A. <span>Standing is health-enhancing because it uses energy.
Because standing can burn a lot of calories.</span>
Speed of Ferry is towards North with magnitude 6.2 m/s
Here if we assume that North direction is along Y axis and East is along X axis then we can say
Now a person walk on ferry with speed 1.5 m/s towards east with respect to Ferry
so it is given as
also by the concept of relative motion we know that
now plug in all values in it
now if we need to find the speed of the person then we need to find its magnitude
so it is given as
Answer:
A. 98,000 J
Explanation:
The gravitational potential energy of an object is given by
U = mgh
where
m is the mass of the object
g is the gravitational acceleration
h is the heigth above the ground
In this problem,
m = 2000 kg
g = 9.8 m/s^2
h = 5.0 m
Substituting into the equation, we find
The power needed is 0.0054 hp
Explanation:
First of all, we need to convert the mass from pounds to kilograms:
Then we have to convert the height from feet to meters:
The weight of the object is:
Now we can calculate the work needed to lift the box, which is equal to the change in gravitational potential energy of the object:
The power required to lift the object is given by:
where
W = 40.5 J is the work done
t = 10 s is the time taken
Substituting,
And finally, we can convert into horsepower, keeping in mind that
1 hp = 746 W
We find
Learn more about power:
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