A37 g ice cube at -39°c is placed in a lake whose temperature is 35°c. calculate the change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake. the specific heat of ice is 2220 j/kg·k. (hint: will the ice cube affect the temperature of the lake? )

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 ?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant