A flatbed truck is carrying a 20-kg crate up a sloping road. The ...

[BrownTown3]

A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30.
 
  What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?
  A) 13 B) 0.38 C) 17 D) 68 E) 22

Question 2

One difference between the light waves coming from a light bulb and water waves on a pond is that
 
  A) light waves all have the same wavelength, while different water waves can have different wavelengths.
  B) different light waves have different speeds, while all water waves must have the same speed.
  C) light waves can show interference effects, while water waves cannot.
  D) light waves occur in three dimensions while water waves occur in two dimensions.
  E) All of the above.

[juiceman1987]

Answer to Question 1

E

Answer to Question 2

D

[BrownTown3]

TYSM

[milbourne11]

Excellent