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Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to the Moon. The sound spoken by the person on Earth was transformed into a radio signal sent to the Moon, and transformed back into sound on a speaker inside the astronaut's space suit. This sound was picked up by the microphone in the space suit (intended for the astronaut's voice) and sent back to Earth as a radio echo of sorts. If the round-trip time was 2.60 s, what was the approximate distance to the Moon, neglecting any delays in electronics?
A high speed proton collides with a proton at rest, two proton-antiproton pairs were created. That is some of the accelerated protons kinetic energy was enough to be converted into the mass of the new particles. If the proton-antiproton pairs move al..
An elephant that has a mass of 7000 kg evenly distributes her weight on all four feet. estimate the pressure on each foot
A satellite of mass 4500 kg orbits the Earth(mass = 6.0 1024 kg) and has a period of 5800 s. Find the magnitude of the Earth's gravitational force on the satellite
a boy is laying on a sled wich is on an ice covered hillinclined at an anlge of 15 degrees if the boy and the sled have acombned mass of 54kg what is the force pulling them down the hill
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 300 kg) that is also at rest. Determine the velocity of the second log if the lumberjack comes to rest on it
A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.20 mm. by the length of the barrel set at29.0 cm, the diameter of a red blood cells image subtends an angle of 1.43 m rad with the eye.
A brick is released with no initial speed from the roof of a building and strikes the ground in 2.70 {rm s}, encountering no appreciable air drag. How tall is building? How fast is the brick moving just before it reaches the ground.
When a "dry-cell" flashlight battery with an internal resistance of 0.37 ? is connected to a 1.56-? light bulb, Find the ratio Pwet/Pdry of the power delivered to the bulb by the wet-cell battery to the power delivered by the dry-cell battery
Equal masses of wood and metal are heated to the same temperature and then tossed into two seperate bowls containing the same amount of ice. Which will melt more ice
Determine the internal normal force, shear force, and moment at points D and E in the overhang beam. Point D is located just to the left of the roller support at B, where the couple moment acts
A non-uniform flask consists of a lower portion that is a circular cylinder 20 cm in radius and 20 cm high. The upper portion is also a circular cylinder, which is 2 cm in radius and 40 cm high.
Two metal spheres, each of mass 20 g and initially at rest, are dropped from a height of 9 m in an evacuated chamber. Find the difference in final speeds of the two spheres
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