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The traffic light turns green and you start speeding up your car from rest at constant acceleration. In the first 5.3 seconds, your car moves 122meters. How far did it move in the first 2.46seconds?
Your 85-kg friend (modeled in the picture as a box) is a window-washer and leans a ladder against a large frictionless window. What is the force from the wall on the ladder
An electron and a positron, each moving at 3.0 x 10^5m/s, collide head on, disappear, Determine the energy and momentum of each photon
1.a bicycle tire is filled to a pressure of 4.42 atm 65 psi at a temperature of 120c. if the temperature of the tire
A box of unknown mass is sliding with an initial speed vi = 5.90 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 2.10 m long. determine the final speed of the box after sliding across the rou..
A magnifying glass is a single convex lens with a focal length of f = +13.0 cm.
In a large centrifuge used for training pilots and astronauts, a small chamber is fixed at the end of a rigid arm that rotates in a horizontal circle. How long is the arm of the centrifuge
a 15 kg hoop of radius 1 m is spinning at a rate of 4 rotations per second, What is the speed in rotations per minute
The potential energy stored in the compressed spring of a dart gun, Find by how much is the spring is compressed
A skier of mass 64 kg is pulled up a slope by a motor-driven cable. What power (expressed in hp) must a motor have to perform this task
A large tower clock like Big Ben, the Parliment Clock in London, has an hour hand 2.70 m long with a mass of 54.5 kg, Calculate the total rotational kinetic energy of the two hands
A person takes a trip, driving with a constant speed 90 km/h except for a 15 minute rest stop. If the person's average speed is 45 km/h, how far does the person travel
A laser produces an average power of 5.5 W in a light beam 1.0 mm in diameter. Find the peak electric field of the laser light
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