Which of these is likely to happen in the absence of the stratosphere? We may have to bear the impact of a meteorite.
We may not experience storms, winds, and clouds.
Mixing of air due to convection currents may stop.
Increased exposure to radiation may cause skin ailments.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Atoms containing radioactive nuclei are called