how-much-work-is-done-by-a-pitcher-in-throwing-a-02-mathrmkg-ball-at-a-speed-of-30-mathrmm-mathrms-a

Question

How much work is done by a pitcher in throwing a 0.2 $\mathrm{kg}$ ball at a speed of 30 $\mathrm{m} / \mathrm{s}$ ?
(A) 3 $\mathrm{J}$
(B) 9 $\mathrm{J}$
(C) 30 $\mathrm{J}$
(D) 90 $\mathrm{J}$

Sachin Rao · Accepted Answer

the problem. We have to find how much work is done by a picture in throwing a 0.2 kg ball at a speed of 30 m per second mass of ball, 0.2 kg and speed is 30 m per second. So here we know that it has some kinetic energy. So this kind of energy comes from the work. Done. Buy a picture. So this program should be equal to this kind of energy which is half and the square half mass 0.2 into vis 30 square. So this is a cold 0.1. Multiply with 30 square. So this is equal to 90 jewels. So wagon is equal to 90 June. Now we will check our options Option B s 90 jewel auction. They will be correct. Thank you.

Surjit Tewari · Answer

question number 17 to solve this question. First of all, we have to understand what? What can I gt Autumn is what energy? Yeah, According to this totem, the work done on a body by any external force is it could do the change in gonna be gonna be off the body. This means that it would does an external work on about the press are moving the constantly lusty, then the change in its can It big energy is equal to do that. Working in the given question, we are given that a baseball pitcher has thrown a ball with velocity. Me 32 Mita Second, the musk off the ball is digital wind one full by Iggy. And we have to find the world on the ball by the picture. No applying working a GTO around here be here. The blue is good of them be scrapped which is the Guinan kind of dignity off the ball. Thus for come by the carriage in a 0.1 45 into square on calculating we get w equals 70 four point 24 Jews. This is a required weapon by the which

Keshav Singh · Answer

how much off work is done by immediately picture when he tells, if possible. Well, we know by the work kinetic energy theorem that the work done is the change in kinetic image. What&#x27;s the baseball and the change? Kind of the energy down to Kate is 1/2 him. Me squid. The mess. Often baseball is roughly 150 grams. So thats 0.15 kilograms and if possible as an average speed, 14 point to you, just sick. So from this we can see that the work done I&#x27;m throwing Impossible is 123 0.6 jewels. This means it acquires 100 and training 3.6 jewels of energy. So he made you get a possible second year. If the picture were to consume in 1520 calorie meal, how many pictures would be able to go? Well, assuming nobody he&#x27;s only 20% efficient. We can woke up this number to be efficiency kinds. Amount of calories consumed. 1520 calories, kind of the number Jules May color, which is 4186 jewels. Kevin, all of this. It&#x27;s divided by the number of jewels. Very quiet, one possible, and we&#x27;ve calculated this before to be. I don&#x27;t drink 3.6 cream, 3.6 Jules, her pitch and some simplification. We can see the number of fastballs it can be thrown by immediately. Picture. After consuming 1500 20 calories, it&#x27;s 10,200 95 about sports.

Surjit Tewari · Answer

21 Mosses, I mean called toe 0.14 by K G. The initial can etiquette energy is he called toe. It won seven Jules Burton by the gravity force at the height off six meter is tableau is equality Oh minus MGI taking the downward direction as negative into six minus 0.145 in value, off acceleration due to gravity. 10 in your six. This will give us the work as my necessary born seven Jules in the Bybee, we have to find the final Connecticut energy. The final kinetic energy is equal to the initial kinetic energy. Bless. We&#x27;re been This is equal 8.7 minus. It won seven is equal to zero Jules. So final Canada Gennady is zero. See, by the final velocity, we&#x27;ll also be zero as final kinetic energy e f is equality, Tzeitel

Jordan Gassaway · Answer

Okay. So to find the work done by a resistance as this baseball travels from home plate to the bleachers, we&#x27;re basically just going to look at the difference in mechanical energy in between the starting and the ending positions. Since air Resistance is the only non conservative force acting on the baseball, the work done by a resistance is going to be equal to that difference in mechanical energy. So with that, we can go ahead and start with piece of f equals you see, by plus W someday, um, expanding e into K plus you we get case of f plus use of that equals case of I I plus use of I plus W sub A and then, um, plugging in for K and you again. You is just going to be gravity. Since that&#x27;s the only ah other force acting on the baseball, we get 1/2 him the sub f squared plus him G H Sabbath equals 1/2 and visa by squared plus MGH. So by plus W Sabei uh, h so by zero since we&#x27;re going to draw our gravitational zero potential at the point the baseball was released. From there, we just need to solve for w Sabei and plug in the values for M visa by Visa, Beth and H or HTML Rather. And that will leave us with, ah, work of minus 38.5 jewels. Can we have that minus sign? Because it&#x27;s working against the baseball and energy is leaving the system?

Ze-Han Lee · Answer

All right. So this problem, we have a book. Um, which way&#x27;s and me quote two kilograms. Repetition of force on this book. His G equal am time stream. So which is 20 Newton&#x27;s So here will say she is 10 meters per second squared, OK. And ah, if we lifted the book from the ground to the table as we could see that the direction is pointing out right? Very funny up by the gravitation of fools is appointing down. So the work done by the gravitation is negative. So the work down my gravitational forces negative 20 new tis which is that which is the gravitational force times the business which is the 1.5 meters. So it&#x27;s a negative 30 Jos

Problem

A 10 $\mathrm{kg}$ block is placed at the top of …

Problem 17 Easy Difficulty

How much work is done by a pitcher in throwing a 0.2 $\mathrm{kg}$ ball at a speed of 30 $\mathrm{m} / \mathrm{s}$ ?
(A) 3 $\mathrm{J}$
(B) 9 $\mathrm{J}$
(C) 30 $\mathrm{J}$
(D) 90 $\mathrm{J}$

Answer

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