There is a 30 g sample of be-11 it has a half life of about 14 seconds how much will be left after 28 seconds

Which term describes the vector sum of the forces acting on a body?

How does thinking about light as a stream of particles, rather than a single wave?

Two solid yellow lines on the roadway mean that passing is permitted.

When you encounter a yellow light as you approach an intersection what is the safest approach to take?

If two lightbulbs are parallel to each other, they have the same brightness. If the same two lightbulbs are put in series with each other, they also have the same brightness but are dimmer than when they are in parallel. Explain why.

How do matter and energy interact?

What is something that has a lot of thermal energy?

Why do we use a shunt on the galvanometer

Two of the element sodium combine with one of the element chlorine to form the sodium chloride.

What is the wavelength of an earthquake wave if it has a speed of 4 km/s and a frequency of 7 Hz?