Asked Dec 19, 2019

A block of mass m = 1.50 kg is at rest on a ramp of mass M=
4.50 kg which, in turn, is at rest on a frictionless horizontal
surface (Fig. P8.13a). The block and the ramp are aligned
so that each has its center of mass located at x = 0. When
released, the block slides down the ramp to the left and the
ramp, also free to slide on the frictionless surface, slides to
the right as in Figure P8.13b. Calculate xramp, the distance the
ramp has moved to the right, when xblock = -0.300 m.

x = 0
Figure P8.13

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x = 0 т M a X. *ramp Xblock! Figure P8.13


Expert Answer

Step 1



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Assume that the center of mass of the block-ramp system is unchanged and there is no external force on the system along the horizontal direction. For the distance , the ramp moved due to the motion of the block, the concept of center of mass is used to calculate it. Given info: The x coordinate of the center of gravity of the block-ramp system is 0 m, the distance the block moved left on the ramp is 0.300 m, the mass of the block is 1.50 kg, and the mass of the ramp is 4.50 kg. The formula for the distance that the ramp has moved to the right is, тль+ Mz, Xcm т+M m is mass of the block. M is mass of the ramp. is the distance moved by the block to the left. xr is the distance moved by the ramp to the right.

Step 2



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Substitute 4.50 kg for M, 1.50kg for m, –0.300 m for xb, and 0 m for æcm to find rr. [(1.50 kg)(-0.300 m)]+(4.50 kg)x, (1.50 kg)+(4.50 kg) 0m 0.100 m Thus, the distance moved by the ramp to the right is 0.100 m.


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