It takes the elevator in a skyscraper 4.5s to reach its cruising speed of 11m/s . a 70kg passenger gets aboard on the ground floor.
a- what is the passenger's weight before the elevator starts moving?
b-what is the passenger's weight while the elevator is speeding up?
c-what is the passenger's weight after the elevator reaches its cruising speed?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons