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Questions in physics

📝 Answered - Which units are used to measure force? A. newtons B. feet C. miles D. grams

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

📝 Answered - A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current? A. 0.5 A B. 2A C. 4A D. 8A

📝 Answered - When using a shunt to determine the current in the circuit, a multimeter is set to measure: A. Resistance B. Voltage C. Current D. Frequency

📝 Answered - The loudest sound measured one night during a hockey game was 112 dB. The loudest sound measured during a hockey game the next night was 118 dB. What fraction of sound intensity of the second game was the sound intensity of the first game? [tex]L=10 \log \left(\frac{1}{t_0}\right)[/tex] [tex]L=[/tex] loudness, in decibels [tex]I=[/tex] sound intensity, in watts [tex]/ m ^2[/tex] [tex]I_0=10^{-12} watts / m^2[/tex] A. 0.25 B. 0.78 C. 0.95 D. 0.99

📝 Answered - The loudness, [tex]$L$[/tex], measured in decibels (Db), of a sound intensity, [tex]$I$[/tex], measured in watts per square meter, is defined as [tex]$L=10 \log \frac{I}{I_0}$[/tex], where [tex]$I_0=10^{-12}$[/tex] and is the least intense sound a human ear can hear. Jessica is listening to soft music at a sound intensity level of [tex]$10^{-9}$[/tex] on her computer while she does her homework. Braylee is completing her homework while listening to very loud music at a sound intensity level of [tex]$10^{-3}$[/tex] on her headphones. How many times louder is Braylee's music than Jessica's? A. [tex]$\frac{1}{3}$[/tex] times louder B. 3 times louder C. 30 times louder D. 90 times louder

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

📝 Answered - Which explains the information needed to calculate speed and velocity? A. Both require the total distance, but velocity also requires time and displacement. B. Both require time, but velocity requires displacement and speed requires distance C. Speed requires displacement, while velocity requires distance. D. Speed does not require time, while velocity does require time.

📝 Answered - Which equation is most likely used to determine the acceleration from a velocity vs. time graph? [tex]a=\frac{t}{\Delta v}[/tex] [tex]m=\frac{v_2-v_1}{x_2-x_1}[/tex] [tex]a=\frac{\Delta v}{m}[/tex] [tex]m=\frac{x_2-x_1}{y_2-y_1}[/tex]

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