If the work put into a lever is 25.0 joules and the work done by the lever is 20.0 joules, what is the efficiency of the lever?

Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is needed to monitor their mass gains or losses to adjust diets.

Does being creative in doing science mean that they a scientist should make things up Why?

A cell phone company relies on which kind of waves in order to provide service for its customers? ultraviolet waves infrared waves gamma rays microwaves

How might a tracer be used to diagnose a digestive problem?

Transverse and longitudinal waves both a. have compressions and rarefactions. b. transfer energy through a medium. c. move at right angles to the vibration of the medium. d. are capable of moving the medium a long distance.

What is the term for the basic unit of electric current? The basic unit of electric current is the.

When a sailboat overtakes a powerboat, which vessel is the stand-on vessel?

Both matter and energy can eneter and exit which of the following systems? A. open only B. both open and closed C. isolated only D. both closed and isolated

1. Find the charge if the number of electrons is 4 x 10-18

Which of the following describes resistance force?