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A 75 kg man is riding an escalator in a shopping mall. Theescalator moves the man at a constant velocity from ground level tothe floor above, a vertical height of 4.60 m. What is the work done on the man by
a) the gravitational force and
b) the escalator.
A parallel-plate capacitor made of circular plates of radius 85 cm separated by 0.20 cm is charged to a potential difference of 1000 volts by a battery. How much additional charge flows from the battery to one of the plates when the Teflon film is ..
A resistor with 325? and an inductor are connected in series across an ac source that has voltage amplitude 520V . The rate at which electrical energy is dissipated in the resistor is 234W. What is the amplitude of the voltage across the inductor
What are the key components of the scientific method? Why is Intelligent Design not considered to be science? Modification of a hypothesis is a perfectly acceptable part of science and almost any theory can be modified to explain new data. How is thi..
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. Evaluate the speed of the arrow as it leaves the bow?
Electrons are ejected from a metallic surface with speeds ranging up to 4.5 105 m/s when light with a wavelength of ? = 625 nm is used. What is the work function of the surface
The mass of a space shuttle is approximately 2.0x10^6 kg. Throughout lift-off, the net force on the shuttle is 1.0x10^7 newtons directed upward. What is the speed of the shuttle 10 seconds after liftoff.
A cue ball (mass = 0.165 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick, which applies an impulse of +1.61 N·s to the ball. Find the velocity of the second ball just after it is struck
The leg and cast weigh 177N (w1). Find out the weight w2 and the angle α required so that no force is exerted on the hip joint by the leg plus cast.
Unless otherwise stated, all objects are located near the Earth's surface, where g = 9.80 m/s2. A student weighing 660N crouches on a scale and suddenly springs vertically upward
Two hanging masses are connected by ropes to a 20 kg mass which sits on a frictionless table. find The amount of unbalanced force acting on the masses,
Water undergoes viscous flow through two pipes with the same pressure difference between the ends. what is the flow rate through pipe 2
A simple pendulum has a period of 3.74 s. The acceleration of gravity is 9.8 m/s^2 What is its length? What would its period be on the Moon
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