The trains run on a straight level track. The motions of the trains for three cases-A, B, and c-are described
by the position-time graphs shown in Figure 2.23.
In which case(s) do the trains (a) travel in opposite
directions (b) get steadily farther apart as they travel, or
(e) collide

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c