Why does the number 54,289.00 have seven significant figures and not five
Answers
thought it was 5 at first too. the 00 past the decimal at significant because it's expressing it is exactly to that point. sort of confusing.
say you measured a pencil with a ruler, and say it was 5" long roughly. you can only scientifically put down that the pencil is 5 inches not 5.0000 because your ruler doesn't go that many decimal places. when something is absolute is the only time you can add .0000000000000000000000 to it and it still be correct. an example of something that is absolute is like you have 10 fingers, 10 is absolute because it's exact 10.0000000000000000=10 fingers it's not any more and not any less.
Those two zeros are included after the decimal so they aqre significant. The rule is all final zeros after the decimal are significant
Since there is a decimal point present, start with the leftmost nonzero didgit. Count that digit and every other digit to the right of it.
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Answers
GPE = mgh
where:
m = mass of object
g = gravitational constant, 9.81 m/s^2
h = height
For a given gpe of 20 J, the height can be calculated as follows:
*Remember to be consistent with units. Since Joule is derived from SI units, make sure to use SI units for the other variables
GPE = 20 J = 1 (9.81) (h)
h = 2.04 meters
Answers
Answer:
Vf=60m/s
Vi=0 because it starts from rest
t=4.4s
a=?
a=Vf-Vi/t
a=60-0/4.4
a=60/4.4
a=13.63m/s^2
Answer:
13.636364 m/s2
Answers
take 56.9/1.137 = 50.043 mi/hr
take 189/211 = 0.896
24.8/2 = 12.4 m
12.4/82.3 = 0.15s
a lot of points, and your plea for help sounds so desperate, that I think
I ought to jump in here and relieve some of your pain.
These aren't difficult problems. The bummer is that whoever wrote them
got so interested in his dinosaur stories that he kind of hid the actual Math
and Physics under all kinds of stuff that doesn't matter.
1). Speed = (distance covered) / (time to cover the distance)
= (56.9 miles) / (68.2 minutes)
= (56.9 / 68.2) miles/minute
= 0.834 mile per minute.
BUT ... the question wants to know the speed in 'mph' ... miles per hour.
Well ... there are 60 minutes in an hour. If 0.834 mile in covered in 1 minute,
then 60 times as much would be covered in 1 hour.
(0.834 mile/minute) x (60 minute/hour) = 50.06 mile/hour
Rounded to no decimal places = 50 mph
2). Use the same formula:
Speed = (distance covered) / (time to cover the distance)
= (189 meters) / (211 seconds)
= (189 / 211) meters/seconds
= 0.8957 meters/second
Round to 3 decimal places: 0.896 m/s
3). The attacker jumped from 24.8 meters away.
He already covered half of the distance.
How far away is he now ? 1/2 of 24.8 m = 12.4 m .
He still has 12.4 meters left to go.
He's moving at 82.3 meters per second.
When will he arrive here ?
Time = (distance) / (speed)
= (12.4 meters) / (82.3 m/s)
= (12.4 / 82.3) seconds
= 0.1506 second
Two decimal places: 0.15 second
4). Distance = (speed) x (time)
= ( 237 km/hr) x (16.8 seconds) .
Do you see the problem here ? We have the distance covered in an hour,
but we need to know how much distance is covered in only 16.8 seconds.
We really need to work out the speed in (meters per second).
OK. 237 km = 237,000 meters, so the speed is 237,000 meters/hour.
1 hour is 3,600 seconds.
So the speed is only one 3600th of 237,000 meters in 1 second.
(237,000 meters/hour) x (1 hour / 3600 seconds) = 65.8333 m/s
Distance = (speed) x (time)
= (65.8333 meter/second) x (16.8 seconds)
= (65.8333 x 16.8) meters
= 1106 meters.
5). This is a nasty trick question. The whole story is irrelevant,
and we don't even care how far Vinny dropped.
Anything that drops on Earth falls with the acceleration of gravity.
It doesn't matter how big or heavy or small or light it is.
Everything falls with the acceleration of gravity on Earth ... about 9.8 m/s² .
Answers
Q = m . v
Qtruck = 2680 . 15
Qt = 40.200 kg . m/s
Then,
Qcar = Qt
m . V = 40 . 200
1340 . V = 40.200
V = 40 . 200 / 1340
V = 30 m / s
Answers
Answer:
As a form of energy, heat has the unit joule (J). The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second.
heat is a form of energy therefore the unit of heat is the same as that of energy has the CGS unit of heat is erg and its SI unit is Joule
relationship between Joule and erg is --
other unit of heat are calories kilocolries
Answers
Answer:
No
Explanation:
The statement is implying that if you do a certain amount of work, you're entitled to do a certain amount of work. Sometimes, work doesn't entitle you a reward.
Final answer:
Taking the stairs does not justify eating a whole 'Chocolate Fondue for Two' from a health perspective. The calories burned climbing stairs would not offset the number of calories consumed from the chocolate.
Explanation:
This question appears to be related more towards the subject of Health and nutritional decisions. Eating an entire 'Chocolate Fondue for Two' by yourself due to taking the stairs instead of the elevator does not necessarily justify the act from either a health or dietary perspective. While taking the stairs can increase your physical activity and burn some calories, the amount burned would not be significant enough to counterbalance the high calorie intake from consuming 1lb of dark chocolate. An average individual may burn around 10 calories for every minute they spend climbing stairs, which would not make up for the roughly 2,200 calories present in a pound of dark chocolate.
Learn more about Calorie Intake and Expenditure here:
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