Which one of the following environments will sound not travel through?

A. Liquid

B. Gas

C. Solid

D. Vacuum

How does mass play a role in the life cycle of a star?

What is a vector? A. a scalar quantity B. a quantity that has magnitude and direction C. a magnitude that can be measure D. a direction

The molecular formula of caffeine if C8H10N4O2. What is the empirical formula?

Which words or phrases describe the outer planets? Check all that apply.

Which type of reaction is NaCl + AgNO3 → NaNO3 + AgCl?

Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?

Should young people be allowed to do extreme sports? (give me two reasons why) 1. Opinion: 2. Reason why: 3. Reason why:

A light ray is incident on a reflecting surface. If the light ray makes a "35°" angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Reimbursement means that a client is A. able to apply for healthcare insurance and refunded for a partial sum of the payment plan by the state. B.

Meg runs a 10km race in 45 minutes (0.75 hours). What was her speed in kilometers per hour? a. 22 km/hr b. 7.5 km/hr c. 4.5 km/hr d. 13 km/hr