Which earthquake scale is based mostly on human opinion and perception of recent events? richter scale moment magnitude scale modified mercalli scale fujita scale saffir-simpson scale?

Two examples of ways that physicists model the physical world

What are 4 examples of a force being exerted?

The masses of the objects are m1 = 17.0 kg and m2 = 10.5 kg, the mass of the pulley is M = 5.00 kg, and the radius of the pulley is R = 0.300 m. Object m2 is initially on the floor, and object m1 is initially 4.

Word problem that involve speed

Two identical rifles are shot at the same time, and the sound intensity level is 64.7 dB. What would be the sound intensity level if only one rifle were shot

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies