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ad-work [718]
3 years ago
15

A rock of mass m is twirled on a string in a horizontal plane. The work done by the tension in the string on the rock is:

Physics
1 answer:
Varvara68 [4.7K]3 years ago
7 0

Answer: c) 0

Explanation:

Work tension is zero because in any infinitesimal time interval, the tension force is directly perpendicular to the displacement.

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3 years ago
A gold wire that is 1.8 mm in diameter and 15 cm long carries a current of 260 mA. How many electrons per second pass a given cr
Musya8 [376]

Answer:

162500000.  

Explanation:

Given that

Diameter of the wire , d= 1.8 mm

The length of the wire ,L = 15 cm

Current ,I = 260 m A

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We know that Current I is given as

I=\dfrac{q}{t}

I=Current

q=Charge

t=time

q= I t

q= 260 m t

The total number of electron = n

q= n e

n=\dfrac{260\times 10^{-3}\ t}{1.6\times 10^{-9}}

n=162500000 t

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3 years ago
How can a magnetic field be produced, using a wire, a battery, and and a nail?
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Step 1 - Gather the Materials
One iron nail fifteen centimeters (6 in) long
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