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Sneha Roychowdhury
Subject: Science
, asked on 7/3/18
The moon is stuck in orbit around the Earth .Comment.
Answer
2
Sapanpreet Singh
Subject: Science
, asked on 7/3/18
does the law of conservation of energy violate, when an object is allowed to fall freely from a certain height. justify.
Answer
1
Rakshak Iyer
Subject: Science
, asked on 6/3/18
Question 9
Answer
1
Monish
Subject: Science
, asked on 6/3/18
Dear Experts and Friends, can you please help me solve the given numerical:
Q.
A boy throws a ball vertically upwards and caches it back in 10 seconds. Calculate:
The velocity with which it was thrown up
Maximum height attained by the ball (g = 10 m/s
^{2}
)
Thank You !
Answer
1
Shreya.k
Subject: Science
, asked on 6/3/18
Q. If a body falls freely under the effect of gravity in air over the earth surface then
(A) Work done by gravity is positive (B) Work done by air frictional force is positive
(C) Work done by gravity is negative (D) Work done by air fictional force is negative
Answer
1
Rakshak Iyer
Subject: Science
, asked on 6/3/18
8. What is the work done in the situation shown below?
Answer
1
Harshit Singh Avengers
Subject: Science
, asked on 5/3/18
Answer the question urgent please. Answer my question tomorrow is my exam
26.
In the experiment to determine the density of a given solid (insoluble in water) by using a spring balance and a measuring cylinder, a student made the following observations.
mass of solid = 100g
initial reading of water in measuring cylinder = 50 ml
Final reading of water in measuring cylinder= 75 ml
calculate the density of a given solid on the basis of above observation.
Answer
1
Kirtan Dua
Subject: Science
, asked on 5/3/18
Solve this :
Q.
A student uses a spring balance of least count 0.5 gwt to measure minimum force requited to just move a wooden block on a surface. He holds the spring vertically and observes that the pointer of the spring balance is 3
^{rd}
division above the mark on the scale. He then pulled the block with this spring balance by increasing the pull gradually and when the pointer is at 38
^{th}
division, the block just starts moving. He calculates the force.
Its correct value will be:
(a) 38 gwt (b) 20.5 gwt
(c) 19.0 gwt (d) 17.5 gwt
Answer
1
Rishabh
Subject: Science
, asked on 5/3/18
Reply #fast
Q.13. Define relative density. The density of wooden block is 2000
$kg/{m}^{3}$
. Calculate its relative density.
Answer
1
Manan Vyas
Subject: Science
, asked on 1/3/18
can any one solve d whole sheet
Answer
1
Palak Jain
Subject: Science
, asked on 26/2/18
If gravitational force acts between all objects, why dont they move towards each other
Answer
1
Binay Tripathy
Subject: Science
, asked on 25/2/18
Pls answer this question
Q.16. (i) Will a sheet of paper fall slower than one that is crumpled into a ball in vacuum? Why?
(ii) Show mathematically that acceleration experienced by an object is independent of its mass.
(iii) Show that the value of g = 9.8 m/
${s}^{2}$
Given, G = 6.7
$\times {10}^{-11}N-{m}^{2}/k{g}^{2},M=6\times {10}^{24}kg,R=6.4\times {10}^{6}m$
Answer
1
Noufiya
Subject: Science
, asked on 24/2/18
(a) A cube of side 5 cm is immersed in water and then saturated salt solution. In which case will it experience a greater buoyant forces ? If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Given reason for each case.
$\left(b\right)Aballweighing4kgofdensity4000kg/{m}^{3}iscompletelyimmersedinwaterofdensity{10}^{3}kg/{m}^{3}.Findthebuoyantforceonit.\left(Giveng=10m/{s}^{2}\right)$
Answer
1
Noufiya
Subject: Science
, asked on 24/2/18
Please answer this
Give reasons :
(i) A piece of paper takes much longer to fall than a stone through the same distance.
(ii) The mass is constant everywhere whereas the weight keeps changing.
(iii) The value of 'g' keeps changing as we move away from the earth whereas value of 'G' remains constant all over the universe.
Answer
1
Noufiya
Subject: Science
, asked on 23/2/18
The volume of 100 g of a solid substance is 25 cm² and the density of water is 1g/cm³.
a) Find density of the substance.
b) Find the relative density of the substance.
c) Ravi finds his mass to be 42 kg on a weighing machine. Is his actual mass more or less than 42 kg? Give reason for your answer.
Answer
1
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Dear Experts and Friends, can you please help me solve the given numerical:

Q.A boy throws a ball vertically upwards and caches it back in 10 seconds. Calculate:The velocity with which it was thrown upMaximum height attained by the ball (g = 10 m/s^{2})Thank You !(A) Work done by gravity is positive (B) Work done by air frictional force is positive

(C) Work done by gravity is negative (D) Work done by air fictional force is negative

26.In the experiment to determine the density of a given solid (insoluble in water) by using a spring balance and a measuring cylinder, a student made the following observations.mass of solid = 100g

initial reading of water in measuring cylinder = 50 ml

Final reading of water in measuring cylinder= 75 ml

calculate the density of a given solid on the basis of above observation.

Q.A student uses a spring balance of least count 0.5 gwt to measure minimum force requited to just move a wooden block on a surface. He holds the spring vertically and observes that the pointer of the spring balance is 3^{rd}division above the mark on the scale. He then pulled the block with this spring balance by increasing the pull gradually and when the pointer is at 38^{th}division, the block just starts moving. He calculates the force.Its correct value will be:

(a) 38 gwt (b) 20.5 gwt

(c) 19.0 gwt (d) 17.5 gwt

Q.13. Define relative density. The density of wooden block is 2000 $kg/{m}^{3}$. Calculate its relative density.

Q.16. (i) Will a sheet of paper fall slower than one that is crumpled into a ball in vacuum? Why?

(ii) Show mathematically that acceleration experienced by an object is independent of its mass.

(iii) Show that the value of g = 9.8 m/${s}^{2}$

Given, G = 6.7$\times {10}^{-11}N-{m}^{2}/k{g}^{2},M=6\times {10}^{24}kg,R=6.4\times {10}^{6}m$

$\left(b\right)Aballweighing4kgofdensity4000kg/{m}^{3}iscompletelyimmersedinwaterofdensity{10}^{3}kg/{m}^{3}.Findthebuoyantforceonit.\left(Giveng=10m/{s}^{2}\right)$

Give reasons :(i) A piece of paper takes much longer to fall than a stone through the same distance.

(ii) The mass is constant everywhere whereas the weight keeps changing.

(iii) The value of 'g' keeps changing as we move away from the earth whereas value of 'G' remains constant all over the universe.

The volume of 100 g of a solid substance is 25 cm² and the density of water is 1g/cm³.a) Find density of the substance.

b) Find the relative density of the substance.

c) Ravi finds his mass to be 42 kg on a weighing machine. Is his actual mass more or less than 42 kg? Give reason for your answer.