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The definition of the index of refraction is ##n = c / v## where ##c## is the speed of light in a vacuum (##3 xx 10^ […]

##0.0335## ##(km)/h## We need to convert ##75## ##(mi)/h## into ##(km)/h## Cancel the hours in the denominator ##rarr75 (mi)/h*(1h)/(3600s)## (as ##1## hour is ##3600s##) ##rarr75 (mi)/cancelh*cancel(1h)/(3600s)## ##rarr75 […]

The lenght of the railroad at 40C is: ##30014.4m## The formula that we need is the thermal dilatation formula: ##l_2=l_1(1+lambdaDeltaT)## where ##l_1## is the initial lenght […]

Violet. Violet waves have the most of the visible spectrum. Remember: ## c=flambda## Therefore: ## f=c/lambda## Here ##c## is the speed of light in a vacuum. […]

There are 31536000 seconds in a year. This is just a series of conversion factors. 1 year ##=(365 days)/(1 year)xx(24 hrs)/(1 day)xx(60 min)/(1 hr)xx(60 sec)/(1 min)## […]

##4m/s^2[forward]## Recall that Newton’s ##2^nd## Law is given by the formula: ##color(blue)(|bar(ul(color(white)(a/a)F_net=macolor(white)(a/a)|)))## where: ##F_net=##sum of all forces acting on the object ##m=##mass ##a=## For this problem […]

Try this one I always found it easier than others. Consider: and: hope it helps!

Free fall means a body falls down under no influence of external force except gravitational force. So when a body is under free fall According to […]

I found a) in ##m^2## The surface area of your cylinder is given by the contribution of 3 parts: 2 circular (top and bottom) and a […]