For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?

A. 13

B. 14

C. 26

D. 27

E. 40

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?

How should the flight controls be held while taxiing a tricycle-gear equipped airplane with a left quartering tailwind?

Easy yes or no question! Do phytoplankton turn carbon dioxide to oxygen?

Bridget is riding her bicycle up a hill. Which statements are correct? Check all that apply. Bridget is transferring energy to the bicycle. The bicycle is using energy to do work. Bridget has kinetic energy. The bicycle has potential energy.

Why is a control important in an experiment?

Which planet, when viewed through a telescope, appears as a reddish ball interrupted by some permanent dark regions that change intensity?

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference minima at / pm 35.09 degrees on either side of the central bright spot.

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose? Explain.

a the average distance from the Sun to Pluto is approximately 6.10 x 1 0 ^9. how long does it take light from the sun to reach Pluto?