Define independent variable. What are the independent variables in this experiment?

Airplane flight recorders are made to survive horrific crashes. In an impact test to simulate a crash, the 41.0 kg box for the recorder is projected at a wall. The speed of the box is 220 m/s and the box is brought to a halt in 6.

Which of the following describes work? Energy acts on an object. Force acts on an object. Force acts on an object and causes a displacement of that object. Friction only acts on an object and causes a displacement of that object.

Which property is common to all halogens? They are all highly reactive nonmetals. They are all unreactive nonmetals. They are all metalloids. They are all highly reactive metals.

A 5.0-kg rabbit and a 12-kg Irish setter have the same kinetic energy. If the setter is running at speed 4.9 m/s, how fast is the rabbit running?

You should always wear your seat belt just in case the car comes to an abrupt stop. The seat belt will hold you in place so that your body does not continue moving when the car stops.

1. The sun and other stars produce visible light by a. fluorescence. b. luminescence. c. incandescence. d. electroluminescence.

What are gravitons?

Which of the following would be considered basic science questions? A. How can cars be made safer? B. What is the best way to improve a gas engine? C. Why do many birds have colorful feathers? D. What are the stages in the life cycle of a star?

Which description does the phrase "mechanical advantage" most closely relate to?

The breaker of a certain circuit installed in a house shuts down at 10 amps. Can we connect a water heat of 2 kW to a power outlet of 240 V in this circuit?