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You drop a stone down a well that's 9.5m deep. How long until you hear the splash? Assume the speed of sound in air is 343m/s.
Consider a bird that flies at an average speed of 10.7 m/s and releases energy from its body fat reserves at an average rate of 3.70 W, How far will the bird fly before feeding again
Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 is 3.7 kg and m2 is 9.0 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor.
Two bugs are buzzing with the same frequency of 186Hz. One of the bugs is flying away from a stationary observer at 9.0m/s, What is the beat frequency that the observer hears
A machine gun fires 23 g bullets horizontally at 260 m/s at a constant rate of 30 bullets/s. what is the average force exerted on the door
An unknown nucleus has twice the volume of a nucleus with 62 nucleons. What is the atomic mass number of the unknown nucleus
An electric train operates on 740 V. What is its power consumption when the current flowing through the train's motor is 1,970 A
The string connecting the m1 and the m2 passes over a light frictionless pulley. Find the downward acceleration of m2 mass.
A dog with a mass of 20 kg is sitting on a board with a mass of 5 kg. The board is on ice and is free to slide without friction. What is the resultant velocity of the board
A very thin bubble is floating in air. If the bubble strongly reflects green light (? = 520 nm), what is the minimum possible thickness of the bubble
Two tiny spheres of mass 6.80 mg carry charges of equal magnitude, 72.0 nC, but opposite sign. Which ball (the one on the right or the one on the left ) has positive charge ? What is the magnitude E of the field
A 10-m-long glider with a mass of 780kg(including the passengers) is gliding horizontally through the air at 30m/s when a 70Kg skydiver drops out by releasing his grip on the glider. What is the glider's speed
q1. a 1000 rm kg wrecking ball hangs from a 15 rm m-long cable. the ball is pulled back until the cable makes an angle
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