2 years ago

How much does it cost to leave a porch light on all night?

1 answer:

6 0

Cost = (0.001) x (the wattage of the light) x (the number of hours it's left on) x (the cost of each kilowatt-hour of electrical energy where you live).

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Which of the following statements about globular clusters is true? All stars in the cluster have approximately the same mass. Al

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Most stars in the cluster are yellow or reddish in color. Most

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1 year ago

Ice of mass 5 g at 0 °C melts to water at 0 °C.

amid [387]

Answer:

Q=1670J

Explanation:

Mass of ice: m=5g=0.005kg

Latent heat: lambda=3.34×10⁵J/kg

Heat received by ice: Q=m×lambda

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3 years ago

What is the change in velocity of a 22-kg object that experiences a force of 15 N for

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Answer:

Force = mass × acceleration

Acceleration:

${ \tt{15 = (22 \times a)}} \\ { \tt{a = \frac{15}{22} \: {ms}^{ - 2} }}$

From first Newton's equation of motion:

${ \bf{v = u + at}}$

Change = v - u:

${ \tt{v - u = (a \times t)}} \\ { \tt{v - u = ( \frac{15}{22} \times 1.2) }} \\ { \tt{v - u = 0.82 \: {ms}^{ - 2} }}$

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3 years ago

How does a planet’s size affect the length of a rotation of that planet

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There doesn't seem to be any direct connection.

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3 years ago

What mass has a rest energy of 100J?

alexandr1967 [171]

Answer:

option a is correct

Explanation:

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2 years ago