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Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person's voice was so loud in the astronaut's space helmet that it was picked up by the astronaut's microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light (3.00×10 8 m/s) .
A 5 kg block, measuring 10 cm per side, is held 50% submerged in water by a Helium balloon. If the density of Air is 1.18g/L, what is the diameter of the balloon
A Ball begins rolling at the left and has just suffient energy to climb up to point C, which is the top of the hill on the right
A machine has an 650 g steel shuttle that is pulled along a square steel rail by an elastic cord (see figure below). The shuttle is released when the elastic cord has 16 N tension at a 45° angle
Find out the rate of the wheel's rotation in revolutions per minute that will produce this effect.
The spring is aligned with the plane and has a spring constant of 133 N/m. Explain how much does the spring stretch?
A muon is created at the top of Mount Nanga Parbat (height 8,100 m) and travels at constant speed to sea level, what is the height of Mount Nanga Parbat
A battery with an emf of 12.0 V shows a terminal voltage of 11.8 V when operating a circuit with four light bulbs each rated at 4 W (at 12.0 V) which are connected in parallel. What is the current in each bulb
Physics - Classical Mechanics - Inclined Plane, A packing crate is placed on a plane inclined at an angle of 350 from horizontal. If the coefficient of static friction
To make an order-of-magnitude estimate of the energy level spacings in the nucleus, Calculate the energy of the ground state
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.
A 16 kg steel ball is launched from a cannon at an angle of 20 degrees above the horizontal. The cannon exerted an average force of 1200 Newtons on the ball during launch. Now that ball is in the air and has almost reached its target, what is the ..
Light inside an optical fiber tube hits the wall between the tube and air. What is the index of refraction of the tube
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