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Why is a solar water heater generally installed with a glasscover on the top to be insulated from the outside air? Compare thesolar energy collecting efficiencies of the solar water heaterswith and without a glass cover, respectively.
Avogadro's number of water molecules has a mass of 18 gram. If we were somehow able to move an electron from one out of every 109 molecules in a gram of water, what would be its charge
Helium is used to fill a balloon of diameter 31 cm at 23C and 1.5 atm. The mass of a helium atom is 4.0026 u, the conversion factor from u to kg is 1.66 × 10?27 kg/u, What is the average kinetic energy of each Helium atom
A 12kg runaway grocery cart runs into a spring with spring constant 210 N/m and compresses it by 70 cm .What was the speed of the cart just before it hit the spring.
A small object is released from rest and falls 1.00 x 10^ 2 feet near the surface of the earth. Neglect air resistance. How long will it take to fall through the 1.00 x 10^2 feet mentioned?
Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 12.1 m/s toward the east, What was the initial speed of the northward-moving vehicle
A closed organ pipe is 0.5m long. If the speed of sound is 340m/s , What is the pipe's fundamental frequency
An undamped 2.23-kg horizontal spring oscillator has a spring constant of 24.3 N/m. What is the oscillator\'s total mechanical energy as it passes through a position that is 0.785 of the amplitude away from the equilibrium position
A. What is the maximum frictional force that the ground can exert on the ladder at its lower end? B. What is the actual size of the frictional force when the painter has climbed 1.2417 m along the ladder?
White light is incident from air onto a triangular prism at a 45 degree angle by respect to the normal. It refracts at the prism then again at the air as it exits the prism. If the prism has an index of refraction of 1.49 for red light and 1.52 for v..
Light strikes a cube with index of refraction (2) at an angle of 30 deg. At what angle will the light exit the cube
Gas is confined in a tank at a pressure of 9.5 atm and a temperature of 24.5°C. what is the pressure of the gas remaining in the tank
An airplane with a speed of 76.6 m/s is climbing upward at an angle of 49.5 ° with respect to the horizontal, Relative to the ground, determine the angle of the velocity vector of the package just before impact
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