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A tunnel under a river is 2km long. At what frequencies can the air in the tunnel resonate? Explain whether it would be a good to make a rule against blowing your car horn when you are in the tunnel.
a 1.8 book is lying on a 0.70 -high table. you pick it up and place it on a bookshelf 2.3 above the floor.1. how much
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 440-g sample of silver at an initial temperature of 85°C is placed in the water. Calculate the mass of the aluminum cup
A 150-lb male athlete is running on a treadmill machine at a speed of 10 mi/hr in a thermally insulated room. How do entropies change in the body of the athlete and in the room
Two sinusoidal waves of the same frequency travel in the same direction along a string. what is the amplitude (in cm) of the resultant wave
A gnat takes off from one end of a pencil and flies around erratically for 26.6 seconds before landing on the other end of the same pencil. find the gnat\'s average speed
A block of wood, with density 780 kg/m3 has a cubic shape with wides 0.330 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. What is the mass of the lead
It's possible to use the ideal-gas law to show that the density of the earth's atmosphere decreases exponentially with height, Determine the value of z0
A 1055 kg van, stopped at a traffic light, is hit directly in the rear by a 800 kg car traveling with a velocity of +2.00 m/s. What is the final velocity of each vehicle
A spacecraft is launched from the surface of the Earth with a velocity of 0.480c at an angle of 50.0° above the horizontal positive x axis. Determine the magnitude and direction of the velocity of the first spacecraft as measured by the pilot of the..
Estimate how long it will take for the bleach molecules to diffuse through the extent of the room, assuming that the bleach bottle is in the center of the room, and the room is perfectly square, and is a 10 foot x 10 foot room.
An object acted on by three forces moves with constant velocity. Find the magnitude of the third force acting on the object
A baseball (mass 0.14 kg, radius 3.7 cm) is spinning with an angular velocity of 55 rad/s. what is the ratio of its rotational and translational kinetic energies
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