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Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph (miles per hour). A local team has drafted an up-and-coming left handed pitcher who can consistently throw at 91.50 mph. Assuming the ball has a mass 143.0 g and has this speed just before a batter would make contact,
how much kinetic energy does the ball have?
Kball = _______________ J
How high would the ball need to be dropped from to attain the same energy (neglect air resistance)? (The acceleration due to gravity is 9.81 m/s2.)
hball = ______________ m
A charge +q is at the origin. A charge -2q is at x = 8.50 m on the +x axis, For what finite value of x is the electric field zero
The driver of a car wishes to pass a truck that is traveling at a constant speed of 20.9m/s . Initially, the car is also traveling at a speed 20.9m/s and its front bumper is a distance 23.1m behind the truck's rear bumper, What is the final speed ..
A 2 kg object is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 20.0 N is needed to hold the object at rest when it is pulled 0.200 m from its equilibrium position.
A gun shoots bullets that leave the muzzle with a speed of 338 m/s. If a bullet is to hit a target 104-m away at the level of the muzzle, the gun should be aimed at a point above the goal.
A metal rod with a length of 22.0cm lies in the xy-plane and makes an angle of 37.9 degrees with the positive x-axis, What is the magnitude of the emf induced in the rod
A rocket with an initial mass of 1 000 kg adjusts its thrust by varying the rate at which mass is ejected. at what rate is mass being ejected at that instant
A 0.80kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.1m on a frictionless horizontal surface. what is the maximum speed the ball can have
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
a closed Gaussian surface in the shape of a cube of edge length 2.03 m. What is the net charge (in Coulombs) contained by the cube
A mercury thermometer is constructed as shown below. Find the change in height of the mercury column that occurs with a temperature change of 24.0°C
A 180 g block on a 49 cm-long string swings in a circle on a horizontal, frictionless table at 74 rpm.
A 1.2 kg toy car traveling at 2.0 m/s to the right collides and sticks to a 2.0 kg toy car traveling at 1.6 m/s to the left. What fraction of the total initial kinetic energy was lost in the collision
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