3 years ago

7. If a hot spoon is placed in a glass of cold

Physics

1 answer:

pychu [463]3 years ago

5 0

Answer:

Explanation:

Spoon decrease, water increase

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Only main sequence stars have a well-defined relationship between spectral type and luminosity.

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Low-mass stars have much longer lifetimes than high-mass stars.

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1 year ago

The odometer of a car changes from 1048 km to 1096 km in 40

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20m/s

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it covers 20 metres in a second

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A house is losing heat at a rate of 1600 kJ/h per °C temperature difference between the indoor and the outdoor temperatures. Exp

Setler [38]

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1600 kJ/h per K, 888.88 kJ/h per °F and 888.88kJ/h per R

Explanation:

We make use of relations between temperature scales with respect to degrees celsius:

$1 K= 1^{\circ}C+273\\1^{\circ}F= (1^{\circ}C*1.8)+32\\1 R= (1^{\circ}C*1.8)+491.67$

This means that a change in one degree celsius is equivalent to a change of one kelvin, while for a degree farenheit and rankine this is equivalent to a change of 1.8 on both scales.

So:

$\frac{Q}{\Delta T(K)}=\frac{Q}{\Delta T(^\circ C)}=1600 \frac{kJ}{h} per K\\\frac{Q}{\Delta T(^\circ F)}=\frac{Q}{\Delta T(^\circ C*1.8)}=888.88 \frac{kJ}{h} per ^\circ F\\\frac{Q}{\Delta T(R)}=\frac{Q}{\Delta T(^\circ C*1.8)}=888.88 \frac{kJ}{h} per R$

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3 years ago

A 2.5 kg table can hold kg of weight. what is its structural efficiency?

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It's (whatever number comes after 'hold') divided by 2.5 .

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3 years ago