A 2 kW steel kettle of mass 1 kg contains 1.5 kg of water at 30°C. What is the time taken to boil the water, if the specific heat capacity of steel is 460 J kg-1°
C', and the specific heat capacity of water is
4200 J kg 1°C-1.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

Asystematic approach to problem solving is called a (an)

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?