Answer: 15Nm
Explanation:
Work is said to be done when a force cause a body to move through a distance. Mathematically,
Work = Force (F) × distance (s)
If F = F~ = (3 N)ˆı + (−1 N) ˆj + (7 N) ˆk
S = (5 m)ˆı + (3 m) ˆ + (−4 m) ˆk
According to vector notation,
i.I = j.j =k.k = 1
Multiplication of different component will give 'zero'
F×s = (3 N)ˆi × (5 m)ˆı
Work done = 15Nm
Answer:
c. Line - voltage thermostats and controls are not as sensitive as low - voltage thermostats.
Explanation:
Line voltage thermostat is a regulator which senses the temperature and maintains it to keep the desired level of the voltage. The license in required for the electricians to work on the voltage control wirings. There is technical aspects which an electrician must understand before working on the circuits and voltage lines.
Answer:
<em><u>Incomple</u></em><em><u>te</u></em><em><u> </u></em><em><u>ques</u></em><em><u>tion</u></em><em><u>!</u></em>
you have to provide mass to get acceleration
as Newton's 2nd law, force=mass×accln
now,here force toward D is 100N,if it hav mass m
then accln will be 100/m
The new gravitation force at the new location is 40 N
Explanation:
The weight of the astronaut is given by the equation
(1)
where
m is the mass of the astronaut
g is the acceleration of gravity
The acceleration of gravity at a certain distance
from the centre of the Earth is given by
![g=\frac{GM}{r^2}](https://tex.z-dn.net/?f=g%3D%5Cfrac%7BGM%7D%7Br%5E2%7D)
where G is the gravitational constant and M is the Earth's mass. So we can rewrite eq.(1) as
![F=\frac{GMm}{r^2}](https://tex.z-dn.net/?f=F%3D%5Cfrac%7BGMm%7D%7Br%5E2%7D)
When the astronaut is on the Earth's surface,
(where R is the Earth's radius), so his weight is
![F=\frac{GMm}{R^2}=640 N](https://tex.z-dn.net/?f=F%3D%5Cfrac%7BGMm%7D%7BR%5E2%7D%3D640%20N)
Later, he moves to another location where his distance from the Earth's surface is 3 times the previous distance, so the new distance from the Earth's centre is
![r'=3R+R=4R](https://tex.z-dn.net/?f=r%27%3D3R%2BR%3D4R)
Therefore, the new weight is
![F'=\frac{GMm}{(4R)^2}=\frac{1}{16}\frac{GMm}{R^2}=\frac{F}{16}](https://tex.z-dn.net/?f=F%27%3D%5Cfrac%7BGMm%7D%7B%284R%29%5E2%7D%3D%5Cfrac%7B1%7D%7B16%7D%5Cfrac%7BGMm%7D%7BR%5E2%7D%3D%5Cfrac%7BF%7D%7B16%7D)
Which means that his weight has decreased by a factor 16: therefore, the new weight is
![F'=\frac{640}{16}=40 N](https://tex.z-dn.net/?f=F%27%3D%5Cfrac%7B640%7D%7B16%7D%3D40%20N)
Learn more about gravitational force:
brainly.com/question/1724648
brainly.com/question/12785992
#LearnwithBrainly
I wanna say A.
Not a 100% sure but this is what i think
hope it helps!