The titanic weighed over 50,000 tonnes. Why did it not sink earlier?
If you have a helium balloon on a string in a car, and the car accelerates, what happens to the balloon?
Calculate the speed at which a coin will hit the floor when dropped from a certain height above the ground.
How would you weigh the Earth?
What is the area of your skin?
What safety mechanisms prevent a plane from being damaged by lightening?
Cows are one of the animals on the Earth. What is the percentage of water stored inside these cows out of water stored on whole earth?
We wrap a string around the earth once and add 1m of extra length to the string. If we use this string to lift the earth, what is the largest gap between the string the earth？ .