If the box is moving at constant velocity, net force must be zero, so:
F + fr = 0
fr = -F
<u>fr = -40 N</u>
D. lenses focus light , mirrors do not
True the amplitude of a wave determines the volume of a sound
vf ^2 = kx^2/m = 56(0.75)^2 / 2.5 = 12.6
Therefore, v= 3.5 m/s.
Answer:
The hottest temperature is 
Explanation:
From the question we are given



Generally converting
to Fahrenheit

=> 
=> 
Converting
to Fahrenheit

=> 
=>
Now comparing the temperature in Fahrenheit we see that
is the hottest