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A helium balloon lifts a basket and cargo of total weight 2080 N under standard conditions, at which the density of air is 1.29 kg/m3 and the density of helium is 0.178 kg/m3. What is the minimum volume of the balloon?
a random sample of 49 selected from a population with a standard deviation of 14 yielded a mean 125. the mean and the
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. What is the height of the arrow once it has travelled the 47.0 m horizontally
q1. vector is along a measured trail and is 1310 m in a direction 27.0 deg north of east. vector is not along a
A baseball player hits a home run into the right field upper deck. The ball lands in a row that is 140 horizontally from home plate and 30.0 above the playing field. Determine the ball's average velocity components
What is the least (non-zero) thickness for the air layer between two flat, and parallel, glass surfaces if the glass is to appear dark while 640 nm light is incident normally? What if the glass is to appear bright.
A car is parked at the top of a 52m -high hill. It slips out of gear and rolls down the hill. How fast will it be going at the bottom
A wrecking ball (weight = 4600 N) is supported by a boom, which might be assumed to be uniform and has a weight of 3600N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and t..
Water flowing through a 2.0cm -diameter pipe can fill a 500L bathtub in 4.9min. What is the speed of the water in the pipe
At LHC, what force is curving the trajectory of accelerating hadrons, forcing them to pass trillions of times around the tunnel track, before they are collided
A Carnot cycle heat engine uses steam as the working fluid and has a thermal efficiency of 20%. calculate the work per kilogram of steam
A 0.9-kg block begins to move when it is pulled by a rope on a horizontal surface by a 3-N force. What is the force of static friction acting on the block
a man swimming at 3 m/s crosses a river flowing East at 1 m/s. The river is 300 m wide. At what angle to the bank should he swim
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