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iris [78.8K]
3 years ago
10

A boston red sox baseball player catches a ball of mass m that is moving toward him with speed v. while bringing the ball to res

t, his hand moves back a distance
d. assuming constant deceleration, the horizontal force exerted on the ball by his hand is:
Physics
1 answer:
Anton [14]3 years ago
5 0
I think the answer Is inertia
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A horizontal force of magnitude 30.2 N pushes a block of mass 3.50 kg across a floor where the coefficient of kinetic friction i
marshall27 [118]

Answer:

A) 89.39 J

B) 30.39J

C) 23.8 J

Explanation:

We are given;

F = 30.2N

m = 3.5 kg

μ_k = 0.646

d = 2.96m

ΔEth (Block) = 35.2J

A) Work done by the applied force on the block-floor system is given as;

W = F•d

Thus, W = 30.2 x 2.96 = 89.39 J

B) Total thermal energy dissipated by the whole system which includes the floor and the block is given as;

ΔEth = μ_k•mgd

Thus, ΔEth = 0.646 x 3.5 x 9.8 x 2.96 = 65.59J

Now, we are given the thermal energy of the block which is ΔEth (Block) = 35.2J.

Thus,

ΔEth = ΔEth (Block) + ΔEth (floor)

Thus,

ΔEth (floor) = ΔEth - ΔEth (Block)

ΔEth (floor) = 65.59J - 35.2J = 30.39J

C) The total work done is considered as the sum of the thermal energy dissipated as heat and the kinetic energy of the block. Thus;

W = K + ΔEth

Therefore;

K = W - ΔEth

K = 89.39 - 65.59 = 23.8J

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2 years ago
What is universal laws of gravitation ​
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Answer:

Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Explanation:

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If a 40,000g cannon ball is 35m above the Earth's surface, how much potential energy does the cannon
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Answer: 21

Explanation:

because 9 + 10 = 21

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We can predict the path of a hurricane because of the work of which of the following scientists?
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Explanation:

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PLS HELP ME
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The answer is true...
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