Two cars that have the same mass are moving around a circular track at the same

Question

Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then A. the frictional force on car 1 is greater than the frictional force on car 2 B. the frictional force on car 1 is less than the frictional force on car 2 C. the frictional forces on both cars are equal and greater than zero. D. the frictional force on both cars is zero. Which of the following is not an energy unit? A N middot m B. Joule C. Watt D. calorie E. kWh A brick slides across a horizontal rough surface and eventually comes to a stop What happened to the kinetic energy of the brick? A. Nothing; it is still in the brick but is now called potential energy. B. It was converted to other energy forms, mostly heat C. It was converted to a potential energy of friction. D. It was simply destroyed in the process of stopping. An object with a kinetic energy of 40 J is stopped in a distance of 0.01 m The average force that stops the object is A 40,000 N B. 4,000 N. C. 400 N D. 40 N E. 0.4 N. A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is A 300 J. B. 200 J. C. 100 J D. 0.20 J. E. 5.0J. A bullet is fired into a wall and comes to rest. Considering only the bullet as the system we can say that A. the total kinetic energy is conserved B. the momentum is conserved C. neither total kinetic energy nor momentum is conserved. D. both total kinetic energy and momentum are conserved A toy car and a toy truck at rest have a compressed spring in between them. The truck has more mass than the car. The spring is released and the two cars move in opposite directions. Which of the following is true? A. The magnitude of the truck's momentum is the same as the car's. B. The magnitude of the truck's momentum is larger than the car's C. The magnitude of the truck's momentum is smaller than the car's. D. It is not possible to tell which has more momentum without knowing the speeds.

Explanation / Answer

Answering 4 parts:

Q.7 ( option C ): watt is the unit of power

Q.8 Option (B) : Kinetic energy get dissipated as heat

Q.9 work done = F s

F = W/s= 40/ 0.01=4000 N ( option B)

Q 11: Only momentum is conserved, it's a case of inelastic collision, so KE is not conserved.

option B

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