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A 2.80 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 22.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 7.00 m. (a) Find the work done by the pulling force.
There are two identical, positively charged conducting spheres fixed in space. The spheres are 36.2 cm apart, find the initial charge on each sphere
Together, two students exert a force of 640 N in pushing a car a distance of 30 m. How much work do the students do on the car
A block of mass m = 2 kg and initial velocity v = 5 m/s runs into and compresses a spring of spring constant k = 50 N/m. How long is the block in contact with the spring
A sample 114 nd has a mass of 0.055395 kg and emits an average of 2.36 alpha particles per second. Determine the decay constant and the half-life
A 5.5 %u03BCC point charge is placed in an external uniform electric field that has a magnitude of 68000 N/C
A small, 200 kg cart is moving at 1.50 m/s on an air track when it collides with a larger, 1.00 kg cart at rest. What is the speed of the large cart after the collision
The right figure shows a force of magnitude F = 12.0 N applied to an 8.00 kg block at a downward angle of ? = 30.0°. find the magnitude of the frictional force on the block
A cannon tilted up at a 30° angle fires a cannon ball at 90 m/s from atop a 16 m high fortress wall. What is the ball's impact speed on the ground below
An iceboat is gliding on a frozen lake with no propulsive force being applied. Does the horizontal momentum of the boat Change
A gas in an engine undergoes a reversible cycle in which 152 Joules of work are done and 419 Joules of heat are supplied by the fuel. what would the high temperature be
A heat pump is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Suppose that the ratio of the actual energy entering the room to the work done by the device's motor is ..
Two flexible balls rolling along a frictionless horizontal surface collide with each other. The Larger of the balls weighs 50g and the smaller weighs 30g. find the acceleration of the center of mass of the smaller ball
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