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Q. Two 3.0 {rm g} point charges on 1.0-{rm m}-long threads repel each other after being equally charged. What is the charge q?
Q. A soccer player kicks a rock horizontally off a 35.0 m high cliff into a pool of water. If the player hears the sound of the splash 2.84 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
A helicopter is ascending vertically with a speed of 5.45m/s. At a height of 141m above the Earth, a package is dropped from a window. How much time does it take for package to reach the ground.
What is the velocity of the gold pack after the collision. what least average speed must it have in the second half of the event in order to qualify.
A girl rides the escalator that moves foward at a constant speed. As the girl raises, how do her gravitational energy and kinetic energy change.
A light spring with a spring constant of 80.0 N/m rests vertically on a table. A 2g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 5.00 m3 and connected to spring, causing the spring to stretch and expand. How much does the ..
A 2.0 kg ball swings in a vertical circle on the end of an 80cm long string. Calculate the speed, magnitude and direction of acceleration
what is the value of the R that gives zero pressure? write down it in terms of h, W and fundamental constants.
Two cars are travelling on a dirt road between 3 consecutive poles after 5.40s they are side by side at next telephone pole. The distance between the poles is 66.30m.
An asteroid is discovered heading straight toward Earth at 13 . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 , after which the asteroid is moving at 29 to its original path at a speed of 18..
A 1300kg car drives around a flat 190m diameter circular track at 30 m/s. What is the magnitude and direction of net force on the car.
What is the magnitude
An oscillator with a mass of 420 g and a period of 0.900 s has an amplitude that decreases by 1.90 percent during each complete oscillation.
A small rock moves in water and the force exerted on it by the water is given by equation . The terminal speed of the rock is measured and found to be 1.9 . The rock is projected upward at the initial speed of 6.4 . You can ignore the buoyancy for..
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