Which of the following situations represents a negative displacement? (assume positive position is measured vertically upward along a y-axis.) a. a cat stands on a tree limb. b. a cat jumps from the ground onto a tree limb. c. a cat jumps from a lower tree limb to a higher one. d. a cat jumps from a tree limb to the ground. select the best answer from the choices provided a b c d

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

If a balloon is taken outside on a very cold day, what will occur?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)