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A person pushing horizontally a uniformly-loaded 21.85 kg wheelbarrow is attempting to get it over a horizontal step whose height is 35.0% of the wheel's radius. What is the minimum force necessary to push the wheel barrow over that step?
Two masses, m1 = 20 kg and m2 = 24 kg, are connected by a rope that hangs over a pulley. Find the magnitudes of the velocities of the masses after each of the masses travels a distance d = 1.5 meter
The current in a series circuit is 14.0 A. When an additional 19.0 ohm resistor is inserted in series, the current drops to 10.5 A, What is the resistance in the original circuit
(a) Calculate the number of gas molecules per cubic centimeter at this pressure. (b) What is the mean free path of the gas molecules if the molecular diameter is 2.12 x 10-8 cm.
A frictional force of 320 N acts on the rim of a 1.4 m diameter wheel to oppose its rotational motion. What is the torque about the wheel's central axis
A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10 m/s. the instant before the stone hits the ground below, it has 450 j of kinetic energy. if she were to throw the stone horizontally outward from..
we have a tuning fork with a frequency f resonating in a cavity with an open top of width 2.54cm and a length of 20.4cm at 20 degrees celsius and one atm
What is the distance between the mirror and the image (negative result for a position behind the mirror, a positive result for a position in front of the mirror)?
A rocket accelerates vertically up from ground level from rest at 30 m/s^2 for 30 s; then runs out of fuel. What is the rocket's final altitude? (Ignore air resistance) .
You would like to store 8.5J of energy in the magnetic field of a solenoid. The solenoid has 630 circular turns of diameter 7.2cm distributed uniformly along its 25cm length. How much current is needed
A circuit with 2 capacitors, C1 = 22.0 ?F and C2 = 16.0 ?F, are hooked up in parallel to each other, Calculate how much energy each capacitor can store
You are swimming underwater in a waist-deep pool looking up at a nearby person who is standing in the pool. Does the person appear to be shorter or taller than his or her actual height? Draw a diagram to support your answer.
A sledge loaded with bricks has a total mass of 17.1 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. What is the mechanical energy lost due to friction
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