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A 17 cm radius air duct is used to replenish the air of a room9.2 m x 5.0 m x 4.5 m every ten minutes. How fast does the air flowing the duct?
A 2.20 kg frictionless block is attached to an ideal spring with forces constant 314N/m. At first the block has velocity -3.60 m/s and displacement 0.300-m.
Two rocks are thrown off the edge of a cliff that is 15.0 m above the ground. The first rock is thrown upward, at a velocity of +12.0 m/s. The second is thrown downward, at a velocity of 12.0 m/s.
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm (blue). compute the distance between the first-order red and blue fringes
q1. the resistor in a circuit has a resistance of 148 ohms. what capacitance should be used in this circuit if the time
The radar system at an airport broadcasts 15 GHz with 150 kW. An approaching airplane with a 34 m^2 cross section is 24km away. Assume that the radar broadcasts uniformly in all directions and that the airplane scatters microwaves uniformly in all di..
A wooden block of mass 2kg, initially stationary is dragged by a force F with magnitude 20 N along a frictionless incline with an angle 0=30 degrees, What is the wooden block acceleration
The drawing shows a person (weight W = 581 N, L1 = 0.852 m, L2 = 0.402 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot
You are standing at a red light on SW 8th Street at 97th Avenue. The light turns green, find the work done on your car by the frictional force
A copper ball with a radius of 1.47 cm is heated until its diameter has increased by 0.198 mm. Assuming an initial temperature of 21.3°C, calculate the final temperature of the ball
what is the shortest height a plane mirror must be so that a person 1.60 meters tall is able to see his or her whole body.
A rowboat with a mass of 94 kg carries a 61 kg rower and 34 kg of water that has accumulated in the bottom. What is the subsequent speed of the boat
A person opens a door by applying a 17 N force perpendicular to it at a distance 0.90m from the hinges. What was the average power delivered
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