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The acceleration due to gravity of a particle falling toward the earth is a = -gR2/r2, where r is the distance from the center of the earth to the particle, R is the radius of the earth, and g is the acceleration due to gravity at the surface of the earth. If R = 3960 mi, calculate the escape velocity, that is, the minimum velocity with which a particle must be projected upward from the surface of the earth if it is not to return to earth.
A person walks first at a constant speed of 4.80 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.75 m/s. What is her average velocity over the entire trip
When a mass of 25 g is attached to a certain spring, it makes 19 complete vibrations in 4.5 s. What is the spring constant of the spring
Water is moving at a speed of 7.55 m/s through a fire hose with an internal diameter of 5.99 cm. What is the diameter of the nozzle
A thin, uniformly charged spherical shell has a potential of 720 V on its surface. Outside sphere, at a radial distance of 29.0 cm from this surface, the potential is 434 V.
How much energy would be required to break a helium nucleus into its constituents, two protons and two neutrons? The rest masses of a proton
What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 26 km/h and the μs between tires and track is 0.34?
A rescue helicopter lifts a 85 kg person straight up by means of a cable. How much work is done by the tension in the cable
The earliest capacitors, called "Leyden jars" were made by wrapping conducting metal foil inside and outside glass jars. how tall would the jar have to be to reach a capacitance of 21.0 nF
the magnitude of the drag force on a 20.0-kg object is proportional to its speed. the object has a terminal velocity 80
An object is thrown upwards with a speed of 13 m/s. How long does it take to reach a height of 4.0 m above the projection point while descending?
A particular eye has a focal length of 2.0 cm instead of the 2.2 cm that would put a sharply focused image on the retina. Is this eye nearsighted or farsighted? What type of corrective lens is needed for the eye in the previous question?
An astronaut is traveling in a space vehicle that has a speed of 0.480c relative to Earth. The astronaut measures his pulse rate at 76.0 per minute. What pulse rate does the Earth observer measure
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