An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?

a. 11
b. 12
c. 23
d. 34
e. 35


b

Physics & Space Science

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The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that ________

A) the planets are always accelerating B) a force is acting on the planets C) the planets will eventually fall into the Sun D) the planets have angular momentum

Physics & Space Science

The strong force is to gluons as the gravitational force is to

A) Z particles. B) quarks. C) photons. D) gravitons. E) neutrinos.

Physics & Space Science

In order to overcome a surface tension of a fluid, a force of 1.35 × 10^?2 N is required to lift a wire ring of circumference 13.0 cm. What is the surface tension of the fluid?

a. 0.052 N/m b. 0.104 N/m c. 0.552 N/m d. 5.19 N/m e. 17.6 N/m

Physics & Space Science

A bridge that was 8.3 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge, the road on the far side is 2.0 m lower than the road on this side

a. 5.0 m/s c. 13 m/s b. 7.8 m/s d. 25 m/s

Physics & Space Science