Questions from College Physics

Q: A rifle with a weight of 30.0 N fires a

A rifle with a weight of 30.0 N fires a 5.00 - g bullet with a speed of 3.00 x 102 m/s. (a) Find the recoil speed of the rifle. (b) If a 7.00 x 102 - N man holds the rifle firmly against his shoulder,...

Q: A 45.0 - kg girl is standing on a 150

A 45.0 - kg girl is standing on a 150. - kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a...

Q: A girl of mass mG is standing on a plank of mass

A girl of mass mG is standing on a plank of mass mP. Both are originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant v...

Q: Squids are the fastest marine invertebrates, using a powerful set of

Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then eject water in a form of jet propulsion that can propel them to speeds of over 11.5 m/s. What speed wou...

Q: A tension force of 175 N inclined at 20.0°

A tension force of 175 N inclined at 20.0° above the horizontal is used to pull a 40.0 - kg packing crate a distance of 6.00 m on a rough surface. If the crate moves at a constant speed, find (a) The...

Q: A 75 - kg fisherman in a 125 - kg boat throws

A 75 - kg fisherman in a 125 - kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of Ï…i = 4.5 m/s as in Figure P6.26. Neglecting water resistance, and ass...

Q: A 65.0 - kg person throws a 0.045

A 65.0 - kg person throws a 0.045 0 - kg snowball forward with a ground speed of 30.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The first person is...

Q: Two objects of masses m1 = 0.56 kg and m2

Two objects of masses m1 = 0.56 kg and m2 = 0.88 kg are placed on a horizontal frictionless surface and a compressed spring of force constant k = 280 N/m is placed between them as in Figure P6.28a. Ne...

Q: An astronaut in her space suit has a total mass of 87

An astronaut in her space suit has a total mass of 87.0 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she’s on a spacewalk. Initial...

Q: Three ice skaters meet at the center of a rink and each

Three ice skaters meet at the center of a rink and each stands at rest facing the center, within arm’s reach of the other two. On a signal, each skater pushes himself away from the other two across th...