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Astronauts discover a planet orbiting another star. The mass of the star is 8.10 x 10^30 kg, the mass of the planet is 4.50x10^24 kg. the average distance between the planet and the star is 3.10x10^11 m. what is the force exerted by the star on the planet?
One hockey puck of mass 0.2 kg strikes an identical stationary puck on a frictionless ice rink. what fraction of the energy was lost
A rod 89 cm long moves in a plane perpendicular to a magnetic field of 510. G. The velocity of the rod is perpendicular to its length. Find the speed of the rod
How high above the ground will the ball be when it gets to Julie? (note, the ball may go over Julie's head.) 7) Below is some space to write notes on this problem.
A 30-meter steel tape is correct at a temperature of 20.0(C). The distance between two points, as measured by this tape on a day when the temperature is 5 (C), is 25.970m. What is the true distance between the points?
In soccer, a speed record was set for kicking a soccer ball at 43m/s. If the soccer player kicked the ball from ground level at an angle of 30° from the horizontal, what would be the flight time of the soccer ball? Assume that air resistance is ne..
The air inside a bicycle tire pump has 172 joules of work done on it as 64.8 joules of heat is conducted away from it
In a friction experiment, your wooden plank is horizontal. When a mass of 100 grams is hanging on the weight hanger of mass 50 grams, what is the coefficient of kinetic friction
A lamp (R=150), an electric heater (R=23), and a fan (R=50) are connected in parallel across a123V line. calculate the power is expended in the heater
In one day, a 90kg mountain climber ascends from the 1520m level on a vertical cliff to the top at 2360m, What is her change in gravitational potential energy on the first day
The moon is 3.85Ã-10^8 m from Earth, and it takes 27.3 days to orbit Earth. At what speed is the moon traveling relative to Earth
A plastic cylinder of length 38 cm its ends ground to convex (from the rod outward) spherical surfaces, each having radius of curvature 19 cm, How far will the image of the object lie from the right end
On a planet in a solar system far from ours, you release a rock from rest at a height of 12.0 m above the surface of the planet, What is the mass of the planet
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