What is the focal length of the lens

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1. The mass of gas emitted from the rear of toy rocket is initially 0.2 kg/s. If the speed of the gas relative to the rocket is 40m/s, and the mass of rocket is 4 kg, what is the initial acceleration of the rocket?

2. A string supports a solid iron object of mass 200 gm totally immersed in a liquid of density 800 kg/m3 the density of iron is 8000 kg/m, Calculate the tension in the string.

3. An object is dropped from the top of the tower of height 156.8m. and at the same time another object is thrown vertically upward with the velocity of 78.1 m/s from the foot of the tower , when and where the object meet? (2s, 20m from top)

4. A constant torque of 200Nm turns a wheel about its centre. The moment of inertia about this axis is 100 kg/m2, Find the K gained after 20 revolutions.

5. How much heat is required to convert 10 gm of ice at -10oC into steam at 100oC (specific heat capacity of ice is 0.5 cal/gm.C).

6. An aluminium rod when measured with steel scale, both being at 25, appears to be Im long, If the scale is correct at 0.C, what will be the length of the rod at 0°C? (linear excansivity of aluminium 26 x 104/K and steel. 1.2 x 104/K) (0.9996)

7. A glass flask of volume 400 cm, is just tilled with mere, at O.C. limy much mercury overflows when the temperature of the system is raised 80, The coefficient of cubical expansion of the glass is 1.2 x 104 and that of mercury is 18 x 104.C. (0.000002,)

8. A conversing lens of 5 cm focal length used as a simple magnifier, produces a virtual image 25 cm from the eye. How far from the lens should the object be placed? What is the magnification?

9. The radii of curvature of the faces of a thin conversing meniscus lens of RI 1.5 arc 15 cm and 30 cm. what is the focal length of the lens when it is completely immersed in water of RI 4/3?

10. In the given capacitors circuit what is the equivalent capacitance between a and b, C1 = C5 = 8.4μ F and C2 = C2 = C4 = 4.2 μF and (2.52pF)

Reference no: EM13705656

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