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timurjin [86]
3 years ago
8

Which physical properties can be used to identify an unknown substance?

Physics
1 answer:
Natalija [7]3 years ago
4 0
Density and boilind point
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The percent by which the fundamental frequency changed if the tension is increased by 30 percent is ? a)-20.04% b)-40.12% c)-30%
nika2105 [10]

Answer:

Percentage increase in the fundamental frequency is

d)-14.02%

Explanation:

As we know that fundamental frequency of the wave in string is given as

f_o = \frac{1}{2L}\sqrt{\frac{T}{\mu}}

now it is given that tension is increased by 30%

so here we will have

T' = T(1 + 0.30)

T' = 1.30T

now new value of fundamental frequency is given as

f_o' = \frac{1}{2L}\sqrt{\frac{1.30T}{\mu}}

now we have

f_o' = \sqrt{1.3}f_o

so here percentage change in the fundamental frequency is given as

change = \frac{f_o' - f_o}{f_o} \times 100

% change = 14.02%

3 0
3 years ago
The rod is made of A-36 steel and has a diameter of 0.24 in . If the rod is 4 ft long when the springs are compressed 0.7 in . a
Keith_Richards [23]

Answer:

69

Explanation:

69

8 0
4 years ago
What unit do we use for pressure
-Dominant- [34]

Answer:

Pascal

Explanation:

5 0
3 years ago
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True or False? In the quark era, it was so hot that matter and
Eva8 [605]

Answer:

False

Explanation:

Great educated guess energy and matter is different

8 0
4 years ago
Jim pushes hard on a rock that weighs 500 pounds. He pushes with a force of 50 pounds, but the rock doesn't move. How much work
seraphim [82]

Answer:

Zero work

Explanation:

Recall that work done on  an object is defined as the product of the net force applied to an object times the distance it travels in the same direction as the force.

Since in this case Jim used a given force to push a rock, but it didn't move, then he did zero work (because the distance moved is zero).

6 0
3 years ago
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