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pychu [463]
2 years ago
11

I would appreciate some help.

Physics
1 answer:
motikmotik2 years ago
4 0
You oughtta be able to do this one.

The "efficiency" is just the portion of the input work that
comes out in a useful form.

If the efficiency is 70%, that tells you that however much work
you put INto the machine, the machine will do 70% of that much
work for you at the output side.

Put 20,000 J in ... out comes (0.70) x (20,000 J)  =  14,000 J .

What happens to the other 30% of the work you put into it ?
It turns into HEAT.  That's why machines always have to be
cooled somehow while they're running.  
 
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Which energy is cuased by an objects vibration
amm1812

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Calculate the displacement of a motorcycle that accelerates forward from rest to 7.0 m/s in 3.5 s.
Harrizon [31]

Answer:

12.25 meters

Explanation:

s=1/2(v+u)t

s= displacement

v= final velocity

u= initial velocity

t= time

7m/s+0m/s divide by 2= 3.5 m/s velocity  Times 3.5 seconds=  12.25 meters

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2 years ago
A uniform beam XY is 100 cm long and weighs 4.0N.The beam rests on a pivot 60 cm from end X. A load of 8.0 N hangs from the beam
Alex777 [14]

Answer:

<h2>The magnitude of force F is 18N</h2>

Explanation:

The magnitude of the force in the set up can be solved for using the principle of moment. According to the principle, the sum of clockwise moment  is equal to the sum of anticlockwise moments.

Moment = Force * perpendicular distance

Clockwise moments;

The force that acts clockwise is the unknown Force F and 4N force. If the  beam rests on a pivot 60 cm from end X and a Force F acts on the beam 80 cm from end X, the perpendicular distance of the force F from the pivot is 80-60 = 20cm and the perpendicular distance of the 4N force from the pivot is 60-50 = 10cm

Moment of force F about the pivot = F * 20

Moment of 4N force about the pivot = 4*10 = 40Nm

Sum of clockwise moment = 40+20F...(1)

Anticlockwise moment;

The  8N will act anticlockwisely about the pivot.

The distance between the 8N force and the pivot is 60-10 = 50cm

Moment of the 8N force = 8*50

=400Nm...(1)

Equating 1 and 2 we have;

40+20F = 400

20F = 400-40

20F = 360

F = 18N

The magnitude of force F is 18N

6 0
3 years ago
How are NGC 1427A and U different? How are they the same?
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Which of the following measurement is most significant?
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Option C. The measurement with the most significant number is 6.600 cm.

<h3>What is significant number?</h3>

Significant numbers are numbers that have significance or meaning and give more precise details about the value of the entire numbers.

  • 66.000 cm ------> 2 significant numbers
  • 0.00066 cm -------> 2 significant numbers
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Thus, the measurement with the most significant number is 6.600 cm.

Learn more about significant numbers here: brainly.com/question/24491627

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8 0
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