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A man lifts a box weighing 50N to a height of 50M in25s.
a) How much work did he do?
b) what power did he expend?
c) What is the mechanical energy at a height of 20M above the ground?
In a standing wave pattern the distance between the second and the seventh nodes is 5cm. find the wavelength and the speed of the wave
A ball thrown horizontally at 23 m/s travels a horizontal distance of 55 m before hitting the ground. From what height was the ball thrown
If a four engine jet accelerates down the runway at 2m/s2 & one of the jet engines fails, how much acceleration will the other three produce?
The wavelength of the laser beam used in a compact disc player is 510 nm. Estimate the spacing between the slits of the grating
When ultraviolent light with a wavelength of 262nm falls upon a clean metal surface, What is the photoelectic threshold wavelength for this metal
A 3.00kg block starts from rest at the top of a 30.0 degree incline and slides a distance of 2.00m down the incline in 1.50s. Find (a)the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c)..
A 1,699-kg satellite orbits the Earth in a circular orbit with a period of 6,016 s. How high above the Earth's surface is the satellite's orbit
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles, What is the force between the two alpha particles when they are 3.00x10^-15 m apart
A highway curve has a radius of .58 km and is unbanked. A car weighing 36 kN goes around the curve at a speed of 36 m/s without slipping
A point charge of 8.40 mC is surrounded by an equipotential surface with a radius of 0.280 m. What is the electric potential on the surface
A pilot takes off from a city in Northern California and aims her airplane due North toward Seattle with a speed 240 km/h relative to the air. What is the magnitude of the airplane's velocity relative to the Earth
A plate of glass with parallel faces having a refractive index of 1.57 is resting on the surface of water in tank. A ray of light coming from above in air makes an angle of incidence 34.5 degrees with normal to the top surface of the glass.
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