What is the approximate relative humidity in the situation shown below?
top
tomparatur
10 degrees
dmerenco
o
laian
dry bulb
reading rci
dihoronco bolwoon wol and
dry-bulb reading cc)
olasan
ettetall
tes
18
29
20
lege
12: 00 am
the
41: 11: 39
2619
ster
watch
o
de
sale
be
cs
te
ga
55.
new
-65
44
62. 5651: 46.11.
leee
63
53
sille
64
08
65
go
150
51
dry bulb wel bulo
t= 29.8°ct = 20.9°c
66
et
re
152
hede
/>elles
9%
21%
p
entre
la
letter
1
lata
cmns

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.