A particle's position is r = t^2 i - t j + (t+1)k. Find its acceleration at t=2.
Anonymous Quiz
9%
2i
42%
2i + k
45%
4i - j +k
4%
2i - j +k
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If f(x)+f(1/x)=f(x)f(1/x), f(3)=4, then f(5)=? (f is not constant)
Anonymous Quiz
8%
4
56%
7
26%
11
10%
Undefined
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A particle's position is r=(t^2)i + tj. At t=2s, what's its angular velocity about the origin?
Anonymous Quiz
12%
-0.2k rad/s
49%
-0.4k rad/s
32%
0.4k rad/s
7%
0.2k rad/s
Which reacts fastest with CH3I?
Anonymous Quiz
19%
(CH3)3CO- Na+
27%
(CH3)3COH
47%
(CH3)2CHO- Na+
6%
(CH3)2CHOH
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A body cools from 60°C to 50°C in 10 min. If room temp is 25°C, time to cool to 40°C is:
Anonymous Quiz
17%
10 min
47%
12 min
30%
15 min
6%
8 min
A body cools from 60°C to 50°C in 10 min. If room temp is 25°C, time to cool to 40°C is:
Anonymous Quiz
13%
10 min
56%
>10 min
29%
<10 min
1%
5 min
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