At the same instant that a 0.50-kg ball is dropped from 25 m above earth, a second ball, with a. mass of 0.25 kg, is thrown straight upward from earth’s surface with an initial speed of 15 m/s.. they move along nearby lines and pass each other without colliding. at the end of 2.0 s the. height above earth’s surface of the center of mass of the two-ball system is ?

Explanation:

As we know that the position of center of mass of the system of two masses is given as

here we know that

Similarly for another ball we have

now for COM for above two masses

i'm thinking more like energy

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: