The correct answer of the question is : A) Orbits a star, B) Gravity makes spherical and D) Clear orbits of other objects.
EXPLANATION :
The classification of a celestial object to be a planet depends on some parameters.
The most important thing about the planet is that it must clear its orbit. It means it won't share its orbit with other planets. Otherwise, it will be considered as a dwarf planet.
The second thing is that it must move around any stars. The star becomes the centre of that solar system around which planets start revolving in different orbits.
The third thing is that planets are approximately spherical in shape.
The size of the planets does not play a crucial role in the classification of planets. Planets may be smaller than mercury also.
Hence, all the options except the third one are suitable.
SONAR stands for "sound navigation and ranging,” and it is used to map and explore the ocean floor.
Answer:
v = 30.39 m/s
Explanation:
given,
mass of glider,M = 680 Kg
mass of the skydiver, m = 68 Kg
horizontal velocity,V = 30 m/s
when skydiver releases, velocity,v = 30 m/s
velocity if the glider,v' = ?
use the conservation of momentum
M V = m' v' + m v
m' = 680-68 = 612 Kg
680 x 30 = 612 x v + 60 x 30
612 v = 18600
v = 30.39 m/s
since the skydiver's speed will be the same as before release
The glider should continue to travel at 30.39 m/s since there are no external forces acting on it
Impulse = (force) x (time the force is applied)
Impulse = (25 N) x (0.16 sec)
<em>Impulse = 4 Newton-seconds</em>
