Answer:
Option ( B ) is correct .
Explanation:
To lift a heavy weight , inclined plane is used . Use of inclined plane , makes the task easier because instead of force mg , force mg sinθ is to be used which is less than mg . Here θ is inclination of inclined plane.
If h be the height by which weight is to be lifted
potential energy acquired by weight = mgh
work done by force mg sinθ = mgsinθ x d where d is displacement required .
mg sinθ x d = mgh ( work done by force = potential energy stored in luggage )
d = h / sinθ
d will be more than h
Hence inclined plane increases the distance to be covered by force applied though it decreases the force itself.
Hence option ( B ) is correct .
Choice A is the right answer! Buy at high altitude and sell at low altitude
Hope this helps :)
Answer:comparing the total displacement and tota distance covered by Ben Jerry.
Explanation:
Total distance travelled by both is;
m+n=z
Total displacement of both is;
x+y=z
Therefore;
comparing equation 1 and 2;
x+y=m+n
The power required is 1.6 kW.
Answer:
Explanation:
Power is defined as the amount of work done on any object for a given time interval. In other words, power is the amount of force required to move an object in a given period of time.
Power = Work done / time taken for that work done.
Here the force is given as 800 N and the displacement is given as 2.5 m, while the time required for the displacement is given as 1.22 seconds.
So the power will be ratio of the product of force acting on the weightlifter, displacement of the weight to the time taken for that displacement.
Power = (800×2.5)/1.22 =1639 W
So the power required is 1.6 kW.