Why are chloroplast not needed in animal cells?

Your tennis ball rolls off a 0.91m tall table and hits 0.25m out from the table. What is it's time in the air? What is its vertical velocity before hitting the ground (show work)

This is a change in an object's position. Net Force Gravitational Pull Motion Force

A 0.145-kg baseball is pitched at 42 m/s. the batter hits it horizontally to the pitcher at 58 m/s. find the change in momentum of the ball.

What occurs when two Stars collide into each other?

Calculate number of photons from energy and wavelength

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?