You drop a 30 g pebble down a well. You hear a splash 2.7 s later. What was the pebble's speed just as it reaches the water? Assume g = 9.8 m/s2

Aluminum chips have been found in an oil pan after removal. Technician A says that the chips are likely from a deteriorated valve seal. Technician B says that the chips are likely from broken piston skirts. Who is right?

Sonja is riding her bike. She takes her feet off the pedals to freewheel down a hill. Describe the energy transfers that take place as the bike travels down the hill. Ignore friction and air resistance.

A _ describes the shape of a planets orbital path

Which of the following correctly describes the hierarchy that exists in the universe? A galaxy refers to all existing matter, energy, and space that is held together by gravity.

If velocity decreases, mass increases or decreases?

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400.

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s