The atomic number of an element is 19. Which is true of this element?

A.

Each atom has an atomic mass of 19.

B.

Each atom has 19 neutrons.

C.

Each atom has 19 protons.

D.

Each atom forms 19 ions.

A long, cylindrical solenoid with 100 turns per centimeter has a radius of 14.7 cm. If the current through the solenoid changes at the rate 6.21 A/s, what is the emf induced per unit length along the axis of the solenoid?

Which option accurately describes an unbalanced force? Each cement block supports a 2-N force, but when the foundation is built in a staggered pattern, it can support 2,000 N.

What force causes static cling? What two types of charges does this force have?

Which of the following is an example of projectile motion? a. a jet lifting off a runway b. a thrown baseball c. an aluminum can dropped straight down into the recycling bin d. a space shuttle being launched

Why can't conductors generate static electricity when rubbed together? a. They do not contain electrons c. They will direct excess charge to earth b. They do not have ions d. Conductors only store charge

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not

A brick is released with no initial speed from the roof of a building and strikes the ground in 2.50 s, encountering no appreciable air drag.

State 3 properties of air Try your best doesn't have to be all of them

Which of the following statements correctly compares the frequency and energy of infrared waves and ultraviolet waves? A Infrared waves have lower frequencies than ultraviolet waves.

An object in the solar system orbits the Sun and has enough mass that its gravity has pulled it into a spherical shape, but it does not have enough gravity to clear its neighborhood of orbiting debris. This object is classified as: