Astudent woke up in the morning and checked the rain gauge in her backyard. the rain gauge was empty, but the grass was moist. which of the following best explains how this could happen?

a. it snowed, but did not rain during the night.
b. run-off from a nearby river made the grass wet.
c. water vapor condensed on the grass.
d. the water in the rain gauge evaporated, but the water on the grass did not.

explain why you choose the answer you did.

you!

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward