Week 19 Practice: Geomagnetism (P)

Front

The last flip of Earth's magnetic poles was ________ years ago.

Back

700,000

Front

Earth's geomagnetism is primarily caused by the movement of liquid ___ within the Earth's outer core.

Back

iron

Front

The compass needle points towards magnetic ___, which varies across different locations on Earth's surface.

Back

north

Front

The auroras are centered on the _________ pole.

Back

geomagnetic

Front

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30m/s. The ball has ____ kinetic energy. Calculate it.

Back

945 J

Front

What is geomagnetism?

Back

Geomagnetism refers to the magnetic field generated by the Earth, which affects compass readings and navigation.

Front

What is the primary component of Earth's outer core that contributes to geomagnetism?

Back

Liquid iron.

Front

What is the significance of the geomagnetic poles?

Back

The geomagnetic poles are the points on Earth's surface where the magnetic field is vertical, influencing compass behavior.

Front

How does the movement of molten iron affect Earth's magnetic field?

Back

The movement generates electric currents, which in turn produce magnetic fields, contributing to geomagnetism.

Front

What is the relationship between kinetic energy and mass?

Back

Kinetic energy (KE) is directly proportional to the mass (m) of an object and the square of its velocity (v): KE = 1/2 mv².