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596277

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Posted: 13 years ago

#411

^ Sorry after looking at the data again, I believe my work force was greater than the pulley's work force.

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Swag Master From Doncaster

@DesiGirl_

Inactive

+ 3

Posted: 13 years ago

#412

How do you find the domain of a function?

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komal

@scarlet.moon

Sparkler

+ 4

Posted: 13 years ago

#413

Originally posted by: Sweet_Shivani
How do you find the domain of a function?

Domain is the values of the x in the function such that it turns out to be a real number!

For example,

f(x)=(x+2)/(x-3)

Domain of this function is all real number except 3 because 3 will make the denominator zero hence not a real number. Other way to write the domain of this fuction is (-infinity,3)U(3, infinity)

Edited by -Komal - 13 years ago

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596277

Suspended

Posted: 13 years ago

#414

^ Thanks so much, did B and I got 21 degrees Celsius. And for C, I put for temperatures more than 0 degrees, water is better because it can take in heat without changing its temperature as much as methanol does. Could you see both my labs on pg. 55.?

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596277

Suspended

Posted: 13 years ago

#415

Sorry yeah you're right that was number 3, just noticed. Oh sorry, that 13.15 doesn't exist, I multiplies 1500 by 114 to get 171000. Power of kettle is 1500 watts. And yup you're right about the rest, and 1min and 54 minutes is 114 seconds.

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596277

Suspended

Posted: 13 years ago

#416

For 1, this is what I tried doing, not sure if right. Ee = Pt

= 1500*114

= 1.7*10^5 J

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akhl

@akhl

Dazzler

Posted: 13 years ago

#417

Originally posted by: -Ayeshaa-
For 1, this is what I tried doing, not sure if right. Ee = Pt

= 1500*114

= 1.7*10^5 J

Correct. The value you calculated in #1 is Ein
You solved #2 correctly in previous post. That is the value of Euseful.
For #3, use the formula:

(Euseful/Ein) * 100 %

#4. The rest of energy goes into surroundings, such as surrounding air, the wire through which the current flows and the body of the kettle.

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596277

Suspended

Posted: 13 years ago

#418

^ thanks so much, last lab left, one on pulleys, previous page I think.

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akhl

@akhl

Dazzler

Posted: 13 years ago

#419

For each pulley system, you must have calculated load and effort force. So u can find mechanical advantage.

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596277

Suspended

Posted: 13 years ago

#420

^ thanks and yup have finished the lab atlast, thank you =) But do you know the hidden shortcut to determine M.A for a pulley system without calculating?

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