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A room measures 3.0 m by 4.5 m by 6.0 m. If the heating and air-conditioning ducts to and from the room are circular with diameter of 0.30 m and all the air in the room is to be exchanged every 12 min,
(A) what is teh average rate of flow?
(B) WHat is the necessary flow speed in the duct? (Assume that the density of the air is constant).
Water is flowing through a pipe (area 3.7 cm2) that connects to a faucet adjusted to have an opening of 0.45 cm2. what is its speed as it leaves the faucet
A 2.41 kg block and a 4.82 kg block are initially at rest on a frictionless, horizontal surface, with a compressed spring of negligible mass between them. How much does the kinetic energy of the system increase
An 8kg mass is observed traveling with a speed of .08*c. What is the relativisitic momentum
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. It vibrates with a fundamental frequency of 27.4 Hz. What is the total mass of the wire
The suspension system of a 1800 kg automobile "sags" 14 cm when the chassis is placed on it. Estimate the values of the spring constant
A charge of 2.05mC is placed at each corner of a square 0.160m on a side. Determine the magnitude of the force on each charge
The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At what temperature will the gap be closed
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20 ^circC? Suppose that the air bubble is always in thermal equilibrium with the surrounding water.
A current of 2.50 A passing through a heating coil immersed in 180 g of paraffin (specific heat capacity 2.00 jg^-1K^-1) raises the temperature from 5 c below room temperature to 5 c above room temperature in 100 seconds
A disk of radius 10 cm, initially at rest, begins rotating about its axis with a constant angular acceleration of 8.2 rad/s2. compute the angular velocity of the disk
If a bullet is fired vertically upwards with the speed calculated in (b), what is the maximum height that the bullet can reach.
The electric field on the axis of a uniformly charged ring has magnitude 350kN/c at a point 6.0cm from the ring center. Find the rings charge in nC
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