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A deep-space probe moves away from Earth by a speed of 0.78c. An antenna on the probe requires 4.0 s, in probe time, to rotate during 1.0rev. How much time is required for 1.0 rev according to an observer on Earth?
A current of 3.50 A is carried by a copper wire of radius 0.87 mm. what is the drift speed of the conduction electrons
Suppose you want to run some apparatus that is 85 from an electric outlet. What voltage will be applied to your apparatus
A stone is dropped from the roof of a building; 2.10s after that a second stone is thrown straight down with the initial speed of 18 m/s, and both stones hit the ground at the equal time. How long did it take for the first stone to hit the ground.
A wrecking ball (weight = 4400 N)is supported by a boom, which might be assumed to be uniform and has a weight of 3000 N. As the drawing shows, a support cable runs from the top of the boom to the tractor.
a potential difference of 15v is found to produce a current of 0.44a in a 3.6m length of wire with a uniform radius of
The four tires on the author's car are inflated to an absolute pressure of 2.8 multiply.gif 105 Pa.what is the contact area between each tire and the ground
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.55s , find Through what angle did the pulley turn while accelerating
A charged particle moves in a region of uniform magnetic field along a helical path, What is the speed of the particle as it moves along this path
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1330 Hz. The bird-watcher, however, hears a frequency of 1410 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
A string is rolling several rolls about a solid sphere, and then the sphere leaved to fall from the end of the string. What is the acceleration of the center of the sphere
A length of rope is wrapped around a spool of weight W with inner radius r and outer radius R. The rope is pulled with a tension T at an angle ?. Which of the following conditions must be satisfied for the spool to slide uniformly without rolling? co..
A block of mass M=0.623kg is floating stationary in a beaker of water. What is the magnitude and direction of the buoyant force acting on the block
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