The focal length when the refractive index of the lens is increased and when the curvature radius of the lens is increased.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.