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Q1. A student who weighs 510 N is wearing a backpack that weighs 70 N. The student is standing still on a level ground. Give the answers to the following questions in Newtons.
(a) What is the magnitude of the net force on student?
(b) What is the magnitude of the contact force on the student by backpack?
(c) What is the magnitude of the contact force on the student by ground?
Q2. A proton is initially at rest at a point where the potential is 459 V. Sometime later the proton is at a point where the potential is 218 V. If no force other than an electrostatic force acts on the proton, what is its final kinetic energy?
when the field is vertical to the plane of loop, when the field makes a 90.0 angle with the normal to plane.
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s. What is the frequency heard by the observer? Imagine the speed of sound in air to be 340 m/s.
A 260 wooden raft floats on a lake. When an 80 man stands on the raft, it sinks 5.0 deeper into the water. When he steps off, the raft vibrates for a while. What is the frequency of vibration.
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A 12 kg mass starts from rest and slides down an inclined plane 8.0 10-1 m long in 0.9 s. What net force is acting on the mass along the incline?
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A box is hanging from a chain having a mass of 60 kg. The box has a mass of 78 kg. Find the tension in the top of chain and the bottom of the chain.
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