<span>We can use a simple equation to find the time for the feather to fall to the surface.
y = (1/2) g t^2
y is the height
g is the acceleration due to gravity
t is the time
t^2 = 2y / g
t = sqrt{ 2y / g }
t = sqrt{ (2) (1.40 m) / (1.67 m/s^2) }
t = sqrt { 1.6766 s^2 }
t = 1.29 seconds
It takes 1.29 seconds for the feather to fall to the surface.</span>
Answer:
Q = 177J
Explanation:
Specific heat capacity of lead=0.13J/gc
Q=MCΔT
ΔT=T2-T1,where T1=22degrees Celsius and T2=37degree Celsius.
ΔT=37 - 22 = 15
Q = Change in energy
M = mass of substance
C= Specific heat capacity
Q = (91g) * (0.13J/gc) * (15c)= 177.45J
Approximately, Q = 177J
14.58? All numbers are significant except 0 unless 0 is between two numbers