Chapter 9-11 Formulas

Question 1

Impulse force (J)

Answer 1

J= Favg (delta t)

Question 2

Impulse force graph- shows force over time

Answer 2

J= 1/2 base x height

Question 3

Impulse momentum

Answer 3

J= Pf - Pi ; J= mVf- mVi;

Question 4

Total momentum

Answer 4

Pnet= P1 + P2 + P3

Question 5

Angular momentum (L)

Answer 5

L = I x (delta w); w= angular velocity and I = moment of inertia

Question 6

Angular momentum SI units

Answer 6

Kg m^2/s

Question 7

max efficiency

Answer 7

1-Tcold/Thot (reservoirs)

Question 8

Angular momentum & torque

Answer 8

torque x delta(t)= I x delta(w)

Question 9

Heat pump

Answer 9

Qhot=Qcold + Win

Question 10

Heat engine

Answer 10

Wout= Qhot - Qcold

Question 11

Work formula

Answer 11

W=Fd (force times distance); use only force parallel to displacement

Question 12

Work SI unit

Answer 12

Joules (or Newton meters)

Question 13

Work at an angle

Answer 13

W= Fd cos theta

Question 14

Translational kinetic energy

Answer 14

W=delta K= 1/2mVf^2- 1/2mVi^2

Question 15

Rotational kinetic energy

Answer 15

Krot= 1/2mr^2w^2; Krot= 1/2 I w^2 (where I is moment of inertia

Question 16

Gravitational Potential Energy

Answer 16

W= Ugf- Ugi; Ug= mg(delta y)

Question 17

Elastic Potential Energy

Answer 17

delta Us= 1/2 kx^2

Question 18

Thermal Energy

Answer 18

Delta Eth= fk (delta x); fk= kinetic friction force

If through a fluid, substitute Drag for kinetic friction. Drag= 1/2 CdpAv^2

Question 19

Work - total Energy equation

Answer 19

delta K + delta U + delta Eth = W

Question 20

Before & after work-energy equation

Answer 20

Kf + Uf + Eth = Ki + Ui + W

Question 21

Chemical energy

Answer 21

deltaEchem= N delta Erxn; N is number of reactions

Question 22

Perfectly elastic collision

Answer 22

V1(f) = V1(i) x (m1-m2)/(m1 + m2); 
V2(f)= V1(i) x 2m1/(m1 + m2)

Question 23

Power

Answer 23

P= delta E/delta t or W/delta t