What has to happen for momentum to be conserved

A ray of yellow light (f = 5.09 * 10^14 Hz) travels at a speed of 2.04 * 10^8 meters per second in (1) ethyl alcohol (3) Lucite (2) water (4) glycerol

Two people try to lift a heavy box. Jack pulls upward with a 100-newton force. Jill pulls upward with a 50-newton force, but neither person moves the box. Compare the amount of work done on the box by Jack and Jill.

What is physical evidence? Provide at least three examples in your answer.

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:

A skeeball has a mass of 0.5 kg. If the skeeball is rolling at 5 m/s, what is the skeeball's kinetic energy? * A) 2.5 J B) 6.25 J C) 12.5 J D) 25 J (B)

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines

Which of the following statements concerning Howard Gardner's multiple intelligences is not correct? A. Gardner is not interested in assessing levels of intelligence. B. Gardner has based his theory on research in various areas of psychology. C.

The force of attraction between two oppositely charged pith balls is 5.3 * 10-6 newtons. If the charge on the two objects is 6.7 * 10-9 coulombs, what is the distance between the two charges? (k = 9.0 * 109 newton·meter2/coulombs2)

To describe velocity you need to know?

Mohammed made a chart to list examples and nonexamples of projectile motion. Which best completes the chart? a - a football thrown in the airb - a kite flying on a stringc - a golf ball rolling off a table d - water spraying from a fountain