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3 years ago

Explain why saucepans are much more common with plastic handles than metal handles.

Physics

2 answers:

Kaylis [27]3 years ago

7 0

Answer:

i suppose that they plastic handles because it is more economic and since the pan is metal they have the handle as plastic so you wont burn yourself

Explanation:

horrorfan [7]3 years ago

3 0

Because it’s cheaper and efficient

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A ball is thrown vertically upward with a velocity of 115m/s. Show work

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3 years ago

Einstein's equation E=mc2 helps scientists understand the sun's energy because the equation..

scZoUnD [109]

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3 years ago

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A student sits in a chair that can spin without friction. The student has her hands outstretched and starts rotating at 1.9 rev/

Airida [17]

Answer:

the resulting angular speed after she pulls her hand inwards in (rad/s) is 27.02 rad/s

Explanation:

Given that :

the initial angular speed $\omega_1 = 1.9 \ \ rev/s$

Initial rotational inertia $I_1 = 12.00 \ \ kg.m^2$

Final angular speed $\omega_2 = ???$

Final rotational inertia $I_2 = 5.3 \ \ kg.m^2$

According to conservation of momentum :

Initial momentum = final momentum

$I_1 \omega_1 = I_2 \omega_2$

$\omega_2 = \frac{I_1 \omega_1}{I_2}$

$\omega_2 = \frac{12.00*1.9}{5.3}$

$\omega_2 = 4,3$ $rev/s$

To rad/s ; we have:

$1 \ rev/s = 2 \pi \ \ rad/s$

$\omega_2 = 4.3 * 2 \pi \ \ rad/s$

$\omega_2 = 27.02 \ \ rad/s$

Therefore the resulting angular speed after she pulls her hand inwards in (rad/s) = 27.02 rad/s

8 0

3 years ago

The temperature at the surface of the Sun is approximately 5,300 K, and the temperature at the surface of the Earth is approxima

N76 [4]

Answer:

The entropy change of the Universe that occurs is 19.346 J/K

Explanation:

Given;

temperature of the sun, $T_s$ = 5,300 K

temperature of the Earth, $T_E$ = 293 K

radiation energy transferred by the sun to the earth, E = 6000 J

The sun loses Q of heat and therefore decreases its entropy by the amount

$\delta S_{sun} = \frac{-Q}{T_s}$

The earth gains Q of heat and therefore increases its entropy by the amount

$\delta S_{Earth} = \frac{-Q}{T_E}$

The total entropy change is:

$\delta S_{Earth} + \delta S_{sun} = \frac{Q}{T_E} -\frac{Q}{T_S} \\\\ = Q(\frac{1}{T_E} -\frac{1}{T_S} )\\\\= 6000(\frac{1}{293} -\frac{1}{5300} )\\\\=6000(0.0032243)\\\\= 19.346 \ J/K$

Therefore, the entropy change of the Universe that occurs is 19.346 J/K

4 0

2 years ago

Kimonoski takes a 9-minute shower every day. The shower uses about 1.8 gal per minute of water. He also uses 23 gallons of hot w

ioda

Answer:

$Q_{week} = 458884.6\, BTU$

Explanation:

The weekly water consumption of Kimonoski is:

$m_{bath,week} = (62.4\,\frac{lbm}{ft^{3}})\cdot (1.8\,\frac{gal}{min} )\cdot (\frac{0.134\,ft^{3}}{1\,gal} )\cdot (\frac{1\,min}{60\,s} )\cdot (9\,min)\cdot (\frac{60\,s}{1\,min} )\cdot (7\,\frac{days}{week} )\cdot (1\,week)$