John rides his motorcycle with a constant speed of 40 miles per hour. How far can he travel in 1/2 an hour?
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Incomplete question as the angle between the force is not given I assumed angle of 55°.The complete question is here
Two forces, a vertical force of 22 lb and another of 16 lb, act on the same object. The angle between these forces is 55°. Find the magnitude and direction angle from the positive x-axis of the resultant force that acts on the object. (Round to one decimal places.)
Answer:
Resultant Force=33.8 lb
Angle=67.2°
Explanation:
Given data
Fa=22 lb
Fb=16 lb
Θ=55⁰
To find
(i) Resultant Force F
(ii)Angle α
Solution
First we need to represent the forces in vector form
Total Force
The Resultant Force is given as
For(ii) angle
We can find the angle bu using tanα=y/x
So
Answer:
a)
b) mg>N
c)
d)
Explanation:
In order to solve part a) of the problem, we can start by drawing a free body diagram of the presented situation. (see attached picture).
In this case, we know the centripetal acceleration is given by the following formula:
where:
we know the period of rotation of the earth is about 24 hours, so:
so we can now find the angular speed:
So the centripetal acceleration will be:
which yields:
b)
In order to answer part b, we must draw a free body diagram of us sitting on a chair. (See attached picture.)
So we can do a sum of forces in equilibrium:
so we get that:
and solve for the normal force:
In this case, we can clearly see that:
therefore mg>N
This is because the centripetal acceleration is pulling us upwards, that will make the magnitude of the normal force smaller than the product of the mass times the acceleration of gravity.
c)
So let's calculate our weight and normal force:
Let's say we weight a total of 60kg, so:
and let's calculate the normal force:
N=586.58N
so now we can calculate the percentage change:
so we get:
which is a really small change.
d) In order to find this acceleration, we need to start by calculating the radius of rotation at that point of earth. (See attached picture).
There, we can see that the radius can be found by using the cos function:
In this case:
so we can solve for r, so we get:
in this case we'll use the average radius of earch which is 6,371 km, so we get:
which yields:
r=4,551.91 km
and now we can calculate the acceleration at that point:
