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Question: A grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. The angular speed is then increased to 12 rad/s overthe next 4.0 seconds. Assume that the angular acceleration is constant.
What is the magnitude of the angular acceleration of the grindstone?
A sphere that is a perfect blackbody radiator has a radius of 0.120 m and is at 200°C in a room where the temperature is 20°C. Calculate the net rate at which the sphere radiates energy
Suppose you carry a bag of groceries weighing 103 N from your car to your kitchen, a distance of 53 m, without raising or lowering the bag. What is the work done by the force you exert on the bag
Two boxes are seen to accelerate at the same rate when a force Fis applied to the first box and 4F is applied to the secondbox. What is the mass ratio of the boxes?
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, what is the mass of one cubic meter of the atmosphere
In a transformer, the voltage across the primary coil is 120 V rms, and the voltage across the secondary coil is 10 kV rms (i.e. 10 000V). What is the impedance of the secondary coil
question the 6.0 kg object below is released from rest at a height of 5.0 m on a curved frictionless ramp. at the foot
A pot of hot water is boiling on your stove. The pot is in the shape of a round cylinder made of aluminum which is 10 cm in radius. calculate the change in entropy of the boiling water
Two forces act on a 3.4 kg box. One of the forces is known to be F= 5.5 N. The acceleration is measured to be A= (-1.9i - 2.7j ) m/s2. Find the second force as a magnitude and direction
A very slippery ice cube slides in a vertical plane around the inside of a smooth, 20 cm diameter horizontal pipe. Find an algebraic expression for the ice cube's speed
On a frictionless air track, a 0.140 kg glider moving at 1.35 m/s to the right collides with and sticks to a stationary 0.245 kg glider. What must be the net momentum of this system after the collision
Carbon disulfide (CS2) has a vapor pressure of 300 Torr at room temperature (almost half of atmospheric pressure). estimate the average time between collisions
The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n = 5 energy level from/to higher energy levels
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