What element are the cores of massive stars made of when a supernova occurs?

a. silicon

b. iron

c. oxygen

d. neon

An airplanes flies 2220 miles in 3. What is it's average speed in miles per hour?

At the beginning of a basketball game, the referee tosses the ball straight up with a speed of 4.6m/s. A player cannot touch the basketball until it has reached maximum height and begins to fall back down.

How is force related to acceleration and gravity?

When a bat strikes a ball, the force exerted can send the bat backwards. The force exerted on the bat is due to Newton's II law.

Barometers have long been used to predict the weather. Jay and Jeff were responsible for recording the class weather data each day in March. One day, they noticed that there was a rapid change in the barometric pressure.

To generate higher profit margins, producers must work to increase their total supply. increase their total expenses. decrease their customer base. decrease their production costs

Solar energy isn't usually used as the only power source for a reason because what

What particle can be stopped by skin

What was significant about the atomic theory that democrituis proposed?

What is the mechanical advantage of a pulley?