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A weightlifter curls a 35kg bar, raising it each time a distance of 0.65m. How many times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency. Pizza=300 cal or 1260J
A satellite revolves around a planet at an altitude equal to the radius of the planet. The force of gravitational interaction between the satellite and the planet is F_0. Then the satellite moves to a different orbit, so that its altitude is tripl..
a car moving with a speed of 15 ms is slowed to a speed of 5 ms without changing its direction of motion covering a
A sinusoidal wave travels along a stretched string. A particle on the string has a maximum velocity of 0.900m/s, What is the amplitude of the wave
Radar at an airport tells an air traffic controller that a light airplane is approaching at 220 km/h at 33° north of east. Instruments also tell the air traffic controller that there is a wind blowing at 42 km/h at 25° west of south. What is th..
A line in the x-ray spectrum of gold has a wavelength of 18.5 pm(=18.5x10^-12 m) The emitted x-ray photons corresponds to a transition of the gold atom between two stationary states, the upper one of which has the energy -13.7 keV. What is the ene..
An airplane, flying horizontally at an altitude of 1.83 km at a speed of 346 m/s, releases a package. find the speed of the package just before it reaches the ground
A 70.0cm wire of mass 8.20g is tied at both ends and adjusted to a tension of 41.0N. When it is vibrating in its second overtone, find the frequency at which it is vibrating
When laser light of wavelength 633.3nm passes through a diffraction grating. thef irst bright spots occur at +- 18.4 degree from the central maximum, At what angle do the second bright spots occur
At time t=0s, a wheel has an angular displacement of zero radians and an angular velocity of (+28) rad/s. Calculate the average angular velocity in the interval from t=0 to t=20
A battery with an emf of 12.0 V shows a terminal voltage of 11.4V when operating in a circuit with two lightbulbs, What is the battery's internal resistance
An argon-ion laser produces a cylindrical beam of light whose average power is 0.662 W. How much energy is contained in a 1.88-m length of the beam
A prospector finds a solid rock composed of granite(?= 2650 kg/m3)and gold. The volume of the rock is3.30multiplied by10-4m3and its mass is3.03kg
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