Exam #1b Dr. Ebert PHHS 2336 Name: Answer each question to the best of your abil

Question

Exam #1b Dr. Ebert PHHS 2336 Name: Answer each question to the best of your ability. Even if you do not know the entire answer, do the best you can as partial credit will be awarded. Good luck! 1. (8 pts.) A sample of an unknown piece of metal is determined to have a mass of 121.268 g and a volume of 9.52 cm. What is the metal's density? 2. (10pts.) A piece of brass has a mass of 63.01 g. A graduated cylinder is partially filled with water to a volume of 22.48 mL. If one completely submerges the piece of brass in the cylinder, the volume reads 30.03 mL (a) What is the density of the piece of brass? (b) If the cylinder had been filled with olive oil (density- 0.79 g/mL at 25°C), would that change the answer calculated in (a)? Why or why not? 3. (8 pts.) You drive from here to Richmond, VA, a distance of 370 km. You stop once for gasand once to eat. If the entire trip takes you 4.5 hours, what was your average velocity? 4. (4 pts.) Match the following force to the correct definition. a. electromagnetic force b. gravitational force c. strong nuclear force d. weak nuclear force involved in the close-range holding of the nucleus of an atom together -acts between electrically-charged particles acts between all masses in the universe, mostly on a large scale -involved in certain nuclear reactions

Explanation / Answer

Q1:

mass , m= 121.268 g.

volume , v =9.52 cm3.

density, p =(m/v) =(121.268/9.52) g/cc =12.738 g/cc

Q2:

(a) volume of the piece of brass = (30.03 - 22.48 ) mL= 7.55 ml = 7.55 cc ( 1 mL water = 1cc water)

mass of the piece of brass = 63.01 g

density of the piece of brass = (mass of the piece of brass / volume of the piece of brass)

= (63.01/7.55) g/cc

=8.346 g/cc (ans)

(b) The volume of the brass metal piece and its mass will not change and hence the density of the material will remain the same.

Q No. 3 :

average velocity = (total displacemet / total time taken) = 370 / 4.5 = 82. 22 km / h (ans)

Q no 4:

a. electromagnetic force - acts between electrically-charged particles.

b. gravitational force- acts between all masses in the universe, mostly on a large scale.

c. strong nuclear force- involved in the close-range holding of the nucleus of an atom together.

d. weak nuclear force - involved in certain nuclear reactions.

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