Billy is sitting in a chair in class. If the action force is the downward push of his weight on the chair, what is the reaction force?

Which of the following best defines the science of separating color wavelengths? a. spectroscopy b. color-detection c. photo-chemistry d. spectrophotometry

Until the late 1800s, which of the following sources was used to heat most homes?

A car has a speed of 2 m/s and a mass of 1500 kg. What is the cars kinetic energy? A. 4500 J B. 3000 J C. 1500 J D. 6000 J

Adding energy or increasing the speed of the particles at very low pressure in a solid would cause A) boiling. B) condensation. C) melting. D) sublimation.

Which planet has the highest average surface temperature, and why? a. Mercury, because of its dense carbon dioxide atmosphere. b. Venus, because of its dense carbon dioxide atmosphere. c. Mercury, because it is closest to the Sun. d.

When a siren is approaching you, how does the wavelength of the waves reaching you compare to the actual wavelength that the siren emits?

In a harbor, you can see sea waves traveling around the edges of small stationary boats. Why does this happen?

Correct unit of speed

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.