Answer:
B.150 N
Step-by-Step Explanation:
To find the amount of force we applied, we will use Newtons Law of Motion. The formula that is mainly used to solve for force is: .
Now we just simply multiply the two values to find N.
F = 150 N.
Answer:
Difference threshold or also Just Noticeable Difference
Explanation:
The above mentioned case between room mates, where one room mate was able to detect a minute change in volume shows an instance of the difference threshold.
Difference threshold can be defined as stimulation at its minimum level that can be detected by an individual almost 50 % of the times.
It is the lowest possible level of sound that is detectable by a person.
That is what happened in the mentioned case that when the volume was increased from 14 to 15, Amber was able to detect it.
Answer:
a) T=549.36N Upwards
b) T=448.56N Upwards
c) T=650.16N Upwards
Explanation:
The very first thing we can do to solve this problem is to draw a free body diagram we can use to analyze the situation (see attached picture).
On the diagram we can see there are only two forces acting on the object: the tension of the rope and the weight of the object itself.
a)
Since the object is moving at a constant speed, this means that its acceleration will be zero. So we can do a sum of forces like this:
T-W=0
T=W
T=mg
T=549.36N upwards
b)
For part b, since the object is accelerating downwards, we wil say that it's acceleration is negative, so
so we can do a sum of forces again:
so
T-W=ma
T=ma +W
T=ma+mg
T=m(a+g)
and now we substitute:
which yields:
T=448.56N upwards (in this particular case, the tension always goes upwards)
c)
Since the object is moving upwards, we can say that its acceleration will be positive, so
we can take the solved equation we got on the previous part of the problem, so we get:
T=m(a+g)
which yields:
T=650.16N upwards
Answer:62m/s
Explanation:
Initial velocity(u) =12m/s
Acceleration(a)=2.5m/s2
Time(t)=20seconds
Final velocity(v)=?
V=u+axt
V=12+2.5x20
V=12+50
V=62m/s
One of Kepler's laws is that the orbits of planets are elliptical. It's not a suggestion.
BTW, circles are ellipses too, but so special that their likelihood is close to zero.