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An objects average density ? is defined as the ratio of its mass to its volume . The earth's mass is 5.94 ×10^24 kg and its volume is 1.08 ×10^12 km3. What is the earth's average density?
The potential difference between the surface of a 2.5cm -diameter power line and a point 1.6m distant is 4.1kV. What is the line charge density on the power line
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked. how far did they skid
A 7 kg ball is lifted from the ground to a height of 45 meters above the ground. The ball is then dropped. After the ball has fallen 5.5 m, what is it's PE and KE and how fast is it going?
A 1200g model rocket is resting horizontally at the top edge of a 40-m-high wall when it is accidentally bumped, How far from the base of the wall does the rocket land
compute your apparent weight at the top of a Ferris wheel, given that the radius of the wheel is 7.1 , it completes one revolution every 30 , and your mass is 51 .
An athlete swings a ball, connected to the end of a chain, in a horizontal circle. What is the centripetal acceleration of the ball at 8.28 rev/s
A 2-slit experiment is performed with light of wavelength 589nm. Fringes are measured on a screen 1.50m away from the slits, What is the separation between the slit
A charge 2q is located at the origin. A charge -3q is located at x = d, y = 0, z = 0. Where is the electric field zero
Freight trains can produce only relatively small acceleration and decelerations. How far will it travel in each case
A 1.0 kg block is attached to a spring with spring constant 18.0 N/m. While the block is sitting at rest, a student hits it with the hammer and almost instantly gives it a speed of 41.0 cm/s. What is the amplitude of the subsequent oscillations? The ..
Calculate the efficiency of a fossil-fuel power plant that consumes 380 metric tons of coal each hour to produce useful work at the rate of 800 MW
A 1.00 kg chunk of ice at a temperature of 0 C and pressure of 1.0 atm melts completely to water of 0 C. What is the change of the entropy of the ice
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