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3 years ago

Explain the relationship between the distance between the string and your elbow and the effort required to lift the mass.

Physics

2 answers:

MissTica3 years ago

5 0

Answer:

Sorry I I’m a little lost

Explanation:

aleksandr82 [10.1K]3 years ago

4 0

Answer:

hmm the relation ship would be bad 1 because its not cooperating because I would have to do allot of force to pick up the mass with a tiny string, what an idiot, 2nd the distance is far now that its not a good relationship

Explanation:

hope this helps old pal ( :

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On his fishing trip Justin rides in a boat 12 km south. The fish aren’t biting so they go 4 km west. They then follow a school o

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4 years ago

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The mechanical power output of an electric motor is 2.20 hp. The motor is connected to a 120 V source and is 89.0% efficient in

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Answer:

a) $i = 15.367\,A$ , b) $E = 25.226\,MJ$ , c) $C = 0.771\,USD$

Explanation:

a) Let assume that electric motor is single-phase and operates in DC-mode, so that mechanical power output is:

$\dot W = \eta \cdot i \cdot V$

The current delivered to the motor is:

$i = \frac{\dot W}{\eta \cdot V}$

$i = \frac{(2.20\,hp)\cdot \left(\frac{0.746\,kW}{1\,hp} \right)\cdot \left(\frac{1000\,W}{1\,kW} \right)}{(0.89)\cdot (120\,V)}$

$i = 15.367\,A$

b) The power delivered to the motor is:

$\dot W = i\cdot V$

$\dot W = (15.367\,A)\cdot (120\,V)$

$\dot W = 1844.04\,W$

The energy delivered to the motor during 3.80 hours of operation is:

$E = (1844.04\,W)\cdot (3.80\,h)\cdot \left(\frac{3600\,s}{1\,h}\right)\cdot \left(\frac{1\,MJ}{1000000\,J}\right)$

$E = 25.226\,MJ$

c) The cost to run the motor is:

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3 years ago

Manufacturers sometimes use science to make foods more nutritious. Food manufacturers can make reduced fat potato chips, besides

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4 years ago

Read 2 more answers

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NNADVOKAT [17]

I love science! if you need any more help let me know i cant guarantee i can help but i will try!

The correct answer is "Some substances must be dissolved in water before they can be used".

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3 years ago

According to Newtons third law of motion when one object exerts a force on a second object what is true about the forces?

fomenos

Answer:

D.They are equal in magnitude and opposite in direction

Explanation:

Newton's third law states that the action force is always associated with a reaction force.
When a body 'A' exerts a force on body 'B', it is called the force of action.
When the body 'B' in turn resist the force of 'A' is called the reaction force. It is the reactive force acted upon by the body 'B' on 'A'.
This reaction force is equal in magnitude of the action force.
If the two bodies remain in the same horizontal line, the 'A' exerts a force in the direction towards 'B' and the body 'B' exerts a reaction force in the direction towards 'A'.
Hence, the two forces that are exerted by the bodies are equal in magnitude and opposite in direction.

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3 years ago