Question

(which statement is true)....As you sit in a chair at your computer, the chair exerts an upward supporting force n on you, and gravity exerts a downward force Fg on you. To a fairly good approximation, n =− Fg . Is this an example of Newton’s third law? 1.No;n+Fg ≈0 is due to the fact that your upward or downward acceleration happens to be almost negligible. 2.Yes; the “action” Fg must produce a “re-action” n . 3.Yes; your velocity happens to be zero. 4.Yes; the chair is attached to the earth, so both n and Fg are exerted by the earth.

Answer 1

if you say that there is no relation to 3rd newton's law then what about a book lying on the table? its weight will act downward and reaction of table will be in upward direction by newton third law... I think it is similar case... what you say??

Answer 2

So you are sure about option 1. because it is a question from assignment and have marks too...

Answer 3

Thanks and please help me a little bit more if you like.. may I ask you 2-3 more questions??

Answer 4

A 2268 kg car is pulling a(n) 628.236 kg trailer. Together the car and the trailer have an acceleration of 2.65 m/s.s forward. The acceleration of gravity is 9.8 m/s.s
Neglecting frictional forces acting on the trailer, find the magnitude of the force exerted on the car by the road.
Answer in units of N

Answer 5

sending next question... just a min please

Answer 6

When you drop a 0.36 kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s^2 to-ward the earth’s surface. According to New-ton’s third law, the apple must exert an equal but opposite force on Earth. If the mass of the earth 5.98×10^24 kg, what is the magnitude of the earth’s acceleration toward the apple?
Answer in units of m/s^2

Answer 7

That 628.236 was ok... please review the recent question that I have sent..

Answer 8

Ok just last question... :)

Answer 9

That is the one that I tried the most but not getting right solution..

Answer 10

A 1.83 kg book in space has a weight of 7.65 N.
What is the value of gravitational field at that location?
Answer in units of N/kg?
First I find value of 'g' for that book that is 4.18m/s^2.
Then i find height 'h' of the book.
and then used the formula GM/(R+h)^2

Is that right?? answer is 4.157 N/kg

Answer 11

But that is the value of gravitational acceleration... gravitational energy and gravitational acceleration are same???

Answer 12

sorry gravitational field... not energy..

Answer 13

Ok.. and thanks a lot for your kind help...

Answer 14

ok... thanks once again..