1cat2ferrets
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Posts posted by 1cat2ferrets
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from a MichaellRunyon. Don't open it people. He's a scumbag spammer.
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Saw "Law abiding citizen" last night, and, boy what a movie? It's rated R
of course because of language and violent scenes so beware.
This movie really kept us on the edge of our seats.
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I had an enormous crush on him in the 80's. Heard he was molested when he was 14yo.. Probably was the cause of his drug addiction.
Very sad still, though.
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for the answers. We needed the explanations and both helped quite a bit.
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Just wanted to let the physics experts to know that I've posted 2 questions that are baffling my son and I. Could you please go over there and take a look? Thanks!
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1. What force does the earth's gravity exert on a 81kg astronaut who is orbiting in a space station at a distance from the SURFACE of the earth equal to 2 earth radii? answer must be in newtons.
2. The astronaut in the above was launched into space by a Saturn rocket. The upward acceleration of a Saturn rocket shortly after blast-off in 80m/s^2. When the Saturn rocket is accelerating, what is the apparent weight of astronaut, that is, what does the astronaut experience as the weight of his body?(Hint: Keep in mind the definition of weight and that more than acceleration due to gravity is acting on the astronaut.) Answer must be in Newtons.
TIA!
Both of these questions have us stumped.
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Thanks so very much for the help, we truly appreciate it, mpcTutor!
You're a godsend.
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I think we got the first question so I'll type it out because it's part of other questions that we're having trouble with.
1. A child riding a horse on the outer edge of a merry-go-round has a rotational speed of 5RPM and a tangential speed of 8m/s. A child riding a horse halfway between the outside and center of the merry-go-round would have a. the same rotational speed and half the tangential speed, b. the same rotational speed but twice the tangential speed, c. half the rotational speed and half the tangential speed,d. half the rotational speed but the same tangential speed.
My son chose answer B.
Here are the two questions we're having trouble with:
2. What factor would INCREASE the angular MOMENTUM experienced by the child riding on a horse at the outer edge of the merry-go-round?
a. The child changes horses and moves to one nearer the center of the merry-go-round, b. The child wears a 3kg backpack, c. The merry-go-round slows down, d. none of these.
My son and I think it's A. Are we right?
3. If the child riding on the outer edge of the merry-go-round in the first question above(my question#1) has a mass of 25kg and is 15m from the center of the ride, what would be his or her angular momentum?
the choices are:
a. 3kg*m^2/s b. 30kg*m^2/s c. 300kg*m^2/s d. 3000kg*m^2/s
the angular momentum formula in the textbook is:
angular moment= rotational inertia * rotational velocity
PLEASE help us figure these two questions out!
TIA!
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for the help. At least, my son and I are almost figuring this stuff out! LOL
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ok, here goes..
a person has a mass of 50kg sits on a lever and lifts a mass of 100kg a distance of 5m. what is the mechanical advantage of the lever?
a. 1 b. 1 1/2 c. 2 d. 50 or e. 100?
my guess is d. 50 because M=f*d.
the largest dinosaur was the brachiosaurus, which had a mass of 77,000kg.
what was the weight of the dino in newtons?
i know that 1kg=9.8N so, 77,000kg * 9.8N=754600N, right?
second part of question: if the dino had lived on a planet whose gravity was half that of earth's what would have been its mass? what would its weight in newtons have been?
ok, I know that mass doesn't change no matter where it is, so the answer is 77,000kg, right? I don't know how to get the weight, or would it be the same also??
TIA!
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as well as biology and chemistry. I found calculus easy, but geometry wasn't my "thing".
Yes, it's nice to be able to share one's talents on this board and it's also nice to ask for help when needed.
Thanks so much, Ladies!:D
I'm sure I'll have more questions pertaining to Physics in the future.:tongue_smilie:
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you were a physics major??? Oh my, you must be a BRAIN!!
God Bless you!!
I was a biology major back in the day and took a general physics course, but promptly forgot it..LOL!
Yes, I got the correction, thanks!
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for your help. I despise physics, BTW. This is my son's last course in order to graduate...can't WAIT!!
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OK, my son thinks he's got the first one right, but he's unsure how to complete the second one. Here they are:
1. the first climbers of mt. everest climbed the last 400 meters of the ascent in 4 hours (or about 14,400 seconds). rounding to the nearest hundredth, what was the average speed in meteres per second of the last part of their climb?
the formula he used was: distance=rate * time, so the distance is known and the time is too...so he found that rate=distance/time...
400meters/14,400seconds=0.03m/s for average speed...right?
2. the summit of mt. everest is about 9000 meters above sea level. if the 2 climbers had fallen from the peak to sea level, how long would their fall have lasted? ignore air resistance. show your calculations.
he doesn't know where to go from here. anyone??
TIA!
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He's using the same textbook as one of your kids, Conceptual Physics by Hewitt. He likes it, does yours?
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Thanks for taking the time in answering my questions and in explaining them, Angie! You've been a Godsend.
I may have one or two more for you, if you're up to it. LOL!!!
Thanks again!
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This is what my son has so far:
This has to do with free fall problems.
1. what is the instantaneous speed at the end of 5 secs of a flower pot which has been knocked from a window ledge 200meters from[/the ground? My son figured it out to be 50m/s.B]
He was told that in all cases g=10m.s^2, BTW.
2. How far will the flower pot have fallen in 5 seconds?
using this equation: d=1/2at^2 he got the answer 125 meters
3. Someone reaching out an upper story window catches the flowerpot and then throws it straight back up in the sir at the rate of 10 meteres per second. What would be the instantaneous speed of the flowerpot at the end of 1 second? My son chose 20m/s.
Now we're both stuck on these last two:
4. How many seconds elapse between the time the person throws the flowerpot up and catches it again? The choices are: 1 sec, 2 secs, 10 secs, or none of these.
5. What is the speed of the flowerpot when the person catches it for the second time? The choices are: 0m/s, 5m/s, 50m/s 10m/s, or 20m/s.
Please help!!
TIA
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I heard he finally got his son Sean back from Brazil. That's the best news I've heard in a long time!! Praise the Lord!!
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The tree guy came today to cut down two trees that were close to the house and one of the branches swung towards the house and broke a window. Great something else to fix! That's the kind of day I had. How was your day?[/b]
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One time I ordered $120 worth of books and the mail carrier left it down by the mailbox on the grass almost in the street. Another time, he was aggravated and literally threw a box of books at our double door. My hubby was home THAT day and ran out the door to confront the guy. Now we get better service.:DCOLOR]
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went to the auto mechanic today to have my 9 yo battery changed
before the winter comes and now the "check engine" light is on...typical, huh?
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pop up on here and highlight a post from me. I wasn't trying to start anything, just wondering why she said yikes for. Michael Jackson didn't do the homeschooling, his Nanny did. So I don't think homeschoolers should have anything to worry about.
I really wish you'd LEAVE ME ALONE. I don't know if you're a man or a woman, or perhaps both...pure speculation on my part! But I do wish you and everyone else on this board would STOP bashing Michael Jackson...let him REST IN PEACE!!!
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I was aware of it.
Why do you have to say "yikes" for?
SIGH... physics help once again, please!!
in High School and Self-Education Board
Posted
My son is studying Temperature, heat, and expansion, heat transfer,change of phase, and thermodynamics in physics. Here are some of the problems he's having trouble with:
1. A typical woman gives off heat at the rate of about 8000 calories/hour. How long would a woman have to stay in a bath of 60,000g of 26 degree C water in order to raise the water temperature to 30 degrees C? Presume that all the heat given off by the woman is transferred to the water, and that the water does not lose any heat to the air. show calculations.
We think the formula is Q=mc* change in temperature.
the specific heat of water is equal to 1calorie/g degree C.
2. The specific heat of mercury is .03 calories/g degree C and its boiling point is 357 degrees C. he specific heat of water is 1 calorie/g degreeC. It takes 65 calories of energy to vaporize one gram of mercury and 540 calories to vaporize 1 gram of water. If both substances begin at room temperature (about 22 degrees C), does it take more energy to boil a gram of mercury or a gram of water? show calculations.
3. In 1783 the Montgolfier brothers of France launched what is possibly the first balloon flight carrying passengers--- a duck, a rooster, and a sheep. Their balloon about 35 feet in diameter and constructed of cloth lined with paper, was launched by filling it with smoke. The flight landed safely some 8 minutes later. Explain the physics of this flight (that is, its ascent, descent, and landing.
4. In sub-tropical climates, temperatures occasionally drop below 0 degree C at night. Gardeners in these regions sometimes try to water their plants at night. just before the chill sets in. Why would increasing the water content of a plant make it more resistant to drops in temperature?
I know it's a lot to ask, but we're really stumped and any help would be greatly appreciated.:001_smile: