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A softball having a mass of 0.255 kg is pitched at 92.3 km/hr. By the time it reaches the plate, it may have slowed by 13.0 percent. Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is 14.5 m.
What is the electric force
2 positive charges each is 4 micro C located at the positions (0,0) and (20,0) and all coordinates are in cm, calculate the electric field due to the two charges
The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.8 m/s as it passes through the lowest point. Illustrate what is the tension in the rope at that point?
If light is shown from a sheet of glass toward water and just skims the boundary between the glass, at what angle was the light aimed toward the water
A balloon is filled with helium at a pressure of 2.4 x 10^5 Pa. The balloon is at a temperature of 18 degrees Celsius, How many helium atoms are contained in the balloon
on a windy day, a person on a cart (combined mass m of 70kg) begins at the top of a hill 10m hihg traveling at 3m/s, At what distance from the bottom of the hill did the car stop
A K+ ion and a Cl ion are directly across from each other on opposite sides of a membrane 8.9 nm thick. What is the electric force on the K+ ion due to the Cl ion? Ignore the presence of other charges. What direction will it go in relation to the ..
A kaon is moving in the +x direction decays by this process, where that pi^+ is moving off at a speed of 0.9c in the +x-direction, determine the speed of the kaon before the decay
A space station is constructed in the shape of a hollow ring of mass 5.90 104 kg and radius 140 m. The station has 300 crew members (each with average mass 65kg), How much work is done to get the space station spinning
A jet plane passes over you at a height of 4990 m and a speed of Mach 1.75. Find the Mach cone angle
a 6.0 cm diameter horizontal pipe gradually narrows to 4.5 cm. When water flows through the pipe at a certain rate, What is the volume rate of flow
Two identical particles, both of mass m and charge q, What is the speed of each particle when they are a distance 2d apart
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