a 7.5kg object is placed on a spring scale. if the scale reads 78.4 n what is the acceleration of gravity at that location

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

The speed of light can be used to measure the

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current