420 kJ heat is released when 2 kg of water is cooled from 70 ° C. What is the
final temperature of water? (specific heat
capacity of water = 4.2 x 103 J kg-1 °c")​

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory