If an ice cube melts in water, why does the water level stay the same?
Essentially this works due to the ice pushing the water level up even when it is in solid form. Ice cubes left in water and allowed to float will be 93 percent or so submerged, which is equal to its density divided by the density of water. Since the cube is 93 percent submerged, it raises the level of water by 93 percent of its volume divided by the area. After the ice cubes melt, they turn into water, but the water they turn into is only 93 percent as voluminous because water is less dense than ice. Thus, the water added to the container due to the ice melting happens to be 93 percent of the full ice cube’s volume. Since this is the exact same amount of volume added when the ice cube is floating, the two water levels will naturally be the same.
A steel ball floats in a beaker containing mercury. What would happen if water is poured into the beaker?
Before we pour the water, the steel ball flots on the surface of mercury. The ball is in air medium. This is obvious as density of steel is fairly less than that of mercury.Now, when water is poured to the extent that ball entirely remains in water medium, the effective density of steel ball decreases. But, density of water is not that large to make any appreciable change.In all the answers so far no body has considered the effect of surface tension of mercury. The small portion of surface of the ball is in contact with surface of mercury . At this portion mercury surface is slightly curved inside. This will develop resultant surface tension force in the upward direction. So,this force is also responsible, along with buoyancy force for the floating of the ball.
What should you do when you drop your phone in water?
Yesterday my mobile (Moto G2 ) fell into full bucket of hot water. This question aroused after this happened to me and now I’m writing this answer through my mobile only! (which is working in same condition it was before ) . so how did happened !!. So ,if your mobile fall into water , first thing first , immediately switch it off .if you can take its battery out, so do so ,otherwise in my case , I wasn’t able to take the battery out so switch it off immediately as the water penetrated into the phone can short-circuit the component if the phone is on and current is flowing inside it .now place your phone into a drying agent , the most common drying agent (soaking agent ) available with all of us is dry rice or uncooked rice . place your mobile covered into rice for 24 or more hours as dry rice are good absorbing agents as they absorb whatever moisture left inside your phone . You can also use silica gel to dry your phone .Precaution - never blow dry your phone with blow dryer or heater as they can fry components of your phone . Don’t do such silly mistake .After 24 or more Hrs you can switch on your phone and I’am definitely sure you can use your phone as it was before .Why your phone is not working after all this - this is because your phone was in water for more time ,this let the water penetrated deep into the phone; it was not possible to absorb the moisture after all this remedy also.What should you do even if your phone is not working now also - immediately rush to the nearest mobile service store :)#underoot41
A force of 100 N is acted on a block with a of mass 50 kg and produces a constant velocity of 5 m/min on a rough surface. Can you find the force of friction?
It is a very interesting real fact that Force has a value if and only if the force applied on any body is moving with an acceleration i.e the velocity should get increasing. If not Force is simply Zero.Force = Mass X AccelerationIf Velocity is constant or not changing, then Acceleration is absolute 0Resulting Force = Zero.In this case, when the Applied force 100 N was acted on the box, initially the Net force had a value until the box accelerated to 5 m/min (motion) from 0 m/min (rest). Once the box attained the velocity of 5 m/min and became constant, the Net force became Zero.So, Net Force = Applied Force - Frictional ForceAs per above Explanation Net Force becomes 0 as the velocity becomes constant.0 = Applied Force - Frictional ForceApplied Force = Frictional Force = 100 N (Answer)