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An astronaut is traveling to the Moon at a speed of 0.57c. When his spacecraft is 1.9*108 m from the Moon, there is an explosion on the Moon. How long does it take for light from the explosion to reach the astronaut as gauged on the astronaut's clock?
In a downtown office building you notice each of the four sections of a rotating door has a mass of 85 kg. What is the width of each section of the door if a force of 64 N applied to the outer edgE
A certain string just breaks when it is under 25 N of tension. A boy uses this spring to whirl a 0.75kg in a horizontal circle of radius 2.0m. At approximately what speed will the string break
calculate the ratio of the drag force on a jet flying at 800 kmh at an altitude of 8.0 km to the drag force on a
A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12 m/s upward. What is the change in momentum of the ball
Party stores sell small tanks containing 40 g of helium gas. If you use such a tank to fill 0.012 m^3 foil balloons, how many balloons can you expect to fill
What is the smallest thickness of a soap film that would appear black if illuminated with 470 nm light? Assume there is air on both sides of the soap film
A spaceship is measured to be 120 m long while it is at rest with respect to an observer. If the spaceship now flies past the observer with a speed of .99c, what length would the observer measure of the spaceship.
The Houston Astrodome encloses a ground area of 37,000 m^2. Find the flux through the dome of the earth's magnetic field
an electric dipole consists of 3e charge and a -3e charge that are a fixed distance apart. when the 3e charge located
A 20-mC charge is 4 cm above an unknown charge q. The electric intensity at a point 1 cm above the 20-mC charge is 2.20x109 N/C and is directed upward. What are the magnitude and sign of the unknown charge?
Two loudspeaker, 4.0 m apart and facing each other, play identical sounds of the same frequency. You stand halfway between them, where there is a max. of sound intensity. moving from this point toward one of the speakers, you encounter a min. of s..
a component with a 44 ohm resistor is rated for use at power levels not exceeding 2451 mw. how much current can safely
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