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A simple magnifying glass can focus sunlight enough to heat up paper or dry grass and start a fire. A magnifying glass with a diameter of 4.2 cm has a focal length of 5.9 cm. The mean distance of the Sun from the Earth is 1.50 1011 m. The mean radius of the Sun is 6.96 108 m.
If the intensity of the Sun falling on the magnifying glass is 0.85 kW/m2, what is the intensity of the image of the Sun?
from the top of a pole 4.8m about the ground, he was able to leave the pole with a speed of 4.82m/s at an angle of 7 degrees from vertical, find th total horizontal distance traveled for the vault
A performer seated on a trapeze is swinging back and forth with a period of 8.85 s. what will be the new period of the system
The position of a 2.6 kg mass is given by x = (2t^3-4t^2), where t is in seconds. What is the net horizontal force on the mass
Carlos weighs 900N on the surface of the earth. How much would he weigh in the satellite circling earth at an altitude of 3200km? (The earth's radius is 6400 km)
A system does 4.30 104 J of work, and 7.00 104 J of heat flows into the system during the process. Find the change in the internal energy of the system
A wave pulse travels down a slinky. The mass of the slinky is m = 0.85 kg and is initially stretched to a length L = 6.5 m. What is the speed of the wave pulse
This procedure has actually been used to "weigh" astronauts in space. A 42.5-\rm kg chair is attached to a spring and allowed to oscillate. What is the mass of the person
A 34.4-kg crate rests on a horizontal floor, and a 71.8-kg person is standing on the crate. Determine the magnitude of the normal force that the floor exerts on the crate
basic terminology click geometry in the upper left-hand view.airfoil the wing.leading edge the forward rounded part of
The primary coil of a transformer has N1 = 1.50 102 turns, and its secondary coil has N2 = 5.00 101 turns. what rms voltage is developed across the secondary coil
An x-ray tube accelerates electrons from rest at 5.0×10 14th m/s(squared) power through a distance of 20cm . (Such high accelerations are possible because electrons are extremely light.) Find the electrons'velocity after this acceleration. Find th..
When the three blocks in the figure below are released from rest, they accelerate with a magnitude of 0.740 m/s2, What is the coefficient of kinetic friction between block 2 and the table
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