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2 years ago

14

A ball is tossed up into the air, reaches its highest point and returns to its original position. which of the following is true

about the balls velocity and acceleration at its highest point?
a) it’s velocity and acceleration are both zero

b) it’s velocity is up and non zero constant and acceleration is zero

c) it’s velocity is down and non zero constant and acceleration is zero

d) it’s velocity is zero and acceleration is up and non zero constant

e) it’s velocity is zero and acceleration is down and non constant zero

1 answer:

Nikitich [7]2 years ago

5 0

Answer:

At the top v =0 and there will be a acceleration due to gravity (g) acting downward.

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Answer:

$P=214.7187\,W$

Explanation:

Given that:

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diameter of the wire, $d=0.1\,cm=10^{-3}\,m$

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<u>Now we need the no. of turns incorporated in the length of 90 cm:</u>

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$\mu=$ permeability of the medium

n = no. of turns per unit length

I = current in the coil

So,

$n=\frac{900}{0.9}$

$n=1000\,turns\,.\,m^{-1}$

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$7.4\times 10^{-3}=4\pi\times10^{-7}\times 1000\times I$

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For copper we have resistivity:

$\rho=1.72\times 10^{-8}\, \Omega.m$

We know that resistance is given by:

$R=\rho.\frac{l}{a}$ .....................................(2)

where:

l = length of the conducting wire

a = cross sectional area of the conducting wire

<u>Now we need the length (l) of the wire:</u>

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$C=\pi.D$

$C=0.1\pi\,m$

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$a=\pi.\frac{d^2}{4}$

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