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It is well known that bullets and other missiles fired at Superman simply bounce off his chest. Suppose that a gangster sprays Superman's chest with 6 g bullets at the rate of 100 bullets/min, the speed of each bullet being 450 m/s. Suppose too that the bullets rebound straight back with no change in speed. What is the magnitude of the average force on Superman's chest from the stream of bullets?
An object at rest explodes into three pieces of equal masses. One moves east at 23 m/s, while the second piece moves northwest at 14 m/s. Estimate the velocity of the third piece? Suppose each piece has a mass of 2 kg.
A thick layer of oil is floating on the surface of water in a tank. A beam of light traveling in the oil is incident on the water interface , What is the refractive index of the oil
A 1200 kg car moving north at 27 m/s is struck by a 2165 kg car moving east at 11.0 m/s. The cars are stuck together. How fast and in what direction do they move at once after the collision.
Two speakers, one directly behind the other, are each generating a 295-Hz sound wave. What is the smallest separation distance between the speakers that would produce destructive interference at a listener standing in front of them? Take the speed..
A(n) 60-g ice cube at 0°C is placed in 730 g of water at 28°C. What is the final temperature of the mixture? °C
A 200g, 40cm diameter solid cylindrical turntable rotates on frictionless bearings at 60rpm. A 20g block sits at the center of the turntable. What is the turntables angular speed
A thin block of soft wood with a mass of 0.074 kg rests on a horizontal frictionless surface. Calculate the initial and final kinetic energies of the system
Suppose a car is traveling at 13.0 m/s, and the driver sees a traffic light turn red. What is the stopping distance of the car
Two teams of nine members each engage in a tug of war. The first team's members have average masses of 73 kg, What is the acceleration of the two teams
A prescription for a corrective lens calls for +1.50D. The lensmaker grinds the lens from a "blank" with n = 1.56 and a preformed convex front surface of radius of curvature of 40.0 cm. What should be the radius of curvature of the other surface?
A small block with mass 0.200 kg is attached to a string passing through a hole in a frictionless, horizontal surface. What is the radius of the circle when the string breaks
Two small insulating spheres with radius 4.00×10-2 are separated by a large center-to-center distance of 0.595. One sphere is negatively charged, with net charge -2.40, and the other sphere is positively charged, with net charge 3.70. The charge i..
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