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A 0.54-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstretched length triples. What is the mass of the second block?
A potter's wheel is a uniform solid disk of diameter 0.72m and a mass of 60kg. what minimum total friction force must the potter supply to the disk if her hands are acting at the edge of the disk
a physics book of mass m is pushed against a wall by a force P that makes and angle (theta) with the horizontal. The co-efficient of static friction is 0.2. Find the normal force on the book
An object of mass "m" is thrown up an inclined plane of angle "theta" with an initial velocity "v knot". If the motion is resisted by retarding force Fr=-kv (where k is a force coefficient and v the velocity of the object.)
A nonconducting solid sphere of radius 11.2 cm has a uniform volume charge density. What is the sphere's volume charge density
A train has a mass of 5.22 ? 106 kg and is moving at 79.0 km/h. The engineer applies the brakes, What is the final speed of the train
An engineer is designing a runway for a new airport. Of the planes which will use the airport, the lowest acceleration rate will be 3 m/s2. Assuming the minimum acceleration, what is the minimum allowed length for the runway
A rock is thrown vertically upward from ground level at time t = 0. At time t = 1.8 s it passes the top of a tall tower, What is the height of the tower
In a cargo plane, the center of gravity must be between the front and rear landing gears in order to maintain a torque equilibrium. Determine the normal force exerted by the ground on the front wheel
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. Find the initial speed of this second balloon
A 72 skydiver can be modeled as a rectangular "box" with dimensions 25 cm*40cm* 1.8m . What is his terminal speed if he falls feet first
The left ventricle of the heart accelerates blood from rest to a velocity of +24 cm/s^2. How much time does it take for the blood to reach its final velocity
q1. a 4 kg fish swimming 3 ms swallows an absent minded 2 kg fish at rest. what is the speed of the large fish
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