3. If there is an atomic mass of 47 and the atomic number is 20,
how
many protons and neutrons
are there?

20

27

Explanation:

Given parameters:

Atomic mass  = 47

Atomic number  = 20

Unknown:

Number of protons  = ?

Number of neutrons  = ?

Solution:

To solve this problem,

  Atomic mass  = number of protons + number of neutrons

    Atomic number  = number of protons

So;

   Number of protons  = 20

 Now;

    Number of neutrons  = Atomic mass  - number of protons

     Number of neutrons  = 47  - 20  = 27

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:

in physics zero. in muscle fatigue could be high