Will an object with a density of 1.05 g/ml sink or float in water

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Which feature of a heating curve indicates a change ofn state

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane