In physic, velocity is a vector quantity. You specify a velocity if you know its magnitude and its direction
On the other hand, speed is a scalar quantity. Speed has magnitude but no direction.
Answer:
Yes. Gravity is 90% of what it is on the earth's surface. ISS moves at such high speeds that the curve of its fall will always match the curve of the earth and so will never hit the earth.
Explanation:
The location of the International Space Station (ISS) is at an altitude of about 200 or 250 miles above the earth's surface. Since gravity decreases with altitude, it is less at that height. Gravity is still present there. Since the ISS is in orbit around the earth, the condition is of free fall. Result of this free fall is apparent weightlessness. The high speed of the ISS allows it to orbit around in such a way that the gravitational pull of the earth is equal to the centripetal force experienced by the ISS in its orbit.
The conditions which make it remain in space are similar to how the moon stays in the orbit around the earth. Moon is also in free fall but it never falls down to earth.
Answer:
The ratio of the man's kinetic energy to that of the woman's kinetic energy is 0.629.
Explanation:
Given;
weight of the man, W = 700 N
Weight of the woman, W = 440 N
momentum is given by;
Kinetic energy of the man;
Momentum of the man is calculated as;
The kinetic energy of the woman is given by;
The momentum of the woman is given;
Since, momentum of the man = momentum of the woman
mass of the mas = 700 / 9.8 = 71.429
mass of the woman is = 440 / 9.8 = 44.898
Therefore, the ratio of the man's kinetic energy to that of the woman's kinetic energy is 0.629.
