Chapter 8 Problem Worksheet following questions are either TRUE or FALSE. Write

Question

Chapter 8 Problem Worksheet following questions are either TRUE or FALSE. Write which you think it is. The sum of the kinetic and potential energies of an object is conserved only when the object is un fluence of conservat?ve forces. the one alternative that best completes the statement or answers the question. A. 7) 6 J of work is needed to push an object of mass 2 kg from point A to point B of the frictionless inclined plane as shown in the figurea above. If the angle of inclination is 30, the height of the plane is h, what is the length of the Inndplane Use 9 10m/ A) 0.3 m B) 6 m C) 0.6 m D) 10 m E) 3 m certain point it has 40 J of 8) An object with a mass of 10 kg is moving along a horizontal surface. At a is 0.60, how far will the kinetic energy. If the coefficient of f object go beyond that point before coming to a stop? Use g - 10 m/s2, A) 5.7 cm B) 60 cm C) 67 cm D) 17 cm E) 42 cm

Explanation / Answer

Suppose the length of incline is L, then

sin 30 deg = h/L

L = 2*h

Now Using energy conservation

W = dPE

W = m*g*h

h = W/mg

Using given values:

h = 6/(2*10) = 0.3 m

So,

L = 2*0.3 = 0.6 m

Correct option is C

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