Questions from College Physics

Q: It has been suggested that rotating cylinders about 10 mi long and

It has been suggested that rotating cylinders about 10 mi long and 5.0 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acce...

Q: (a) What is the tangential acceleration of a bug on

(a) What is the tangential acceleration of a bug on the rim of a 10.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular velocity of 78.0 rev/min in 3.00 s? (b) When the disk...

Q: An adventurous archeologist (m = 85.0 kg) tries

An adventurous archeologist (m = 85.0 kg) tries to cross a river by swinging from a vine. The vine is 10.0 m long, and his speed at the bottom of the swing is 8.00 m/s. The archeologist doesn’t know t...

Q: One end of a cord is fixed and a small 0.

One end of a cord is fixed and a small 0.500-kg object is attached to the other end, where it swings in a section of a vertical circle of radius 2.00 m, as shown in Figure P7.19. When θ =...

Q: A racetrack is constructed such that two arcs of radius 80 m

A racetrack is constructed such that two arcs of radius 80 m at â’¶ and 40 m at â’· are joined by two stretches of straight track as in Figure 7.8. In a particular tr...

Q: Human centrifuges are used to train military pilots and astronauts in preparation

Human centrifuges are used to train military pilots and astronauts in preparation for high-g maneuvers. A trained, fit person wearing a g - suit can withstand accelerations up to about 9g (88.2 m/s2)...

Q: A 55.0-kg ice skater is moving at 4

A 55.0-kg ice skater is moving at 4.00 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.800 m around the pole. (a) Determ...

Q: A 40.0-kg child swings in a swing supported

A 40.0-kg child swings in a swing supported by two chains, each 3.00 m long. The tension in each chain at the lowest point is 350 N. Find (a) The child’s speed at the lowest point and (b) The force ex...

Q: A certain light truck can go around a flat curve having a

A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 32.0 m/s. With what maximum speed can it go around a curve having a radius of 75.0 m?

Q: A sample of blood is placed in a centrifuge of radius 15

A sample of blood is placed in a centrifuge of radius 15.0 cm. The mass of a red blood cell is 3.0 x 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 x 10-1...