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A child on a sled reaches the bottom of a hill with a velocity of 10.0m/s and travels 25.0m along a horizontal straightaway to a stop. If the child and sled together have a mass of 60.0kg, what is the average retarding force on the sled on the horizontal straightaway?
A 2.94g aluminum bullet at 31.0°C is fired at a speed of 236 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts
A flywheel with a moment of inertia of .15 kgm2, is on a motor that puts out 2.4 Nm of torque. How many rotations will the wheel make by the time it reaches a speed of 1500 rpm
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.1 cmfrom the origin O. For each of the situations in the drawing, determine the magnitude of the net electric field at..
Let I1 be the branch current though R1, I2 be the branch current through R2, and I3 be the branch current through R3. Write Kirchhoff?s loop rule relation for a loop that travels through battery 1, resistor 1, and resistor 3. (Use a clockwise curr..
A paratrooper fell 370 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.1 m deep, find the work done on him by air resistance as he fell
A metal wire of resistance R is cut into three equal pieces that are then braided together side by side to form a new cable with length equal to one-third of the original length
find the maximum acceleration of the tip of a prong
an electric dipole consisting of charges of magnitude 1.90 nc separated by 8.80 microm is in an electric field of
One block (m1= 250g) is on a smooth table and connected to amassless string. The string continues over a massless,frictionless, pulley and down towards another block (m2=50.0g) thathangs from the table at the other end of the same string.
Hans and Franz pick up the 2.0m long garden. The chair weights 200 N and the center of gravity is 80 cm from Hans end. How much weight does Hans have to lift
John is sitting ( at rest) at the top of a slide that is inclined 25 deg with respect to the horizontal. how much does the thermal energy increase during John's trip down the slide
a ball is suspended from 3.0 m long cable that makes a 30degree angle with vertical. Ball is released and swings down. What is ball's speed at lowest point
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