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The sun is 1.4x10^9 meters in diameter, and it is 1.5x10^11 meters from Earth. A pinhole in the leaf of a tree forms an image on the ground that is 1.4 cm (= 0.014 meter = 1.4x10^-2 meters) in diameter. How high above the ground is the leaf containing the pinhole?
In a television, electrons shoot down the picture tube and strike fluorescent material on the screen, causing light to be emitted and producing the picture. assume that a certain set, the electrons are accelerated from rest 2.0 x 10^8 ms-1 in abou..
A 0.160 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. What is the mass of the second ball
A sled rests at the top of a 25° slope 80 m in length. If ?k =.25, and the velocity at the bottom of the incline is 20 m/s, what is the weight of the sled
Compute the number of g's a person would experience if she could stand on the equator of Jupiter. Use following astronomical data for Jupiter: mass = 1.9 multiplied by 1024 kg, equatorial radius = 7.10 multiplied by 104 km, rotation period 9 hr 55 mi..
question a 3.0 g bullet of specific heat 128 jkg.degree c is moving at 180 ms and enters a bag of sand then stops. if
The potential difference between two parallel conducting plates in vacuum is 475 V. An alpha particle with mass of 6.50×10-27 kg and charge of 3.20×10-19 C is released from rest near the positive plate. What is the kinetic energy of the alpha particl..
Pilots can be tested for the stress of flying high-speed jets in a whirling "human centrifuge" which takes 1.0 min to turn through 20 complete revolutions before reaching its final speed. what was its final speed in rpm
Three 15-? resistors are connected in parallel. This arrangement is connected in series with a 10-? resistor. What is the effective resistance of the parallel portion of the circuit
A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 11.5 m/s. How high does she see the ball rise
On Planet X, the pressure at a depth of 2.00 m below thesurface of a liquid nitrogen lake, the pressure is5.00*10^5N/m^2. What is the atmospheric pressure at the surface of the lake
A 76-kg man is at rest on ice skates. A 0.24-kg ball is thrown to him. The ball is moving horizontally at 26 m/s just before the man catches it. How fast is the man moving just after he catches the ball
A 4.0-kg rock is dropped from a height of 21.0 m. At what height is the rock's kinetic energy twice its potential energy? ?? m A cylinder of gas is at room temperature (20°C). The air conditioner breaks down, and the temperature rises to 49°C. Wha..
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