A machine is supplied energy at a rate of 4000 watts and does useful work at a rate of 3761 watts what

is the efficiency of the machine

Two objects are in freefall. Object A experiences a gravitational force of 10 N. Object B experiences a gravitational force of 20 N. Which experiences the greater acceleration?

When does an object have negative velocity

Describe the energy transfers that occur in an electric circular saw that runs from a generator.

Which would be the least effective medium for traveling sound waves?

5. Which of the following statements about electronic ignition modules is correct? A. Most electronic ignition modules have long life spans and don't require any adjustments. B.

One tuning fork vibrates at 440 Hz, while a second tuning fork vibrates at an unknown frequency. When both tuning forks are sounded simultaneously, you hear a tone that rises and falls three times per second.

A block sliding along a horizontal frictionless surface with speed v collides with a spring and compresses it by 2.0 cm. What will be the compression if the same block collides with the spring at a speed of 2v?

How does work get affected when a object is lifted up instead of using a ramp

Choose the correct statement. a. Usually, when one form of energy is converted to another, no energy is wasted. b. The total amount of energy in the universe is gradually decreasing. c. This statement illustrates the first law of thermodynamics. d.

A 10 cm3 block of paraffin (a type of wax) weighs 0. 085 N. It is carefully submerged in a container of gasoline. One cm3 of gasoline weighs 0.0069 N. a. What is the weight of the gasoline displaced by the paraffin? b.