In the action adventure film Indiana Jones and the Raiders of the Lost Ark , Ind

Question

In the action adventure film Indiana Jones and the Raiders of the Lost Ark, Indiana Jones searches for the Ark of the Covenant. In one well-known nail biting scene Indiana tries to escape being crushed by a huge boulder rolling down a sloping terrain inside a tunnel. The rolling boulder of mass m rolls down the only path that Indiana Jones can take. Assume that the friction force between the sphere and the surface of the hill is negligible.

At a particular time t1 the spherical boulder is at location 1 and moving with velocity v1. At a later time t2 the sphere is at location 2 and moving with velocity v2. Locations 1 and 2 are at vertical heights h1 and h2respectively, from the bottom of the tunnel.

When answering the following questions use 1 and 2 for subscripts to identify the different variables at the two different locations.

What is the equation for the rotational kinetic energy KR,1 of the spherical boulder? (Select all that apply.)

KR,1 = .5I?12

KR,1 = .5mv12

KR,1 =

.5 I v12

KR,1 = .5I mv12

KR,1 =

.2mv12

KR,1 = 0

Explanation / Answer

1st and 5th staements are only correct.

KR,1 = .5I?12 (0.5*I*w1^2) ----> True

KR,1 = .5mv12

KR,1 = .5 I v12

KR,1 = .5I mv12

KR,1 = .2mv12 (0.2*m*v1^2) ---> true

KR,1 = 0

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