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Aditya Kumar
Subject: Science
, asked on 26/2/18
Q. If three coplanar forces acting at origin are in equilibrium then which is correct:
$A.{F}_{1}-{F}_{2}=\frac{{F}_{3}}{\sqrt{2}}\phantom{\rule{0ex}{0ex}}B.{F}_{1}-{F}_{2}=\sqrt{\frac{2}{3}}{F}_{3}\phantom{\rule{0ex}{0ex}}C.{F}_{1}+{F}_{3}=\sqrt{2}{F}_{2}\phantom{\rule{0ex}{0ex}}D.{F}_{1}-{F}_{3}=\frac{2}{\sqrt{3}}{F}_{2}$
Answer
1
Harsh Sethi
Subject: Science
, asked on 25/2/18
$Q.Acons\mathrm{tan}tforceactsonanobjectofmass5Kgforadurationof2s.Itincreasestheobject\text{'}svelocityfrom3m/sto7m/s.Findthemagnitudeofforceapplied.Now,ifthewasappliedforadurationof5s,whatwouldbethefinalvelocityoftheobject?$
Answer
1
Ebin Joe
Subject: Science
, asked on 19/2/18
Give reason: When a ball is dropped from a height, its speed continously increased.
Answer
2
Sahil.....
Subject: Science
, asked on 17/2/18
a batsman hits a ball with a force of 50n.before the ball was hit it was travelling at a speed of 20m/s.after it was hit it started travelling at a speed of 16m/s in the opposite direction.the mass of the ball is 0.3kg. for how much time was the ball im=n contact with the bat?
Answer
3
Mansi
Subject: Science
, asked on 17/2/18
Plz solve this ques .
Q.3. A stone dropped from a window reaches the ground in 0.5 sec. Calculate the speed just before it hits the ground. What is the average speed of the stone. Calculate the height of window from the ground. G = 10
$m/{s}^{2}$
.
Answer
3
Mansi
Subject: Science
, asked on 17/2/18
1) A man throws a ball of mass 0.5 kg vertically upwards with velocity of 25 m/s. Find the initial momentum of a ball at the half way mark of the maximum height. g = 10 m/s.
Answer
3
Anushka Mishra
Subject: Science
, asked on 15/2/18
$48.IfF,{F}_{N}andfdenotesthemagnitudeofthecon\mathrm{ta}ctforce,normalforceandthefrictionalforce\phantom{\rule{0ex}{0ex}}exertedbyaobjectplacedontheothersurfaceincontact.\xcdfF=5N,{F}_{N}=20Nandf=2N,\phantom{\rule{0ex}{0ex}}thenthebodywill\phantom{\rule{0ex}{0ex}}\left(a\right)moveinforwarddirection\left(b\right)moveinbackwarddirection\phantom{\rule{0ex}{0ex}}\left(c\right)beinthestateofrest\left(d\right)both\left(a\right)and\left(b\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}49.IfF,{F}_{N}andfdenotethemagnitudeofthecontactforce,normalforceandthefrictionalforce\phantom{\rule{0ex}{0ex}}exertedbyaobjectplacedontheroughhorizontalsurfaceincontact.IfF=2N,{F}_{N}=20Nandf=5N,\phantom{\rule{0ex}{0ex}}thenthebodywill\phantom{\rule{0ex}{0ex}}\left(a\right)moveinforwarddirection\left(b\right)moveinbackwarddirection\phantom{\rule{0ex}{0ex}}\left(c\right)beinthestateofrest\left(d\right)both\left(a\right)and\left(b\right)$
Answer
2
Anjana Vura
Subject: Science
, asked on 14/2/18
Derive first law of newton from second law of motion
Answer
1
Admya Maini
Subject: Science
, asked on 12/2/18
why unstable equilibrium has high potential energy ?
Answer
1
Ronit Narang
Subject: Science
, asked on 5/2/18
Q1.Water sprinkler used for grass lawns begins to rotate as soon as the water is supplied.Explain the principle on which it works.
Q2.An iron sphere of mass 1Kg is dropped from the height of 10m.If the acceleration of sphere is 9.8m/s square.Calculate the momentum transferred to the ground by the ball.
Answer
1
Vagmi
Subject: Science
, asked on 3/2/18
What is force f and component of force in the direction of displacement F;?
(A) F < F' (B) F > F' (C) F ≤ F' (D) F = F'
Answer
2
Maitreyie Tomar
Subject: Science
, asked on 2/2/18
What are the properties of force?I only know that there are 3 properties of force.
Answer
2
Sneha Maity
Subject: Science
, asked on 1/2/18
Please answer
48. Which of the following statements is
not correct
about a planet rotating around the Sun in an elliptical orbit?
(A) Its kinetic energy is constant.
(B) Its angular momentum is constant.
(C) Its areal velocity is constant.
(D) Its time period is proportional to r
^{3}
.
Answer
1
Maitreyie Tomar
Subject: Science
, asked on 1/2/18
Please explain the mathematical formulation of 2nd law of motion.The right hand side picture is 1pic and left hand side pic is 2nd pic.
Answer
1
Maitreyie Tomar
Subject: Science
, asked on 31/1/18
Sorrry for inconvience but sir if you check there is another pic.If you cannot find please tell me i will send the pic again.
Answer
1
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Q. If three coplanar forces acting at origin are in equilibrium then which is correct:

$A.{F}_{1}-{F}_{2}=\frac{{F}_{3}}{\sqrt{2}}\phantom{\rule{0ex}{0ex}}B.{F}_{1}-{F}_{2}=\sqrt{\frac{2}{3}}{F}_{3}\phantom{\rule{0ex}{0ex}}C.{F}_{1}+{F}_{3}=\sqrt{2}{F}_{2}\phantom{\rule{0ex}{0ex}}D.{F}_{1}-{F}_{3}=\frac{2}{\sqrt{3}}{F}_{2}$

Q.3. A stone dropped from a window reaches the ground in 0.5 sec. Calculate the speed just before it hits the ground. What is the average speed of the stone. Calculate the height of window from the ground. G = 10 $m/{s}^{2}$.

Q2.An iron sphere of mass 1Kg is dropped from the height of 10m.If the acceleration of sphere is 9.8m/s square.Calculate the momentum transferred to the ground by the ball.

(A) F < F' (B) F > F' (C) F ≤ F' (D) F = F'

48. Which of the following statements isnot correctabout a planet rotating around the Sun in an elliptical orbit?(A) Its kinetic energy is constant.

(B) Its angular momentum is constant.

(C) Its areal velocity is constant.

(D) Its time period is proportional to r

^{3}.