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4 years ago

What is the explanation for this

Physics

1 answer:

Vladimir [108]4 years ago

5 0

Answer:

Opposite to the net force

Explanation:

The frictional force is a constant force that resists the motion of a body.

There are two classifications of frictional force

1) Static friction

2) Kinetic friction

When a force acts on two surfaces that prevent the sliding between them is the static frictional force.

When a force acts on a moving surface that opposes the motion of the surface is called the kinetic friction.

The kinetic frictional force acts in the direction opposite to the motion and the net force.

The static and kinetic frictions are dimensionally the same quantity only the coefficient of the friction is higher for static friction.

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I drop an egg from a certain distance and it takes the egg 3.74 seconds to reach the ground. How high up was the egg?

Slav-nsk [51]

Answer:

The height from which the egg is dropped is 68.54 m.

Explanation:

Given:

Initial velocity of egg is, $u=0\ m/s$ (Dropped means initial velocity is 0)

Time taken is, $t=3.74\ s$

Acceleration experienced by egg is due to gravity, $a=g=9.8\ m/s^2$

The height from which the egg is dropped is, $d=?$

Now, we use Newton's equation of motion that relates the distance, initial velocity, time and acceleration.

So, we have the following equation of motion:

$d=ut+\frac{1}{2}at^2$

Plug in all the given values and solve for 'd'. This gives,

$d=0+\frac{1}{2}\times 9.8\times (3.74)^2\\\\d=\frac{1\times 9.8\times 13.9876}{2}\\\\d=\frac{137.078}{2}\\\\d=68.54\ m$

Therefore, the height from which the egg is dropped is 68.54 m.

8 0

3 years ago

A. 2kg B. 6kg C. 8kg D. 14kg

Sati [7]

Answer:

Explanation:

We know the force is (16N-12), which is 4N, and we know the acceleration is 2 m/s^2. Meaning, we can solve the formula m = F / a (mass equals force divided by acceleration), and we get 2kg.

7 0

3 years ago

what kind of wave would be observed in outer space between planets where there is very little matter?

ddd [48]

Shock waves can be observed in outer space between planets where there is very little matter. Although little, plasma does exist in outer space which allows the waves to travel.

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3 years ago

If you place small pieces of tissue paper near the balloon in Picture 2, they would probably stick to the

pishuonlain [190]

Answer:

The balloon has more negative charges than positive charges. The tissue paper has a neutral charge.The static electricity pulls on the tissue paper lifting it up.

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3 years ago

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jekas [21]

Answer:

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