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3 years ago

Resistance is a force that __________.

Physics

2 answers:

alexira [117]3 years ago

7 0

Answer:

1. option (b)

2. option (a)

Explanation:

1. Resistance is the force which tries to slow down the speed of moving body.

For example, if a ball is kicked, then after some time the speed of the ball goes on decreasing and then finally comes to rest. it is due to the resistance force of floor and the surface of ball.

2. It is called balance.

Staying upright due to some vigorous activities is due to the balance of the body.

Maslowich3 years ago

7 0

Answer:

<h2><u><em>B. slows objects down</em></u></h2>

Explanation:

i take test

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antoniya [11.8K]

The initial velocity of the skier is 4.5 m/s

Explanation:

There is only one force acting on the skier in the horizontal direction, and it is the force of friction, whose magnitude is

$F_f = -\mu_k mg$

where

$\mu_k = 0.050$ is the coefficient of kinetic friction

m is the mass of the skier

$g=9.8 m/s^2$ is the acceleration of gravity

The negative sign is due to the fact that the direction of the force of friction is opposite to the direction of motion of the skier.

According to Newton's second law, the net force acting on the skier is equal to the product between his mass and his acceleration, so we can write:

$F=ma\\ \rightarrow -\mu_k mg = ma$

So, the acceleration of the skier is

$a=-\mu_k g$

Now we can apply the following suvat equation to find the initial velocity of the skier:

$v^2-u^2=2as$

where

v = 0 is the final velocity (he comes to a stop)

u is the initial velocity

s = 21 m is the displacement

a is the acceleration

Substituting the equation for the acceleration and solving for u, we find

$u=\sqrt{v^2-2as}=\sqrt{-2(-\mu_k g) s}=\sqrt{2(0.050)(9.8)(21)}=4.5 m/s$

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3 years ago

Name a device that converts mechanical energy into electrical energy.

erma4kov [3.2K]

Answer:

Electric generator is the device that converts mechanical energy into electrical energy

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What happens to mechanical energy if the potential energy of an object decreases?

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D. Mechanical energy remains unchanged.

Mechanical energy = Potential energy + Kinetic energy

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5. A 5.0 kg object accelerates uniformly from rest for 5.0 s and reaches a final velocity of 20.0 m/s. At 3.0 s, what is the obj

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Answer:

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4 years ago

An unknown number of identical light bulbs are connected to a 15 V battery in parallel. The current through the battery is 2 A.

zaharov [31]

Answer:

An unknown number of identical light bulbs are connected to a 15 V battery in parallel. The current through the battery is 2 A. If the light bulbs are connected to the battery in series, the current through the battery is 5 mA. How many bulbs are there?

3 bulbs are there from the analogy given above

Explanation:

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