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A ball is thrown downward from the roof of a 24 m tall building with an initial speed of 5 m/s.
(a) Use energy principles to find the speed with which the ball hits the ground.(b) Find the time it took for the ball to reach the ground.(c) If the ball were thrown upwards from the roof with the same speed repeat the calculations for parts (a) and (b).
the plane of a flat, circular loop of wire is vertical. An external B-field is directed perpendicular to the plane of the loop. What is the direction of the external magnetic field
A skier approaches the base of an icy, frictionless hill with a speed of 13.4m/s . The hill slopes upward at 24.0^\circ above the horizontal. Find the acceleration of this skier
A photon with wavelength 0.02585 nm strikes a free electron that is initially at rest. find the kinetic energy of the electron after the collision
A Carnot engine has a power output of 130 kW. The engine operates between two reservoirs at 20°C and 500°C, How much energy does it take in per hour
The frequency of light emitted by a toaster is 2.5 GHz. How many toaster photons are required to heat the water
A sinusoidal wave travels along a stretched string. A particle on the string has a maximum velocity of 0.800m/s, What is the amplitude of the wave
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
Water can hold 36 grams (g) of salt in every 100 milliliters (mL). The ocean contains 3.6 g of salt in every 100 mL. As a solution, which is seawater.
A 6.3 ?C point charge and a ?1.7 ?C point charge are separated by a distance of 0.00034 m. What is the electric potential energy of this system
An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 24.0 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. How long is the nose of the train in the station
While on a one-hour trip, a small boat travels 32 km north and then travels 45 km east. What is the magnitude of the boat's average velocity for the one-hour trip
A 900- kg car collides with a 1300- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car (in km/h)
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