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A rocket is intended to leave the Earth's gravitational ?eld.
The fuel in its key engine is a little less than the amount that is essential, and an auxiliary engine, only capable of operating for a short time, has to be used as well.
When is it best to switch on the auxiliary engine: at take-off, or when the rocket has nearly stopped with respect to the Earth, or does it not matter?
A woman walks 250m in the direction 35 degrees east of north, then 170m directly east. (a) using graphical method, find her final displacement from the starting point. (b) compare
It is found that when a liquid is free from the external forces, it always gets the shape of a spherical drop. It is due to, for a needed mass, a sphere has the least field area. I
derive the triangle law of vector
why we can''t reduce the range of AN AMMETER ?
The superposition theorem is a very useful network theorem. Write its statement
Coanda effect The effect which indicates that a fluid tends to flow along a surface, instead of flow through free space.
(1) Holes works as virtual charge, although there is no charge on holes. (2) Effectual volume of hole is more than electron. (3) Mobility of hole is fewer than electron.
What does gravitational force depend on? Gravitational force depends on mass and distance. Therefore, the formula for calculating gravitational force among two objects with
As we know that"The electric potential at a certain point inside the electric field is defined as the amount of work done in bringing a unit positive test charge uniformly (without
In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the
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