Figure 13-44 gives the po- tential energy function U(r) of a projectile, plotted outward
from the surface of a planet of radius Rs. What least kinetic energy is required of a projectile launched at the surface if the
projectile is to “escape” the planet?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

3. which is not a primary color of light? blue red green yellow