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Q. A man pulls a 50.0 kg box at constant speed across the floor with a rope. He applies a 200N force at an angle of 30 degrees. Sum the forces in the x-direction. a) What is the frictional force opposing the motion? b) Sum the forces in the y-direction. What is the value of normal force?
Q. Hakeem throws a 10.50 g ball straight down from a height of 2m. The ball strikes the floor at a speed of 7m/s. What was the initial speed of the ball? Presume that air resistance is negligible.
A uniform magnetic field B is confined to the square region with side of length 2L.
What will be its length and height at rest
After a tornado, a 0.55g straw was found embedded 2.6cm into the trunk of a tree. If the average force exerted on the straw by the tree was 70 N, what was the speed of the straw when it hit the tree.
use the inverse square law to display that in space shuttle territory, 200 kilometers above earth's surface, the force of gravity on a shuttle is about 94 percent of that at earth's surface.
What is the mass of the block on the left. Find this angle of the thread.
A submarine dives 90.0 m at an angle of 8.0° below the horizontal. What are the horizontal and vertical components of submarine's displacement? (Imagine that upward and the direction of the submarine's horizontal motion is positive.)
What are the lowest and the highest frequencies. calculate the acceleration of the crate.
A barge of mass 5x 10^4 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45° to the canal.
A person with a mass of 103 kg is standing on a scale that reads weight in newtons inside of an elevator. If the elevator accelerates upward at 3.2 m/s2, what does the scale read.
What is the maximum speed with which a 1350kg car can round a turn of radius 71m on a flat road if coefficient of static friction between tires and road is 0.40.
What would be the potential difference VC - VB across the thin resistor if the battery emf is 4.00 volts? Suppose that the electric field in the thick wires is very small (so that the potential differences along the thick wires are negligible)
How long did it take for officer to catch up to the car.
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