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A board of mass 20 kg and length 4 m is supported by two scales, one a t the left end of the board, and the other at 3 m from that end. What is the reading on the scale at the left end?
Two point charges 2.0cm apart have an electric potential energy -400?J . The total charge is 25nC, What is the lesser and larger charge
question1an elevator is being lifted up an elevator shaft at a constant speed by a steel cable. all frictional effects
Three resistors are connected to a in series with a 19 V ideal battery, What is the current coming out of the battery
A laboratory technician drops a 0.0840-kg sample of unknown material, at a temperature of 100.0°C, into a calorimeter. Compute the specific heat capacity of the sample
A horse drags a 100 kg sled a distance of 4 km in 20 minutes. What is the coefficient of sliding friction between the sled and the ground
Two trains on separate tracks move toward each other. Train 1 has a speed of 125 km/h; train 2 a speed of 84.0 km/h. What is the frequency heard by the engineer on train 1
An asteroid is discovered in a nearly circular orbit around the Sun, What is the asteroid\'s orbital period, its \"year,\" in terms of Earth years
You push a 2.7 kg box with a force of 23.8 N along a level floor, but a frictional force of 3.3 N opposes the motion
A plastic film of thickness 290 nm appears to be green (?green = 510 nm), What is the plastic's index of refraction
If a force vector has a magnitude of 2.61 newtons and points 64.5 degrees south of east, then what is its x-component?
If it takes you about 2 minutes to fill your 12 gal (or 0.48 m3) gas tank. Estimate the velocity of the gas as it leaves the nozzle
Consider a bright star in our night sky. Assume its distance from Earth is 45.9 light-years (ly) and its power output is 4.00 multiply.gif 1028 W, Find the power of the starlight the Earth intercepts
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