To move two crates, two people push on them with the same force for the same amount of time. One of the crates has double the mass of the other one. If friction can be ignored, which crate will acquire the greatest momentum (the lighter one or the heavier one) or will they both acquire the same momentum? Also, which crate will acquire the greatest kinetic energy or will they both acquire the same kinetic energy?

Two boxes of different mass are at rest. If both boxes are acted upon by equal force, which of the following statements is then true? А. If both boxes are pushed for the same amount of time, then both boxes will have the same final kinetic energy. В. If both boxes are pushed the same distance, then the lighter box will have the greater final momentum. If both boxes are pushed the same amount of time, then the lighter box will have the smaller final kinetic energy. C. D. If both boxes are pushed the same amount of time, then the heavier box will have the greater final kinetic energy. Е. If both boxes are pushed the same distance, then both boxes will have the same final kinetic energy.

2. Consider the following arrangement of masses: Mass 1 is connected to mass 2 by a very light string and moves over a frictionless pulley so that both masses move with the same speed and move the same distances (m₂ to the right a distance d and m₁ down a distance d). Assume m₁ 15 kg, m₂ 15 kg, and the coefficient of kinetic friction between m₂ and the table is k = 0.73. Let the masses start with an initial speed of 1.00 m/s. What is their speed after moving 1.00 cm (d = 0.0100 m)? - mq - -25 ms m1

Particle A has mass m. Particle B has twice the mass of Particle A. The same constant force F acts on both particles for time At. Which particle has the larger kinetic energy? Ο ΕΑ> EΒ О ЕA < Ев EA = EB There is not enough information to tell.

A trap-jaw ant snaps its mandibles shut at very high speed, a good trait for catching small prey. But an ant can also slam its mandibles into the ground; the resulting force can launch the ant into the air for a quick escape. A 12 mg ant hits the ground with an average force of 47 mN for a time of 0.10 ms; these are all typical values. At what speed does it leave the ground? Answer out to 3 decimal places.

Gayle runs at a speed of 3.60 m/s and dives on a sled, initially at rest on the top of a frictionless snow - covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 46.5 kg, the sled has a mass of 5.10 kg and her brother has a mass of 30.0 kg.

Gayle runs at a speed of 4.35 m/s and dives on a sled, initially at rest on the top of a frictionless snow-covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 49.5 kg, the sled has a mass of 5.25 kg and her brother has a mass of 30.0 kg. m/s Need Help?

Gayle runs at a speed of 3.20 m/s and dives on a sled, initially at rest on the top of a frictionless snow-covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 45.0 kg, the sled has a mass of 5.25 kg and her brother has a mass of 30.0 kg. m/s

Figure 11 8. A skier (68 kg) starts from rest but then begins to move downhill with a net force of 92 N for 8.2 s. The hill levels out for 3.5 s. On this part of the hill, the net force on the skier is 22 N [backwards]. ™ (a) Calculate the speed of the skier after 8.2 s. (b) Calculate the speed of the skier at the end of the section where the hill levels out. (c) Calculate the total distance travelled by the skier before coming to rest.