Questions from College Physics

Q: Measuring coefficients of friction A coin is placed near one edge of

Measuring coefficients of friction A coin is placed near one edge of a book lying on a table, and that edge of the book is lifted until the coin just slips down the incline as shown in Figure P4.82. T...

Q: A 2.00-kg aluminum block and a 6.

A 2.00-kg aluminum block and a 6.00-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ...

Q: On an airplane’s takeoff, the combined action of the air around

On an airplane’s takeoff, the combined action of the air around the engines and wings of an airplane exerts an 8000-N force on the plane, directed upward at an angle of 65.0° above the horizontal. The...

Q: Two boxes of fruit on a frictionless horizontal surface are connected by

Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in Figure P4.85, where m1 = 10.0 kg and m2 = 20.0 kg. A force of 50.0 N is applied to the 20.0-kg box. (a) De...

Q: A sled weighing 60.0 N is pulled horizontally across snow

A sled weighing 60.0 N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is 0.100. A penguin weighing 70.0 N rides on the sled, as in Figure P4.86. I...

Q: A car accelerates down a hill (Fig. P4.87

A car accelerates down a hill (Fig. P4.87), going from rest to 30.0 m/s in 6.00 s. During the acceleration, a toy (m = 0.100 kg) hangs by a string from the car’s ceiling. The acceler...

Q: An inventive child wants to reach an apple in a tree without

An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley (Fig. P4.88), the child pulls on the loose...

Q: The parachute on a race car of weight 8820 N opens at

The parachute on a race car of weight 8820 N opens at the end of a quarter-mile run when the car is traveling at 35.0 m/s. What total retarding force must be supplied by the parachute to stop the car...

Q: If only one force acts on an object, can it be

If only one force acts on an object, can it be in equilibrium? Explain.

Q: A fire helicopter carries a 620-kg bucket of water at

A fire helicopter carries a 620-kg bucket of water at the end of a 20.0-m-long cable. Flying back from a fire at a constant speed of 40.0 m/s, the cable makes an angle of 40.0° with respect to the ver...