Q24.  A hot lead ball, mass = 0.30 kg, is dropped into an id…

Q24.  A hot lead ball, mass = 0.30 kg, is dropped into an ideal calorimeter (no heat lost to the surroundings) containing 0.50 kg of water initially at 20.0 °C.  The final equilibrium temperature of the lead ball and the water is 21.3 °C.  Find the initial temperature of the lead ball.  The specific heat capacity of lead is 128 J/(kg·C°); and the specific heat capacity of water is 4186 J/(kg·C°).

Q25 & 26.  A golf ball (I = 2/5 mr2), starting from rest, ro…

Q25 & 26.  A golf ball (I = 2/5 mr2), starting from rest, rolls down the ramp as shown (assume no energy loss to friction).  At the end of the ramp at point A, the ball becomes airborne, leaving at an angle of 35° with respect to the ground. Q25:  Find the speed of the ball when it becomes airborne. Q26:  Find the horizontal range of the ball.