Q. 1: The Earth pulls down on you with a gravitational force that wecall your we
ID: 1721647 • Letter: Q
Question
Q. 1:
The Earth pulls down on you with a gravitational force that wecall your weight. Do you pull up on the Earth with the same amountof force?
Q 2:
Describe a few examples in which the force of friction exertedon an object is in the direction of motion of theobject.
Q 3:
Consider a lamp hanging from a chain. What is the tension in thechain?
Q 4:
Does a speeding missile possess force?
Q 5:
Why does a book sitting on a table never accelerate"spontaneously" in response to the trillions of inter-atomic forcesacting withinit?
Q 6:
Explanation / Answer
Q. 1:The Earth pulls down on you with a gravitational force thatwe call your weight. Do you pull up on the Earth with the sameamount of force?
Yes. Action = reaction.
Q 2:Describe a few examples in which the force of frictionexerted on an object is in the direction of motion of theobject.
Force of friction always apposes themotion.
Q 3:Consider a lamp hanging from a chain. What is the tension inthe chain?
Tension = weight of the lamp
Q 4:Does a speeding missile possess force?
Only if it is speeding and its speed is changing withtime. F=ma
Q 5:Why does a book sitting on a table never accelerate"spontaneously" in response to the trillions of inter-atomic forcesacting within it?
The sum of all forces acting on it is zero.
Q 6: Suppose we measure time by using hour glasses filled withsand. Discuss the various errors that would exist if we tried touse this as a world standard for time. Give a rough estimate forthe error over a 24 hour period.
A good answer s=was given athttp://en.allexperts.com/q/Physics-1358/plzzz-answer-soon.htm
"Obviously it would depend on how accurately one glassmeasured an hour. Any error would propagate throughout theday. Also, someone would have to be there at the exact timeto turn it, and just the act of turning would introduce a fractionof a second which would amount to several seconds over 24hours."
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