In each cycle, a heat engine receives an input of 1540 J of heat and exhausts 1030 J of heat. What is the thermal efficiency?

0.274

0.456

0.669

0.331

The current in a hair dryer measures 23 amps. The resistance of the hair dryer is 11 ohms. What is the voltage?

Which statement is true for electric field lines? Field lines should always be parallel to the equipotential lines. Field lines should always be perpendicular to the equipotential lines. Field lines should always be parallel to each other.

During which phase does the arrangement of water molecules become more orderly? A. Melting B. Subliming C. Boiling D. Condensing

If an atom has 5 protons and 6 electrons it's charge

Two speakers hang from racks placed in an open field. When sound of the same frequency comes from both speakers, no sound is heard in some locations. The sound is loud in other places at about the same distance from the speakers. Explain.

The forklift exerts a 300.0 N force on the box and moves it 15.0 m into the air. How much work does the forklift do? A. 500 J B. 1.50 * 10^3 J C. 4.50 * 10^3 J D. 0.00 J

Why the room gets hot even we open the door of refrigerator?

What effect will taking a dose of antibiotics that is too small have on the bacteria you are trying to destroy? a. all of the bacteria will pass on their genes b. none of the bacteria will pass on their genes c.

Multiply 0.00032 cm by 4.02 cm and express the answer in scientific notation

Apply why does a box on the seat of a car slide around on the seat when the car speeds up slows down or turns a corner?