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Q. A grindstone of a radius 4 m is firstly spinning with a radius of 8 rad/s. The angular speed is then increased to 12 rad/s over next 4.0 seconds. Suppose that the angular acceleration is constant. What is the average angular speed of grindstone?
Q. A string under a tension of 76 N is used to whirl a rock in a horizontal circle of radius 3.8 m at a speed of 21.84 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.494 m long and the speed of the rock is 70.3 m/s, the string breaks. What is the breaking strength of the string?
suppose that we could use the energy released when 5 g of antimatter annihilates 5g of matter to lift a mass 3 km from the Earth's surface. how much mass can we lift? answer in unites of kg.
A 600 turn solenoid, 25 cm long, has a diameter of 2.3 cm. A 10 turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 5.0 A in 0.55 s, what would be the induced emf magnitude in t..
Three astronauts, propelled by jet backpacks, push and guide a 115 kg asteroid toward the processing dock, exerting the forces, with F1 = 34 N, F2 = 57 N, F3 = 41 N, θ1 = 30°, and θ3 = 60°
On a hot summer day in the state of Washington while kayaking, I saw several swimmers jump from a railroad bridge into the Snohomish River below. The swimmers stepped off the bridge, and I estimated that they hit the water 1 s later.
An iguana that is slowing down at a uniform rate of acceleration while moving in positive direction.
What is the minimum pressing force that must be used.
An uncharged spherical conducting shell surrounds a point charge - q at its centre. Then a charge +3q is placed on the outside surface of shell.
With what minimum speed should you toss a 140g ball straight up to hit the 11.0m-high roof of the gymnasium if you release the ball 1.30m above the ground? Resolve this problem using energy.
Find out the magnitude of angular acceleration of the wheel
An 1150-kg car pulls a 450-kg trailer. The car exerts a horizontal force of 3,800 N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.15 for the trailer.
A stone has a mass of 4.00 x10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.76.
Find out the magnetic induction at a point
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