Which of the following represents a covalent compound?

KF

NaCl

SBr3

Mg2O

If a force of 29 newtons is exerted on a 5kg ball, what is the balls acceleration

How do you use the lever (simple machines)

Two sets of staircases connect the floors of a tall building from ground level to rooftop. Staircase A is inclined at 30°. Staircase B is inclined at 45°.

Siven an element's atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?

Chromatic aberration affected: a. spectrographs b. radio telescopes c. refracting telescopes d. reflecting telescopes

An acrobatic airplane performs a loop at an airshow. The centripetal acceleration the plane experiences is 14.7 m/s2. If it takes the pilot 45.

Which of the following was NOT an outcome of Bacon's rebellion? A. A more direct focus on the "Indian Problem" B. A more focused plain to isolate black slaves from white servants C.

A science class did an investigation to see how many breaths it took for each student to blow up a balloon. Jason blew up his balloon with the fewest breaths. Which of these might explain why Jason took fewer breaths to blow up his balloon? A.

How the behavior of waves is affected by a medium

Suppose the gravitational force between two spheres is 100 N. If the distance between the spheres is halved, what is the new gravitational force between them?