What do radio waves and microwaves have in Common?
<u>A) Both are at the ideological the spectrum that has the lowest frequency. </u>
B) Both are at the spectrum that has the shortest wavelengths.
C) Both have higher frequencies than visible light.
Answer:
W = 7000 J
Explanation:
To solve this problem we use that the speed of the bicycle is constant, therefore its acceleration is zero
F -fr = 0
F = fr
where F is the force applied by the child
Work is defined by
W = F. x
W = F x cos θ
in this case the child's force is parallel to the movement, therefore the angle is zero and cos 0 = 1
let's calculate
W = 35 200
W = 7000 J
For this problem, you would use the equation v=u+at. In this case, u=1 v=0 (when the object is at rest) a=-1
v=u+at
0=1+(-1)t
t=1 second
Visit in www.technology.com its answer is in page no. 4