A child is stationary on a swing. The child is given a push by his brother to start him swinging. His brother applies a steady force of 84 N over a distance of 0.25 m. Calculate the work done by this force.

Answers

Answer 1

Answer: The formula is M=Fd
so we have F=84N and d=0.25m
Now we just replace F and d into the formula M=84N×0.25m
And the last thing we do is calculate it
M=21Nm

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when was slate found

Answers

No direct answer, around the 1800s

What factors affect the speed of a wave?

Answers

Speed of wave depends mainly on four factors. These factors are wavelength, frequency, medium and temperature.

We know from laws of refraction, when a wave travels from rarer to denser medium, the speed of wave slows down. And when it travels from denser to rarer, it speeds up.

The relation of speed of wave with its wavelength and frequency is given by the following:

$v = \lambda * f$

The speed of a wave in a particular medium remains constant. A higher frequency wave has shorter wavelength.

The speed of a wave also varies with temperature in a given medium. temperature affects the density of the medium and vibrations of the medium particles. Higher the temperature, higher is the speed of wave.

The factors that affect the speed of a wave are wavelength and medium. The correct option is B.

Wavelength and the characteristics of the medium a wave travels through are the two key parameters that affect a wave's speed.

Wavelength is the separation between successive wavepoints, and medium is the substance or material through which the wave is travelling, such as air, water, or solids.

The speed of the wave typically decreases as the wavelength rises. Additionally, the densities, compositions, and properties of various media can vary, which has an impact on how quickly a wave can go through them.

For instance, sound waves move through the air more quickly than they do through water. In disciplines like physics, acoustics, and communications, having an understanding of these elements is essential.

Thus, the correct option is B.

For more details regarding wave, visit:

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Your question seems incomplete, the probable complete question is:

What factors affect the speed of a wave?

A) Amplitude and frequency

B) Wavelength and medium

C) Temperature and pressure

D) Velocity and direction

Which of the following is an example of a compound C2, O2, He2, CO2?

Answers

Carbon dioxide is an example of a compound (CO2)

CO2 and He2 is an example of a compound. Anything that has only one type of atom is a molecule, and anything having more than one type of atom is a compound.

What considerations are important in a well planned system for handling emergency situations

Answers

have a well thought out plan to begin with

Why AA batteries run exactly 1.5V?

Answers

They don't.

Just for you, I pulled seven (7) AA cells out of a fresh pack from the
store, taped them down to my desk, collected a few other things,
and made these measurements:

AA Cell Open at 25 mA Calc int R, Ω
   #1    1.596 1.546    3.285
   #2    1.601 1.551    3.285
   #3    1.598 1.539    3.876
   #4    1.578 1.548    1.971
   #5    1.600 1.539    4.008
   #6    1.598 1.526    4.730
   #7    1.600 1.547    3.482

The (open/unloaded) voltage of the cell is determined by
the cell's "chemistry" ... the actual chemicals and metals
it's constructed from ... that undergo the chemical reaction
to deliver current between the terminals when a conductor
is connected there.

-- The variation in voltage among these 7 cells is about 1.44% .

-- The variation in the internal resistance of these cells ... an
indication of how much current (amps) a cell can deliver ...
varies over a range of almost 140% . I am surprised.

We all run into a situation whenbatteries in our remotes, toys, keyboards/mice run out. If we don't know how tocheck a battery we might throw out a perfectly fine battery (especially when wehave a pile of them somewhere in the drawer).

This electronics tip has to deal with checking common alkaline AA/AAA batteriesor AA/AAA rechargeable batteries for proper voltage with a voltmeter.

Disclaimer : some people might say that a battery should always be tested underload but I have found that in most common household applications this isinsignificant and will not change the results of the testing too much.

A child is sledding. He starts at the top of the hill with a velocity of zero, and 3 seconds later he is speeding down the hill at 12 meters per second. What is the child's acceleration?

Answers

Magnitude of acceleration = (change of speed) / (time for the change) =

(12 m/s - 0) / (3 sec) =

12/3 = 4 m/s²

What's a challenge question ? Have we all passed the event horizon
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