in the time of flight will depend greatly on the angle of projection.

Thus, ship A with a greater angle of projection will hit the target first.

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Answer:

1.11111 century mother duck

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.

Answer:

See below

Explanation:

d = 1/2 a t^2

1.226 = 1/2 a (.5)^2

a = 1.226/(1/2 * .5^2)

a = 9.808 m/s^2

A researcher tests acceleration due to gravity then the acceleration due to gravity measured by the researcher is 9.808 m/s².

In mechanics, acceleration refers to the speed at which an object's velocity varies over time. how many accelerations each vector has. An object's acceleration is determined by the direction of the net force exerted on it.

Due to the fact that it has both a magnitude and a direction, acceleration is a vector quantity. Velocity is a different vector property.

According to the question,

Time, t = 0.5 seconds

Distance, s = 1.226 meters

s = 1/2 a t²

1.226 = 1/2 a (0.5)²

a = 1.226 / (1/2 *0.5²)

a = 9.808 m/s²

So, the acceleration due to gravity is 9.808 m/s².

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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.

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a) her speed is  26.43m/s

b)  Total distance traveled = 100 + 49.89

= 149.89m

c) Total time is 10.846 seconds

acceleration is the rate of change of the velocity of an object with respect to time.

From the question,

a) The car’s speed just after leaving the icy portion of the road is the first part

We have s = ut + 1/2at²

Here s = 100m, a = 1, u = 33.5 m/s

100 = 0* t + 1/2 * (-1) * t²

t = 7.07 seconds

After 7.07 seconds cars speed is given by v =u +at

u = 33.5m/s, a = -1

velocity = 33.5 + (-1) * 7.07 = 26.43m/s

So velocity of car on leaving icy surface = 26.43m/s

b) Time taken after icy surface

           0 = 26. 43 - 7 * t

            t = 3.776 seconds

 Distance traveled during this time

v² = u² + 2as

0 = (26.43)² + 2 * (-7) * S

s = 49.89 m

Total distance traveled = 100 + 49.89

= 149.89m

c) Total time taken = 3.776 + 7.07

Total time is 10.846 seconds

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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.

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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.

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.

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.

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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

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The true statement for sinusoidal wave travelling  along a light weight string =

lambda₂<  lambda₁  and f₂ = f₁

λ₂ ≤ λ₂

The sine or sinusoidal wave may be a curve that describes a smooth repetitive oscillation. we will define the sine wave as “The wave form in which the amplitude is always proportional to sine of its displacement angle at every point of time”. All waves are often made by adding up sine waves

Then the waveform shape produced by our simple single loop generator is usually referred to as a Sine Wave as it is said to be sinusoidal in its shape. this sort of waveform is called a sine wave because it is based on the trigonometric sine function used in mathematics.

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In the Modified Block letter style, the date, complimentary close, and signature block are positioned approximately one-half inch to the right of center or at the right margin.

Following the proper format while writing business letters is crucial. There are specific methods that business letters have to be written.

The modified block letter style, which places one space between the body of the letter and the addresses of the sender and recipient, is one of the several letter kinds. In this form of letter, one space corresponds to around half an inch to the right of centre or at the right margin. Modified block letter formats are largely the same as full-block business letters.

Modified block format is a different extensively used format. The letter body, along with the sender and recipient's addresses, are left justified and single-spaced in this format. On the other hand, tab to the centre and start typing for the date and closure. Semi-Block. Semi-block is the last and least popular type of style.

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The acceleration of Laura is 5.32 m/s² and that of Healen is 3.75 m/s².

Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.

A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI units (metric system) of metres per second (m/s or ms1). For example, "5 meters per second" is a scalar while "5 meters per second east" is a vector.

Maximum speed of Laura is [tex]\Delta_{t1} = 2s[/tex]

Maximum speed of Healen is [tex]\Delta_{t2} = 3s[/tex]

Each runs at a constant acceleration for a given time interval, giving,

[tex]\Delta x_a = \frac{1}{2} a\Delta t^2[/tex]

This reaches final velocity

⇒ [tex]v = a\Delta t[/tex]

⇒ [tex]\Delta x_v = v(T - \Delta t)[/tex]

⇒ [tex]\Delta x_v =a\Delta t(T - \Delta t)[/tex]

Each sprinter's acceleration is calculated as follows:

Laura :-

⇒ [tex]\Delta t_1 = 2s[/tex]

⇒ [tex]a_1 = \frac{100m}{18.8s^2}[/tex]

⇒ [tex]a_1[/tex] = 5.32 m/s²

Healen :-

⇒ [tex]\Delta t_2 = 3s[/tex]

⇒ [tex]a_2 = \frac{100m}{26.7s^2}[/tex]

⇒ [tex]a_2[/tex] = 3.75 m/s²

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Full question

In a women's 100 m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum speeds, which they each maintain for the rest of the race. They cross the finish line simultaneously, both setting a world record of 10.4 s.

A) What is the acceleration of each sprinter?

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:

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.

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;

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.

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The cheetah that can go from a state of resting to running at 20 m/s in just 2 seconds has an average acceleration of: 10 m/s²

The formulas for uniformly varied rectilinear motion (UVRM) and procedures we will use to solve this exercise are:

a = (vf - vi) /t

Where:

Information about the problem:

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (20 m/s - 0 m/s) /2 s

a = (20 m/s) /2 s

a =  10 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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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.

Answer: solid state

Explanation:

The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.

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

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The distance between you and the deer when you come to a stop is

s = d - 30 = 18 m.

The maximum speed you could have and still not hit the deer is

v = -5 + [tex]\sqrt{5}[/tex][tex]\sqrt{5 + 4d}[/tex]

  = 26m/s

You're driving down the highway late one night at 20m/s when a deer steps onto road d in front of you.

Your reaction time before stepping on the brakes is 0.50s and the maximum deceleration of your car is 10m/s2.

Given,

Speed = 20m/s

Time = 0.50 s

Distance = d

Deceleration = 10m/s2

D = R × T

D = Vi × Tr

D = (20 m/s) × (0.50 s)

D = 10 m

Dd = [ Vf^2 - Vi^2 ] / [ 2 × (-10 m/s^2) ]

Dd = [ (0.0 m/s)^2 - (20 m/s)^2 ] / (-20 m/s^2)

Dd = [ -400 m^2/s^2 ] / (-20 m/s^2)

Dd = 20 m

The total distance traveled is

Dt = D + Dd

Dt = (10 m) + (20 m)

Dt = 30 m

The distance between you and the deer when you come to a stop is

s = d - 30 = 18 m.

The maximum speed you could have and still not hit the deer is

v = -5 + [tex]\sqrt{5}[/tex][tex]\sqrt{5 + 4d}[/tex]

  = 26m/s

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Since an object's instantaneous velocity equals the derivative of its displacement at a certain point, we can also state that the instantaneous velocity at time t = 1 is around 2 meters per second.

The derivative of x with respect to t, or the upper limit of the average velocity as the elapsed time approaches 0, is the instantaneous velocity of an object:

v (t) equals d d t x (t). v (t) equals d d t x (t).

Instantaneous velocity is a vector having a dimension of length per time, similar to average velocity. The speed of an object at a specific time is its instantaneous speed. The instantaneous velocity is obtained by adding the direction to the speed.

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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

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Answer:The electrostatic force is directly related to the product of the charges and inversely related to the square of the separation distance.

Explanation:

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.

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A device that regulates how much engine power flows to a machine's moving parts, frequently made of connected sets of wheels with teeth around the edges. Hence, option C is correct.

A gear is a spinning, circular machine element with teeth that can be cut, or in the case of a cogwheel or gearwheel, they can be inserted. These teeth, known as cogs, mesh with another toothed part to transmit (convert) torque and speed. The fundamental idea underlying how gears work is comparable to the fundamental idea behind how levers work.  Cog is another casual term for gear. A power source's speed, torque, and direction can all be altered by geared devices.

So, the exact definition of gear is that gears are wheels with teeth.

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Answer:

Gears are wheels with teeth

The minimum heat required is 129.7KJ.

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

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Two oxygen atoms would share the negative charge.

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.

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Answer:

A hiker drops a heavy stone over a cliff and hear it strike the cliff base 2.8seconds after dropping it.

Answer:

John Dalton

Explanation:

Answer:

chemist John Dalton

Explanation:

:)