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A 13.4-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 7.15 m/s in 1.23 s. In the process, the spring is stretched by 0.153 m. The block is then pulled at a constant speed of 7.15 m/s, during which time the spring is stretched by only 0.0784 m. Find (a) the spring constant of the spring and (b) the coefficient of kinetic friction between the block and the table.
A satellite has a mass of 5839 kg and is in a circular orbit 4.10 × 105 m above the surface of a planet. The period of the orbit is 1.7 hours. The radius of the planet is 4.88 × 106 m. What would be the true weight of the satellite if it were at rest..
From what height will you have to drop the rock on Earth so that the fall-time on both planets is the same.
In the old west, a marshal riding on a train traveling 50 m/s seesa duel between two men standing on the Earth 50 m apart parallel tothe train. Who was struck first
2.28 kg of water are changed from ice at 0degc into liquid water at 0degc. the latent heat of fusion for water is lf
A train traveling at v0 = 28.0 m/s begins to brake by applying a velocity-dependent instantaneous acceleration a(v) = ? /(v+u) m/s^2, Determine the distance traveled by the train until it comes to a complete stop
the magnitude jr of the current density in a certain cylindrical wire is given as a function of radial distance from
A 9.0-V battery is connected to a bulb whose resistance is 2.7Ω. How many electrons leave the battery per minute
Two rectangular pieces of plane glass are laid one upon the other on a table. A thin strip of paper is placed between them at one edge, Find the angle of the wedge
The rotational inertia of a collapsing spinning star changes to 1/4 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy.
The temperature difference between the inside and the outside of a home on a cold winter day is 49°F. Express this difference on the Celsius scale.
The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker.
A 4 kg block is acted upon by three horizontal forces. 10n (to left) 5n(short arrow to right) 25n to right. what is the net horizontal force acting on the block? what is the horizontal acceleration of the block?
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