A rock is suspended from a scale reads 20.0 N. A beaker of water (having a density of 1000 kg/m3) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock? A) 3.00 × 103 kg/m3 B) 1.60 × 103 kg/m3 C) 2.67 × 103 kg/m3 D) 2.50 × 103 kg/m3 E) 2.33 × 103 kg/m3

A 0.50 kg frog sits on a 0.20 kg ball floating in water with exactly half its volume submerged.  The volume of the beach ball is ____ m3 (note units).

A plastic block of mass m is floating on the water's surface. Some of the block is under the water and some is above. The block is exactly 4cm thick and 2.8cm beneath the surface of the water.   If the density of the water is given as pw = 1000kg/m^3, calculate the density of the plastic block.

A block of wood has a mass of 3.71 kg and a density of 515 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m3) so that it will float in water with 0.803 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the bottom of the wood? (a) Number Type your answer for part (a) here Units Choose your answer for part (a) here                                                            (b) Number Type your answer for part (b) here Units Choose your answer for part (b) here

A scale reads 100 N when a piece of aluminum is hanging from it. What does it read when it is lowered so that the aluminum is submerged in water? The mass density of aluminum is 2700 kg/m^3. Be careful, you are given mass density instead of weight density, and we are using SI units.i need answer in problem sigfig

A block of wood has a mass of 3.81 kg and a density of 684 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m³) so that it will float in water with 0.851 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the bottom of the wood? (a) Number Units (b) Number i Units

A block of wood has a mass of 3.71 kg and a density of 515 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m3) so that it will float in water with 0.803 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the bottom of the wood?