Physics, 14.06.2021 07:10 brookeguilford
Choose the letter of the best answer and write it on your notebook/on a separate
sheet of paper.
1. Which of the following is needed for convection to happen?
a. Electromagnetic waves c. Fluid/Gas
b. Fire d. Light in the form of ray
2. What word means the same as âwarm fluid moves from place to place, carrying energy
with itâ?
a. Conduction c. Inflammation
b. Convection d. Radiation
3. What word means the same as âenergy is passed between particles through direct
collisionsâ?
a. Condensation c. Convection c. Conduction d. Radiation
4. Which would be an example of a heat insulator?
a. Copper pot c. Iron nail
b. Gold bracelet d. Wooden spoon
5. Which of the following reasons why majority of people wear white or lightcolored clothes
in summer?
a. Because it reflects less heat
b. Because it reflects more heat
c. Because it transfers less heat
d. Because it transfers more heat
6. A repelling force occurs between two charged objects when the charges are of
.
a. unlike signs c. equal magnitude
b. like signs d. unequal magnitude
7. Charge is not easily transferred in.
a. conductors c. semi-conductors
b. not conductors d. insulator
8. Which of the following is the Law of Electric Charge?
a. opposite charges repel; like charges attract
b. like charges repel; opposite charges attract
c. neutral objects attract charged object
d. neutral objects attract charged object
9. What happens when a rubber rod is rubbed with a piece of fur, giving it a negative
charge?
a. Protons are removed from the rod.
b. Electrons are added to the fur.
c. The fur is left neutral.
d. The rod gains protons.
10. If you comb your hair and the comb become positively charged, what will happen to your
hair?
e. It will remain unchanged.
f. It will become positively charged.
g. It will be repelled by the comb.
h. It will become negatively charged.
Answers: 3
Physics, 22.06.2019 08:00
Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.
Answers: 2
Physics, 22.06.2019 09:00
Sobre transformaçÔes cĂclicas, sĂŁo feitas algumas afirmaçÔes, determine quais estĂŁo corretas. i â a variação de energia interna em uma transformação cĂclica Ă© nula; ii â o trabalho, em uma transformação cĂclica, Ă© sempre positivo; iii â ao completar um ciclo, o gĂĄs tem a mesma temperatura com a qual começou a transformação; iv â uma transformação cĂclica Ă©, obrigatoriamente, composta de transformaçÔes conhecidas, como adiabĂĄtica, isocĂłrica, etc: a) i e iii b) i e ii c) ii e iii d) i e iv e) iii e iv
Answers: 1
Physics, 22.06.2019 12:30
When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)
Answers: 2
Physics, 22.06.2019 16:40
Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel
Answers: 3
Choose the letter of the best answer and write it on your notebook/on a separate
sheet of paper.
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