Question

17. A stone of mass 3 kg is kept at a height of 8m above the ground. Calculate P.E stored in it.(take g=10m/se
Section-
15. What are the isotopes? Write Isotopes of Hydrogen
16. Differentiate acute and chronic diseases. Give one example of each.
28
OR
State Universal law of gravitation. What is the value of universal gravitational constant?
18. Write chemical formulae of given compounds-Magnesium hydroxide, Calcium carbonate,Sodium nitrate.
Section-D
19. Derive expression for Kinetic Energy of a moving object. How K.E of an object changes if-
i. mass is halved
ii. Velocity is doubled.
20. An element is represented as 21X13.
Write its electronic configuration, no ofprotons, no.of electrons, no of neutrons.mass no atomic no..valency.Al
identify the element.
OR
8,3
2
State Postulates of Rutherford's atomic model. What was its drawback.
2 20kg
2,82
2 교​

Answer 1

Answer:

17. p.e = mgh

p.e.= 3*8*10

p.e.= 240N