Physics 11 Circular Motion Important Question

What is difference between angular acceleration and centripetal force? How moment of inertia is related to torque? An elevator starts up from the basement with initial acceleration of 16m/sec² will the passenger's apparent

Bwl-17

Sgd-16

weight be increased, decreased or remain same. An elevator moving down when suddenly the chain of the elevator breaks. Two different bodies appear to

Lhr-17

having the same weight. What is the real weight and why?

SECTION II

ot any 3 (three) questions.

Mul-16

Explain the angular momentum? Differentiate between spin angular momentum and orbital angular momentum? Explain law of conservation of angular momentum (5) What is least speed at speed at which an aero plane can execute a vertical loop of 1.0km radius so that there is

no tendency for the pilot to fall down at the highest point?

Dgk-15,17, Lhr-16, Bwl-16, Guj-18 What do you mean by instantaneous angular acceleration? Calculate centripetal force. (5) Radio and TV signals bounce from a synchronous satellite. This satellite circles the Earth once in 24 hours. So if the satellite circles eastward above the equator, it stays over the same spot on the Earth because the Earth is rotating at the same rate.

What is the orbital radius for a synchronous satellite? (b) What is its speed?

(3)

What is difference between real weight and apparent weight? Discuss different cases for apparent weight with respect to motion. (5) The Earth rotates on its axis once a day. Suppose, by some process the Earth contracts so that its radius is only half as large as at present. How fast will It be rotating then? (For sphere 1= 2/5 MR2). (3)

Dgk-14

Define rotational KE? Find rotational KE for disc and hoop. Guj-17, Lhr-16,17, Dgk-16, Mul-16, Fsd-15,18, Rwl-15 An electric fan rotating at 3 rev s¹ is switched off. It comes to rest in 18.0 s. Assuming deceleration to be uniform, find its value. How many revolutions did it turn before coming to rest?

 What are geo stationary satellites? Derive an expression for the orbital radius of geostationary satellite? A 1000 kg car is turning around a corner at 10 ms-1 as it travels along an arc of a circle. If the radius of the circular path is 10 m, how large a force must be exerted by the pavement on the tyres to hold the car in the circular path?