In a museum exhibit of a simple pendulum, a very small but dense ...

[dollx]

In a museum exhibit of a simple pendulum, a very small but dense 6.0-kg ball swings from a very light 2.5-m wire.
 
  The ball is released from rest when the pendulum wire makes a 65 angle with the vertical, and it swings in a circular arc with no appreciable friction or air resistance. What is the tension in the wire just as the ball swings through its lowest position? A) 11 N
  B) 59 N
  C) 68 N
  D) 130 N
  E) 0 N

Question 2

A compound microscope consists of an objective lens of focal length f0 and an eyepiece that by itself produces an angular magnification 25.0.
 
  The microscope is designed so that the object to be viewed is on the left side of the objective lens and is focused in a plane that is 28.00 cm away from the right-hand (or inside) focal point of the objective lens. When properly adjusted, the eyepiece and the objective lens are 29.90 cm apart. The eyepiece magnification is based on an image at infinity and a near point at 25.0 cm. What is f0?

[joneynes]

Answer to Question 1

D

Answer to Question 2

0.90 cm

[dollx]

Excellent

[bdobbins]

Wow, this really help