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defon
3 years ago
13

Is work being done on a barbell when a weight lifter is holding the barbell over his head?

Physics
1 answer:
Artemon [7]3 years ago
5 0

Answer:

Because in order for work to be done on an object, the object must be moving. Why isn't work being done on a barbell when a weight lifter is holding the barbell over his head? Work is maximized when force is applied in the same direction that the object is moving. ... In order to do work faster, more_is required.

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How is silver, gold, and bronze different.
joja [24]

Answer:

Silver is a malleable and ductile metal having atomic number 47 and symbol Ag. Gold on the hand has atomic number 79 and symbol Au. It is also ductile and malleable. Both are soft and lustrous in nature. Both are transition metals.

Bronze is an alloy of majority of copper and some amount of tin.  Formation of alloy enhances the properties of the metal and its industrial use. Bronze is harder than copper and easily fusible and easy to cast. It is resists corrosion.

Silver and gold have different atomic numbers, different colors. Both are transition elements where as Bronze is an alloy.

6 0
3 years ago
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A meter stick whose mass is 330 grams lies on ice. You pull at one end of the meter stick, at right angles to the stick, with a
Sophie [7]

Answer:

initial magnitude will be 9 N and direction will be to the right

Explanation:

force= 9N

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acceleartion = a

from newtons 2nd law of motion we write

F= \frac{\mathrm{dP} }{\mathrm{d} t}

dP is the chage in momentum dt is time taken and F is the Force applied

9N= \frac{\mathrm{dP} }{\mathrm{d} t}

this shows that the rate of change of momentum is 9 N

we also know that F= ma

putting values we get

9= 0.330\times a

a= 27.27 m/sec^2

The direction of acceleration will along the direction of force applied. So will be the direction of change momentum as in F=ma,  mass is the scalar quantity and direction of force dictates the direction of motion. Hence, initial magnitude will be 9N and direction will be to the right

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3 years ago
What can you infer about a wave with a long wavelength?
katovenus [111]

Answer:

It has a high frequency

Explanation:

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Answer:

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What could you do to increase the electric potential energy between two
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