A paper weight is dropped from the roof of a block of multi storey flats. each storey being 3 metre high. it passes the ceiling of the 20th storey at 30m/s. if g=10m/s2, how many storeys does the flat have?

Elevation above sea level is called

A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark. It does this in 3 seconds. What is the speed? What is the velocity? (Define increasing numbers to be the positive direction and decreasing numbers to be the negative direction.

Compute the resistance in ohms of a copper block 5.0 cm long and 0.10 cm2 in cross-sectional area. (ρ = 1.77 * 10-6 ohm-cm)

List 3 indicators that a chemical reaction has occurred.

What can turn a natural hazard into a natural disaster?

Burning involves a chemical change. true or false

What is the fate of the universe knowing that heat flow from hot to cold until there is equilibrium of temperature?

Limestone chips dissolve after they are placed in a beaker of dilute acid. Which geologic process is this most similar to?

In air an object weighs 15N. when immersed in water it weighs 12N. when immersed in another liquid it weighs 13N. determine the density of d object and that of d other liquid

You wash the dishes. when you let the water down the drain, where is the water flowing the fastest?