PLEASE HELP! What are two ways gravitational force is different from electric force?
(Select 2 answers)
A) Electric force only exists for short distances. Gravitational force exists even though objects may be millions of miles away?

B) Gravity only causes objects to be pulled together. Electric force can pull things together or push them apart.

C) Electric force is much stronger than gravitational force.

D) Electric force is measured in Coulombs while gravitational force is measured in Newtons.

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions