baseball pitcher throws a baseball, which has a mass of 0.145 kg, at a speed of 153 km/h. What is the kinetic energy of the baseball?

How does friction affect a machine efficiency?

Which of the following represents a system that is completely open? A. a pressure cooker B. a pressurized canister of helium gas C. a capped soda bottle D. a port of boiling water

When viewing a piece of art that is behind glass, one often is affected by the light that is reflected off the front of the glass (called glare), which can make it difficult to see the art clearly.

Two polarizers are held in front of a light source such that their transmission axes are parallel. As the angle between the two transmission axes increases toward 90°, which of the following is true? A.

True or false the mechanical advantage to simple machines is that they allow a decreased input force to create a larger output force.

A 52.0 kg skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the ramp?

When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Which law of motion is being described in this scenario?

A small car collides with a large truck. Is the magnitude of the force experienced by the car greater than, less than, or equal to the magnitude of the force experienced by the truck? a. less than b. equal to c. greater than

As an airplane is taking off at an airport its position is closely monitored by radar. The following three positions are measured with their corresponding times: x1 = 241.22 m at t1 = 3.70 s, x2 = 297.60 m at t2 = 4.20 s, x3 = 360.23 m at t3 = 4.

A stunt car with a mass of 1000 kg crashes into a tree on a movie set during the collision acceleration of the car with 3 m what was the force of impact of the collision on the car