What does it mean for a substance to be an insulator?

What is the momentum of a 2-kg toy truck that moves at 10 m/s

3000 J of work are done by an elevator on a man lifting him to a height of 2.5 m in 0.4 seconds ? how much energy has the man gained in being lifted?

A car acclerates forward at 3.5m/s2. if the car has a mass of 873 kg, whats the force applied to the car

Comic-strip hero superman meets an asteroid in outer space, and hurls it at 850 m/s, as fast as a bullet. the asteroid is three thousand times more massive than superman. in the strip, superman is seen at rest after the throw.

A technician is checking refrigerant system pressures. Both high - and low-side service ports are located on the A/C compressor. When the compressor is engaged, the high-side pressure instantly goes over 375 psig.

What shows evidence of active transport?

A man stands on a platform that is rotating (without friction) with an angular speed of 1.2 rev/s; his arms are outstretched and he holds a brick in each hand.

A perfectly conductive plate is placed in the y z-plane. An electromagnetic wave with electric field is incident on the conductor.

What is Electric potential energy in the easiest way to explain?!!

A variable vane turbocharger allows for elimination of the A. exhaust cooler. B. turbocharger wastegate. C. diesel oxygen sensor. D. intake air cooler.