Atoms of which element have two protons and two electrons?

a. Carbon

b. Helium

c. Hydrogen

d. Lithium

Why are lunar calendars not more widely used today

In a vacuum, two particles have charges of q1 and q2, where q1 = + 4.2C. They are separated by a distance of 0.31 m, and particle 1 experiences an attractive force of 4.5 N. What is the value of q2, with its sign?

You did 150 joules of work lifting a 75 newton backpack. How high did you life the backpack?

What determines the color of light

Why is information about comets, asteroids, and meteoroids important for understanding the development of the solar system?

Why is it important for engineers to design bumper cars safely

What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?

Which statement describes how light behaves when it strikes a translucent material? A. Light is scattered. B. Light is transmitted. C. Light is reflected. D. Light is absorbed.

A certain gas is present in a 15.0 l cylinder at 2.0 atm pressure. if the pressure is increased to 4.0 atm the volume of the gas decreases to 7.5 l.

Choose all the answers that apply. To qualify as a planet, a celestial object must: have an irregular shape revolve around the sun orbit in a clear area have enough gravity to have a spherical shape have a satellite