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A 80- kg child sits in a swing suspended with 2.5- m-long ropes. The swing is held aside so that the ropes make an angle of 30 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go.
A jet aircraft is flying at constant altitude. At t1 = 0 it has components of velocity vx = 150 m/s and vy = 130 m/s, What is the acceleration's magnitude and direction during this time interval
A 12.0 m long conveyor belt, inclined at 40.0°, is used to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has the mass of 1.00 kg, and there are 26 newspapers per bundle. Concl..
The front 1.20 m of a 1600 kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision.
What is the lift (in newtons) by reason of Bernoulli's principle on a wing of area 77 m^2 if the air passes over the top and bottom surfaces at speeds of 270 m/s and 140 m/s, correspondingly.
A 58-kg skater sliding due northeast at an initial speed of 1.5 m/s runs into a snow bank and comes to rest in a time interval of 0.38 s, What is change in the kinetic energy of the skater
A town is installing a new 10” main to carry drinking water. The only section remaining to be installed is a segment through the middle of town. Calculate the length of pipe required for the pipe system.
Three capacitors, C1, C2 = 2C1 and C3 = 3C1 are connected in parallel to a voltage source of value V. What is the voltage across each capacitor when all three switches are closed
Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5 mr2.
A 40 percent efficient electric power plant produces 900MW of electric power and discharges waste heat into 30 C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical A..
By what factor must the mass of the ice be increased if the system is to have the same final temperature?
An airplane is flying horizontally with a speed of 1000 km/h(280m/s) when an engine falls off. avoid air resistance,assume it takes 30s for the engine to hit the ground.
An archer shoots an arrow with a velocity of 45m/s at an angle of 50 degrees with the horizontal. An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the least initial speed required to ..
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