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A girl pulls a 26 kg block 6.44 m along a level floor at constant speed with a horizontal force. If the coefficient of kinetic friction between block and floor is 0.25 , what is (a) the work done by the girl's force and (b) the increase in thermal energy of the block-floor system?
each second 5e23 nitrogen molecules (m=4.65e23 g) collide with a 10cm2 wall assume that the molecules all travel with a common speed of 290m/s, What is the pressure on the wall
The catapult of the aircraft carrier USS Abraham Lincoln accelerates an F/A-18 Hornet jet fighter from rest to a takeoff speed of 77.33 in a distance of 93.57 . suppose constant acceleration.
an object 5.00 mm tall is placed 6.00 cm to the left of a converging lens of focal length 20.0 cm.a how far away from
Two children standing on opposite sides of a merry-go-round are trying to rotate it. They each push in opposite directions with forces of magnitude 10.0 N. How fast is the merry-go-round rotating after 4.0s
While two forces act on it, a 10 kg particle is to move at a constant velocity v=(6.8m/s)i +(5.2m/s)j. One of the forces is F1=(4.1N)i +(18.5N)j. What is the j component of the other force
An electron and a positron (an antielectron) make a head-on collision, each moving at v=0.99999c. What is the kinetic energy of each of the muons
What is the wavelength separation of the two fine structure lines that arise from transitions between the first excited state and the ground state?
A 115.08 g ice cube at -15°C is placed in an aluminum cup whoseinitial temperature is 74°C. What is the mass of the cup
at t 0 two flat slabs each 5 cm thick one at 0 degrees and one at 20 degrees are stacked together and then the
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision and are going 10 m/s after the collision. If they skid for 8.2seconds before stopping, how far did they skid? Hint: Are the a..
A pipe with a diameter of 2.88 cm is carrying 134 liters/minute of water with an overpressure (gauge pressure) of 3.65 atmospheres. Find the overpressure of the water in the pipe at the top of the building
A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.55Hz, Ignoring the mass of the spring, what is the mass m of the fish
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