A train is traveling due south at a constant velocity of 86 ...

[tiffannnnyyyyyy]

A train is traveling due south at a constant
  velocity of 86 mi/h. Any unbalanced force
  acting on the train with respect to the Earths
  surface must be
  a)zero.
  b)directed vertically upward.
  c)directed toward the south.
  d)directed vertically downward.

Question 2

A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
 a. 39 cm/s
  b. 42 cm/s
  c. 45 cm/s
  d. 35 cm/s
  e. 53 cm/s

[brittrenee]

Answer to Question 1

a

Answer to Question 2

b

[tiffannnnyyyyyy]

Thank you!

[brittrenee]

Always glad to help...