Explanation:
Given that,
Mass of the car, m = 710 kg
Speed of the car, v = 23 m/s
Drag force, F = 500 N
(a) Let P is the power is required from the car's engine to drive the car on the level ground. Power is given by :
(b) Let P is the power is required from the car's engine to drive the car on up a hill with a slope of 2 degrees.
At this slope, force will be, 
Total force will be :
Power is given by :
or
P = 17 kW
Answer:
Same work is done by the two workers
The first worker exerts more power than the second person
Explanation:
Work is the product of force and distance moved in the direction of the applied force
Power is the rate at which work is done
An example of a system with decreasing gravitational potential energy is a ball in free fall.
At its initial height h, the ball has a gravitational potential energy equal to
where m is the ball mass and g is the gravitational acceleration. As the ball falls toward the ground, its height h decreases, and so its gravitational potential energy decreases as well, according to the formula
where h' is the new height of the ball.
Answer:
B. Medium
Explanation:
I don't know how to explain it but I already did this lesson in school
It goes in the downward direction
