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A boy pulls a box of mass 30 kg with a force of 25 Nin a direction from left to right.
(a) Ignoring friction of the box, what is the acceleration of thebox?
(b) What is the normal force exerted on the box by the ground?
an organ pipe is 2.0cm long.Assume the pipe is cylindrical with one closed and one open end. if the frequency of the 3rd harmonic is 290Hz,then what is the speed of sound in the pipe
You are standing still and watching a spaceship fly past. How fast is the spaceship moving, relative to you
The range of a projectile depends not only on v0 and ?0 but also on the value g of the free-fall acceleration, which varies from place to place. by how much would his record have differed
The owner of a van installs a rear-window lens that has a focal length of -0.340 m. When the owner looks out through the lens at an object located directly behind the van, How far from the van is the object actually located
A piece of wood is 0.640m long, 0.230m wide, and 7.00×10^?2 m thick. What is the mass of this volume of lead
A pilot, whose mass is 72.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 185 m/s and that the radius of the loop-the-loop is 1.570 km, What is the pilot's apparent weight at the top of the loop-the-loop
a man lost in a maze makes three consecutive displacements so that at the end of his travel he is right back where he
In a tennis serve, a 0.070 kg ball can be accelerated from rest to 36 m/s over a distance of 0.75 m. Find the magnitude of the average force exerted by the racket on the ball
A 76-kg man is at rest on ice skates. A 0.24-kg ball is thrown to him. The ball is moving horizontally at 26 m/s just before the man catches it. How fast is the man moving just after he catches the ball
rotates to provide an "artificial gravity" of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find out the rate of rotation of the wheel (in revolutions per minute) that will produce this effect.
A tank circuit in a radio transmitter is a series RCL circuit connected to an antenna. The antenna broadcasts radio signals at the resonant frequency of the tank circuit. calculate the maximum inductance of the tank circuit
You walk 100 m to the north, and then you turn 70degrees to your right and then walk another 50 m. What is the magnitude of your total displacement
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