Calculate the efficiency of an engine with an input temperature of 755 K and exhaust temperature of 453 K.

Two skydivers are holding on to each other while falling straight down at a common terminal speed of 57.10 m / s. Suddenly, they push away from each other. Immediately after separation, the first skydiver, who has a mass m 1 of 94.

Which planet might best be described as a large dirty ice ball?

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: () Na2HPO4 → () Na4P2O7 + () H2O

E. A pyramid has a square base. Its volume is 48 cubic centimeters and its height is 4 centimeters. What is the length of one side of the base? A. 2 cm B. 6 cm C. 12 cm D. 144 cm

Scientists think the moon was formed when a. a large object struck Earth, and ejected material from the collision combined. b. gravitational forces attracted a moon formed elsewhere in space. c.

A new object has been discovered in the solar system. In your own words, justify how the object can be proved to be a comet.

What is cosmic microwave background radiation?

Ocean water has a salinity of 35 parts per thousand. Fresh water has a salinity of less than 0.5 parts per thousand. What can you conclude from this information? A. Ocean water is rich in salt minerals. B.

You decide to add up all the work you did yesterday. If you accomplished 10,000 newton·meters of work yesterday, how much work did you do in units of joules?

What causes day and night on earth?