How much energy must be added to a 1 kg piece of glass with a specific heat of 644 J/kgC to increase its temperature from 20 c to 100c

Describe uniform velocity and variable velocity in short

What are the north and south poles of a solenoid change with?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.