Draco decides to hide Doyle's 17.64 N Potions textbook. He pushes it leftward to compress a 15 N/m spring 0.7 m. When he releases it, the book flies 7 m across the smooth 1.9 m high desk. If there is a pile of clothes 6.5 m away from the base of the desk, will the book land and get lost amongst the clothes or will Draco's prank fail?

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

prndulum needs thread, weight clock to time swings

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.