In the early part of the 1900's, some felt that space travel was not possible; in space, there is no air for the spacecraft to push back on, therefore, by Newton's 3rd law, forces cannot be exerted on the spaceship and spacecrafts cannot change direction nor speed. The solution to this is to eject fuel at high speeds. The fuel is ejected to the back to make the rocket speed up. The fuel is ejected to the front to make the rocket slow down, and the fuel is ejecred sideways to change directions. This is the principle behind rockets. A rocket of total mass 589 kg (including fuel) is moving at 8 kilometers/sec relative to the Earth. It ejects 98 kg of burnt fuel backwards at an average speed of 2 kilometers/sec relative to the Earth. How fast is the rocket moving after this fuel is ejected
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Physics, 22.06.2019 00:00, hlhunter11p8f0o0
An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?
Answers: 1
Physics, 22.06.2019 01:00, muhammadcorley123456
4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that
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Physics, 22.06.2019 01:10, Katyazamo
The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping
Answers: 1
Physics, 22.06.2019 10:30, Kathryn014
Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?
Answers: 2
In the early part of the 1900's, some felt that space travel was not possible; in space, there is no...
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