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A 100N box initially at rest is pulled by a horizontal rope on a horizontal table the coefficients of kinetic and static friction between the box and the table are .25 and .60, respectively. What is the friction force on the box if the pull is 35N and 75N?
A machine pulls a 40 trunk a distance of 2 m along a 40 degree incline at constant speed. what is the work done on the truck by the machines force
A petite young woman distributes her 540N weight equally over the heels of her high-heeled shoes. Each heel has an area of 0.850 cm^2, What pressure is exerted on the floor by each heel
A 20.0 kg box is pulled up a ramp a distance d = 15.0 m with a force of Fp = 165 N parallel to the ramp, as shown in the figure to the right. Find the work done on the block by gravity
A bird watcher meanders through the woods, walking 0.496 km due east, 0.754 km due south, find the magnitude (in kilometers) of the bird watcher's displacement.
The nucleus 11-4 Be undergoes B- decay with a half-life of 13.8 sec. The atomic mass of 11-4 Be is 11.021660 u. What is the total kinetic energy of the decay products
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 5.54 m/s relative to the ground. How fast is the train moving
q1. a 0.50-kg object is attached to an ideal massless spring of spring constant 20 nm along a horizontal frictionless
Atomic physicists usually ignore the effect of gravity within an atom. To see why, we may calculate and compare the magnitude of the ratio of the electrical force, What is the magnitude of the electrical force
A composite bar made from two different materials of equal cross-sectional areas are directly attached to each other making the bar a length of L = L1 + L2.
A car is moving at 9 m/s along a curve on a horizontal plane with radius of curvature 46 m. The acceleration of gravity is 9.8. Find the rotational frequency of the wheel
An isolated conductor of arbitrary shape has a net charge of +1.1 multiply.gif 10-5 C. What is the charge on the cavity wall
Two rockets approach earth from opposite directions at equal speeds relative to the earth. How fast are the rockets moving with respect to the earth
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