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3 years ago

Which is a unit to measure air pressure?

Physics

2 answers:

nata0808 [166]3 years ago

8 0

Answer:

c) cubic centimetre is it's answer..

Flura [38]3 years ago

3 0

Answer: (cubic centimetre) in barometer

PSI

pascals

Newtons per sq meter

Bars

mm hg

inches of water

Atmospheres

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Gravitational acceleration for the bodies falling freely is

STatiana [176]

Answer:

g= 9.81m/s..................

3 0

3 years ago

Sound waves rely on matter to transmit their energy. They cannot ravel in a vacuum. True or false

UNO [17]

Answer:

false

Explanation:

8 0

3 years ago

Read 2 more answers

A low C (f = 65Hz) is sounded on a piano. If the length of the piano wire is 2.0 m and its mass density is 5.0 g/m2, determine t

Pie

Answer:

338N

Explanation:

Use the formula $f=\frac{\sqrt{\frac{T}{\frac{M}{L}} } }{2L}$

f is the frequency, T the string tension, M the mass, and L the length

convert units to seconds, kilograms, meters

$65Hz\ =\ \frac{\sqrt{\frac{T}{\frac{0.005kg}{m}}}}{2\cdot2m}$

now solve for T

sqrt(T/.005) = 65*4 = 260

T = 338N

8 0

3 years ago

In the visible spectra of stars, absorption lines of hydrogen are produced when atoms are excited from n = 2 to higher levels (t

grigory [225]

Answer:

3. relatively high temperature, about 10,000 K, so that significant numbers of electrons are excited from the ground state, n = 1, to the first excited state, n = 2, but not too many of them have been ejected completely from the atoms

Explanation:

If hydrogen absorption lines are very strong in the visible spectrum of a particular star that means the population of electron in n = 2 is very high so on being exited they absorb radiation in Balmer series and give rise to absorption spectrum. The average temperature required to excite electron in hydrogen atom from n=1 to n = 2 is 10000K .

4 0

3 years ago

A hot-air balloon of diameter 12 mm rises vertically at a constant speed of 15 m/sm/s. A passenger accidentally drops his camera

jeka94

To solve this problem we will apply the linear motion kinematic equations. With the information provided we will calculate the time it takes for the object to fall. From that time, considering that the ascent rate is constant, we will take the reference distance and calculate the distance traveled while the object hit the ground, that is,

$h = v_0 t -\frac{1}{2} gt^2$