Why do sound waves do not travel in empty space?

a. because sound waves do not need matter to travel.

b. because sound waves need matter to travel.

c. because sound waves need vacuum to travel.

d. none of the above

Give an example of an energy conversion that produces an unwanted form of energy?

How society has been benefited by the knowledge of physics

a ball slows down as it rolls up hill this is an example of? neutral motion, relative velocity, positive acceleratio, negative acceleration

if two gliders of equal mass m and equal and opposite initial velocity v collide perfectly elastically, using both the momentum and energy conservation equations from equation (71), what is the initial kinetic energy and what is the final kinetic

What is the net force on a 2-kg skateboard accelerating at a rate of 2 m/s2?

A soccer ball player bounces the ball off her head, changing the velocity of the ball. She changes the x-component of the velocity of the ball from vix = 7.9 m/s to vfx = 5.9 m/s and the y-component from viy = - 3.4 m/s to vfy = 4.5 m/s.

Do you think an observer on another planet in the solar system might see eclipses

A. A vector is any element of a vector space. Is this statement true or false? A. True by the definition of a vector space B. False; not all vectors are elements of a vector space. C. False; a vector space is any element of a vector.

19 Which gas is the most abundant greenhouse gas? A. ozone B. chlorofluorocarbon C. carbon dioxide OD. methane E. water vapor Reset Next

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pushed together, without touching. How is the amount of charge on the plates affected during this process? a.