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IncorrectQuestion 181 ptsA 0.OOSkg plastic bolt falls out . of a plane and falls 30,000 feet before reaching the ground: Assuming air resistance act _ on the bolt w...

Question

IncorrectQuestion 181 ptsA 0.OOSkg plastic bolt falls out . of a plane and falls 30,000 feet before reaching the ground: Assuming air resistance act _ on the bolt with force of 0.0003v, how fast should the bolt be moving just before it hits the ground?mis548.64

Incorrect Question 18 1 pts A 0.OOSkg plastic bolt falls out . of a plane and falls 30,000 feet before reaching the ground: Assuming air resistance act _ on the bolt with force of 0.0003v, how fast should the bolt be moving just before it hits the ground? mis 548.64



Answers

Falling Distance. (Use $4.9 t^{2}+v_{0} t=s$.) a) A bolt falls off an airplane at an altitude of $500 \mathrm{m}$. Approximately how long does it take the bolt to reach the ground? b) A ball is thrown downward at a speed of $30 \mathrm{m} / \mathrm{sec}$ from an altitude of $500 \mathrm{m}$. Approximately how long does it take the ball to reach the ground? c) Approximately how far will an object fall in 5 sec, when thrown downward at an initial velocity of $30 \mathrm{m} / \mathrm{sec}$ from a plane?

Question. 75 states that a parachutist falling vertically at a conference fee of 10 meters per second drops a pen 9 20 meters above the ground. What is the speed of the knife just before it reaches the ground? It's when they're interested here. Sorry. Three initial velocity V not is 10 meters per second. Um, yes. So the first thing we should do establish a positive direction this time, I'll say my positive direction is downward is that's the direction that the night will be moving at. And so, um, going to solve for final velocity, right? So that the expression of final velocities downward equal. Sorry, we not plus g t right here. All these terms a positive because everything's falling in the downward direction. I don't know time, though, unfortunately. So I should look at my other key magic equation to solve for time, not tea plus 1/2 g t squared. I have d I happy. Not so I can substitute these eyes in find Make it 20 plus 10 t plus g over two times t squared. This is a quadratic formula. Gonna I'm not gonna solve it here. However, use whatever you'd like to use to solve these questions. Typically, I use excel, but again, whatever you like to use and as long as you establishes the contract formula and you provide a solution that is typically sufficient. However getting use what if you believe it required It is required to show that work, and you should show hey, solve the quadratic formula. If you do, you get a positive solution of 1.24 seconds. So then, by substitute is in back to my original equation, I find that my final velocity is simply 10 meters per second plus 9.8 tires, 1.24 seconds, which is 22.2 meters per second. Or, if we want to get their single digits, baby 20 meters per second. Because again it is only one secret. Did you write it?

So in this question, we have a parachutist falling a constant velocity off 10 m per second. Andi, uh, we're told that the parachuters drew, then drops a knife. Um, that travels a distance of 20 m. Um, accelerating towards the ground on, we need to work out the speed at which the pen knife hits the ground. Where makes impact Here. Eso we know that So we can say that that from this start of this from the start of this motion here on the pen knife will have 10 10 m per seconds off initial velocity. A Z part has it all. It will retain the the momentum from the from the parachute falling eso We know that the initial lost to you is going to be called 10 m per second Now for the motion of the pen life itself is it's falling. So we know that the the displacement is 20 m as they as we're told in the question, uh, we know that the acceleration as it's falling is going to be 9.81 m per second squared on being asked to find out the initial the final velocity eso we need equation with U S A and V in it for constant acceleration so we can use the equation that V squared is equal to you squared plus two a s eso Now we need to rearrange or not Very range But so for Visa we we take the square root of all of this so there's gonna be the square of you squared plus two A s. We know these all these values so it's it's just plugging the numbers we know into this equation. So you is 10 beats per second and we add, uh, two times the acceleration, which is 9.81 hand ties by the displacement, which is 20 m. I'll be arrived at all. Final velocity off 22 meters per second. Okay, okay.

We have 86 number problem. We need to use a falling object model which is at equal to minus 16 ts square process, whereas should be in feet. So in from this equation, we will be having equal to plus minus asked by 16 undercoat. So what time cannot be negative. So we will ignore negative sign, as is 600 by 16 on the road for four times. And for 1 50 1 50 by foreign did wrote No. 1 54 6.1237 Thank you. Be 6.123 seconds. Thank you.

Question number 46 that initially lost days. You equal to then meet that purse again. This is in the downward direction. The height is X equal to 50. Meet us now using the second question off motion for this site. Article two. You d Yes, uh, in tow, X elation due to gravity. And don't be. It's what this is. 1/4 ticket question and be under solution is equals toe two point Fethi. So guns now the final velocity after this time is equal to we could initial velocity less acceleration due to gravity. In the time this really was the funding lost? Yes, I did so fine it by meter parts again in the downward direction.


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