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A constant force of 46.3 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.09 m. Calculate the work done by the force.
A laser used in eye surgery emits a 3.08 mJ pulse in 1.04 ns, focused to a spot 32.4 um in diameter on the retina. Calculate (in SI units) the power per unit area at the retina
A vented tank of large cross-sectional area has a horizontal pipe .12m in diameter at the bottom. The tank holds a liquid whose density is 1500 kg/m^3 to the height of 4.0 m.
Neglect air resitance. Find rocket's kinetic energy when the rocket is 1000 km above Earth's surface. Illustrate what is the max heigh that the rocket reaches.
A 3000 pound car crashes into a concrete jersey barrier moving 3 sections (totaling 12,000 pounds) laterally 24 inches. How fast was the car going on impact.
A railroad car of mass 2.52 x10^4 kg, is moving with a speed of 3.94 m/s. It collides and couples with three other coupled railroad cars, each of the equal mass as the single car and moving in the equal direction with an initial speed of 1.97 m/s.
A 5 kg ball is dropped and hits the ground with a velocity of 14 m/s. using the law of conservation of energy, what height was it dropped from
The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? assume that the only force acting during the collision is that due to the ground.
What is the relationship between the light emitted by an atom and the energies of the electrons in the atom?
A pair of slits separated by d = 1.30 mm is illuminated with light of = 610 nmwavelength and falls on a screen L = 2.00 m away. what was the minimum glass thickness
Furthermore, describe any differences in kinetic energy and gravitation potential energy among these balls while they hit the ground.
A charge of 910 C was passed through a wire in 3.10min. What was the average electric current during that interval
An alpha particle (m = 6.7 x 10^-27kg, q = +3.2 x 10^-19C) has a speed of 30km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out the electric potential difference.
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