Engr 103 Test 1 With
Solution
10 lbm x 12 ft/s^2= 120 lbm ft/s^2 - ANSWER True
A golf ball with a mass of 0.05 kg on earth has a mass of 0.81 N on the moon
if the moon's
gravity is 1.62 m/s2 - ANSWER False (mass is always the same regardless of
gravity)
When algebraically manipulating an equation, you should leave an equation
in
symbolic terms for as long as possible before plugging in values - ANSWER
True
Know all types of lines for drawings -
gc is always equal to one - ANSWER true (it is a conversion factor which is
always =1)
An object will weigh exactly the same no matter where it is on earth -
, ANSWER False (weight is different with different g, g is not the same
everywhere on earth)
An object will have the same mass no matter where it is in the universe -
ANSWER True
Dimensions are independent of units - ANSWER True
Engineers use a rule of thumb that answers have ____significant figures. -
ANSWER 3
The following equation is dimensionally consistent:
P=Fg/(2uD)
where P = pressure with base units of M/(t2L),
F = force with base units of ML/t2,
g = acceleration of gravity with units of L/t2
u = velocity with base units of L/t, and
D = diameter with base units of L - ANSWER False M/t2L doesnt = M/t3
_______ are based upon known standards some of which are kept in special
conditions
Solution
10 lbm x 12 ft/s^2= 120 lbm ft/s^2 - ANSWER True
A golf ball with a mass of 0.05 kg on earth has a mass of 0.81 N on the moon
if the moon's
gravity is 1.62 m/s2 - ANSWER False (mass is always the same regardless of
gravity)
When algebraically manipulating an equation, you should leave an equation
in
symbolic terms for as long as possible before plugging in values - ANSWER
True
Know all types of lines for drawings -
gc is always equal to one - ANSWER true (it is a conversion factor which is
always =1)
An object will weigh exactly the same no matter where it is on earth -
, ANSWER False (weight is different with different g, g is not the same
everywhere on earth)
An object will have the same mass no matter where it is in the universe -
ANSWER True
Dimensions are independent of units - ANSWER True
Engineers use a rule of thumb that answers have ____significant figures. -
ANSWER 3
The following equation is dimensionally consistent:
P=Fg/(2uD)
where P = pressure with base units of M/(t2L),
F = force with base units of ML/t2,
g = acceleration of gravity with units of L/t2
u = velocity with base units of L/t, and
D = diameter with base units of L - ANSWER False M/t2L doesnt = M/t3
_______ are based upon known standards some of which are kept in special
conditions
