An iron rod of length 50m and at a temperature of 80°c  is heated 90°c calculate it new length linear expansivity of iron is 1.2×10^-5k^-1

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

An object has a weight of 500 on earth what is the mass of this object

What happens to an isotope during radioactive decay?