# Rate of change of surface area of sphere

# 01 Minimum length of cables linking to one point

# Deflections Determined by Three-Moment Equation

# Angle between two chords

# Problem 01 - Equation of a curve

# 02 - Bullet fired from the top of a building

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**Problem 02**

A bullet is fired at an initial velocity of 150 m/s and an angle of 56° at the top of a 120 m tall building. Neglecting air resistance, determine the following:

- The maximum height above the level ground that can be reached by the bullet.
- The time for the bullet to hit the ground.
- The velocity with which the bullet will hit the ground.

# The Moment Distribution Method

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Moment distribution is based on the method of successive approximation developed by Hardy Cross (1885–1959) in his stay at the University of Illinois at Urbana-Champaign (UIUC). This method is applicable to all types of rigid frame analysis.