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A car moving at 35 m/s approaches a stationary whistle that emits a 220Hz sound. The speed of sound is 343m/s. What is the frequency of sound heard by the driver of the car?
Unpolarized light with an intensity of 875 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
When point charges q1 = +7.7 µC and q2 = +5.7 µC are brought near each other, Determine the distance between the charges
You need to connect a 43k\Omega resistor and one other resistor to a 110 \rm V power line. what should be the value of the unknown resistor
Two slits spaced 0.500mm apart are placed 77.0cm from a screen. What is the distance between the second and third dark lines
A student drops two metallic objects into a 120-g steel container holding 150 g of water at 25°C. What is the mass of the aluminum chunk
A uniform disk with a mass of 813g and a radius of 17cm is rotating on frictionless bearings with a rotational speed of 18Hz, what is the new rotational speed of the disk
A freezer is comprised of 1.80x1x0.5 m^3 volume, insulated with 5 cm thick Styrofoam. (1) At what rate should the compressor remove heat to maintain the inside at - 20 degrees Celsius with the outside at room temperature. (2) What is the R-value o..
A proton moving at 4.30 106 m/s through a magnetic field of 1.75 T experiences a magnetic force of magnitude 8.04 10-13 N
Helium gas with a volume of 2.60L under a pressure of 1.70atm and at a temperature of 43.0 oC is warmed until both the pressure and volume of the gas are doubled. How many grams of helium are there
Two rockets approach earth from opposite directions at equal speeds relatie to the earth, How fast are the rockets going with respect to earth
Water is moving at a speed of 7.55 m/s through a fire hose with an internal diameter of 5.99 cm. What is the diameter of the nozzle
A player passes a basketball to another player who catches it at the same level from which it was thrown. The initial speed of the ball is 8.1 m/s, What was the initial direction of the ball
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