Answer:
Work done is equal to 125.44 J
Explanation:
We have given mass of the student m = 80 kg
Distance moved d = 4 m
Acceleration due to gravity
Coefficient of kinetic friction
So normal force exerted by student
We know that work done is equal to multiplication of force and distance
So work done
147.09975 newton meters per second
Answer:
The circuit is a parallel circuit as the voltage is splitting in equal halves for the light bulbs
Didn't we do this one yesterday ?
If two waves combine and the result has less amplitude than either of
the original waves, then there has been DESTRUCTive interference.
I think #3 is a compound microscope, but I'm not sure.
First, we must recall that distance is the total length traveled by an object in which the direction of the motion does not matter. Meanwhile, displacement is the distance of the object from its starting point which means the directions matters for displacement.
Now, speed is distance over time while velocity is displacement over time. Since we're talking about the same object's motion, the total time traveled is (120 + 90) = 210 seconds.
Now, the total distance traveled by the object is (400 + 250) = 650 m. Meanwhile the total displacement traveled by the object is 400 m, East + 250 m, West = 150 m, East.
Now, to find the speed and velocity, we just divide the values of distance and displacement, respectively, over time. Thus, we have
speed = 650 m / 210s ≈ 3.095 m/s
velocity = 150 m, East /210 s ≈ 0.714 m/s, East
Now, rounding the values up to 2 significant digits, we have
a) speed = 3.1 m/s
b) velocity = 0.71 m/s, East