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Q. What is an average magnitude of the Pointing vector 5.0miles from a radio transmitter broadcasting isotropically with an average power of 250-kW?
Q. A satellite is in circular orbit 230-km above the surface of the Earth. It is observed to have a period of 89 min. What is the mass of Earth? (The mean radius of the Earth is 6.38 × 106 m.)
A tow truck pulls a car 5.2 km along a horizontal roadway using a cable having a tension of 790.
A driver in a car travelling at the speed of 78 km/h sees a cat km away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m.
How many protons hit the target. How much energy is delivered to the target each second if the protons each have a kinetic energy of 30 MeV and lose all of their energy in the target.
At what height above the surface of the earth does the balloon have a velocity of 8.10 m/s.
According to legend, to determine whether the king's crown was made of pure gold, Archimedes measured the crown's volume by find out how much water it displaced. The density of gold is 19.3g/cm^3. If the crown's mass was 6.00 * 10^2g, what volume ..
A copper rod (length=2 m, radius=3×10-3 m) hangs down from the ceiling. A 9.0-kg object is attached to the lower end of the rod. The rod acts as a "spring," and the object oscillates vertically with small amplitude. Ignoring the rod's mass, determ..
An air-track glider attached to a spring oscillates between the 15 {rm cm} marks and the 57 {rm cm} mark on the track. The glider completes 10 oscillations in 32 {rm s}.
compute the electric flux through a rectangular plane.
Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 15.0 cm) 10.0 cm away from an object. Find the image distance and the magnification. explain the image that he observes.
Electrons which were initially at rest were subjected to a continuous force of 2×10-12 newton along the entire length of two miles (one mile is 1.6 kilometers) and reached speeds very near the speed of light.
A tuning fork of unknown frequency is noted to be higher than one marked 512 hz and lower than one marked 1000 hz. You discover resonance points at .11 m and .53 m. Using 347 m/s for speed of sound what is the frequency of the new fork.
find the velocity of their center of mass before the collision.
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