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Bart Simpson is coasting to a stop on his skateboard. His mass plus the mass of the skateboard is 60kg. The coefficient of friction between the skateboard and the road is 0.4.
part a) Draw a free-body diagram for the skateboard
part b) Find the frictional force acting on the skateboard
part c) Find his acceleration
part d) If his initial velocity was 10 m/s, how much time did it take him to come to a stop
In a real turbine, the entropy of the steam will increase somewhat. How will this affect the percentages of liquid and gas at point 4 in the cycle? How will the efficiency be affected?
A certain conductor has 7.60 1028 free electrons per cubic meter, a cross-sectional area of 4.00 ? 10-6 m2, Find the drift speed of the electrons in the conductor
A 1,220-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9,500-kg truck moving in the same direction at 20.0 m/s, how much mechanical energy is lost after the collision
A 1070-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam.
Find the flow distribution of water in the branching system using a trial method. Assume for all pipes f ¼ 0.02. The pump curve is represented by the relation HP ¼ 120 2 0.5Q2 (head in m, discharge in m3=s), HA ¼ 20 m, HB ¼ 50 m, HC ¼ 100 m, and H..
A piece of cheese with a mass of 1.11 kg is placed on a vertical spring of negligible mass and a force constant k= 2000N/m that is compressed by a distance of 17.9cm
The earth orbits the sun once a year (3.16X 107s) in a nearly circular orbit of radius 1.50X1011m. With respect to the sun, determine the tangential speed of the earth
A solar concentrating heat exchanger system directs sunlight onto a long,straight pipe. The pipe recieves 153.616 btu/h per foot of length. What is the entropy production
some light rays from a small object sitting on the optical axis of a lens pass through a lens and then all of the rays
The density of a certain metal solid is 7.2 x 10 ^ 3 kg/m^3, What is the speed of sound in this metal
A 9.5 kg mess kit sliding on a frictionless surface explodes into two 4.75 kg parts, one moving at 1.5 m/s, What was the original speed of the mess kit
Astronaut Spud Nick is space-travelling from planet X to planet Y at a speed of 0.59 c. Find the difference in time of arrival of the flashes from the explosions as observed by Spud
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