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Q1. A 320 kg wooden raft floats on a lake. When a 75 kg man stands on the raft, it sinks 3.5 cm deeper into the water. When he steps off, the raft vibrates for a while.
What is the frequency of vibration?
What is the total energy of vibration (ignoring damping)?
Q2. A helicopter is ascending vertically with a speed of 5.45m/s. At a height of 141m above the Earth, a package is dropped from a window. How much time does it take for package to reach the ground?
A 55-kg swimmer is standing on a stationary 210-kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.6 meter per second relative to the shore. Calculate the recoil velocity that the raft would have if there were ..
What is lemmings kinetic energy
A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
Compute the momentum of the bullet
The sound level measured in the room by a person watching a movie in a home theatre system varies from 63 dB throughout a quiet part to 92 dB throughout a loud part. In the order of how many times louder is the latter sound.
Compute gauge pressure of the flowing water
However, the current begins to decrease as the resistive element warms up. When the toaster reaches its final operating temperature, the current has dropped to 1.53 A.
Determine the location at which the tuning is formed and the vibrating frequency of a string to form a standing wave pattern.
What is the amplitude of subsequent oscillations
An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60.0 percent of the energy usage, what altitude change can a rider achieve when driving in hilly terrain, if the rider and scoote..
A rod supports a 2.35 kg lamp. a) What is the tension in the rod? b) Estimate the components of the force that the bracket exerts on the rod.
Calculate the pressure at the center of pipe A. Suppose T = 10?C.
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