Neglecting air resistance, what will happen to a projectile that is fired vertically at 8 km/s? At 12 km/s?
The condition of projectile if it fired vertically at given speeds.
Answer to Problem 15A
When initial speed of a projectile is 8 km/s, then it will come back to the Earth’s surface.
When initial speed of a projectile is 12 km/s, then it will escape.
Explanation of Solution
Introduction:
Escape velocity is the minimum velocity that is required to escape an object from the influence of Earth’s gravitational of Earth.
The escape velocity of an object is 11.186 km/s from the Earth’s surface. Consider the case when initial velocity is 8 km/s. Since the initial velocity is less than the escape velocity of Earth, so an object will go up to a maximum height at which velocity becomes zero and then comes back to the ground.
Consider the case when initial velocity is 12 km/s. Since the initial velocity is greater than the escape velocity of Earth, so an object will escape from the Earth’s gravitation influence.
Chapter 14 Solutions
Conceptual Physics: The High School Physics Program
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