The universe refers to?

A. Our solar system

B. everything that exist

C. stars

D. galaxies

What are three characteristic properties of matter?

You must participate in minutes of physical activity, five days per week. A. 45 B. 20 C. 60 D. 30

What do scientists believe the moon's core might be formed of? a. Iron c. Carbon b. Silicon d. Lava

The energy levels for electrons vary from one element to another. True or False

What is the gravitational potential energy of a ball of mass 2.00 kg which is tossed to a height of 13.0 m above the ground? Answer in J, taking the potential energy to be 0.00 J at the ground.

What is the period of a wave if the frequency is? 5 Hz

Which of the following statements about dark matter and dark energy is/are true? Choose one or more: Both exceed the matter-energy equivalent of luminous matter. Dark matter has only an attractive gravitational effect, while dark energy is repulsive.

On the sun is the corona above the photosphere?

Which sequence shows electromagnetic waves arranged from shorter to longer wavelengths?. A. visible light, infrared radiation, microwaves, and ultraviolet rays. B. infrared radiation, Visible light, ultraviolet rays, microwaves. C.

Will the April 29th 2020 astroid be the end of humanity as we know it?