+0

0
311
14
+1828

xvxvxv  Aug 29, 2014

#12
+330
+10

. . . what about 6 , 7 and 8 . . .

Yes, they are correct. I double checked them.

~~D~~

DavidQD  Aug 31, 2014
Sort:

#1
+26402
+5

Questions 9 through 21 are correct.

Several of the other images are too small for my jaded eyes to make out!

Alan  Aug 29, 2014
#2
+1828
0

xvxvxv  Aug 30, 2014
#3
+1828
0

are the pictures still unclear

xvxvxv  Aug 30, 2014
#4
+91451
+5

I am sorry 315, I have not had a chance to look at them and I don't know how many I could answer anyway.

Alan may have missed it and David has not been about for a while.

Chris may have a go at some when he is back on.

Anyway that is all I can do for you at the moment. sorry.

Melody  Aug 30, 2014
#5
+1828
0

Okay melody thank you and I will wait

xvxvxv  Aug 30, 2014
#6
+4471
+5

1.

AzizHusain  Aug 30, 2014
#7
+4471
+5

2. Correct.

AzizHusain  Aug 30, 2014
#8
+4471
+5

3. Correct.

4. Correct.

AzizHusain  Aug 30, 2014
#9
+330
+5

Q-1) The answer is (A). Remember to subtract the length (1cm from the top and 1 cm from the bottom) already included in the other measurements.

Q-2 through Q-5 ) Answers are correct.

For Q-23 . . . . .

Your answer, (B), is (probably) correct. If it didn’t say “always” and/or have (D) “Any value” as an alternative, then I might be more certain.

This is an ambiguous question. (These are often found on physics tests).

For most equations friction work is (usually) signed as negative. Applied forces, are usually positive.

Technically, friction opposes motion and, hence, does negative work. However, friction is not a vector, so the negative sign does not tell us that it's moving backward.

Friction removes energy from the system. That is why it is (usually) signed as negative. To overcome this, energy needs to be (continuously) added to the system.

Nota bene: Another consideration is friction can be (0) zero. If this is the case, then it is neither positive nor negative. This really is an ambiguous question

~~D~~

P.S. Now, that I have reread the question, it is clear it refers to the previous question (Q-20). Your answer, (B), is correct.

It does help to read the whole question.

DavidQD  Aug 31, 2014
#10
+1828
0

Thanj you AzizHusain  and DavidQD ...

xvxvxv  Aug 31, 2014
#11
+1828
0

but what about 6 , 7 and 8

are there correct

xvxvxv  Aug 31, 2014
#12
+330
+10

. . . what about 6 , 7 and 8 . . .

Yes, they are correct. I double checked them.

~~D~~

DavidQD  Aug 31, 2014
#13
+1828
0

Now its very clear .. thank you david

xvxvxv  Aug 31, 2014
#14
+91451
+5

Thank you Alan, Aziz and David :)

Melody  Aug 31, 2014

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