During an elbow flexion exercise, the relative angle at the elbow is 118 degrees at 0.67 seconds and 82 degrees at 0.75 seconds. What is the average velocity of the elbow in degrees / seconds?

Einstein's theory of special relativity contains some very strange ideas such as time dilation (moving clocks run slow), length contraction (moving lengths are shorter), and lack of absolute simultaneity. What is the basis of these ideas?

As material from the outer envelope of the larger star builds up on the surface of the white dwarf, its temperature and density increase continuously. Under this scenario, what is the first event that will eventually happen?

When does a spring tide take place

A machine performs 482 J of work over a period of 1.5 min. How much power does the machine have?

What would have happened to the earth if it were 10% closer to the sun?

What are the benefits of the cool-down period following exercise?

What force keeps our atmosphere from floating out into space? heat water gravity outgassing

a subsrance has an atomic number of 80. How many protons and electrons do atoms of the substance have? what is the subsance?

Ideal meters problem. What internal resistance is ideal for a voltmeter? What internal resistance is ideal for an ammeter?

numerical question : what is the required heat to raise the temperature of 2 kg parrafin by 10 Celsius if 44000 joules is required to raise it by 200 celsius