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2 years ago

At what temperature, in degrees Celsius, is the speed of sound in air 339 m/s?

Physics

1 answer:

coldgirl [10]2 years ago

3 0

Answer: the answer would be C.

Explanation: hope this helps sorry if I got it wrong.

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If a planet has the same mass as the earth, but has twice the radius, how does the surface gravity, g, compare to g on the surfa

shepuryov [24]

Answer:

The surface gravity g of the planet is 1/4 of the surface gravity on earth.

Explanation:

Surface gravity is given by the following formula:

$g=G\frac{m}{r^{2}}$

So the gravity of both the earth and the planet is written in terms of their own radius, so we get:

$g_{E}=G\frac{m}{r_{E}^{2}}$

$g_{P}=G\frac{m}{r_{P}^{2}}$

The problem tells us the radius of the planet is twice that of the radius on earth, so:

$r_{P}=2r_{E}$

If we substituted that into the gravity of the planet equation we would end up with the following formula:

$g_{P}=G\frac{m}{(2r_{E})^{2}}$

Which yields:

$g_{P}=G\frac{m}{4r_{E}^{2}}$

So we can now compare the two gravities:

$\frac{g_{P}}{g_{E}}=\frac{G\frac{m}{4r_{E}^{2}}}{G\frac{m}{r_{E}^{2}}}$

When simplifying the ratio we end up with:

$\frac{g_{P}}{g_{E}}=\frac{1}{4}$

So the gravity acceleration on the surface of the planet is 1/4 of that on the surface of Earth.

3 0

3 years ago

Force is a vector, while mass is a scalar. Why can we use mass as an indicator of the magnitude of the force vector?

adoni [48]

Answer:

Explanation:

Force = mass x acceleration

$\overrightarrow{F}=m\overrightarrow{a}$

Force is always vector and acceleration also vector but the mass is a saclar quanity.

here, the direction of force vector is same as the direction of acceleration vector but the magnitude of force depends on the magnitude of mass of the body.

Is mass is more, force is also more.

Thus, the mass is like an indicator of the magnitude of force.

8 0

3 years ago

The steps in the scientific process must be followed in order. True False

olya-2409 [2.1K]

Answer: True

Hope I helped :)

5 0

3 years ago

Read 2 more answers

A moonshiner makes the error of filling a glass jar to the brim and capping it tightly. The moonshine expands more than the glas

ohaa [14]

Answer:

ΔP = (640 N/cm^2)

Explanation:

Given:-

- The volume increase, ΔV/V0 = 4 ✕ 10^-3

- The Bulk Modulus, B = 1.6*10^9 N/m^2

Find:-

Calculate the force exerted by the moonshine per square centimeter

Solution:-

- The bulk modulus B of a material is dependent on change in pressure or Force per unit area and change in volume by the following relationship.

B = ΔP / [(ΔV/V)]

- Now rearrange the above relation and solve for ΔP or force per unit area.

ΔP = B* [(ΔV/V)]

- Plug in the values:

ΔP = (1.6*10^9)*(4 ✕ 10^-3)

ΔP = 6400000 N/m^2

- For unit conversion from N/m^2 to N/cm^2 we have:

ΔP = (6400000 N/m^2) cm^2 / (100)^2 m^2

ΔP = (640 N/cm^2)

7 0

3 years ago

Luigi jumps straight upwards 15.0m/s. How high is he when he is jumping at :<br>8.0 m/s upwards

tensa zangetsu [6.8K]

Given: Initial velocity $v_i= 15.0m/s$

Final Velocity $v_f=8.0 m/s$

To find : Height when jumpled 8.0 m/s upwards.

Solution: We already have values of initial velocity and final velocity.

We know, accereration due to gravity is given by $a= -9.8 m/s^2$ .

It's negative because when jump it's in opposite direction.

$We know formula, v_f ^2 = v_i ^2+2ah.$

Where h is the height when jumpled 8.0 m/s upwards.

Plugging values of $v_i, \ v_f \ and \ a \ in \ formula \ above.$

$(8.0)^2 = (15.0)^2 +2(-9.8)*h$

64= 225 -19.6h

Subtracting both sides by 225.

64-225= 225 -19.6h-225.

We get,

-161 = -19.6h

Dividing both sides by -19.6, we get

$\frac{-161 }{-19.6} =\frac{ -19.6h}{ -19.6}$

h= 8.2143

Rounding to nearest tenth, we get

h= 8.2 meter.

His height is 8.2 meter when he is jumping 8.0 m/s upwards.

8 0

3 years ago