Lecture12 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 12...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 12
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Newton’s Law of gravitation Kepler’s Laws of Planetary motion Ellipses with sun at focus Sweep out equal areas in equal times Last Lecture F grav = GMm R 2 G = 6.67 × 10 - 11 Nm 2 / kg 2 R 3 T 2 = GM 4 p 2 = Constant
Background image of page 2
PE = mgh valid only near Earth’s surface For arbitrary altitude Zero reference level is at r= PE = -  Gravitational Potential Energy
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example 7.18 You wish to hurl a projectile from the surface of the Earth (R e = 6.38x10 6 m) to an altitude of 20x10 6 m above the surface of the Earth. Ignore rotation of the Earth and air resistance. a) What initial velocity is required? b) What velocity would be required in order for the projectile to reach infinitely high? I.e., what is the escape velocity? c) (skip) How does the escape velocity compare to the velocity required for a low earth orbit? a) 9,736 m/s b) 11,181 m/s c) 7,906 m/s
Background image of page 4
Chapter 8 Rotational Equilibrium and Rotational Dynamics
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wrench Demo
Background image of page 6
Torque Torque, τ , is tendency of a force to rotate object about some axis F is the force d is the lever arm (or moment arm) Units are Newton-meters τ= Fd Door Demo
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Torque is vector quantity Direction determined by axis of twist Perpendicular to both r and F
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 31

Lecture12 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 12...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online