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Questions in physics

[Terjawab] A metal box and a wooden box having the same weight are moved on the same surface by equal forces. In your opinion, which of them will experience greater friction? Justify your answer.

[Terjawab] Electrical circuits should always be treated as if: A. They are DC (direct current) B. They are energized (live) C. They are always AC (alternating current) D. They are de-energized

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] What is an arc flash? A. A slow release of heat B. A type of grounding system C. A release of electrical energy caused by a fault D. A method of insulation

[Terjawab] Which statement best describes how waves carry energy? A. Energy moves from one place to another through the wave. B. Energy increases as it moves through the wave. C. Energy is completely consumed by the beginning of the wave. D. Energy builds through the wave and is released at the end.

[Terjawab] $\frac{k q_1 q_2}{r^2}$ D. $F=\frac{4_1 4_2}{4 \pi \varepsilon_0 r^2}$ 10. The Imaginary surface necessary to apply Gass Law is called Bipolar Surface Q. Gaussian Surface 1. None of the above A. Cartestan Surface. 11. If the surface under consideration is not perpendicular to the field lines then the expect son to given as A. $\Sigma E A \cos \theta$ b. $\sum E A \cos \pi$ C. $\Sigma E \cos \theta$ D. $\sum A \cos \theta$ 12. What is the integral form of the expression $\sum F A \cos \theta=\frac{q}{\varepsilon_0}$? A. $\int E \cdot d A=\frac{?}{\varepsilon_0}$ B $\int E+A=\frac{q}{\varepsilon_0}$ C. $\int A$. D. $\int B / A=\frac{9}{\varepsilon_0}$ 13. The expression for current density flowing through a conductor is represented by A. qnAl B. qnAd C. qnAVd D. qnVd 14. A 10 m length of copper wire has a diameter of 1.5 mm . Find the current density if it carries 1.2A. A. $6.7897 \times 10^6 A / m ^2$ B. $6.7897 \times 10^5 A / m ^2$ C. $6.7897 \times 10^4 Alm ^2$ D. 6789 15. Which of the following expressions is not a representation of Ohm's law? x. $\frac{\pi}{\sigma A}$ B. $\frac{11 . \rho}{A}$ C. jpl D. pE 16. The null deflection of a Potentiometer refers to A. When the galvanometer attached to the jockoy deflects to the left B. When the galvanometer attached to the jockey deflects to the right C. When the galvanometer attached to the jockey rotates through 180 degrees

[Terjawab] Select all the correct answers. According to Ohm's law, which is stated as [tex]$I=V \div R$[/tex], which two sentences are true? A. If the current increases, then the resistance increases. Assume voltage is constant. B. If the resistance decreases, then the current increases. Assume voltage is constant. C. If the voltage increases, then the resistance decreases. Assume current is constant. D. If the voltage increases, then the current increases. Assume resistance is constant. E. If the voltage increases, then the current decreases. Assume resistance is constant.

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] A 1.5 litre sample of a gas having density 1.25 kg/m³ at 1.0 atm and 0°C was compressed to 575 atm resulting in a gas volume of 3.92 cm³ in violation of Boyle's law. What is the final density of this gas? A) 568.3 kg/m³ B) 478.3 kg/m³ C) 278.3 kg/m³ D) 378.3 kg/m³

[Terjawab] Which one of the following quantities has a correct unit? | | Quantity | Unit | | :---- | :---------------- | :-------- | | A | period | m | | B | pulse speed | km·h⁻¹ | | C | frequency | s | | D | potential energy | J·s⁻¹ |