A heat engine does 78,000 J of work during 20 minutes. Find the power supplied b

Question

A heat engine does 78,000 J of work during 20 minutes. Find the power supplied by the engine. A block is projected with a speed of 2.5 m/s on a horizontal surface. If the block comes to rest in 1.5m, what is the coefficient of kinetic friction between the block and the surface? A 6.0 N net force is applied to a 1.5kg mass. What is the object's acceleration? A force acts on a 1.5kg, mass, giving it an acceleration of 3.0 m/s^2 If the same force acts on a 22.5kg mass, what acceleration would be produced? What is the magnitude of the force?

Explanation / Answer

6) W = 78000 J , t = 20 min

P = W/t = 78000/(20*60)

P = 65 W

7) u = 2.5 m/s, v = 0 , s = 1.5 m

v^2 -u^2 = 2as

a =uk*g

0 -2.5^2 = - 2uk*9.8*1.5

uk = 0.213

8) F = 6 N , m = 1.5 kg

F = ma

6 = 1.5*a

a = 4 m/s^2

9) m = 1.5 kg, a = 3 m/s^2

F = ma = 1.5*3 = 4.5 N

A) m = 22.5 kg

4.5 = 22.5*a

a = 0.2 m/s^2

B) F = 4.5 N

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