The specific heat capacity of aluminium is 0.9 KJ/Kg°C How much energy will it take to raise the temperature of 1 Kg of aluminium by 1°C?

Aplane's average speed between two cities is 600 km/h. if the trip takes 2.5 hours, how far does the plane fly?

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)

Derive the lens makers formula for convex les?