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Questions in physics

[Jawaban] Using the formula $R=\frac{\Delta T}{\alpha}$ where $\alpha$ is the coefficient of thermal expansion, and $\Delta T$ is the change in temperature, how would you solve for $\Delta T$? a. $\Delta T=R \alpha$ b. $\Delta T=R+\alpha$ c. $\Delta T=\frac{R}{a}$ d. $\Delta T=\frac{a}{R}$

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

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

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

[Jawaban] Which of the following are injuries that can occur if there is an arc flash? A. Burns B. Eye injuries C. Hearing damage D. All of the above

[Jawaban] Which correctly lists the two elements that make up the empty space in the universe? A. ice and debris B. debris and dark matter C. dark matter and dark energy D. dark energy and dust

[Jawaban] Calculate the change in the kinetic energy (KE) of the bottle when the mass is increased. Use the formula [tex]K E=\frac{1}{2} m v^2[/tex], where [tex]m[/tex] is the mass and [tex]v[/tex] is the speed (velocity). Assume that the speed of the soda bottle falling from a height of 0.8 m will be [tex]4 m / s[/tex], and use this speed for each calculation. Record your calculations in Table A of your Student Guide. When the mass of the bottle is 0.125 kg, the KE is [tex]kg \cdot m ^2 / s ^2[/tex]. When the mass of the bottle is 0.250 kg, the KE is [tex]kg \cdot m ^2 / s ^2[/tex]. When the mass of the bottle is 0.375 kg, the KE is [tex]kg \cdot m ^2 / s ^2[/tex]. When the mass of the bottle is 0.500 kg, the KE is [tex]kg \cdot m ^2 / s ^2[/tex].

[Jawaban] The potential energy, [tex]$P$[/tex], in a spring is represented using the formula [tex]$P=\frac{1}{2} k x^2$[/tex]. Lupe uses an equivalent equation, which is solved for [tex]$k$[/tex], to determine the answers to her homework. Which equation should she use? [tex]$k=2 P x^2$[/tex] [tex]$k=\frac{1}{2} P x^2$[/tex] [tex]$k=\frac{2 P}{x^2}$[/tex] [tex]$k=\frac{P}{2 x^2}$[/tex]

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

[Jawaban] When working with electricity, the clothing you wear next to your skin should be made from which type of material? A. Natural fibers, such as cotton or wool B. Acetate or rayon C. Nylon