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A pitcher throws a 0.140-kg baseball with a speed of The batter strikes it with an average force of which results in the ball traveling with an initial speed of toward the pitcher. For how long were the bat and ball in contact?
You witnessed a hit-and-run accident when you were driving a car at velocity u towards a radio station very far ahead on the street. Here is how it happened: you were listening to the radio when you \saw" a car driving towards you hit a person sta..
Suppose the pressure of the gas equals to p=aV^2, where a is constant. Find the heat transfer to the gas during this process
A person walks 28.5o north of east for 3.62 km. What total distance would he have walked
Consider an isolated metallic sphere of radius R and another isolated metallic sphere of radius 3R. If both spheres are at the same potential, what is the ratio of their potentials
A man and a boy carry a canoe 5.75 m longand weighing 373 N. The canoe is heldoverhead in a horizontal position. The boy holds one end of the canoe. How far from the opposite end should the man stand so that the boy exerts a force of only 126 N?
A room with dimensions 10 x 10 x 20 meters is filled with air at 20 degrees C, 101 kPa and relative humidity 0.8. What is the mass of water vapor in the room, in units of kg
An electron moving in one dimension is confined between two walls seperated by a distance L = 10^-10 m. What is the average force that the electron exerts on the walls
A person on earth notices a rocket approaching from the right at a speed of 0.83c and another rocket approaching from the left at 0.64c. What is the relative speed between the two rockets
A string is wrapped around a pulley of radius 3.05? , and a weight hangs from the other end. What's the angular acceleration of the pulley
A thin soap film (n = 1.32) suspended in air has a uniform thickness. At what angle of incidence will green light (λG = 562 nm) be most strongly reflected
A canon ball shots with an initial velocity of 141 m/s at an angle of 45o follows a parabolic path, what is the speed of the cannon ball when it hits the balloon
If the blood in your finger is flowing east, what is the direction of electric field in the finger due to the hall voltage developed in finger?
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