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Syllabus

Pls

1 The force to be applied on the block moves down without acceleration is ?

a) 10N

b) 15N

c) 5N

d) 20N

2 The ratio of powers needed in the above two cases if the speed of block is same in both cases is ?

a) 1:1

b) 1:2

c) 1:5

d) 2:1

Answer should be : 14m/s

that at half depth where the water barometer reads 10

m. The depth of the lake is:

(a) 15 m (b) infinite

(c) 20 m (d) 10 m

Show that 1Ns/m

^{2}=10 poisewhy does frictional force increase when two surfaces in contact are polished beyond a certain limit?

32. A mass 'M' is connected to a rope of length l and , on which an external force 'F, what is the tension force at A?

33. In the above question, what is the tension force at mid-point of the rope?

34. In the above question what is the acceleration of mass M?

1 kg at rest. After the collision the speed of the lighter ball is 1) zero. 2) less than 10 m/s. 3) equal to 10 m/s. 4) greater than 10 m/s.

1) x1/x2= -m1/m2

2) x1/x2= -m2/m1

3) x1/x2= [m1/m2]^2

4) x1/x2=[m2/m1]^2

Answer with Explain it !!

(a) sigma/sigma-1

(b)sigma+1/sigma

(c){sigma/sigma-1}^1/3

(d){sigma+1/sigma}^1/3

(iii) part

a= 256 m/s^2.

It asks acc? But which tangential or radial or angular...

Pls ans asap.

It requires integratiin i guess...butbi am unable.

Ans: 100

Ans:B. Itried makijg out a square with side l but that gave me the ans as ml^2/3

Q.9. A barometer kept in an elevator reads 76 cm when is at rest. If the elevator goes up with some acceleration, the reading will be

(1) 76 cm

(2) > 76 cm

(3) < 76 cm

(4) Zero

Q2. A block of mass 5 kg is sliding down a rough inclined plane of inclination 37° or sin

^{–1}(0.6) to the horizontal and coefficient of Kinetic Friction $\mathrm{\mu}$ = 0.5. If it started from rest at time t = 0 then at time t = 10 sec, the instantaneous Power developed by the Gravitational force and the frictional force are respectively, (g = 10 m/s^{2})(1) 500 watts and – 400 watts

(2) 300 watts and –200 watts

(3) 600 watts and –300 watts

(4) 600 watts and – 400 watts

Q. A rope lies on a table such that a part of it hangs down the table. When the length of hanging is 1/3 Of entire length the rope just begins to slide The coefficient of friction between the rope an

the table is :

(1) 2/3

(2) 1/2

(3) 1/3

(4) 1/6