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What force stops a plate falling through the table? A periscope is an instrument for observation over around or through an obstacle. explain how light travels in a periscope. diagram the light rays as these pass through the periscope.? What is 49 kg in lb? Can an object traveling at constant velocity have acceleration why? How much is the refractive angle when total internal reflection occurs? Do lakes have tides, and if so, how do they compare to ocean tides? What happens when air uplifts rapidly causing electrical charges to form? What is a wheelbarrow example of what type of lever? Why is air a good insulator if it cannot move? What is the difference between precision and accuracy? How many ton are in 1100 liter of cardboard? How is Homi J bhabha related to nuclear power plant? What is the bulk modulus of water at a temperature of degree Celsius where the speed of sound in water is metre per second and the density of water is 1000 kilogram per metre cube? When does a bowling ball have potential energy? Effect on amplitude with increase in tension on string? What 72.9kg in stones? What type of energy makes it possible for us to see the world around us? How do you know when you are orgasming? All waves need a medium to travel? What are the energy transfers of the six simple machines for example an incline plane is gravitational potential energy to mechanical energy. I want to know what are the other fives and for levers I would like to know class one and class 2?