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

What is 1 lb to 4.45 N (newtons) ?

The force between to objects of charge + Q and - 2 Q, respectively, is measured as - 2F. If the charge on the first object is doubled and the distance between the objects is doubled, what will the force between the objects become?

Use mass in a sentence

What force allows an object to move at a constant rate?

If a person is in front of a smooth surface from which a sound is reflected, the person would hear a sound that a. seems to come from behind the surface. b. has a higher intensity than the sound produced by the source. c.

Do you think an observer on another planet in the solar system might see eclipses

A. A vector is any element of a vector space. Is this statement true or false? A. True by the definition of a vector space B. False; not all vectors are elements of a vector space. C. False; a vector space is any element of a vector.

19 Which gas is the most abundant greenhouse gas? A. ozone B. chlorofluorocarbon C. carbon dioxide OD. methane E. water vapor Reset Next

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pushed together, without touching. How is the amount of charge on the plates affected during this process? a.

Which of the following creates a longitudinal wave? A. striking a gong B. turning on a flashlight C. shaking a rope up and down D. dropping a stone into a pond