Physics 151 Midterm 1 Exam Questions With
Complete Answers
Formula for Magnitude - ANSWER √(x^2+y^2+z^2)
Absolute value of the vector components added up.
How to find a unit vector - ANSWER Divide the Vector by the magnitude.
What is a unit vector and how do you write it? - ANSWER Written with a carrot on top ^
and it is a vector of magnitude 1 that describes direction
How to draw a graphical addition of vectors - ANSWER * Draw first vector A
* Draw second vector B with its tail starting at the tip of A
* Draw AB from tail of A to tip of B
How to draw graphical subtraction of vectors - ANSWER * Draw first vector A
* Draw second vector B with its tail starting at the tail of A
* Draw AB from the tip of B to the tip of A
How to find Vavg - ANSWER Δ r (vector) / Δ t
, Position update equation - ANSWER r (final vector) = r (initial vector) + v (vector) * Δ t
How to find unit vector given angles? - ANSWER (cos x, cos y, cos z)
What is the momentum equation for objects at normal speeds? - ANSWER p=mv
What is momentum? - ANSWER Momentum is the force required to change an object's
motion (it will be greater with greater mass and velocity)
What is the momentum equation for particles at high speeds? - ANSWER p=γ mv
p and v are vectors
γ = gamma
How do you find gamma? - ANSWER γ = 1 / √(1-(|v|/c)^2)
v is a vector
What is the value of c? - ANSWER c= 3*10^8
What is instantaneous velocity? And how do I find it? - ANSWER Slope of velocity at any
given time
Complete Answers
Formula for Magnitude - ANSWER √(x^2+y^2+z^2)
Absolute value of the vector components added up.
How to find a unit vector - ANSWER Divide the Vector by the magnitude.
What is a unit vector and how do you write it? - ANSWER Written with a carrot on top ^
and it is a vector of magnitude 1 that describes direction
How to draw a graphical addition of vectors - ANSWER * Draw first vector A
* Draw second vector B with its tail starting at the tip of A
* Draw AB from tail of A to tip of B
How to draw graphical subtraction of vectors - ANSWER * Draw first vector A
* Draw second vector B with its tail starting at the tail of A
* Draw AB from the tip of B to the tip of A
How to find Vavg - ANSWER Δ r (vector) / Δ t
, Position update equation - ANSWER r (final vector) = r (initial vector) + v (vector) * Δ t
How to find unit vector given angles? - ANSWER (cos x, cos y, cos z)
What is the momentum equation for objects at normal speeds? - ANSWER p=mv
What is momentum? - ANSWER Momentum is the force required to change an object's
motion (it will be greater with greater mass and velocity)
What is the momentum equation for particles at high speeds? - ANSWER p=γ mv
p and v are vectors
γ = gamma
How do you find gamma? - ANSWER γ = 1 / √(1-(|v|/c)^2)
v is a vector
What is the value of c? - ANSWER c= 3*10^8
What is instantaneous velocity? And how do I find it? - ANSWER Slope of velocity at any
given time
