From the top of the tower, an object is thrown horizontally with an initial velocity v0. Cancel through air resistance. Find the expression for the normal acceleration of an object in orbit at
time t (what is the free fall acceleration)?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

What explosion in the upper solar atmosphere releases about as much energy as millions of 100-megaton hydrogen bombs exploding simultaneously?

If frequency goes up, what happens to wavelength? does it get shorter or longer?