What type of machine is a seesaw?

A.

simple machine

B.

compound machine

What happens when a star becomes a supernova?

Which population serves the function of primary consumers in a mountain area? A. Elk eat flowers. B. Aspen trees produce their own food. C. Gray wolves hunt, kill, and eat mule deer. D. Coyotes eat elk that were hunted and killed by gray wolves.

A refrigerator a. produces cold. b. removes heat from a cold region and delivers the same amount of heat to a hotter region. c. causes heat to disappear. changes heat to cold. d.

A window washer stands on a scaffolding 30m above the ground. If he did 23,520J of work to reach the scaffolding, what is his mass?

What is the force when two charged spheres distance is in half

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference minima at / pm 35.09 degrees on either side of the central bright spot.

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose? Explain.

a the average distance from the Sun to Pluto is approximately 6.10 x 1 0 ^9. how long does it take light from the sun to reach Pluto?

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed