Alice and jim calculate that they must do 1,800 j of work to push a piano up a ramp. however, because they must also overcome friction they actually must do 2,400 j of work. what is the efficiency of the map

A pot of water is boiled on a stove. Which of the following definitions of the system enables the most straightforward thermodynamic analysis of the process A. The system is the pot and water. B. The system is the stove, pot, and water. C.

A skater wearing in - line skates (no friction) is standing in the middle of the aisle inside a bus and is not holding on to anything.

Which organelle generates most of the energy the cell needs to function and stay alive?

An arrow is shot at a 30 degrees angle with the horizontal. It has a velocity of 49 m/s. How high up does it go?

The professor throws a ball straight up. The ball leave's the prof's hand 2.0 m above the ground, with a velocity of 15 m/s.

What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00? express your answer in radians?

Which of these could NOT be used to find the mechanical advantage of an inclined plane? A. input force B. output force C. percent efficiency D. length and height of inclined plane

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?