HELP PLEASE Give examples (with explanations) of the following forces on our roller coaster: a. Contact Force
b. Noncontact force
c. Balanced Force
d. Unbalanced Force
Be sure to answer in complete sentences and provide explanation for your example. (10 points)

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

Using gravity, an elephant can pull a mouse towards it from the ground. true or false explain why. will give brainliest if answered fast and the best explanation

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.