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3 years ago

Define density in thermodynamics

Physics

1 answer:

oksano4ka [1.4K]3 years ago

5 0

Answer:

total mass (m) of that substance divided by the total volume (V) occupied by that substances

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You are on the roof of the physics building, 46.0 above the ground . Your physics professor, who is 1.80 tall, is walking alongs

Fudgin [204]

Answer:

3.6m

Explanation:

if you are at a building that is 46m above the ground, and the professor is 1.80m, the egg must fall:

46m - 1.80m = 44.2m

the egg must fall for 44.2m to land on the head of the professor.

Now, how many time this takes?

we have to use the following free fall equation:

$h=v_{0}t+\frac{1}{2}gt^2$

where $h$ is the height, $v_{0}$ is the initial velocity, in this case $v_{0}=0$ . $g$ is the acceleration of gravity: $g=9.81m/s$ and $t$ is time, thus:

$h=\frac{1}{2}gt^2$

clearing for time:

$2h=gt^2\\\frac{2h}{g}=t^2\\\sqrt{\frac{2h}{g}} =t$

we know that the egg has to fall for 44.2m, so $h=44.2$ , and $g=9.81m/s$ , so we the time is:

$t=\sqrt{\frac{2(44.2m)}{9.8m/s^2} }=\sqrt{\frac{88.4m}{9.81m/s^2} } =\sqrt{9.011s^2}= 3.002s$

Finally, if the professor has a speed of $v=1.2m/s$ , it has to be at a distance:

$d=vt$

and t=3.002s:

$d=(1.2m/s)(3.002s)=3.6m$

so the answer is the professor has to be 3.6m far from the building when you release the egg

7 0

3 years ago

An ice skater has a moment of inertia of 2.5 kg.m2 when her arms are extended and a moment of inertia of 1.2 kg.m2 when her arms

Damm [24]

Answer:

$\omega=4.7916\ rad.s^{-1}$

Explanation:

Given:

moment of inertia of the skater with extended arms, $I'=2.5\ kg.m^2$

moment of inertia of the the skater with pulled-in arms, $I=1.2\ kg.m^2$

angular velocity of the skater with extended arms, $\omega'=2.3\ rad.s^{-1}$

<u>Using the law of conservation of angular momentum:</u>

$I'.\omega'=I.\omega$

$2.5\times 2.3=1.2\times \omega$

$\omega=4.7916\ rad.s^{-1}$

6 0

3 years ago

N which device is chemical energy transformed into electrical energy?

densk [106]

The answer is batteries

7 0

3 years ago

Read 2 more answers

which describes the attraction or repulsion caused by magnets? a. magnetic domain b. magnetic force c. magnetic field

viva [34]

B. Magnetic force-attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron. Electric forces exist among stationary electric charges; both electric and magnetic forces exist among moving electric charges. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.

5 0

3 years ago

What force pulls the moon towards the earth?

yawa3891 [41]

Gravity pulls the moon towards the earth.

3 0

3 years ago

Define density in thermodynamics​

Define density in thermodynamics