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3 years ago

How many calories are equal to one BTU? (One calorie = 4.186 J, one BTU = 1 054 J.)

Physics

2 answers:

natima [27]3 years ago

5 0

Answer:

Explanation:

Given

1 calorie is equals to 4.186 J

and 1 BTU equals to 1054 J

using unitary method

$1\ calorie \equiv 4.186 J$

$1\ calorie \equiv 4.186 \times 1 J$

and $1\ J \equiv \frac{1}{1054} BTU$

thus $1\ calorie \equiv 4.186 \times \frac{1}{1054} BTU$

$1\ calorie\ \equiv 0.00397 BTU$

$1\ calorie\ \equiv 397\time 10^{-5} BTU$

or $BTU=251.88\approx 252 cal$

expeople1 [14]3 years ago

4 0

Answer:

option (c)

Explanation:

According to the question

1 BTU = 1054 J

4.186 J = 1 cal

So, 1 J = 1/4.186 cal

So, 1054 J = 1054 / 4.186 cal

= 251.8 cal

By rounding off, it is 252 cal

So, 1 BTU = 252 cal

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Wewaii [24]

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3 years ago

If the box weighs 40 newtons and is lifted a distance of 2 meters, how much work is done on the box?

Zarrin [17]

Answer:

The work done on the box is 80 J.

Explanation:

Given that,

Weight of box = 40 N

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Put the value into the formula

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3 years ago

13) A mass attached to the free end of a spring executes simple harmonic motion according to the equation y = (0.50 m) sin (18π

Kitty [74]

Hi there!

The period is given by:

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y(t) = Asin(ωt + φ)

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ω = angular frequency (rad/sec)

t = time (sec)

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In this instance, the angular frequency is given as 18π.

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4 0

3 years ago

The first law of thermodynamics states that ΔE= Q− W . Is this also a statement of the principle of conservation of energy? Yes,

ozzi

Answer:

Yes, the heat that flows into the system is used to change the internal energy of the gas and becomes work done by the piston.

Explanation:

First law of thermodynamics known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.

The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system. In equation form, the first law of thermodynamics.

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ΔE= Q− W

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Rewriting the equation

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Show that the heat flowing l into the system is transferred to the internal energy of the system and the work done by the piston

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3 years ago