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A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 40.0m/s every second to keep a 1,000 kg helicopter aloft?
One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 1.48 km. What is the magnitude of the couple's displacement
A small block with mass m=3 kg is on the right of the large block and is initially a distance d=1.4 m above the ground. how long does it take to hit the ground
A large storage tank, open at the top and filled with water,develops a small hole in its side at a point 15.4 m below the water level. If the rate of flow from the leak is equalto 2.80*10-3 m3/min, determine thespeed at which the water leaves the ho..
A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.7x10-3 kg bullet with a speed of 630 m/s
a 3.04 microf capacitor is charged by a 18.0 v battery. it is disconnected from the battery and then connected to an
A point charge with charge q1 = 2.80?C is held stationary at the origin, How much work W is done by the electrostatic force on the moving point charge
Estimate the speed of the water just before striking the turbine blades (overlook air resistance).
A 100-W lightbulb has a resistance of about 12 ? when cold (20 ?C) and 140? when on (hot). Estimate the temperature of the filament
A 16.2 g bullet with an initial speed of 870 m/s embedded itself in a 40.0 kg block, What is the maximum compression of the spring
A car accelerates from rest to a kinetic energy of 2.06 x 105 J in a distance of 638 m. How much force did the car's engine deliver to produce this acceleration.
q1. a planet of mass 6.00 1025 kg is in a circular orbit of radius 2.00 1011 m around a star. the star exerts a force
A long vertical wire carries an unknown current. Coaxial with the wire is a long, thin, cylindrical conducting surface that carries a current of 75 mA upward. What is the size of the current in the wire
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