1a. 4. A man pulls a sled along a rough horizontal surface byapplying a constant

Question

1a. 4. A man pulls a sled along a rough horizontal surface byapplying a constant force F at an angle A abovethe horizontal. In pulling the sled a horizontal distance d, thework done by the man is: Fd*cos A
Fd*sin A
Fd/cos A
Fd/sin A
Fd 1b. . If a certain car, going with speed v1, rounds a level curvewith a radius R1, it is just on the verge of skidding. If its speedis now doubled, the radius of the tightest curve on the same roadthat it can round without skidding is: R1/4
4R1
2R1
R1/2
R1 1c. If a satellite moves above Earth?s atmosphere in a circularorbit with constant speed, then: the net force on itis zero
its acceleration istoward the Earth
its velocity isconstant
its accelerationand velocity are always in the same direction
it will fall backto Earth when its fuel is used up Pls kindly explain ur answers. Thanks!

Explanation / Answer

Q1)     work done = f S cos =Fd CosA Q2)    centripetalforce = frictionalforce            mv 2 / r = m g                   v2 r          If velocity is doubled, then radius becomes 4 timesi.e 4 R1 Q3) It require centripetal force for rotation. Hence,it's acceleration is always towards the Earth          Moreover itwill fall back to earth when its fuel is used up

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