If a material, such as concrete, can withstand a large applied weight but gives away (ruptures) quickly when a crack forms, then it is considered

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?