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A factory worker pushes a crate of mass 30.7 a distance of 4.10 along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.26. What magnitude of force must the worker apply? How much work is done on the crate by this force? How much work is done on the crate by friction?
Blue light of frequency 6.0 1014 Hz falls on the surface of potassium, which has a work function of 2.26 eV. Find the maximum kinetic energy of emitted electrons
You are standing 4.5m from a convex security mirror in a store. You estimate the height of your image to be half of your actual height. Estimate the radius of curvature of the mirror
A football is kicked straight up into the air; it hits the ground 3.4 later. With what speed did it leave the kicker's foot
Only two forces act on an object (mass = 4.60 kg). (F = 68.0 N.) Determine the magnitude and direction (relative to the x axis) of the acceleration of the object.
Find the gravitational attraction between two solid lead spheres of 1 kg mass each if the spheres are almost in contact
At one instant a bicyclist is 40m due east of a park's flagpole, going due south with a speed of 10m/s. Then 30.0s later, the cyclist is 40m due north of the flagpole.
The switch in a circuit has been open for a long time. The resistors in the circuit each have a value of 60 Ohms, find the total equivalent inductance of the circuit
In the experiment to study polarization, the angle between the transmission axes of two polarizers is theta. Light from the incandescent light source passes through both polarizers. Calculate the value of the angle theta
The mass of Jupiter is 300 times that of the earth, and the diameter is 11 times that of the earth, find the acceleration due to gravity on Jupiter's surface
A single atom of cesium-133 has a mass, in atomic mass units, of 132.90545193 u. Determine the average binding energy per nucleon
Two 5000 kg passenger cars roll without friction (one at 1 m/s, the other at 2 m/s) toward one another on a level track. They collide, couple, and roll away together with the combined momentum.
question1two people are carrying a uniform wooden board that is 3.00 m long and weighs 160 n. if one person applies an
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