Which of Earth's four basic movements causes seasonal climate changes on Earth? Earth's annual orbit around the sun at a 23.5 degrees permanent tilt gives direct sunlight to different areas during its 365 day orbit.
Earth's 24 hour rotation causes it to cool at night and warm during the day.
Earth's movement with the Milky Way Galaxy passes through warmer areas of the Universe.
Earth's movement with the solar system around the Milky Way Galaxy passes through warmer areas of the galaxy.

What are the applications of electromagnetic waves

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?