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Calculate the heat needed at 0 degrees celcius to make the following change of state: kilocalories to melt 140 g of water. (hint) the answer will have 2 SF and if it has trailing zeros write in scientific notation
Two parallel plates are 4.0 cm apart. The bottom plate is charged positively and the top plate is charged negatively, producing a uniform electric field of 5.0 * 10 exp 4 N/C in the region between the plates.
What is the acceleration of two falling sky divers (mass 117.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight
A roller-coaster car has a mass of 1170 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 20 m, its speed is not changing.
A load of bricks with mass = 15.6 hangs from one end of a rope that passes over a small, frictionless pulley. What is the magnitude of the upward acceleration
Billy Dee notes that her favorite record rotates at 34 rev/min. At what speed does the point on the record touching the stylus (needle) move when the stylus (needle) is 5.9 cm from the center?
A bluray disc is 12cm in diameter. When you put it into the player it takes 30 seconds for the disc to accelerate to its playing speed; 1500 revolutions per minute. find number of revolutions the disc makes
How does the frequency of harmonic motion change if we take a spring of seven times the modulus, increases or decreases by a factor of how much
A person with a remote mountain cabin plans to install her own hydroelectric plant. A nearby stream is 3.00 m wide and 0.500 m deep. Water flows at 1.05 m/s over the brink of a waterfall 5.10 m high. The manufacturer promises only 25.0% efficiency..
A constant force is applied to object A and causes it to accelerate5m/s^2. The same force is applied to object B which accelerates 3m/s^2. The same force is applied to object C andit accelerates 8m/s^2.
An electron in a cathode-ray tube is emitted from a hot filament at a negligible speed. , whereupon it accelerates across a potential difference of 1.00 x 106 V. Determine its final speed compared to the classical result.
When two unknown resistors are connected in series with a battery, the battery delivers 235 W and carries a total current of 5.00 A. Determine the values of the two resistors
A hoodlum throws a stone vertically downward with an initial speed of 11.1 m/s from the roof of a building, 26.0 m above the ground. What is the speed of the stone at impact
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