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# Assignment # 1 Physics (PHY101) solution

Question # 1

An anchor person reports that a new power plant inaugurated by Prime Minister will produce “60 megawatts per hour.” What’s wrong with this statement?                                               Marks = 4

Question # 2

A speeding car of terrorist overtakes a stationary Quick Response Force (QRF) car, which then heads after the speeder. The QRF car starts with zero velocity and is going at twice the car’s velocity when it catches up to the car. So at some intermediate instant the QRF car must be going at the same velocity as the speeding car. When is that instant?                                Marks 3+3 = 6

a)      Halfway between the times when the two cars coincide,

b)      Closer to the time when the speeder passes the stationary police car, or

c)      Closer to the time when the police car catches the speeder?

Note: Select the best choice given above (a to c) according to your best of knowledge, and also write the reason of your selected choice as well.

Question # 3

The 9-ball travelling to the right as shown above strikes the 13-ball, which is of equal mass and at rest. If this is an elastic collision, which statement below is true?                        Marks 3+4 = 7

a)      All of the 9-ball’s energy and momentum are transferred to the 13-ball.

b)      All of the 9-ball’s energy and some of its momentum are transferred to the 13-ball.

c)      Some of the 9-ball’s energy and all of its momentum are transferred to the 13-ball.

d)     In this collision, momentum is not conserved.

e)      In this collision energy, is not conserved.

Note: Select the best choice given above (a to e) according to your best of knowledge, and also write the reason of your selected choice as well.

Question # 4

The altitude of a rocket in the first half-minute of its ascent is given by x = ct2 where the constant c is 3m/s2 .Find a general expression for the rocket’s velocity as a function of time and from it the instantaneous velocity at t = 20s. Also find an expression for the average velocity, and compare your two velocity expressions.                                                                          Marks = 8

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### Replies to This Discussion

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

asgmnt ly looo g phy101 ki

Still no one here to discuss on the assignment....

we have to do something now?
plz come on now
we have to help each other

ye lo

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Q No 1 aur 2 koi hi koi bata do... baki baad main discuss ker lain gy bhi....

koi to jawab do  koi to solution batao wrna fail ho jay ge

phy101 ful solution ash kro or dua bhai k liye

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ye lo or dua do

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bhai jan ghlat h ap ki assign

question no # 2 to cmplt wong h

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