Final review

Front

What is the half-life of Strontium-90?

Back

The half-life of Strontium-90 is 29 years.

Front

If you start with 2000 kg of Strontium-90, how much is left after 116 years?

Back

1000 kg.

Front

What happens to light bulbs in a parallel circuit if one bulb breaks?

Back

The other light bulbs remain lit because their circuits are not affected.

Front

What is a parallel circuit?

Back

A parallel circuit is a type of electrical circuit where there are multiple paths for current to flow.

Front

What is net force?

Back

Net force is the overall force acting on an object after all the individual forces are combined.

Front

If two forces of 2 N and 4 N act in the same direction, what is the net force?

Back

6 N in the direction of the forces.

Front

What does it mean for a vehicle to have a changing velocity?

Back

It means the vehicle is either speeding up, slowing down, or changing direction.

Front

What is the formula for nitrogen trifluoride?

Back

NF3.

Front

What is a free-body force diagram?

Back

A free-body force diagram is a graphical representation of all the forces acting on an object.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes direction.