9 lobsters walk on the bottom of the sea its density should...

9. Lobsters walk on the bottom of the sea. Its density should be _____ than that of seawater. a. higher b. same c. less. 10. The volume of a certain object is 1 cubic meter. It is observed that it floats with 90% of its volume submerged under water. The mass of the object is ___________. 11. An object with a mass of 10 grams displaces 5 grams of water. We can say that the buoyant force on the object is: a) greater than your weight b) same as your weight c) less than its weight d) we cannot determine it from the information given.

Transcript

00:01 Hello students, we need to fill up this.

00:04 So we are given information according to a lobster walking on the seawater according to buoyant force, we need to complete it, complete it and rewrite it, right? to need to understand this, we need to understand first the concept of buoyant force, right? so let's start.

00:22 So here we can write variant force.

00:26 Biod force is the net upward force.

00:31 Net upward force on any object that is in the fluid in the water if i say in the water so if buoyant force is greater than if buoyant force is greater than if i write here greater than objects weight objects weight so if i write here the object will rise the object will rise to the surface and float right to the surface and float right now we are given lobsters walk on the bottom of sea its density should be so i answer would be higher than death of seawater because if i write here if i write here if an object is more dense means higher density more dense than water so this is the archimedes principle it will sank it will it will it will sank in water right and if and if less less dense than water.

02:10 It will float.

02:13 If i write here it will float.

02:17 What does that mean? it means that here lobster lobster walking on the bottom of the sea, right? so its density should be higher than of seawater because density is higher than it is not floating, it is sinking or it is in the bottom of sea.

02:35 So we can write here it density should be so answer is hence hence lobster density should be if i write here lobster density should be higher if i write here which is an option number a higher than death of c then death of c then that of c right and this is given in option number a right now let's come to next fill up so let's make it to a now in the b fill up we are asked that it is observed that lobstra is floating with 90 % so a object is floating with 90 % of its volume submerged underwater so mass of that object would be so we are writing here and volume of the object is one meter cube given.

03:44 It means this is the condition something like this.

03:47 This is our sea surface or water surface and an object is something like this, like this.

03:55 Suppose this is the object.

03:57 So basically object has 90 % volume under the water.

04:03 90 % volume under water and here what is acting biancy force.

04:08 And here what is acting here.

04:11 We it here.

04:12 Here.

04:12 Gravitational force is acting right so f of g is acting so if i write here and this is floating right so how it can be float it means force must be balanced so gravitational force is equal to yancy force right so let's let's suppose the mass of that object to be m so m g is gravitational force must be equal to must be equals to ync force and ync force is rau v.

04:45 Rau v, if i write here what is our yency force...

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