Questions from Modern Physics

Q: Crates A and B sit at rest side by side on a

Crates A and B sit at rest side by side on a frictionless horizontal surface. They have masses mA and mB, respectively. When a horizontal force

Q: You pull horizontally on block B in Fig. E4.26

You pull horizontally on block B in Fig. E4.26, causing both blocks to move together as a unit. For this moving system, make a carefully labeled free-body diagram of block A if (a) the table is fricti...

Q: A ball is hanging from a long string that is tied to

A ball is hanging from a long string that is tied to the ceiling of a train car traveling eastward on horizontal tracks. An observer inside the train car sees the ball hang motionless. Draw a clearly...

Q: You throw a baseball straight upward. If you do not ignore

You throw a baseball straight upward. If you do not ignore air resistance, how does the time required for the ball to reach its maximum height compare to the time required for it to fall from its maxi...

Q: A .22-caliber rifle bullet traveling at 350 m/

A .22-caliber rifle bullet traveling at 350 m/s strikes a large tree and penetrates it to a depth of 0.130 m. The mass of the bullet is 1.80 g. Assume a constant retarding force. (a) How much time is...

Q: A chair of mass 12.0 kg is sitting on the

A chair of mass 12.0 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 40.0 N that is directed at an angle of 37.0° below the horizontal, and...

Q: 12 m/s. The hill rises at 36° above

12 m/s. The hill rises at 36° above the horizontal and has coefficients of kinetic friction and static friction of 0.45 and 0.65, respectively, with these rocks. (a) Find the acceleration of the rocks...

Q: A box with mass 10.0 kg moves on a ramp

A box with mass 10.0 kg moves on a ramp that is inclined at an angle of 55.0o above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is mk = 0.300. Calculate th...

Q: A pickup truck is carrying a toolbox, but the rear gate

A pickup truck is carrying a toolbox, but the rear gate of the truck is missing. The toolbox will slide out if it is set moving. The coefficients of kinetic friction and static friction between the bo...

Q: You are lowering two boxes, one on top of the other

You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp (Fig. E5.33). Both boxes move together at a constant speed of 15.0 cm>s. Th...