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A 65 kg crate slides on a rough plane inclined upward at an angle of 28 degrees. The crate is hauled up the plane by lightweight rope that goes parallel to the incline and then over the pulley at the top of the incline. A worker standing below the pulley pulls vertically downward on the rope. If the 55 kg worker hangs his or her entire weight from the rope, it is barely sufficient to move the crate up the incline at a constant velocity of 1.2 m/s.
a) what is the magnitude of the sliding friction force on the box?
b) what is the coefficient of kinetic friction between teh box and the incline?
An occupant of a car has a chance of surviving a crash if the deceleration all through the crash is not more than 30.00 g. Approximation the force on a 72 kg person decelerating at this rate.
Suppose a heat engine takes in 420 J of energy from a hot reservoir and performs 30 J of work in each cycle.
From what height did the student fall? Assume that the only force acting on him throughout the collision is that as a result of the ground.
Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of single wavelength. It then falls on two slits separated by 0.410 . In resulting interference pattern on a screen 2.10 away, adjacent bri..
What is average kinetic energy of each helium atom
Two 10 cm-diameter charged thin rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC. What is the electric field.
Which is safer as a road material
A 0.15 kg ball is placed in a shallow wedge with an opening angle of 150.For each contact point between the wedge and ball, find out the force exerted on the ball. Assume the system is frictionless.
A pair of speakers separated by 0.7 m is driven by the same oscillator at a frequency of 674Hz. An observer, first positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers. (Assume the speed of ..
An 800 g ball moves in a vertical circle on a 1.07-m-long string. If the speed at the top is 5-m/s, after that the speed at the bottom would be 8.18 m/s.
what is the direction of its velocity relative to the frame of reference.
The distance between two telephone poles is 55.55 m. When a 1.00 kg bird lands on the telephone wire midway between the poles, the wire sags 0.165 m. illustrate a free-body diagram of the bird.
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