A 70 kg trampoline artist jumps vertically upward from the topof a platform with a speed of 4.2 m/s. (Figure 1)a)How fas... 查看全部
A 1.80 m tall person lifts a 1.75 kg book off the ground so itis 2.20 m above the ground.a) What is the potential energy... 查看全部
A geologist finds that a moon rock of mass 22 kg has an apparent mass of 6.9 kg when submerged fully in a liquid of dens... 查看全部
In the diagram below the displacement-time-graph of a spring oscillator is given. y/cm 20+ 10+ t/s or 0.2 0.4 0.6 0.8 i ... 查看全部
This is an displacement-time (x-t) graph of a SHM. А 2T -A For A = 4.5cm and T = 1.5s find the velocity at 0.3s. Write r... 查看全部
A driver notices that her 1130 kg car slows down from 96 km/h to64 km/h in about 6.5 s on the level when it is in neutra... 查看全部
A daring 510-N swimmer dives off a cliff with a runninghorizontal leap, as shown in Figure 1. What must her minimum spee... 查看全部
8) (15 points) A child drags her toy box (m = 4 kg) up a hill by applying a force F = 25î + 3ſ(N). The surface of the hi... 查看全部
An object of mass 1772 g undergoing simple harmonic motion takes 1.5 s to travel from one point of zero velocity to the ... 查看全部
9. (15 points) Two objects with masses m1 = 2 kg and m2 = 8 kg make an inelastic collision and then moves with final vel... 查看全部