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Pennies today are copper-covered zinc, but older pennies are 3.4g of solid copper.
What are the total positive charge and total negative charge in a solid copper penny that is electrically neutral?
How much work did movers do (horizontally) pushing a 150-{rm kg} crate 10.6 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50.
A school bus takes 0.89 h to reach the school from your house. If an average velocity of the bus is 21.1 km/h to the east, what is the displacement.
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed, What is the magnitude of the tension in the string when the ball is at the bottom of the circle
What fraction of incident intensity is transmitted by system
Three astronauts, propelled by jet backpacks, push and guide a 115 kg asteroid toward the processing dock, exerting the forces, with F1 = 34 N, F2 = 57 N, F3 = 41 N, θ1 = 30°, and θ3 = 60°
What is an average speed
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
A horizontal 797N merry-go-round is a solid disk of radius 1.53 m, started from rest by a steady horizontal force of 50.4 N applied tangentially to the edge of disk. Determine the kinetic energy of the disk after 3.06 s.
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
What is the intensity of the sound waves at point.
A classroom slide projector projects an enlarged (55 times taller) image of a 24 mm high photographic film onto a screen located 10 meters from the projector. What focal length lens (cm) does slide projector require to produce a sharply focus imag..
What was the initial negative charge on one of the spheres, and what was the initial positive charge on the other?(Hint: Use charge conservation and solve for one of the initial charges. You will end up with a quadratic equation. The solutions giv..
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