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According to highly accurate GPS-measurements , the continent of North America is drifting with a speed of 1cm/year. Assuming a continent is about 50 km thick, estimate the kinetic energy the continental US has.
You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 273 N for 7.2 s, What is the work done by friction
Suppose a ball player throws a ball at an angle of 55 degrees and a speed of 25 m/s. Next to the ball thrower, What is the distance the ball is thrown
A person with perfect pitch sits on the bus bench listening to the 442 Hz horn of an approaching car. If the person detects a frequency of 479 Hz, how fast is the car moving.
If both of them are simultaneously plucked at the center, illustrate what is the frequency of the beats that they will produce when vibrating in their fundamental?
Two loudspeakers, 5.0 m apart and facing each other, play identical sounds of the same frequency, What is the frequency of the sound (in Hz)
At first the spacecraft and the asteroid are at rest, 450m apart. How much time does it take for the ship and the asteroid to meet?
A hydrogen atom consists of a single proton and a single electron. Experimentally it is found that it takes 13.6eV of energy to strip the electron from the proton. calculate the size of the hydrogen atom
A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.1 kg and the sign has a mass of ms = 16.6 kg. What is the net force the hinge exerts on the beam
Two 2.30 cm x 2.30 cm plates that form a parallel-plate capacitor are charged to +- 0.714nC. Part A What is the potential difference across the capacitor if the spacing between the plates is 1.00mm? Part B What is the potential difference across t..
You are at the controls of a particle accelerator, sending a beam of 3.90×107m/s protons (mass m ) at a gas target of an unknown element. What is the speed of the unknown nucleus immediately after such a collision
However, as the drawing shows, a plane mirror reflects light from the bird into your camera. If x = 4.2 m and y = 3.9 m in the drawing, for what distance must you set focus of the camera lens in order to snap a sharp picture of the bird's image.
Two long, straight wires are parallel and are separated by a distance of d = 0.230 m, The top wire in the sketch carries current I1 = 3.80 A, toward the right, and the bottom wire carries current I2 = 7.00 A, what are the magnitude and direction of t..
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