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Questions in physics

[Open]The milk froth is white and contains lots of air bubbles. Suggest why the Cappuccino coffee cools down more slowly than the Americano coffee.

[Open]A 20 N stone rests on a table. What is the force the table exerts on the stone, and in what direction?

[Open]It is estimated that light takes 10,000 years to travel the full distance across our galaxy. If light travels at [tex]3.0 \times 10^8 \, \text{m/s}[/tex], then what is the distance across the Milky Way? Give your answer in standard form.

[Open]Convert 1,000,000 to scientific notation.

[Open]In reaching her destination, a backpacker walks with an average velocity of 1.22 m/s due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.53 m/s due west, turns around, and hikes with an average velocity of 0.445 m/s due east. How far east did she walk?

[Open]A boat is rowed at 8 km/hr directly across a river that flows at 6 km/hr. What is the resultant speed?

[Open]Why can we see objects in space, such as the Sun, stars, the Moon, and other planets?

[Open]If ice has a density of [tex]0.92 \, \text{g/cm}^3[/tex], what is the volume of [tex]1.8 \, \text{kilograms}[/tex] of ice?

[Open]An airplane cruises at 880 km/h relative to the air. It is flying from Denver, Colorado, due west to Reno, Nevada, a distance of 1200 km, and will then return. There is a steady 90 km/h wind blowing to the east. What is the difference in flight time between the two legs?

[Open]Why is wheat flour usually passed near a magnet before being packed?