A roller coaster is stationary at the top of a ramp. What is the kinetic and potential energy of the roller coaster?

A. potential energy: zero
kinetic energy: zero

B. potential energy: high
kinetic energy: high

C. potential energy: high
kinetic energy: zero

D. potential energy: zero
kinetic energy: high

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Which of the following statement is false

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton