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3 years ago

7

What does one calorie measure?

1 answer:

umka2103 [35]3 years ago

5 0

Answer:

A

Explanation:

Calorie is a measure of thermal energy, or heat. So A is the only one that works, since, the rest look for mass or change in temperature.

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Please help ASAP! Will give brainliest! :)

77julia77 [94]

Answer:

composition :))

Explanation:

5 0

3 years ago

Read 2 more answers

A piano wire with mass 2.95 g and length 79.0 cm is stretched with a tension of 29.0 N . A wave with frequency 105 Hz and amplit

Romashka-Z-Leto [24]

The concept needed to solve this problem is average power dissipated by a wave on a string. This expression ca be defined as

$P = \frac{1}{2} \mu \omega^2 A^2 v$

Here,

$\mu$ = Linear mass density of the string

$\omega =$ Angular frequency of the wave on the string

A = Amplitude of the wave

v = Speed of the wave

At the same time each of this terms have its own definition, i.e,

$v = \sqrt{\frac{T}{\mu}} \rightarrow$ Here T is the Period

For the linear mass density we have that

$\mu = \frac{m}{l}$

And the angular frequency can be written as

$\omega = 2\pi f$

Replacing this terms and the first equation we have that

$P = \frac{1}{2} (\frac{m}{l})(2\pi f)^2 A^2(\sqrt{\frac{T}{\mu}})$

$P = \frac{1}{2} (\frac{m}{l})(2\pi f)^2 A^2 (\sqrt{\frac{T}{m/l}})$

$P = 2\pi^2 f^2A^2(\sqrt{T(m/l)})$

PART A ) Replacing our values here we have that

$P = 2\pi^2 (105)^2(1.8*10^{-3})^2(\sqrt{(29.0)(2.95*10^{-3}/0.79)})$

$P = 0.2320W$

PART B) The new amplitude A' that is half ot the wavelength of the wave is

$A' = \frac{1.8*10^{-3}}{2}$

$A' = 0.9*10^{-3}$

Replacing at the equation of power we have that

$P = 2\pi^2 (105)^2(0.9*10^{-3})^2(\sqrt{(29.0)(2.95*10^{-3}/0.79)})$

$P = 0.058W$

8 0

3 years ago

Two clear but non-mixing liquids each of depth 15 cm are placed together in a glass container. The liquids have refractive indic

vladimir1956 [14]

Answer:

The apparent depth d = 19.8495 cm

Explanation:

The equation for apparent depth can be expressed as:

$d = \dfrac{d_1} {\mu_1}+\dfrac {d_2}{\mu_2}$

here;

$d_1 = d_2 = 15 \ cm$

$\mu_1$ = refractive index in the first liquid = 1.75

$\mu_2$ = refractive index in the second liqquid= 1.33

∴

$d = \dfrac{15}{1.75}+\dfrac{15}{1.33}$

$d = 15( \dfrac{1}{1.75}+\dfrac{1}{1.33})$

$d = 15( 0.5714 +0.7519)$

d = 15(1.3233 ) cm

d = 19.8495 cm

6 0

3 years ago

A car whose initial speed is 30 m/s slows uniformly to 10 m/s in 5 seconds. Determine the acceleration of the car. Sketch a gra

Anton [14]

Initial velocity=u=30m/s
Final velocity=v=10m/s
Time=5s

$\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}$

$\\ \sf\longmapsto Acceleration=\dfrac{10-30}{5}$

$\\ \sf\longmapsto Acceleration=\dfrac{-20}{5}$

$\\ \sf\longmapsto Acceleration=-4m/s^2$

Now

For the second question

Time=3s

Using 2nd equation of motion

$\\ \sf\longmapsto s=ut+\dfrac{1}{2}at^2$

$\\ \sf\longmapsto s=30(3)+\dfrac{1}{2}(-4)(3)^2$

$\\ \sf\longmapsto s=90-2(9)$

$\\ \sf\longmapsto s=90-18$

$\\ \sf\longmapsto s=72m$

5 0

3 years ago

How do scientists believe the universe formed?

Arte-miy333 [17]

Answer:

The Big Bang was the moment that the universe began, that as a tiny dense and the exploded!!!!!!! BOMBBBBBBBBBBBBBBB

Explanation:

3 0

3 years ago