If the net force equals zero, what is true?

- the object may be at rest

- the object may be in motion

- the object is not accelerating

- all of the above

What are positive and negative effects we have on our atmosphere?

A piece of wood is floating in a tub of water. a second piece of wood rest on top of the first piece; it does not touch the water. if the second piece is removed from the first and placed in the water, what happens to the water level in the tub

A total charge of 16μc passes through a cross-sectional area of a nichrome wire in 4 s. how many electrons pass through the cross-sectional area in 16 s?

In which of the following situations is light most likely to be reflected? A. when it strikes a dark-colored object B. when it strikes a shiny object C. when it travels through outer space D. when it travels through water and then through air

The element carbon exists in several different forms. Pure carbon can be found in the form of diamonds, coal, and the graphite in your pencil. Which statement concerning carbon is FALSE? A) All carbon atoms have 6 protons.

Why is it that a football does not stay in motion at a constant speed when thrown, as the First Law of Motion suggests that it would? 1) Air resistance and acceleration 2) Gravity and mass 3) Distance, mass and gravity 4) Air resistance and gravity

A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. approximately how much work does the student do against friction in moving the box 5.

The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature.

A piano emits frequencies that range from a low of about 28 hertz to a high of about 4200 hz. find the range of wavelength in air attained by this instrument when the speed of sound in air in 342m / s

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal.