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A net force of 30 N accelerates a 6 kg mass over a distance of 12 m.
(a) What is the work done by this net force?
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(b) What is the increase in kinetic energy of the mass?
What was an initial speed of the ball
As part of a safety investigation, two 1900 {rm kg} cars travelling at 19 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 {rm s} to stop, and (b) car that hits a..
A cube of ice is taken from the freezer at -8.4 and placed in a 104 aluminium calorimeter filled with 322 of water at room temperature of 20. The final situation is observed to be all water at 17.
Adjacent antinodes of a standing waves on the string are 15.2 cm apart. A particle at an antinode oscillates in simple harmonic motion with amplitude 0.850 cm and period 0.0750 s. The string lies along the x axis and is fixed at x = 0.
A neutron star has a mass of 2.20 × 10^30 kg (about the mass of our sun) and a radius of 5.20 × 10^3 m. Assume an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.0083 m.
A block with mass m = 4 kg is sitting on the ground and not moving. The acceleration due to gravity is g = 9.81 m/s2. Please answer the following questions.
A speedboat starts from rest and accelerates at +2.42 m/s2 for 8.71 s. At the end of this time, the boat continues for an additional 4.33 s with an acceleration of +0.654 m/s2. Find the total displacement of the boat
A football is kicked straight up into the air; it hits the ground 3.4s later. What was the greatest height reached by the ball? With what speed did it leave the kicker's foot
A destroyer sends a sonar pulse out to detect a submarine directly below the ship in the ocean. If the speed of sound in what is 1517 m/s and it takes 64.13 s for the return pulse to hit the hydrophone on the bottom of the ship, how deep is the su..
Five clocks are being tested in a laboratory. Exactly at noon, as determined by the WWV time signal, on successive days of a week the clocks read as in the following table.
Four point charges, q, are fixed to the four corners of a square that is 11.2 cm on a side. An electron is suspended above a point at which its weight is balanced by the electrostatic force due to the four point charges, at a distance of 11 nm abo..
A point source of source emits a tone with a power of 45 W that has a frequency of 429 Hz. calculate the pressure amplitude in Pascals of the sound
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