PHYSICAL SCIENCE SUMMATIVE TEST Q4

Front

Where is Polaris located in the night sky when you are standing at the equator?

Back

Polaris appears closer to the horizon when viewed from the equator.

Front

What is the perceived length of a 5m ship travelling at .637c?

Back

The perceived length of the ship is 3.55m due to length contraction.

Front

What happens to the height of a ball as it rolls down an inclined plane if the external force is removed according to Galileo?

Back

The original height is equal to the initial height.

Front

What does the law of periods state in planetary motion?

Back

The square of the orbital period of a planet is proportional to the cube of the mean distance from the sun.

Front

Why do you get sunburn after taking a swim at the beach on a sunny day?

Back

Because the ultraviolet rays from the sun damage the skin.

Front

What is the definition of length contraction in physics?

Back

Length contraction is the phenomenon where an object in motion is measured to be shorter in the direction of motion relative to a stationary observer.

Front

What is the formula for calculating the perceived length of an object moving at relativistic speeds?

Back

L = L0 * sqrt(1 - v^2/c^2), where L0 is the proper length, v is the velocity, and c is the speed of light.

Front

What is the significance of the law of ellipses in planetary motion?

Back

The law of ellipses states that planets move in elliptical orbits with the sun at one focus.

Front

What is the definition of ultraviolet (UV) radiation?

Back

Ultraviolet radiation is a type of electromagnetic radiation with a wavelength shorter than visible light, which can cause skin damage.

Front

What is the relationship between force and motion according to Newton's first law?

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.