A biology teacher drives from Naperville over the Cleveland to visit her sister. During the trip there, she travels the first half of the time at 60 km/hr and the second half the time at 95 km/hr. When she comes back, she drives the first half the distance at 60 km/hr and the second half of the distance at 95 km/hr. Required:
a. What is her average speed going over to Cleveland?
b. What is her average speed coming back from Cleveland?
c. What is his average speed during the entire trip?
d. What is his average velocity during the entire trip?

He viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".