Imagine a Carnot engine has a hot reservoir of 680 K and a cold reservoir of 220 K. What is the efficiency of the engine?

How is the current controlled for a given voltage

An empty spacecraft weighs 250,000 N on earth and carries 700,000 N of propellant. The spacecraftlands on Mercury, where the acceleration due to gravity is 3.7 m/s2.

What is the term used to describes altering the pixel colors where the edges of the object and the background meet, so that the object appears to merge with the background?

Which of these is an example of an environment changing slowly? A. Tsunami B. Hurricane C. Flooding D. Pond sucession

Materials have unique properties because each one is made up of different kinds of which particle?

During a snowball fight two balls with masses of 0.4 kg and 0.6 kg, respectively, are thrown in such a manner that they meet head on and combine to form a single mass of 1 kg. the magnitude of intial velocity foreach is 15 m/s.

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?