The velocity a rocket must reach to establish an orbit around earth is called
a. thrust velocity.
c. artificial velocity.
b. orbital velocity.
d. escape velocity.

The correct answer is "orbital velocity".

Explanation:

The expression for the orbital velocity is as follows;

Here, v is the orbital velocity, G is universal gravitational constant, M is the mass of the object and r is the distance.

The velocity which is required by the rocket to establish in an orbit around Earth is called  orbital velocity.

It is the velocity which is needed to keep the satellite in the orbit of the planet. This velocity is sufficient to keep the artificial satellite in an orbit of the earth.

Therefore, the correct option is (b).

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: