Physics final

Front

What is the resultant speed of a motorboat traveling at 4 km/h in still water across a river flowing at 3 km/h?

Back

5 km/h

Front

How does the density of a pure gold ring compare to that of a bar of pure gold?

Back

The same

Front

What distance does a freely-falling object fall from rest in 3 seconds?

Back

45 m

Front

If the distance between two asteroids doubles, how is the gravitational force between them affected?

Back

The force would be a quarter what it was.

Front

Does a wooden log float higher in water or oil?

Back

In water.

Front

Define density in physics.

Back

Density is mass per unit volume, typically expressed in kg/m³.

Front

What is the formula for calculating gravitational force between two masses?

Back

F = G * (m1 * m2) / r², where G is the gravitational constant.

Front

Explain the concept of buoyancy.

Back

Buoyancy is the upward force exerted by a fluid that opposes the weight of an object immersed in it.

Front

What is the principle of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity representing distance over time, while velocity is a vector quantity that includes direction.