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Questions in physics

[Done] In physics class, Carrie learns that a force, [tex]$F$[/tex], is equal to the mass of an object, [tex]$m$[/tex], times its acceleration, [tex]$a$[/tex]. She writes the equation [tex]$F=m a$[/tex]. Using this formula, what is the acceleration of an object with [tex]$F=7.92$[/tex] newtons and [tex]$m=3.6$[/tex] kilograms? Express your answer to the nearest tenth. Note: The unit for Force (the Newton) is measured in [tex]$\frac{k g / m}{s^2}$[/tex]. A. [tex]$0.5 \frac{m}{s^2}$[/tex] B. [tex]$1.8 \frac{m}{5^2}$[/tex] C. [tex]$2.2 \frac{m}{ s ^2}$[/tex] D. [tex]$4.9 \frac{m}{5^2}$[/tex]

[Done] Select the best answer for the question. 16. How do liquids and gases differ when pressure is applied to them in a container? A. Liquids easily expand when pressure is applied, but gases don't. B. Gases easily expand when pressure is applied, but liquids don't. C. Liquids easily compress when pressure is applied, but gases don't. D. Gases easily compress when pressure is applied, but liquids don't.

[Done] How does an object become negatively charged? A. It gains electrons. B. It loses electrons. C. It gains protons. D. It loses protons.

[Done] The equation [tex]f=v+at[/tex] represents the final velocity of an object, [tex]f[/tex], with an initial velocity, [tex]v[/tex], and an acceleration rate, [tex]a[/tex], over time, [tex]t[/tex]. Which is an equivalent equation solved for [tex]t[/tex]? A. [tex]t=\frac{f-v}{a}[/tex] B. [tex]t=\frac{f-a}{v}[/tex] C. [tex]t=a(f-v)[/tex] D. [tex]t=v(f-a)[/tex]

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

[Done] 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.

[Done] 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]

[Done] 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].

[Done] 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?

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