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1. A tennis ball of mass m = 0.060 kg and speed v = 25 m/s strikes a wall at a 45-degree angle. It rebounds with the similar speed, once again at a 45-degree angle. What is the magnitude of the momentum impulse (in Ns) that the ball gave the wall?
2. A block of mass 82 g floats on a fluid, oscillating up and down at a frequency of 7.2 Hz. What is the value (in N/m) of the effective spring constant of the fluid?
a block is made of an unknown material. when placed in water the block floats and 4 m3 of the block is observed to be
A stream turbine at an electric power plant delivers 4 500 kW of power to an electrical generator which converts 95% of this mechanical energy into electrical energy
a 40.5-cm-by-40.5-cm checkerboard has a mass of 108.5 g. there are four 23.5-g checkers located on the checkerboard as
An ambulance is generating a siren sound at a frequency of 2400 Hz. The velocity of sound is 34.0 m/s. What is the frequency of the siren perceived by the observer
An iron tower in is 304 meters tall on a cold day (T = -9 degrees Celsius). What is its height of the tower on a hot day when the temperature is 34.6degrees Celsius
Compute the wavelength of light emitted (in nm) when a hydrogen atom undergoes a transition from the n=10 to the n=20 energy levels. What region of the EM spectrum does this wavelength fall?
A 530.0g bird is flying horizontally at 2.20m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, What is the angular velocity of the bar just after it is hit by the bird
A certain type of laser emits light that has a frequency of 5.4 x10^14 Hz. The light, so, occurs as a series of short pulses, each lasting for a time of 2.7 x10-11 s.
The circuit in the figure below consists of wires at the top and bottom and identical metal springs in the left and right sides. estimate the magnitude of the magnetic field
A 31-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, How high does she rise during this interval
A certain part of aircraft engine has a volume of 1.3ft3. Find the weight of the piece when it is made of iron
A 210-kg crate is being pushed across a horizontal floor by aforce P that makes an angle of 18.6° below the horizontal. The coefficient of kinetic friction is0.209. What should be the magnitude of P, so that the net work done by it and the kinetic..
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