When a certain ideal engine performs 2000 kj of work, 4750 kj of heat flows out of the engine at 275°c. (a) how much heat flows into the engine? (b) what is the efficiency of the engine? (c) at what temperature does heat flow into the engine?

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c. the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors

Write down two additional questions about earth's magnetic field that will make your presentation more informative.