Diversity In Living Organisms — Science STD 9 — Question

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

A motorcyclist starts from rest and reaches a speed of 6m/s after travelling with uniform acceleration for 3s. What is his acceleration?

Describe the term ‘inertia’ with respect to motion.

Read the statement given below:
Cells are active with dense cytoplasm and prominent nuclei.

Describe Thomson’s model of the atom. Which subatomic particle was not present in Thomson’s model of the atom?

An electric heater uses 600kJ of electrical energy in 5 minutes. Calculate its power rating.

What is the necessity of using term 'Average Power instead of power'?

A boy gets into a floating boat.

1. What happens to the boat?
2. What happens to the weight of water displaced?
3. What happens to the buoyant force on the boat?

Which organelles constitutes the network of complex cellular membrane system in living cells?