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Radiation can supplement the energy needs of a home's water heater. These systems can be as simple as running the water through black PVC pipes on the roof of the house. Efficiency of 50% in collecting radiation is an ambitious goal, but not impossible. Assume the average solar- energy input is 210 W/m2 and the area of your solar collector is 30.0 m2. Find what volume of water can be heated per hour from a temperature of 16.0oC to a temperature 61.0oC.
A 362 g object is attached to a spring and executes simple harmonic motion with the period of 0.200 s. If the total energy of the system is 6.71 J.
A novice skier, starting from rest, slides down a frictionless 28.00 incline whose vertical height is 170. How fast is she going while she reaches the bottom?
The electric field has been measured to be horizontal and to the right everywhere on the closed box. All over the left side of the box E1 = 120 V/m, and all over the right, slanting, side of the box E2 = 250 V/m. On the top the average field is E3..
The impact with the racket gives the ball a constant acceleration over a distance of 47 cm. Illustrate what is the magnitude of the net force acting on the ball?
Suppose a constant ratio of 13.60 counts per minute per gram of living matter. A sample of a petrified tree was found to give 1.8 counts per minute per gram. How old is the tree.
A bus travelling along the straight road at 100km/hr-1 and the bus conductor make at 6kmhr-1 on the floor of the bus in the same direction on the bus. Find the speed of the conductor relative to road and relative to the bus. If the bus conductor now ..
A helicopter is ascending vertically with a speed of 5.00m/s . At a height of 120m above the Earth, a package is dropped from a window. Evaluate how much time does it take for the package to reach the ground?
A worker pushes horizontally on a large crate with a force of 297 N, and the crate is moved 4.8 m. How much work was done.
The horizontal surface is frictionless and the system is free from rest. Using energy concepts, determine the speed of m3 after it moves down a distance of 6.0 m.
Somewhere between the Earth and the moon, gravity from these two bodies on the space pod would cancel. Is this location nearer the Earth, the moon, or in the middle (having the same distance between) of the earth and the moon.
A person with a mass of 71.6 kg and a volume of 0.089 m3 floats quietly in water. (a) What is the volume of the person that is above the water? If an upward force F is applied to the person, the volume of the person above the water increases by 0...
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. a) What mass of gold is in the rock? b) What percentage of the rock is gold by volume? c) What percentag..
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