Explain why adding oil to the moving parts of a machine can increase its efficiency

A car traveling at a velocity v can stop in a minimum distance d. What would be the car's minimum stopping distance if it were traveling at a velocity of 2v? a. 4d b. 2d c. 8d d. √2 d e. d

Which of these could be the dimensions of an object with a volume of 1 cm³? A. 1 cm * 1 cm * 1 cm B. 0.5 cm * 1 cm * 4 cm C. 10 cm * 1 cm * 10 cm D. 0.3 cm * 0.3 cm * 0.4 cm

A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1180 Hz. The bird-watcher, however, hears a frequency of 1260 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?

What are the Si prefix values

Describe how atoms and elements are related

Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium

A flash of white light containing all the colors of the visible spectrum in air shines straight down on the surface of a pool.

A car accelerates uniformly from 0 to 15m/s in 5 s. Calculate acceleration.

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is: