4. The cars in a soapbox derby have no engines; they simply coast downhill. Whic

Question

4. The cars in a soapbox derby have no engines; they simply coast downhill. Which of the following design criteria is best from a competitive point of view? The car's wheels should a. b. have large moments of inertia be massive c. be hoop-like wheels rather than solid disks have small moments of inertia 5. A mouse is initially at rest on a horizontal turntable mounted on a frictionless, vertical axle. As the mouse begins to walk clockwise around the perimeter, which of the following statements must be true of the turntable? it also turns clockwise it turns counterclockwise with the same angular velocity as the mouse it remains stationary it turns counterclockwise because angular momentum is conserved a. d.

Explanation / Answer

4.Total kinetic energy of the car is the sum of translational kinetic energy and rotational kinetic energy. If the car reaches down the hill in shortest time, it must have greater translational kinetic energy and lesser rotational kinetic energy. Rotational kinetic energy depends on moment of inertia of the car wheel. If the moment of inertia is less, car possess less rotational kinetic energy,is the best form a competating point of view.

Option (d) is correct.

5.If the mouse begins to walk clockwise, around the perimeter of the turn table, from the law of conservation of angular momentum it turns counter clockwise.

Option (d) is correct.

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