A sample of plutonium-239 decays to one-eighth of its original amount after 7.236 x 104 years. What is its half-life?

Why is voltage the same in a parallel circuit?

Discuss how electric current is able to flow.

How much heat is absorbed by a 125 g sample of water when it is heated from 25.20 ºc to 32.80 ºc? the specific heat of water is 4.184 j/g ºc?

An iron nail is made up of particles. What is true about the particles? They move all over the place. The force of attraction between them is small. The spacing between them is large. They stay in place and vibrate.

Suppose a runner completes a 10k (10.0 km) road race in 41 minutes and 25 seconds. what is the runner's average speed in miles per hour?

What conditions in the nucleus are likely to result in the nucleus breaking apart? A. When the repulsion of the strong force is weaker than the repulsion of the electrostatic force B.

What color do you see when all colors of light are reflected

A ball is thrown with a velocity of 20 m/s at an angle of 60 degrees above the horizontal. What is the horizontal component of its instantaneous velocity at the the exact top of its trajectory?

You pull on a wagon resting on the sidewalk. What will happen next. A. The wagon does not move because the wagon applies more force to you than you apply to the wagon. B. The wagon moves because you apply more friction to the ground. C.

If someone travels 3000 feet in one second, how far will it travel in 18 minutes