Janetta ran a campaign for student body president, and she really wanted to win. She gave election buttons to everyone and told them how much she appreciated their friendship. Then Janetta told each person that she hoped for a vote. Are Janetta's actions altruistic? a. Yes, because she gave a gift and expressed her appreciation. b. No, because she is hoping that people will vote for her. c. Yes, because her kind compliments probably made others feel good. d. No, because running for president always means people are dishonest.

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.

How do the types of electromagnetic waves differ