Mechanics | Relativity Answers

THE LINE OF ACTION OF THE RESULTANT FORCE OF TWO LIKE PARALLEL FORCES SHIFTS BY ONE-FOURTH OF THE DISTANCE BETWEEN THE FORCES WHEN THE FORCES ARE INTERCHANGED. THE RATIO OF THE TWO FORCES IS ?

WHEN A FORCE F ACTS ON A BODY OF MASS M , THE ACCELERATION PRODUCED IN THE BODY IS A . IF THREE EQUAL FORCES F1=F2=F3 ACT ON THE SAME BODY , ANGLE B/W F1 AND F2 IS 90 AND F2AND F3 IS 135. THE ACCELERATION PRODUCED IS- ??
FOR FIGURE , REFER DC PANDEY VOLUME 1 PAGE NO. 138

A 2000 kg satellite orbits the earth at a height of 300 km. What is the speed of the satellite and its period? Take
G=6:67×10−11Nm2=kg2
, Mass of the earth is
5:98×1024
kg

A man weighs 750 N on the surface of the earth. What would be his weight when standing on the moon? The masses of the earth and the moon are respectively,
5:98×1024
kg and
7:36×1022
kg. Their radii are respectively
6:37×103
km and
1:74×103
km

At what altitude above the earth's surface would the acceleration due to gravity be
4:9ms−2
? Assume the mean radius of the earth is
6:4×106
metres and the acceleration due to gravity
9:8ms−2
on the surface of the earth

A projectile thrown at 45degree just cross the top of pole whose foot is 6 m from point of projection. The projectile falls on the other side at a distance 3m from foot of pole. Height of pole is????
(a) 1.5 m
(b) 2 m
(c) 2.5 m
(d) 3 m

A particle is moving in the x-y plane under the influence of a force such that its linear momentum is
P(t)=A(cos(kt)i-sin(kt)j), A and k are constants. The angle b/w force and linear mom is ????

A tunnel is dug across diameter of earth.A ball is released from surface of earth into the tunnel. The velocity of ball when it is at a distance R/2 from centre of earth is
answer in terms of G,M and R
R is radii of earth and M is mass of earth

a spot light rotates in a horizonta plane with a constant angular velocity. A spot of light P moves along wall. The velocity of spot along the wall is 6m/s,when spot light is rotated by 45degree .what is angular velocity of spot light??
(a) 1rad/s (b) 2rad/s (c)0.5rad/s (d)0.1rad/s

Which of the following is NOT a unit of energy?
joule
newton-metre
kilowatt-hour
watt