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kykrilka [37]
4 years ago
9

!!!!!!!!!!!!!!!PLEASE HELP!!!!!!!!!!!!!!!!!!!!

Physics
1 answer:
marshall27 [118]4 years ago
6 0
Given:

An ideal gas expands at constant pressure:

P = 105 pascals
V1 = 1 m3
V2 = 4 m3

then, the gas is compressed to 1/3 of the pressure and volume 2.50 m3. 

Work at constant pressure:

W = PΔV

W = 105 pascals * (4 m3 - 1 m3)
W = 315 Joules

Work at constant volume is zero.


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3 years ago
What is the impulse of a 3 kg object that starts from rest and moves to 20 m/s?
IrinaK [193]

Answer:

The impulse on the object is 60Ns.

Explanation:

Impulse is defined as the product of the force applied on an object and the time at which it acts. It is also the change in the momentum of a body.

F = m a

F = m(\frac{v_{2}  - v_{1} }{t})

⇒     Ft = m(v_{2} - v_{1})

where: F is the dorce on the object, t is the time at which it acts, m is the mass of the object, v_{1} is its initialvelocity and v_{2} is the final velocity of the object.

Therefore,

impulse = Ft = m(v_{2} - v_{1})

From the question, m = 3kg, v_{1} = 0m/s and v_{2} = 20m/s.

So that,

Impulse = 3 (20 - 0)

             = 3(20)

             = 60Ns

The impulse on the object is 60Ns.

8 0
3 years ago
A shuttle bus slows down with an average acceleration of -2.4 m/s2. How long does it
olganol [36]

Answer:

\boxed {\boxed {\sf 3.75 \ seconds }}

Explanation:

Average acceleration is found by dividing the change in acceleration by the time.

a=\frac{ v_f-v_i}{t}

The shuttle bus has an acceleration of -2.4 meters per square second. It slows from 9.0 meters per second to rest, or 0 meters per second. Therefore:

a= -2.4 \ m/s^2 \\v_f= 0 \ m/s \\v_i= 9 \ m/s

Substitute the values into the formula.

-2.4 \ m/s^2=\frac{0 \ m/s - 9 \ m/s}{t }

Solve the numerator.

-2.4 \ m/s^2 = \frac{-9 \ m/s}{t}

We want to solve for t, the time. We have to isolate the variable. Let's cross multiply.

\frac{-2.4 \ m/s^2}{1} = \frac{-9 \ m/s}{t}

-9 \ m/s *1= -2.4 \ m/s^2 *t

-9 \ m/s=-2.4 m/s^2*t

t is being multiplied by -2.4. The inverse of multiplication is division, so divide both sides by -2.4

\frac{-9 \ m/s }{-2.4 \ m/s^2} =\frac{ -2.4 \ m/s^2*t}{-2.4 \ m/s^2}

\frac{-9 \ m/s }{-2.4 \ m/s^2} =t

3.75 \ s=t

It takes <u>3.75 seconds.</u>

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3 years ago
8. Before leaving the ground an airplane traveling with constant acceleration makes a run on the
Effectus [21]

Answer:

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<h3>B. Speed at which it leaves the ground</h3>
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What happens when an object is moved against gravity, such as rolling a toy car up a ramp?
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Answer:

it goes up until we help it to but the moment we stop support it gets affected by gravity and goes back

Explanation:

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