physic物理问题英文41.how much force must be applied during liftoff to accelerate a 20-kg satellite just enough to counter the earth's gravitational acceleration of 9.8m/s22.you are driving a car down a straight road at a constant 55 miles per h
The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away. Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by the...
This straight-line inertial path of a satellite, however, is balanced by a strong gravitational attraction directed toward the center of the planet. Sometimes, a satellite's orbit looks like an ellipse, a squashed circle that moves around two points known as foci. The same basic laws of ...
This straight-line inertial path of a satellite, however, is balanced by a strong gravitational attraction directed toward the center of the planet. Sometimes, a satellite's orbit looks like an ellipse, a squashed circle that moves around two points known as foci. The same basic laws of ...
If you want a short answer, the word is "forces."People stick to Earth's surface even though the planet is rotating at high speed, and even there's no glue on the soles of our feet. The reason is simply that gravity bonds us to the planet with enough force to stop us whizzing ...
Assuming that proper radiation shielding is provided, the predominant environmental factor of spaceflight is microgravity—also known as weightlessness. Once settled on a new planetary body such as the Moon or Mars, these will have a gravitational regime different from the one on Earth (1 g). All...
This antenna is how the Voyagers receive commands from Earth and send the data they gather back. No matter where a Voyager spacecraft flies, the high-gain antenna always points toward Earth. One of the booms extending off of the main bus carries Voyager’s radioisotope thermoelectric power ...