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A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 236 N. (a) You push horizontally on the box with a force of 129 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor? ?s > (b) If you must push horizontally on the box with a force of at least 137 N to start it sliding, what is the coefficient of static friction? (c) Once the box is sliding, you only have to push with a force of 113 N to keep it sliding. What is the coefficient of kinetic friction?
A saw blade has a mass of 0.5 kg and a radius of 10 cm and is rotating at 300 rpm. What frictional torque acts on the saw blade as it slows to a stop
a force of 1250 N is used to push a piano up a ramp 12 m long to a height of 1.5 m above the ground. the piano weighs 7500 N. what is the work input and output
A 15.25 kg object moving east at 2.50 m/s collides with and bounces off of a 28.75 kg object moving west at 1.75 m/s. what is the final velocity of the lighter object
Harold the Hurler is a physics student who is renowned for his baseball pitching arm. In order to determine the amount of work he performs in throwing a baseball, How much work does Harold perform on the baseball
One ball of mass 575 g traveling 3.50 m/s to the right collides with another ball of mass 425 g that is initially at rest. What is the velocity of the heavier ball after collision
A single circular loop of radius 0.23m carries a current of 2.7A in a magnetic field of 0.96T. What is the maximum torque exerted on this loop
A bird sitting in a tree is travelling at 40 km/s relative to the faraway Sun. When the bird drops to the ground below, does it still go 40 km/s, or does this speed become zero.
A box with a total surface area of 1.11 m2 and a wall thickness of 3.1 cm is made of an insulating material. A 12.9 W electric heater inside the box maintains the inside temperature at 16.3C above the outside temperature. Find the thermal conductivit..
A glass window 0.35 cm thick measures 81 cm by 36 cm. How much heat flows through this window per minute if the inside and outside temperatures differ by 17° C
To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, what will be the speed of the discus at release
Emilie's potter's wheel rotates with a constant 2.20rad/s2 angular acceleration. What was the angular velocity of the wheel at the beginning of the 3.30s interval
It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm; the calculation is similar. What are the fractions of muscle and fat in the leg
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