A pendulum makes 40 vibrations in 20 seconds. Calculate the period?

What type of radiation is trapped on earth's surface by the greenhouse effect?

What does a hurricane hunter do

Which of the following are examples of radiation? (Choose all that apply)

You need to connect your doorbell to a battery. You should select wire that will

Most scientists believe the Big Bang Theory explains which of the following questions? A. How our planets and moons formed B. How our Universe began C. How the sun turns hydrogen into helium D. How fast light travels through space

Which possible discovery would be attributed to an inorganic molecule? a protein that contains more energy than lipids a fireproofing spray used in firefighting a new energy-efficient fuel source a synthetic polymer that resists degrading

A light beam in air strikes the surface of water at an angle of 26° with the normal. When it enters the water it bends toward the normal, making an angle of 19° with it. The velocity of light in air is approximately 300,000 km/s.

Which best explains the relationship between the speed of sound and the medium through which it passes?

g The magnetic force on a charged particle A. depends on the sign of the charge on the particle. B. depends on the velocity of the particle. C. depends on the magnetic field at the particle's instantaneous position. D.

How fast must a 1000 kg car be moving to have a kinetic energy of 1.0 kWh