A crane is used to lift an object. The crane applies a force of 400 to lift the object a distance of 25 meters in 20 seconds. Calculate the work in J performed by the crane to lift the object

Which statement correctly describes the formation of electric current? a. A resistance causes electric charges to move from lower to a higher potential. b. A voltage causes electric charges to move from lower to a higher potential. c.

Suppose that you hear a clap of thunder 16.2 s (seconds) after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s and the speed of light in air is 3.00*10^8 m/s. How far are you from the lightning stroke?

The current in a hair dryer measures 12 amps. The resistance of the hair dryer is 12 ohms. What is the voltage?

A tuned mass damper for a skyscraper consists of a mass-spring system with spring constant 0.288 M/m. What should be its mass if it's to oscillate with a period of 5.91 s

An object in motion stays in motion and an object at rest stays at rest is which of Newton's Laws?

Describe the factors that determine power in your own words (not from a website)

A 3.00 watt electric motor is plugged into an electrical outlet It takes the motor 30 00 seconds to lift a mass of 254.9 g a distance of 10.00 cm. In that time, the motor has used 90.

The potential energy of two atoms in a molecule can sometimes be approximated by the Morse function, U (r) = ARe (R-01.5 - 1) 2 where r is the distance between the two atoms and A, R, and S are positive constants with S << R.

State the law of conservation of energy in your own words

Which is an element? Select one: a. salt b. carbon dioxide c. salt water d. carbon