What is the main reason that the spectra of all stars are not identical? Explain.

If a car travels 30 mi. north for one-half hour, 50 mi. east for one hour, and 30 mi. south for 30 min., what is the total displacement of the car? mi

A toy roller coaster cart has a mass of 2kg. The track of the roller coaster has a semicircular valley with a radius of 1.2 meters.

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

The myelin on myelinated neurons can be degraded or destroyed in diseases such as multiple sclerosis-a process called demyelination. If a myelinated neuron was affected by demyelination, how would this affect action potentials in that neuron? A.

The centripetal force on an object in circular motion is a. perpendicular to the plane of the object's motion. b. in the plane of the object's motion and perpendicular to the tangential speed. c.

Which type of light travels at the fastest speed? a. none of these b. ultraviolet light c. infrared light d. visible light

How far does a car go in 30 seconds at a speed of 29 m/s?

Classify the health care system in the US. Is it market based or command based? Why?

If a motorcycle moves with a constant velocity, can you conclude that there is no net force acting on it?

Which defintion of heat is most scientifically accurate