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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 - To determine the change in the x-component of the velocity of an object, subtract the x-component of the initial velocity from the x-component of the final velocity. True False

📝 Answered - Describe the four main types of resistance forces.

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

📝 Answered - Which object would have the most momentum? A. a 500-pound car moving at 20 miles per hour B. a 200-pound car moving at 60 miles per hour C. a 100-pound car moving at 80 miles per hour D. a 50-pound car moving at 100 miles per hour

📝 Answered - How does increasing the amount of charge on an object affect the electric force it exerts on another charged object? A. The electric force increases because the amount of charge has an indirect relationship to the force. B. The electric force increases because the amount of charge has a direct relationship to the force. C. The electric force decreases because the amount of charge has an indirect relationship to the force. D. The electric force decreases because the amount of charge has a direct relationship to the force.

📝 Answered - 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]

📝 Answered - 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.

📝 Answered - How does an object become negatively charged? A. It gains electrons. B. It loses electrons. C. It gains protons. D. It loses protons.

📝 Answered - 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]