Mechanics | Relativity Answers

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 5.98×1024kg
7.73 km/s and 5.4×103s
855.4km/s and 7.7×104s
497.2km/s and 5.5×105s
322.3km/s and 4.3×104s

Assume that a tunnel is dug across the earth(radius R) passing through its center. Find the time a particle takes to cover the length of the tunnel if
a) it is projected into the tunnel with a velocity (gR)^1/2
b)it is released from a height R above the tunnel
c)it is thrown vertically upward along the length of the tunnel with a speed (gR)^1/2

A stream of water flowing horizontally with a speed of 10m/s gushes out of a tube of crossectional area 10cm2 and hits a vertical wall nearby the force extracted the wall by impact of water (assume it rebounded)
1) 500N. 2) 20N. 3) 100N. ) 200N

A 6kg bomb at rest exploded into three equal pieces P,Q,R .if P and Q fly with equal speed 20 m/s making an angle 60 degree with each other.The angle between the direction of P and R is..
1) pai/4. 2) pai/2. 3) 3pai/4. 4) 5pai/6

A massless rope is stretched horizontally between two supports that are 3.0 m apart.
When an object of weight 3200 N is hung at the center of the rope, the rope is observed
to sag by 50 cm. Calculate the tension in the rope.

a boy and his father run together.mass of the boy is half of his father ; kinetic energy of father is half of his son.if the father increases his velocity 1 m/s , then the kinetic energy becomes equal of each . what is their initial velocity?
if they run with their own kinetic energy on a road which is inclined and the road makes an angle of 30 degree with horizontal, how much distance will each of them complete ?

the sum of two unit vector is also a unit vector.then magnitude of their different is..
1) 0. 2) root 2. 3) root 3. 4) root 7

a stone of weight W is thrown vertically upward with speed V' from ground level.a constant force f acting due to drag of air in its flight .the maximum height will be...

A 1kg stationary bomb is exploded in three parts having masses in the ratio 1:1:3 respectively. Parts having same mass move in perpendicular direction with velocity 30m/s, then the velocity of bigger part will be?
Ans : 14.14 m/s

how many times more intense is 20 dB sound compared to 10dB sound.
1) 10time 2) 1/10 time. 3) 1/2 time. 4) 2 time.