Phys Exam IV

Any two objects with mass exert a gravitational force on one another and the force is ____ but ___

Equal, Opposite

Newton’s Law of Universal Gravitation Formula

F = GMm / r²

Newton’s Law of Universal Gravitation Formula: what G, M, m, and r are

G: 6.674 E-11

M and m: masses of two bodies

r: distance between their centers

Acceleration due to gravity formula

g = GM / r²

Gravitational potential energy

U = G(mew)m / r

Wave formula

v = lambda(f) where;

v = m/s

lambda = m

f = Hz (1/s)

Period T formula

T = total time / total events

Linear frequency

f = 1/T

Angular frequency formula

w = 2pi/T or 2pif

Simple Harmonic Motion Equation

x = Acos(wt) MUST BE IN RADIANS

Max speed equation for simple harmonic motion

vmax = Aw

Energy for a spring formula

E = ½KA²

Intensity of a wave formula

I = P/A where P is the power and A is 4(pi)r²

Comparing intensities formula

I₁r₁² = I₂r₂²

What formula do you use if you have w/m_² and want dB?

B = 10log(I/I₀)

What formula do you use if you have dB and have w/m_²?

I = I₀10^B/10

For the Doppler’s Equation what signs for the num and denom do you use if something is moving towards you?

A + for the num and a - for the denom. f^’ > f

For the Doppler’s Equation what signs for the num and denom do you use if something is moving away from you?

A - for the num and a + for the denom. f^’ < f