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3 years ago

Which would BEST describes what occurs when a ball is thrown against a wall?

2 answers:

4 0

When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal force in the opposite direction back on the ball. (D)

scoundrel [369]3 years ago

4 0

Answer:

The ball exerts a force on the wall and the wall exerts a force back.

Explanation:

When a ball is thrown against a wall, the ball exerts a force on the wall and the wall exerts a force back. This is due to Newton's third law of motion. According to this law, every action have equal and opposite reaction and both action and reaction forces acts on different object.

In this case, when a ball is thrown against a wall, the wall exerts an equal force on the the ball but in opposite direction. It follows the newton's third law.

Hence, the correct option is (D).

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In short-track speed skating, the track has straight sections and semi-circles 16 m in diameter. Assume that a 66 kg skater goes

kotykmax [81]

Answer:

a. 1,188 N

b. 1.836

Explanation:

The computation is shown below:

a. For horizontal force, first we need to find out the circular path radius which is shown below:

As we know that

$r = \frac{d}{2}$

$= \frac{16}{2}$

= 8m

Now the horizontal force is

$F = \frac{m\times v^2}{r}$

where,

m = 66 kg

v = 12 m/s

and r = 8 m

Now placing these values to the above formula

So, the horizontal force is

$F = \frac{66\times 12^2}{8}$

= 1,188 N

b. Now the ratio of force to the weight of skater is

$= \frac{1,188 N}{66\ kg \times 9.8m/s^{2}}$

= 1.836

3 0

3 years ago

Explain your problem of Federalism

telo118 [61]

That is more of a History of English question.

6 0

3 years ago

A natural atom can be negatively charged by

svet-max [94.6K]

Answer:

By Gaining Electrons

Explanation:

A nuetral atom is negative when it gains electrons, and it can be positive when it loses electrons.

4 0

3 years ago

Read 2 more answers

A student performs a reaction twice. In the second trial, she raises the temperature by 20¨¬C and notices that the reaction take

Lerok [7]

Answer: She is incorrect to conclude that the reaction is endothermic.

As in the second trial, the temperature has increased by 20 °C , that means the heat has been released and energy is released in exothermic reactions.

Exothermic reactions: The reactions in which the energy of the products is less than the energy of the reactants, and the excess energy is released as heat.

Endothermic reactions: The reactions in which the energy of the products is more than the energy of the reactants, and the excess energy is absorbed as heat.

3 0

3 years ago

Read 2 more answers

An 85.0-N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 28.0°

irina [24]

Answer:

A 75.1 N and a direction of 152° to the vertical.

B 85.0 N at 0° to the vertical.

Explanation:

A) The interaction partner of this normal force has what magnitude and direction?

The interaction partner of this normal force is the component of the weight of the crate perpendicular to the ramp. It has a magnitude of 85cos28° = 75.1 N and a direction of 180° - 28° = 152° to the vertical(since it is directed downwards perpendicular to the ramp).

B) The normal and frictional forces are perpendicular components of the contact force exerted on the crate by the ramp. What is the magnitude and direction of the contact force?

Since this force has to balance the weight of the crate, its magnitude is 85.0 N. Its direction has to be vertically opposite to that of the weight.

Since the weight is 180° to the vertical (since it is directed downwards), this force is 0° to the vertical.

So, this force has a magnitude of 85.0 N and a direction of 0° to the vertical.

8 0

3 years ago