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Dahlia Higgins
Suppose you were to play a trumpet after breathing helium, in which the speed of sound is much greater than in air. Would the pitch of the instrument be higher or lower than normal, or would it be unaffected by being played with helium inside the tube rather than air?
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Marlene Small
How can we run out of energy if energy cannot be created or destroyed?
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Krystal Lopez
When do magnets attract other magnets?
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Guest
Why do some kinds of ice on Earth change the sea level when they melt while others do not?
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Jaxon Whitaker
Why are carbon and copper classified as elements
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Leonel Escobar
Which of the following is an extensive property? Select one: a. Density b. Temperature c. Mass d. Specific Heat e. Pressure
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Jair Cowan
How do the earth's physical features affect people's activities?

a. choice of occupation

b. method of transportation

c. recreational activities

d. all of the above

e. none of the above
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Brittany Watkins
True or False. If your skin is wet, the body's resistance to electric shocks increases.
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Elaine Heath
A tool industry characterized by the appearance of hand axes, a bifacial type of blade.
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Linda Elliott
A 0.3-kg ball has the velocity of 20 m/s. what is the kinetic energy of the ball?
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Jacey Salas
Circuit A in a house has a voltage of 208 V and is limited by a 40.0-A circuit breaker. Circuit B is at 120.0 V and has a 20.0-A circuit breaker. What is the ratio of the maximum power delivered by circuit A to that delivered by circuit B
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Alondra Ruiz
3. If the distance of the screen is moved from 100. cm to 200. cm the area of light would in-crease from 150. cm^2 to

A. 37.5 cm2

B. 75 cm2

C. 300 cm2

D. 600 cm24.

Light is projected onto a screen 75.0 cm from a light source. The light sensor records a reading of 4,436 lux at this distance. If the screen is moved from 75.0 cm to 150. cm, the light sensor reading would change to

A. 17,700 lux

B. 8,870 lux

C. 2,218 lux

D. 1,110 lux

5. If you use a screen in the last problem and tilt it the light reading would go down, this is be-cause.

A. In science when we tilt things they always get lower

B. As we tilt the screen the area of light increases and spreads the light over a lager area.

C. As we tilt the serene the area of light decreases and makes the light more concentrated.
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Justine Garcia
How fast must a 0.142-kg baseball move in order to have the same momentum as the bus?
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Gonzalez
Some forces require direct contact, while others, like gravity, act at a distance
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Dennis Ray
Explain the 3 factors that affect the Speed of Sound
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