A building is 512 m high. What must be the minimum water pressure in a pipe at ground level in order to get water out of a tap in a restaurant on the top floor? Density of water is 1000 kg/m^3, assume the pressure on the top floor is 1 atmosphere (Patm=1.01 x 10^5 Pa). a. 5 x 10^6 Pa
b. 2 x 10^6 Pa
c. 1 x 10^6 Pa
d. 5 x 10^5 Pa
e. 1 x 10^5 Pa

A900 kg roller coaster car is travelling westward on the track and begins to slow down from 18m/s to 2m/s. how long does it take the roller coaster car to decelerate if the force acting on the car to slow it is 7024n? how far does the roller coaster travel during this time?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)