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If a 90 mph (40.23m/s) fastball, with a mass of 0.145kg, is struck by a bat, and they are in contact for .005s, find the force which must be exerted by the bat on the ball for the player to make a home run? Assume the ball approaches the bat horizontally, the ball leaves the bat at an angle of 40 degrees above the horizontal, and the distance travelled for a home run is 50m. Hint: use kinematics first to find the velocity with which the baseball leaves the bat, then find the x and y components of the Impulse-Momentum equation to find the force.
How much work does the electric field do in moving a proton from a point with a potential of +135V to a point where it is -70V? Express your answer in joules.
A high intensity desk lamp is rated at 45W but requires only 12V. It contains a transformer that converts 120V household voltage. What is the current in the secondary coil
the driver of a car wishes to pass a truck that is traveling at a constant speed of 20.2 ms. initially the car is also
What is the new tension in the slinky?
A 24 Volt battery is connected to a capacitor, resulting in 47 µC of charge stored on the capacitor. Obtain how much energy is stored in the capacitor
A satellite has a mass of 6155 kg and is in a circular orbit 4.76 × 105 m above the surface of a planet. What would be the true weight of the satellite if it were at rest on the planet's surface
In winter a lake has a 0.30 meter thick ice layer over 1.20 meter of water. Find how far horizontally from that spot does the light ray strike the lake bottom
Approximate the heat transfer through this window by ignoring the glass. That is, calculate the heat flow per second through the 1.60 cm of air with a temperature difference of 20.0° C
A generator has a square coil consisting of 600 turns. The coil rotates at 66 rad/s in a 0.32 T magnetic field. What is the length of one side of the coil
A 5.30 ball is dropped from a height of 11.5 above one end of a uniform bar that pivots at its center. The bar has mass 8.00 and is 6.20 in length. How high will the other ball go after the collision
In proton-beam therapy, a high-energy beam of protons is fired at a tumor, What is the total charge of the protons that must be fired at the tumor to deposit the required energy
As you zip through space in your PPS (personal propulsion suit), your pulse rate, as you count it, is 121 bpm, How fast are you moving with respect to the Moon
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