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The surfer in the photo below is catching a wave. Suppose she starts at the top of the wave with a speed of 1.8 m/s and moves down the wave until her speed increases to 9.6 m/s. The drop in her vertical height is 2.6 m. If her mass is 59 kg, how much work is done by the (nonconservative) force of the wave?
when responding to sound the human eardrum vibrates about its equilibrium position. suppose an eardrum is vibrating
A rifle with a weight of 40 N fires a 4.5-g bullet with a speed of 270 m/s. If a 775-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
question two objects m1 2.15 kg and m2 4.30 kg sit on a horizontal frictionless surface and are pushed together with
Estimate the distance of GPS satellite from the ground.
A 120-V motor has mechanical power output of 3.00 hp. It is 88.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
consider a small raindrop and a large raindrop falling through the atmosphere. compare their terminal speeds. what are
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
1. two 0.85-m-long pendulums hang side by side. the masses of the pendulum bobs are 75 g and 95 g. the lighter bob is
An astronaut travels to the nearest start system. 10 light years away, and returns at a speed of 0.5c. How much has the astronaut aged relative to those people remaining on Earth?
The electric field of a plane electromagnetic wave is given by: Ex = 0, Ey = 0, Ez = 2.0 cos [0.6? x 1015 (t – y/c)], with all quantities in SI units.
an alumanum disk is held between the poles of a power magnet and then pulled out. the person pulling on the disk feels
An electric wire that has a mass of 5 kg for a 20m length is strung between two poles 20 m apart. What must be the tension in the wire if it is to take .80 seconds for a pulse to travel along the wire from one pole to the other.
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