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
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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
The strong force is to gluons as the gravitational force is to
A) Z particles. B) quarks. C) photons. D) gravitons. E) neutrinos.
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
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