Subject: Physics, asked on 14/5/18

Ques no 8 plzz

Subject: Physics, asked on 14/5/18

Fast please 7.  A spherical mass is scooped out from a solid of radius R. The distance between the cavity and centre of sphere is x. The gravitatvonal field inside the cavity is (A) zero (B) uniform in direction and constant in magnitude (C) non-uniform (D) uniform in direction and variable in magnitude

Subject: Physics, asked on 14/5/18

Solve this: 4.  A system consists of n identical particles of mass m placed rigidly on the vertices of a regular polygon with each side of length a. If K1 be the kinetic energy imparted to one of the particles so that it just escapes the gravitational pull of the system and thereafter kinetic energy K2 is given to the adjacent particle to escape, then the difference  is

Subject: Physics, asked on 14/5/18

Solve this: 1.  A solid sphere of uniform density and radius R applies a gravitational force of attraction equal to F1 on a particle placed at a distance 2R from the centre of the sphere. A spherical cavity of radius R/2 is now made in the sphere as shown in the figure The sphere with cavity now applies a gravitational force F2 on the same particle. The ratio F2/F1 is (A) 5/9                                               (B) 7/8 (C) 3/4                                               (D) 7/9

Subject: Physics, asked on 13/5/18

My answer is coming 4 . but answer given is 2. Plz explain! Q. Find the ratio of the kinetic energy required to be given to the satellite to escape earth's gravitational field to the KE required to be given so that the satellite moves in a circular orbit just above earth's atmosphere.

Subject: Physics, asked on 13/5/18
Subject: Physics, asked on 11/5/18

Solve this: Q.6. The ratio of KE of a planet at the point 1 and 2 is : (A) ${\left(\frac{{r}_{1}}{{r}_{2}}\right)}^{2}$ (B)${\left(\frac{{r}_{2}}{{r}_{1}}\right)}^{2}$ (C) $\frac{{r}_{1}}{{r}_{2}}$ (D) $\frac{{r}_{2}}{{r}_{1}}$

Subject: Physics, asked on 11/5/18

Plz solve this fast! 13. The distance from the surface the earth at wtuch the acceleration due to gravity is the same below and above  the surface of the earth.

Subject: Physics, asked on 10/5/18

cos tetha = -1/2, tetha = ?

Subject: Physics, asked on 3/5/18

A spaceship is moving directly toward a planet at a speed of 70% of the light speed.When the spaceship is 3x10^8 m from the planet, a pulse of light is emitted by the spaceship from an outside observer,how long does it take the light pulse to travel from the spaceship to the planet?

Subject: Physics, asked on 17/4/18

Solve this: 8. What is a period of revolution of earth satellite ? Ignore the height of satellite above the surface of earth.  Given ; (1) The value of gravitational acceleration g=10 ms-2            (2) Radius of earth RE =6400 km. Take $\mathrm{\pi }$=3.14 (1) 85 minutes               (2) 156 minutes (3) 83.73 minutes          (4) 90 minutes.

Subject: Physics, asked on 14/4/18

two satellites are at different heights(smaller and larger)from the surface of earth.which would have greater velocity?

Subject: Physics, asked on 12/4/18

The weight of an object in the coal mine, sealevel, at the top of the mountain are W1, W2 &W3 respectively. Arrange them in increasing order of weight.

Subject: Physics, asked on 4/4/18

what is escape velocity and what is its value for Earth

Subject: Physics, asked on 4/4/18

what is orbital velocity and show that it does not depend on the mass of the body

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