A6 kg object falls 10 m. the object is attached mechanically to a paddle-wheel which rotates as the object falls. the paddle-wheel is immersed in 600 g of water at 15°c. what is the maximum temperature that the water could be increased to? is this a very efficient way of heating water? the specific heat of water is 4.186 j/(g* ˚c).

Explanation:

Given

Mass of object (m)=6 kg

falling height(h)=10 m

mass of water()=600 gm

temperature of water =15

specific heat of water

Let T be the Final Temperature of water

Here Object Potential Energy is converted into Heat energy which will be absorbed by water

Potential Energy(P.E.)

Heat supplied

T-16=0.234

This is not an efficient way of heating water as there is onlyincrease in temperature.

1 the 4 is sig

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.