Search found 26 matches

by sdaswani
Sat Mar 16, 2019 4:02 pm
Forum: Post Questions About Exams and QBank
Topic: NS FL #5 Chem/Phys Q40
Replies: 2
Views: 105

Re: NS FL #5 Chem/Phys Q40

Thanks!!
by sdaswani
Thu Mar 14, 2019 7:50 am
Forum: Post Questions About Exams and QBank
Topic: NS FL #5, CARS 13
Replies: 1
Views: 70

NS FL #5, CARS 13

Hi --- doesn't the author tell us how the ill suited British white ties are still used among the upper class in India? I was confused why the correct answer says "nonetheless failed to adapt for generations." Doesn't this imply that the culture did not last? Would appreciate any clarification. Thank...
by sdaswani
Tue Mar 12, 2019 8:31 am
Forum: Post Questions About Exams and QBank
Topic: NS FL #5 Chem/Phys Q40
Replies: 2
Views: 105

NS FL #5 Chem/Phys Q40

why is the answer here evaporation and not condensation? From my understanding, if the latent heat is decreasing at the ocean (heat energy is given off to the environment), isn't this condensation? evaporation would imply the ocean absorbing (not releasing heat energy) and turning into water vapor. ...
by sdaswani
Mon Mar 11, 2019 8:46 am
Forum: Post Questions About Exams and QBank
Topic: NS FL # 5 Chem/Phys Q5
Replies: 1
Views: 103

NS FL # 5 Chem/Phys Q5

Hi. I'm thinking that failure to account for air resistance in this case, would overestimate the velocity of the pitch and hence, over estimate the efficiency of energy transfer from arm to baseball (to allow the ball to have that "increased/higher" velocity). why does the answer predict the efficie...
by sdaswani
Mon Mar 11, 2019 8:18 am
Forum: Post Questions About Exams and QBank
Topic: NS FL #5 Chemistry/Phys Q 2
Replies: 1
Views: 92

NS FL #5 Chemistry/Phys Q 2

Hi -- between B and C for this question, why is B a better choice? the velocity of the pitch decreases because of the reduced amount of energy transfer through the torso.. but doesn't that happen because of the uncoupling i.e., larger amounts of energy dissipated by the body during follow through? I...
by sdaswani
Sun Mar 03, 2019 2:53 pm
Forum: Post Questions About Exams and QBank
Topic: NS FL #4 Chem/Phys Q58
Replies: 5
Views: 244

Re: NS FL #4 Chem/Phys Q58

"In Bernoulli's the height actually goes down in the positive direction because of the way that formula is derived. Be sure to remember that larger y corresponds with greater depth." This is what I was missing! thanks so much!!
by sdaswani
Sun Mar 03, 2019 9:49 am
Forum: Post Questions About Exams and QBank
Topic: NS FL #4 Chem/Phys Q58
Replies: 5
Views: 244

Re: NS FL #4 Chem/Phys Q58

thanks for this clarification! Assuming up is +ve and down is -ve: In the first equation: - g(h2) = (1/2) (v2)^2 both g and h would be -ve; that is g = -10m/s and h2 = -5m. though the explanation says to use 5m (positive) while using a negative g. why is this? (In this calculation, the sign's ultima...
by sdaswani
Sun Mar 03, 2019 9:38 am
Forum: Post Questions About Exams and QBank
Topic: NS FL #4, Chemistry/Phys Q 43
Replies: 2
Views: 143

Re: NS FL #4, Chemistry/Phys Q 43

Thank you!!
by sdaswani
Sat Mar 02, 2019 7:49 pm
Forum: Post Questions About Exams and QBank
Topic: NS FL #4 Chem/Phys Q58
Replies: 5
Views: 244

NS FL #4 Chem/Phys Q58

Hi, I'm having trouble with the sign convention used in this Qs. 1. -gy2 = 1/2 v2^2 why do we use a negative g here? also, shouldn't y = 5m also be negative since it is 5m below the surface of the tank (the arbitrary baseline or 0m)? 2. d = vit + 1/2 gt2 again, why is 20m here used assigned a negati...
by sdaswani
Sat Mar 02, 2019 7:31 pm
Forum: Post Questions About Exams and QBank
Topic: NS FL #4, Chemistry/Phys Q 43
Replies: 2
Views: 143

NS FL #4, Chemistry/Phys Q 43

Hi! Just to make sure I understand this Qs correctly ---- i'm thinking of this as E at start of roller coaster = E at the loop; hence mgH = mg(h of loop = 2r) + KE at loop (0.5mv^2). Given the loop, I get that the acceleration there is centripetal a. However, why would we equate this centripetal a t...