Physics, 03.04.2020 04:05 bryan12376

What is its time interval between the release of the ball and the time it reaches its maximum height? Its initial vertical speed is 9.5 m/s and the acceleration of gravity is 9.8 m/s2. Neglect air resistance.

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Answer from: INEEDTOPASSS

0.93 seconds is the time interval between the release of the ball and the time it reaches its maximum height.

Explanation:

Given that,

Initial speed of the ball, u = 9.5 m/s

When it reaches to the maximum height, final speed of the ball, v = 0

It is required to find the time interval between the release of the ball and the time it reaches its maximum height. Using third equation of motion to find the maximum height reached.

$v^2-u^2=2as\\\\s=\dfrac{u^2}{2g}\\\\s=\dfrac{(9.5)^2}{2\times 9.8}\\\\s=4.6\ m$

Now using second equation of motion to find the time interval between the release of the ball and the time it reaches its maximum height as :

$s=ut+\dfrac{1}{2}at^2\\\\s=ut-\dfrac{1}{2}gt^2\\\\4.6=9.5t-\dfrac{1}{2}\times 9.8t^2\\\\t=0.93\ s$

So, 0.93 seconds is the time interval between the release of the ball and the time it reaches its maximum height.

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

Your answer is c. explanation: plasma is the fourth state of matter, derived from the gaseous state of matter. plasma can contain free electrons and/or ions. while plasma is never neutral, it can either be positively or negatively charged. gases, however, are electrically neutral.

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