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3 years ago

12

meg runs a 10-km race in 45 minutes (0.75 hours). what was her speed in kilometers per hour ? a. 7.5 km/hr b. 4.5 km/hr c. 13 km

/hr d. 22 km/hr

1 answer:

cricket20 [7]3 years ago

3 0

The answer would be C.

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At what stage of a reaction do atoms have the highest energy?

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3 years ago

The velocity of a wave is 500 m/s . The wavelength of the wave is 3.2 m . What is the frequency of the wave ?

nasty-shy [4]

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3 years ago

A 160cm long string has two adjacent resonance at 85hz frequencies . calculate : 1- the fundamental frequency , 2- the speed of

lara [203]

Length=l=160cm=1.6m

Frequency=85Hz

#1

Fundamental frequency be v

$\\ \sf\bull\longmapsto v=\dfrac{\nu}{2\ell}$

$\\ \sf\bull\longmapsto v=\dfrac{85}{2(1.6)}$

$\\ \sf\bull\longmapsto v=\dfrac{85}{3.2}$

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#2

First we have to find wavelength

$\\ \sf\bull\longmapsto \lambda=\dfrac{c}{v}$

$\\ \sf\bull\longmapsto \lambda=\dfrac{3\times 10^8ms^{-1}}{26.6}$

$\\ \sf\bull\longmapsto \lambda=0.112\times 10^8m$

$\\ \sf\bull\longmapsto \lambda=112\times 10^5m$

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Now..

Velocity be v

$\\ \sf\bull\longmapsto v=f\lambda$

f is frequency

$\\ \sf\bull\longmapsto v=26.5\times1.12\times 10^6m$

$\\ \sf\bull\longmapsto v=29.68\times 10^6$

$\\ \sf\bull\longmapsto v=2.9\times 10^7m/s$

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3 years ago

A 1.0kg ball has a momentum of 12kg m/s what is the balls speed

Anastasy [175]

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$p=mv$
where
p is the momentum
m is the mass
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The ball in our problem has a mass of m=1.0 kg and a momentum of $p=12 kg m/s$ , therefore we can use the previous formula to find its velocity:
$v= \frac{p}{m}= \frac{12 kg m/s}{1.0 kg}=12 m/s$

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3 years ago