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SPEED. http://en.wikipedia.org/wiki/Speed. What is the best unit to measure the speed of a snail?. a) km/h b) m/min c) m/s d) mm/s. A snail crawls 1 mm/s. What is the best unit to measure the speed of a racing car?. a) km/h b) m/h c) mm/min d) cm/s. At Bahrain,
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SPEED http://en.wikipedia.org/wiki/Speed
What is the best unit to measure the speed of a snail? a) km/hb) m/min c) m/s d) mm/s
What is the best unit to measure the speed of a racing car? a) km/hb) m/h c) mm/min d) cm/s
At Bahrain, formula one racing cars travel at an average speed of 205 km/h
a) km/minb) m/s c) m/min d) cm/s What is the best unit to measure the speed of a 100 m runner?
What is the best unit to measure the speed of the space shuttle? a) km/hb) mm/s c) m/h d) cm/s
What is heavier? The bamboo bowl or the rock? A large piece of bamboo is heavier than a small piece of rock
What is heavier: rock or bamboo? DENSITY Throw in water
What is heavier: rock or bamboo? DENSITY Bamboo floats Rock sinks
Compare the same amount of bamboo and rock At 4°C pure water has a density (weight or mass) of about 1 g/cm3 What is the density of rock? 3 g/cm3 What is the density of bamboo? Rock sinks in water Bamboo floats 0.4 g/cm3
http://www.iem-inc.com/tooldens.html DENSITIES Copy down 5 densities of materials you find interesting
Air Apple Beeswax Bone Brick Butter Glass Concrete Diamond Petrol Pure gold Ice Iron Ivory Leather 0.001205 0.64 0.961 1.7 2.4 0.86 2.6 2.4 3 – 3.5 0.72 19.3 0.92 7.9 1.8 – 1.9 0.946 DENSITIES Which of these will float in water?
357 g/L How much salt can you add to a liter of cold water and dissolve easily? How much salt can you add to a liter of boiling water and dissolve easily? 390 g/L in boiling water
35 g/L What is the concentration of salt in the Dead Sea? What is the concentration of salt in oceans? 315 g/L
How much sugar do I put in tea? 1 teaspoon per cup 5 g/50 ml
ENERGY calories Joules 4.2 Joules = 1 calorie
http://www.freedieting.com/tools/calorie_calculator.htm 2000 Cal/day
km/h DENSITY g/cm3 g/L CONCENTRATION SPEED ENERGY Cal/g
distance/time DENSITY Usually solids mass/volume of a mass or liquid in a liquid mass/volume CONCENTRATION SPEED ENERGY calories/mass
(a) g/cm3 (b) g/L The energy gained by eating chocolate is measured by (c) km/h (d) Cal/g
(a) g/cm3 (b) mL/s The density of petrol is measured by (c) km/h (d) Cal/g
The concentration of sugar in coffee is measured by (a) g/cm (c) km/h (b) g/mL (d) Cal/g
The speed of a leopard can be measured in (a) g/cm3 (c) km/h (b) g/mL (d) Cal/g
a leopard’s top speed is 114 km/h
The density of a human being can be measured in (a) g/cm3 (c) km/h (b) g/mL (d) Cal/g
The average density of a human being is 1.01 g/cm3 At 4°C pure water has a density (weight or mass) of about 1 g/cm3 SINK
The concentration of an anti-biotic can be measured in (a) mL/g (c) km/h (b) g/mL (d) Cal/g
The energy in pasta is measured in (a) g/cm3 (c) km/h (b) g/mL (d) Cal/g
The energy in pasta is 1.06 cal/g A serving of 250 g contains 265 calories.
roughly 1cal/g PASTA A serving of 250 g contains 265 calories. Source: http://www.quitehealthy.com/nutrition-facts/food-labels/label225731.gif