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Questions in physics

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

📝 Answered - Select the best answer for the question. Which statement accurately describes the relationship between mass and weight? A. An object with twice the mass of another object will weigh four times as much. B. An object with twice the mass of another object will weigh twice as much. C. An object with twice the mass of another object will weigh half as much. D. An object with twice the mass of another object will weigh one-fourth as much.

📝 Answered - The density of measly is [tex]$1.36 \times 10^4 kgm ^{-3}$[/tex] at [tex]$O^{\circ} C$[/tex]. Calculate its value at [tex]$100^{\circ} C$[/tex] and [tex]$22^{\circ} C$[/tex]. Take cubic expansivity of meany as equal to [tex]$180 \times 10^{-6} K$[/tex]

📝 Answered - The density of mercury is [tex]$1.36 \times 10^4 kgm ^{-3}$[/tex] at [tex]$0^{\circ} C$[/tex]. Calculate its value at [tex]$100^{\circ} C$[/tex] and [tex]$22^{\circ} C$[/tex]. Take cubic expansivity of mercury as equal to [tex]$180 \times 10^{-6} K$[/tex].

📝 Answered - An automobile tire at $30.0^{\circ} C$ has a pressure of 3.00 atm. The temperature decreases to $-5.00^{\circ} C$. Assume that there is no volume change in the tire. Formula to use: $\frac{P_1}{T_1}=\frac{P_2}{T_2}$ How does the tire pressure change in response to the temperature change?

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

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

📝 Answered - Which statement describes the appearance of a temperature-vs.-time graph? A. A horizontal line shows that the temperature increases at a constant rate over time. B. A vertical line shows that the temperature decreases at a constant rate over time. C. Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. D. Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

📝 Answered - Select the best answer for the question. 13. What's mass? A. A measure of the amount of matter an object contains B. The force that gravity exerts upon an object C. A measure of an element's attraction for electrons D. The sum of the number of protons and neutrons in an atom

📝 Answered - Select the correct answer. The pressure applied on any object can be calculated by using the following equation: [tex]$P=\frac{F}{A}$[/tex] In the pressure equation, [tex]$P$[/tex] represents the pressure on the object in pascals ([tex]$Pa$[/tex]), [tex]$F$[/tex] represents the force applied on the object in newtons ([tex]$N$[/tex]), and [tex]$A$[/tex] represents the area, in square meters, of the object over which the pressure is applied. What is the pressure applied inside a container having an inner area of 16 square meters over which a force of 1,306 newtons is applied? Note: Answers should be rounded to the nearest whole unit. A. 245 Pa B. 82 Pa C. 163 Pa D. 41 Pa