Atoms of which element have two protons and two electrons?

a. Carbon

b. Helium

c. Hydrogen

d. Lithium

Why is Pluto no longer considered a planet? A. It is not large enough to be a planet. B. Pluto does not orbit the sun as originally thought. C. It does not orbit in an area clear of other celestial bodies. D.

A horse trots away from its trainer in a straight line. moving 38 m away in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed and average velocity?

How do gamma rays differ from visible light

Cosmological models do not give a supernatural cause or meaning to physical events but try to explain the universe using only the laws of mathematics and nature. True False

Car A travels from New York to Miami at a speed of 25 m/s. Car B travels from New York to Chicago, also at a speed of 25 m/s. Are the velocities of the cars equal? Explain.

A. Which skill related fitness component is your strongest and weakest?

A 100 N box is placed on an inclined plane that makes a 30° angle with the horizontal. Calculate the component of gravitational force that acts down the inclined plane. A. 25 N B. 50 N C. 87 N D. 100 N

Approximately how many kelvins are equal to 60 c? a. 289k b. 323k c. 333k d. 413k

What are two ways to change velocity?

What is the main optical element of a refracting telescope?