A heat pump absorbs heat from the cold outdoors at 3 C and supplies heat to a
house at 20 C at a rate of 30,000 kJ/h. If the power consumed by the heat pump
<span>is 3 kW, find the coefficient of performance of the heat pump.</span>
Answer:
<em><u>The</u></em><em><u> </u></em><em>answer</em><em> </em><em>Is</em><em> </em><em>B.</em><em> </em>
Explanation:
<em><u>The</u></em><em><u> </u></em><em><u>cats</u></em><em><u> </u></em><em><u>acceleration</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>decreased</u></em>
<em><u>by</u></em><em><u> </u></em><em><u>air</u></em><em><u> </u></em><em><u>resistance</u></em><em><u>.</u></em><em><u> </u></em>
<em><u>hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>helps</u></em><em><u> </u></em><em><u>you</u></em><em><u>!</u></em><em><u> </u></em>
<em><u>follow</u></em><em><u> </u></em><em><u>me</u></em><em><u> </u></em><em><u>for</u></em><em><u> </u></em><em><u>more</u></em>
<em><u>don't</u></em><em><u> </u></em><em><u>worry</u></em><em><u> </u></em><em><u>I'll</u></em><em><u> </u></em><em><u>try</u></em><em><u> </u></em><em><u>my</u></em><em><u> </u></em><em><u>best</u></em>
The two flaws in
her experiment’s design are
<span>- She introduced at least one confounding variable.</span>
<span>- She tried to test multiple hypotheses at a time</span>
In the above mentioned experiment she had to have four samples to prove
four hypotheses, each one separately and not to mix two hypotheses in an alone
sample, that what it brings as consequence is the confusion.
Answer:
<em>The athlete will rise 1.10 meters off the ground</em>
Explanation:
<u>Vertical Motion</u>
If an object is launched vertically upwards at an initial speed vo, then it will reach a maximum height given by

The athlete can exert a net force upwards equal to twice his weight. It makes him accelerate upwards at

The speed at the end of his push can be computed by

Replacing the value of a obtained above:

where y is the length of this crouch


This is the initial speed of this vertical launch, thus


First, we write the SI prefixed. The SI unit for distance is meters.
Kilo = 10³
Mega = 10⁶
Giga = 10⁹
Terra = 10¹²
Because our value has ten to the power of 11, we will use the closest and lowest power prefix, which is giga.
1.5 x 10¹¹ / 10⁹
= 1.5 x 10² Gm or 150 Gm
Writing in kilometers, we simply repeat the procedure except we divide by 10³ this time.
1.5 x 10¹¹ / 10³
= 1.5 x 10⁸ km