Physics, 13.01.2021 19:50 smesarahmitchell

Which statement describes an example of destructive interference? A. Light shining on a surface has gaps after passing through two slits.
B. Light shining on a DVD surface produces different colors.
C. The inside of a seashell appears to be many different colors.
D. A lamp lights an area around a corner.

It's A

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Answer from: Quest

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

Answer from: Quest

The actual answer is c force stays the same while direction changes

Answer from: Quest

Let $v_p$ be the velocity of the plane.let $v_w$ be the velocity of the wind.let $v_r$ be the resultant velocity.add the velocities to find the resultant velocity. in the attached picture, i have done the tail-to-tip method: draw one of the vectors, then add the end of the other vector to the tip of the first drawn vector.see diagram.the magnitude of $v_r$ can be found via the pythagorean theorem as this is a right angle triangle. $\begin{aligned} |v_r| & = \sqrt{v_p^2 + v_w^2} \\ & = \sqrt{525^2 + 65^2} \\ & \approx 529.008507 \text{ m/s} \end{aligned}$ to find $\theta$ , use inverse tangent: $\begin{aligned} \tan\theta & = \dfrac{opp}{adj} \\ \tan\theta & = \dfrac{v_w}{v_p} \\ \theta & = \tan^{-1}\left(\dfrac{v_w}{v_p}\right) \\ \theta & = \tan^{-1}\left(\dfrac{65}{525}\right) \\ \theta & \approx 7.06^{\circ} \end{aligned}$ since $\theta$ is in the direction "east of north", a quick convert to "north of east " reveals that 90 - 7.06 = 82.94 = 83.so our resultant is 529 m/s [83° n of e]the answer is a.

Answer from: Quest

The elastic potential energy of a spring is computed by: 1/2 * k * x^2where: k = spring constant = 46 n/m x = displaced length = 0.146 - 0.116 = 0.03 m = 3 cm pe = 0.5*46*.023^2 = 0.012167 j = 12.17 mj is the elastic potential energy stored in the spring.

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Which statement describes an example of destructive interference? A. Light shining on a surface has...