A baseball pitcher is employing a ballistic pendulum to determine the speed of his fastball. A lump of clay is suspended from a cord 2.0 m long
When the pitcher throws his fastball aimed directly at the clay, the ball suddenly becomes embedded in the clay and the two swing up to a maximum height of 0.080 m. If the mass of the baseball is 0.21 kg, find the speed of the pitched ball.
21 m/s
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A cyclotron is designed to accelerate protons (mass 1.67 x 10-27kg) up to a kinetic energy of 2.5 x 10-13 J. If the magnetic field in the cyclotron is 0.75 T, what is the radius of the dipole magnets in the cyclotron?
A. 14 cm B. 24 cm C. 17 cm D. 5.8 cm
A 600-kg car traveling at 24.5 m/s is going around a curve having a radius of 120 m that is banked at an angle of 20°
(a) Is the curve properly banked for the car's speed? (b) What is the minimum coefficient of static friction required between the road and the car's tires so the car does not skid?
Liquid water cannot survive on the surface of Mars because:
A) the atmosphere is too dense. B) the air pressure is too low. C) Mars has the highest escape velocity. D) Mars has never differentiated.
Except for such nuclear processes as nuclear reactors, nuclear bombs, and radioactivity, all of the common forces we see around us are due to just two underlying or "fundamental" forces. One of these two forces is the gravitational force
The other is A) contact forces. B) the color force. C) the chemical force. D) the frictional force. E) the electromagnetic force.