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A cell phone transmits at a frequency of 1.28 108 Hz. What is the wavelength of the electromagnetic wave used by this phone?
m
If an astronaut can throw a certain wrench 14 {rm m} vertically upward on earth, how high could he throw it on our moon if he gives it the similar starting speed in both places.
Drawing on Erastothenes' method, if two observers are due north and south of each other and are separated by 490 km, what is the circumference of their spherical world if they see the same star on their meridian at altitudes of 29 degrees and 45 degr..
Compute the magnitude & direction of the current.
A force does +130J of work while it acts on a moving object and its direction is in the same direction as the object's displacement. How much work does this force do as the angle between it and the object's displacement is 56°.
A 280 g block on a 50.00 cm-long string swings in a circle on a horizontal, frictionless table at 70 rpm.
On a clear day the electric ?eld in the atmosphere near the earth's surface is 100 N/C, What is the potential at the top of a man's head if the man is 2 m tall and is standing
A stone is dropped into a river from a bridge 43.90 m above the water. Another stone is thrown vertically down 1.00 after the first is dropped. The stones strike the water at the same time.
Suppose 0.0450kg of steam (at 100.°C) is added to 0.450kg of water (initially at 20.5°C), Find the final temperature of the water after equilibrium is reached
Assume too that the bullets rebound straight back with no change in speed. What is the magnitude of the average force on Superman's chest from stream of bullets.
what is the new value of energy stored in it. What is the force that is acting between them.
A large truck collides head-on with a small car. The car is severely damaged as a result of the collision. According to Newton's third law, how do the forces acting between the truck and car compare during the collision?
Two wires are parallel and one is directly above the other. Each has a length of 50.0 m and a mass per unit length of 0.020 kg/m. However, the tension in the wire A is 6.20 102 N, and the tension in the wire B is 2.90 102 N.
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