Answer:
a) 0 J
b) 0.92J
Explanation:
The work is defined as:
because the normal force is perpendicular to the displacement the work done for it is zero.
The force because of frictions has an angle of 180 degrees because it is opposite to the motion, so:
An escalator that takes 1.2 MJ every minute has a power output of 1200 kW.
An escalator used to lift people up from one floor to another, exerts a work (w) of 1.2 MJ in 1 minute (t).
In physics, power (P) is the amount of energy (w) transferred or converted per unit time (t).
We can convert 1.2 × 10⁶ W to kW using the conversion factor 1 kW = 1000 W.
An escalator that takes 1.2 MJ every minute has a power output of 1200 kW.
Learn more: brainly.com/question/24328975
Answer:
300
Explanation:
work done=force×displacement
=60*5=300J
power=work done/time
=300/3=100Js
Answer:
D
Explanation:
Telescopes detect electromagnetic waves from space and it travels back to the telescope lens in order for you to see.