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1.The length of of a seconds hand in a watch is 1cm.The change in velocity of its tip in 15s is what? 2.A particle is projected vertically upwards and reaches the maxm. ht. H in time T.The ht. of a particle at any time t will be what?

1.The length of of a seconds hand in a watch is 1cm.The change in velocity of its tip in 15s is what?


2.A particle is projected vertically upwards and reaches the maxm. ht. H in time T.The ht. of a particle at any time t will be what?

Grade:Upto college level

5 Answers

Badiuddin askIITians.ismu Expert
148 Points
11 years ago

Dear Chandan Das

speed of tip of second hand is constant =2∏*1/60  cm/sec

                                                         =∏/30  cm/sec

so in 15 sec it will rotate by an angel 90 degree

initial velocity = ∏/30 i

final velocity = ∏/30(-j)

change in velocity = | ∏/30(-j)  - ∏/30 i|

                          =∏√2/30  cm/sec


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Nehal Wani
21 Points
11 years ago
Ans 2: Max Height: u^2sin^?/2g = H usin?/g = T Displacement at any time t = xtan?-(1/2)gx^2/(u^2cos^2?) Replace x with ucos?t : utsin?-(1/2)gt^2 =2Ht/T-(1/2)gt^2
Nehal Wani
21 Points
11 years ago

Max Height Attained : H = (u2sin2θ)/2g      ½

 

Time Taken For Achieving Max. Height : T = usinθ/g

Displacement At Any time t: xtanθ-½gx2/(u2cos2θ)

Replace x with ucosθt : utsinθ-½gt2

= 2Ht/T-½gt2

 

Meera
17 Points
4 years ago
What is the answer jjfhhvhkbdriknbvfdtuinnnbbnnhnnnfdchjnnmnnbvfgghjkkkjjfhhvhkbdriknbvfdtuinnnbbnnnkyhjnnnnkkkkkrkknbvfgghjkkk and zoology notes and put
ankit singh
askIITians Faculty 614 Points
one year ago
The hand moves 360 degrees in 60 seconds. So in 15 seconds it moves 90 degrees. The tip of the hand is moving around the circumference of the circle with radius 1cm = 2pi cm. It does this in 60 seconds so its speed is: 2 x pi x r / 60 cm per seconds = 0.105 cm per second.

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