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?

Which is not a source of electrical energy in the United States

A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 21 rad/s.

At what age is the human brain fully developed?

Two disadvantages of spreadsheet

Which best describes loudness? the subjective measurement of the intensity of sound the subjective measurement of the wavelength of a sound wave an inherent measurement of the intensity of sound an inherent measurement of the wavelength of a sound

How far into editing our human genes?

Which electromagnetic wave has the shortest wavelength? (A. Radio waves b. X-rays c. infrared rays or d. Visible light)

Which mixture can be separated based on differences in particle size of the components

What happens in an open circuit

When analyzing forces, it is allowable to break the motion and forces into horizontal and vertical components.