Van der waals forces can best be described as the attractive or repulsive forces that are formed
here are the options:
a: between oppositely charged ions in a crystal.
b: during dipole-dipole interactions between molecules.
c: when molecules move apart in the absence of other forces.
d: by a random, short-lived redistribution of electrons.

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)

Madison pushes with a 210-n horizontal force on a 24-kg crate of coffee resting on a warehouse floor. the force of friction on the crate is 74 n. what is the acceleration?

In an experiment, how can i change human errors? be specific.