The total rate of energy use in the United States is now such that each person has the equivalent of about ___ horsepower working continuously.98.3 QBtu/year
29 million people in the U.S.
Horsepower= 746 W

The above is the info you will need. This is what I have done so far, but it can NOT be right:
98.310^15Btu/year(1 year/365 days) = 0.26931510^15 Btu/day (0.26931510^15Btu/day)/291 million = (0.269310^15 Btu/day)/29110^6 ~0.0009254810910^5 Btu/day = 925,481.09Btu/day
925,481.09Btu/day(1day/24hour) = 38561.71 Btu/hour ~ 38561.7Btu/hour
1horsepower = 746 W
1 W = 3.412Btu/hr38561.7Btu/hr(1 W/3.412 Btu/hr) ~ 11301.3 W*(1 hp/746 W) = 15.149 hp

Answers

Answer 1

Answer:
The more I have worked on this, the stranger it has become.
First ... I didn't know what 'QBTU' means. But I see that you called it
' 10¹⁵ ' so I guess it's 'quadrillion'.
Next ... your given data says 29 million people in the US, and that's
ridiculous. Right now it's about 319 million. It was 290 million in 2002,
and I see that you used 291 million, so that looks like it was a typo.
No problem.

Now . . . I did it 3 or 4 times using that 3.412 BTU/hr = 1 watt . I did get
the significant figures of 152, but I kept getting either 152 HP or 0.152 HP.

At this point, I traced through your solution ... thank you very much for
posting it ... and I'm going to take your colossal load of points for saying
that I I did go through every step in detail, I agree 100% with everything
I see there, and I endorse every move you made.

So up to now, we both agree that we cannot see where 1.5 HP/person
comes from.

I looked back to the conversion factors, and I saw something that could
make the arithmetic less complex: 1 BTU = 1,055 Joules
Look what I can do with that:

   (98.3 x 10¹⁵ BTU/yr) x (1,055 joule/BTU) x
   (yr/365 day) x (day/86,400sec) x
   (HP/746 joule-sec) = 4.4082 x 10⁹ HP

then . . .

(4.4082 x 10⁹ HP) / (29.1 x 10⁷ people) = 15.15 HP/person

I'd say that your work, using the given data, has been vindicated by
an outside, independent consultant. It may not be a true statistic, but
your math is bullet-proof, and the data have been properly implemented.

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Which explains why conduction is unlikely when ice is placed on a freezer shelf? There is no direct contact. The ice is too cold. The shelf acts as an insulator. The ice and shelf are the same temperature.

Answers

Answer: The ice and shel are at the same temperature.

Explanation: Conduction happens when you have two objects at different temperatures touching each other, in this case, the temperature flows from the hot object to the cold one, until the equilibrium is reached (this means that both objects are at the same temperature). So, in order to conduction to happen, we need a difference in temperature and direct contact. So there are two options of the given that can be the answer: "There is no direct contact" In the sentence says that "the ice is placed on the freezer shelf", so we have direct contact between both objects. "The ice and shelf are at the same temperature" Here both objects are inside of the freezer, so we can expect that both of them are at the same temperature, hence, there is no conduction.

Answer:

the correct answer is d

Explanation:

A skateboarder skates down a ramp for 3 seconds. If his initial velocity was 0.8 m/s and · his final velocity was 7 m/s, what was his acceleration?

Answers

Answer:

The acceleration of the skateboarder is 2.067 m/s²

Explanation:

Given;

initial velocity of the skateboarder, u = 0.8 m/s

final velocity of the skateboarder, v = 7 m/s

time of motion, t = 3 s

The acceleration of the skateboarder is given as;

$a = (v-u)/(t)\n\na = (7-0.8)/(3)\n\na = 2.067 \ m/s^2$

Therefore, the acceleration of the skateboarder is 2.067 m/s²

Which one is having lesser ressistance. a 60w bulb or a 40w bulb?

Answers

Power dissipation = (voltage across the component)² / (resistance of the component)

Since the resistance is in the denominator of the fraction in this formula for the
quantity of power dissipated, you can see that when the supply voltage is constant,
the smaller resistance dissipates more power.

So the 60w bulb has lower resistance than the 40w bulb.

When used as an energy source in a nuclear power plant, uranium is burned in a similar way as one would burn wood or coal for energy. a. True
b. False

Answers

False because nuclear fission is used on uranium in nuclear power station and this reaction is continuous since a neutron hits a uranium atom and splits it. Then 2-3 neutrons are released which continues the cycle or hitting other uranium atoms. If this reaction isn't contained, it could get out of control and become a nuclear bomb. So it can't be burned like wood nor coal.
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A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.4-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.2 m/s. (a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?

Answers

Answer:

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3.32 m/s

Explanation:

$m_1$ = Mass of first cart = 2.9 kg

$m_2$ = Mass of second cart = 1.4 kg

$v_1$ = Velocity of first cart = 3.9 m/s

$v_2$ = Velocity of second cart = -1.2 m/s

Total momentum of the system

$p=m_1v_1+m_2v_2\n\Rightarrow p=2.9* 3.9+1.4* -1.2\n\Rightarrow p=9.63\ kg m/s$

The total momentum of the system is 9.63 kg m/s

Equating the same equation with $v_2=0$

$p=m_1v_1+m_2v_2\n\Rightarrow v_1=(P-m_2v_2)/(m_1)\n\Rightarrow v_1=(9.63-1.4* 0)/(2.9)\n\Rightarrow v_1=3.32\ m/s$

The velocity of the first cart when the second cart was still at rest is 3.32 m/s

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Answers

1). Work = (force) x (distance)

Work = (3,000 newtons) x (35 meters) = 105,000 newton-meters = 105,000 joules

2). Power = (work) / (time)

Power = (105,000 joules) / (90 seconds)
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Note:
That's no ordinary man.
1,166 watts is the same as roughly 1.6 horsepower.
Not too many people can sustain 1 horsepower or more for 90 seconds.

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