5. Work is being done when a force

Physics

2 answers:

PilotLPTM [1.2K]2 years ago

7 0

<h3>Questions:</h3>

Work is being done when a force

<h3>Answer:</h3>

When a force causes a displacement in an object, work is done. In order to compute the amount of effort, you'll need to know three things. Force, displacement, and the angle between force and displacement are the three quantities in question.

Artyom0805 [142]2 years ago

4 0

Answer:

work is done when a force is applied. the force must not be zero and should make the object move through a certain distance.

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STatiana [176]

the correct answers are 54N and -1,2m/s^2

6 0

3 years ago

Read 2 more answers

A 25 kg bear slides, from rest, 12 m down a lodgepole pine tree, moving with a speed of 5.6 m/s just before hitting the ground.

Anuta_ua [19.1K]

Answer:

(A) -2940 J

(B) 392 J

(C) 212.33 N

Explanation:

mass of bear (m) = 25 kg

height of the pole (h) = 12 m

speed (v) = 5.6 m/s

acceleration due to gravity (g) = 9.8 m/s

(A) change in gravitational potential energy (ΔU) = mg(height at the bottom- height at the top)

height at the bottom = 0

= 25 x 9.8 x (0-12) = -2940 J

(B) kinetic energy of the Bear (KE) = $0.5mv^{2}$

= $0.5 x 25 x 5.6^{2}$ = 392 J

change in KE (ΔKE) = initial KE - final KE
ΔKE = $0.5mv^{2}$ - $0.5mvf^{2}$
when the Bear reaches the bottom of the pole, the final velocity (Vf) is 0, therefore the change in kinetic energy becomes ΔKE = $0.5x25x5.6^{2}$ - 0 = 392 J