You cast some metal of density p_m in a mold, but you are worried that there might be cavities within the casting. you measure the weight of the casting to be w, and the buoyant force when it is completely surrounded by water to be b. show that v_0=b/(p_water g) – w/(p_m g) is the total volume of any enclosed cavities. if your metal is copper, the casting's weight is 158 n, and the buoyant force is 22 n, what is the total volume of any enclosed cavities in your casting? express your answer using two significant figures. what fraction is this of the total volume of the casting? express your answer using two significant figures.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

a.   mass number from atomic number

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.