A heat engine with a thermal efficiency of 45 percent rejects 500 kj/kg of heat. how much heat does it receive

You are hiking to the top of a small canyon. When you stop for a rest you decide to shout "hello" across the canyon. You hear your echo 1.10 s after your shout. If sound waves travel at 340 m/s, how wide is the canyon?

A plane can fly at 385mph in still air. If it can fly 220 miles downwind in the same amount of time it can fly upwind at 165 miles, what is the velocity of the wind?

Two waves on identical strings have frequencies in a ratio of 2 to 1. If their wave speeds are the same, then how do their wavelengths compare?

How can solar cookers reduce our carbon footprint

Rank the measurements in order of increasing pressure. 4 kPa, 16 N/m2, 311 N/m2, 0.3 Pa 16 N/m2, 311 N/m2, 0.3 Pa, 4 kPa 4 kPa, 16 N/m2, 311 N/m2, 0.3 Pa 4 kPa, 311 N/m2, 16 N/m2, 0.3 Pa 0.3 Pa, 16 N/m2, 311 N/m2, 4 kPa

Which of these is a mixture? calcium carbon dioxide salt water potassium

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?

1) Which is a characteristic of a metal? A) It looks dull. B) It feels brittle. C) It is a good insulator. D) It is a good conductor of electricity. 2)

1:a boy 2 a girl pulling a heavy crate at the same time w/10 unite of force each. What is the net force acting on the object