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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. What is not a factor that reduces the required number of kWh for heating? A. Higher lighting level B. Greater ventilation C. Greater number of people occupying building D. Greater use of electronic equipment

[Answered] A conductor carries current of 0.2A. Find the amount of charge that will pass to the cross section of the conductor in 30 seconds. How many electrons will flow if the charge of electrons is [tex]$1.6 \times 10^{-19} C$[/tex]?

[Answered] The density of gold is $19.3 g / cm ^3$. What is the volume of a 13 g gold nugget? (Density: $D=\frac{m}{v}$ )

[Answered] The speed of light in amber is $1.94 * 10^{8} m / s$. What is the index of refraction for amber?

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

[Answered] The Rocket Club is planning to launch a pair of model rockets. To build the rocket, the club needs a rocket body paired with an engine. The table lists the mass of three possible rocket bodies and the force generated by three possible engines. | Body | Mass (kg) | Engine | Force (N) | |---|---|---|---| | 1 | 0.500 | 1 | 25 | | 2 | 1.5 | 2 | 20 | | 3 | 0.750 | 3 | 30 | Based on Newton's laws of motion, which combination of rocket bodies and engines will result in the acceleration of 40 [tex]$m / s ^2$[/tex] at the start of the launch? A. Body 3 + Engine 1 B. Body 2 + Engine 2 C. Body 1 + Engine 2 D. Body 1 + Engine 1

[Answered] The loudness, [tex]$L$[/tex], measured in decibels (Db), of a sound intensity, I, measured in watts per square meter, is defined as [tex]$L =10 \log \frac{ l }{ l _0}$[/tex], where [tex]$l _0=10^{-12}$[/tex] and is the least intense sound a human ear can hear. What is the approximate loudness of a rock concert with a sound intensity of [tex]$10^{-1}$[/tex]?

[Answered] The volume of a gas varies directly with temperature, [tex]$T$[/tex], and inversely with pressure, [tex]$P$[/tex]. Which of the following equations represents that relationship? [tex]$P=k T V$[/tex] [tex]$P=k \frac{T}{V}$[/tex] [tex]$P=k \frac{V}{T}$[/tex] [tex]$P=k \frac{1}{T V}$[/tex]

[Answered] If you have a voltage of 120 volts entering your house and a light bulb with 0.625 amperes flowing through it, how many watts is your light bulb? A. 25 watts B. 50 watts C. 150 watts D. 75 watts