Question

class 11

1. State the following (1 mark each)

Law of orbits

Law of areas

Law of periods


2. What is escape speed and orbital speed? (2mark)


3. Give two applications of artificial satellites. (2 mark)


4. Explain the state of weightlessness of a body. (2 mark)


5. Derive the relation between Gravitational constant and acceleration due to gravity. (3mark)


6. State and explain Newton’s universal law of Gravitation. (3 mark)


7. Obtain the expression for escape speed. (5 mark)


8. Derive the expression for acceleration due to gravity at a point above the surface of the earth.

(5 mark)​

Answer 1

Answer:

In a closed-coil helical spring the diameter of each coil is to be 10 times that od the wire of the spring and the maximum shear stress is not to exceed 60 N/mm Maximum permissible deflection under a load of 400 N is 100 mm. Taking the shear modulus as 9x10'4 N/mm determine the number of coils, the diameter of the coil and energy stored in the coil.