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A hydraulic lift in a garage has two pistons: a small one of cross-sectional area 3.60 cm2 and a large one of cross-sectional area 250 cm2.
a) If this lift is designed to raise a 3300 kilogram car, find what minimum force must be applied to the small piston?
b) If the force is applied through compressed air, obtain what must be the minimum air pressure applied to small piston?
a surveyor 100 m from a long straight 200 kv dc power line suspects that its magnetic field may equal that of the earth
A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 8.0 m above the net. What is the average force on the net due to the boy during the interval
The inner edge of a race track is in the form of a rectangle with two semicircular ends on the shorter sides. The rectangle is 82.0 m wide and 137.0 m long. The race track is 5.50 m wide.
A silver wire of diameter 1.0 mm carries a current of 140 mA. How long (on average) does it take for a conduction electron to move 1.0 cm along the wire
A uniform flat rectangular sheet of mass m and side lengths a and b rotates with angular speed ? around a diagonal, What is the upper bound on the torque
An astronaut is orbiting a black hole with a mass of2.0x1031 kg at a distance of 126km from its center. What is the net tidal force pulling his cheeks apart
A spherical ball with a radius of 2.660×10-1 m is completely submerged in a fluid that has a density of 1.081×103 kg/m3. What is the volume of the fluid displaced by the ball? What is the weight of the fluid displaced by the ball?
Two boxes are seen to accelerate at the same rate when a force Fis applied to the first box and 4F is applied to the secondbox. What is the mass ratio of the boxes?
you are standing across the street from a tall building when the top of the building h 80 m is hit by lightning and a
A thin film of cryolite (nc = 1.37) is applied to a camera lens (ng = 1.65). Find what minimum thickness gives high reflectivity at 490 nm
A 12 kg piece of zinc at 65C is placed in a container of water. The water had a mass of 20 kg and a temperature of 12C before the zinc was added. What is the final temperature of water and zinc
A 0.35kg mass suspended from a spring moves with simple harmonic motion. At the instant mass is displaced from equilibrium by -0.105 m, what is its acceleration? (The spring constant is 11.8N/m)
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