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A 7.0 kg ball with the initial velocity of (7i+5j)m/s collides with a wall and rebounds with a velocity of (-7i+5j)m/s. what is the impulse exerted on the ball by the wall.
A film of MgF2 (n = 1.38) having thickness 1.68 10-5 cm is used to coat a camera lens, What are the three longest wavelengths that are intensified in the reflected light
In 1960 a Tampa, Florida, mother reportedly raised one end of a car that had fallen onto her son when a jack failed. how much work did her force do on the car
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.4 10-6 T. What is the intensity S of the wave
The average frictional force exerted on him by the pole has a magnitude of 815 N, and his speed at the bottom of the pole is 3.7 m/s. Explain how far did he slide down the pole?
How many wavelengths are there in one pulse
A 45.3 g mass is attached to a horizontal spring with a spring constant of 14 N/m and released from rest with an amplitude of 37.2 cm. What is the velocity of the mass
An elevator releases 11200J of gravitational potential energy as descending 4m between floors. How much does elevator weigh.
A particle's trajectory is described by x=(12t3?2t2)m and y =(12t2?2t)m, What is the particle's direction of motion, measured as an angle from the x-axis, at t=5.0s
A 24.7cm diameter coil consists of 45 turns of circular copper wire 1.0mm in diameter. A uniform magnetic field, Determine the rate at which thermal energy is produced
Using the Bohr model what is the radius of the electron orbit in the Hydrogen atom when the electron is in the n = 2 state, What is the energy of the Hydrogen atom
If the temperature outside is a freezing -15 (celsius), and as you drive at 60 km/h, you see a police car heading towards you, How fast is the police car traveling
A crate of mass m = 33 kg rides on the bed of a truck attached by a cord to the back of the cab, find the maximum acceleration the truck can have before the cord breaks
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