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##lambda=5m## ##v=f lambda## ##therefore lambda=v/f=(1430m//s)/(286Hz)=5m##.

I found ##9800N## The force should be its weight. This is the force (gravitational) between the Earth and the elevator…the only thing is that the Earth […]

The force ‘##F’=11.91k C^2//m^2##. The gives ##F=(k q_1q_2)/r^2## where ‘k’ is the proportionality constant. It is also called as coulomb’s constant as it as derived from […]

##4000## if doubled ##6000## if tripled Momentum=velocity x mass ##(mn =mv)## For initial stage ##mn = mv = 2000## if the speed is doubled ##mn = […]

It will be too long to type so here’s an image of the formulae: Image from: http://www.flinnsci.com/store/Scripts/prodView.asp?idproduct=21999 Hope this helps 🙂

Mass of the object and the distance between 2 objects of interest. We have the equation ##E_gravity=-GMm/r## ##G## is the universal gravitational constant. ##M## is the […]

1.07 1 inch ##=## 2.54 cm 42 inches ##=## ##42 times 2.54## cm 42 inches ##=## 107 cm 42 inches ##=## 1.07 metres

25 miles per hour is ##25/60## miles per minute. There are 1609.3 metres in a mile. Therefore ##25/60## * 1609.3 = 670.54 metres per minute.

##E/L=b/a## ##Effort-load-fulcrum## ##a: distance between effort and fulcrum## ##b:distance between load and fulcrum## ##E:Effort## ##L:Load## ##E*a=L*b## ##E/L=b/a##