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notka56 [123]
3 years ago
14

How much force is required to move a sled 5 meters if a person uses 60 J of work?

Physics
1 answer:
DerKrebs [107]3 years ago
3 0
Force = work / dis
           = 60/ 5
           = 12 N
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A textbook is pushed across a desk. It experiences what type of force ​
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Answer:

kinetic friction force

Explanation:

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A student examines a 20-meter long rectangular stream channel and takes the following measurements: width of stream = 4 meters,
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Answer:

The discharge of the stream at this location is 40 cubic meters per second.

Explanation:

The discharge is the volume flow rate of the water in the stream. For this purpose we can use the following formula:

Discharge = Volume Flow Rate = (Cross-Sectional Area)(Velocity of Stream)

Volume Flow Rate = (Width of Stream)(Depth of Stream)(Velocity of Stream)

Volume Flow Rate = (4 meters)(2 meters)(5 meters per second)

<u>Volume Flow Rate = 40 cubic meters per second</u>

Therefore, the discharge of the stream at this location is found to be <u>40 cubic meters per second</u>

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J.J. Thomson theorized that, if an atom had all of its negatively charged
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C. Positively charged

Explanation:

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Which type of energy is transferred by convection currents?
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Answer: thermal

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Moving particles transfer thermal energy through a fluid by forming convection currents.
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Read 2 more answers
We would like to place an object 45.0cm in front of a lens and have its image appear on a screen 90.0cm behind the lens. What mu
liubo4ka [24]

Answer:

the radii of curvature is 30 cm.

Explanation:

given,

object is place at = 45 cm

image appears at = 90 cm

focal length = ?

refractive index = 1.5

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\dfrac{1}{f} = \dfrac{1}{u} +\dfrac{1}{v}

\dfrac{1}{f} = \dfrac{1}{45} +\dfrac{1}{90}

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using lens formula

\dfrac{1}{f} = (n-1)(\dfrac{1}{R_1} -\dfrac{1}{R_2})

R_1 = R\ and\ R_2 = -R

\dfrac{1}{f} = (n-1)(\dfrac{1}{R} +\dfrac{1}{R})

R = (n -1)\ f

R = 2(1.5 -1)\ 30

R = 30 cm

hence, the radii of curvature is 30 cm.

3 0
3 years ago
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