Physics equations

Question 1

Equation for Power involving energy and time?

Including the rearranged equations.

Answer 1

P (W) = E (J) / t (s)

rearranged to : E = Pt

or : t = E / P

Question 2

What is the equation for current involving charge and time?

Include rearranged equations.

Answer 2

I (A) = Q (C) t (s) 
or
Q = It
or 
t = Q / I

Question 3

What is the equation for Power involving potential difference and current?

Include rearranged equations.

Answer 3

P = VI
or 
I = PV
or
V = RI
or
I = V / R

Question 4

What is the equation for power loss?

Answer 4

P = I^2R

Question 5

What is the equation for work involving charge and potential difference?

Include rearranged equations.

Answer 5

W = QV
or
V = W / Q
or
Q = W / V

Question 6

What is the equation for power involving potential difference and resistance?

Answer 6

P = V^2 / R

Question 7

What is the equation for potential difference involving resistance and current?

Answer 7

V = RI
or 
R = V / I
or
I = V / R

Question 8

What is the equation for temperature?

Answer 8

T = 1 / f

Question 9

What is the equation for efficiency?

Answer 9

efficiency = useful energy output / total energy input

Question 10

What is the equation for specific heat capacity?

Answer 10

E = mcDELTAt

c = E / mDELTAt

units: c = spec. heat capacity. (J/kgdegreesC)
E = energy (J)
m = mass (kg)
DELTAt = change in temp (K or degrees C)

Question 11

What is the equation for work done?

Answer 11

work done (J) = force (N) x distance (m)

Question 12

What is the equation for gravitational potential energy?

Answer 12

Ep (J) = m (kg) g (N/kg) h (m)

Question 13

What is the equation for kinetic energy?

Answer 13

Ek = 1/2mv^2
v = speed (m/s)
m = mass (kg)
Ek = ke (J)

Question 14

What is the equation for elastic potential energy?

Answer 14

Ee = 1/2ke^2

k = spring constant (N/m)
e = extension (m)
Ee = epe (J)

Question 15

What is the equation for the change in thermal energy?

Answer 15

DeltaE = mcDeltaTheta

Question 16

What does gravity equal?

Answer 16

9.8 N/kg or 10 rounded

Question 17

What is the equation for gradient?

Answer 17

Change in height / Change in base

Question 18

What is the equation for energy in terms of potential difference and charge?

Answer 18

E = VQ
or 
V = E / Q
or 
Q = E /V

Question 19

What is the equation for volume involving mass and pressure?

Answer 19

V = m / p
or 
p = m / V
or
m = Vp

Question 20

What is the equation for pressure?

Answer 20

P = F / A
P = (N/m^2)
F = (N)
A = (m^2)

Question 21

What is the equation for density?

Answer 21

Density = mass / volume

Question 22

What is the equation for pressure when Boyle’s law governs these variable?

Answer 22

P = constant x 1 / V (P = K / V)
rearranged
PV = constant (PV = K)
or
V = constant x 1 / P (V = K / P)

Question 23

What is the constant?

Answer 23

a number that doesn’t change ( can change in different scenarios)