Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive
Answer:
C direction
Explanation:
Reversing the direction of the flow of electric current in a wire coil reverses an electromagnet's north and south poles.
Every time the north and south poles is exchanged, the direction of flow of electric current in a w ire reverses.
- An electromagnet is a form of magnet in which the magnetic effect is produced by the movement of electric current in wire.
- A coil of wire wound round and connected to an electric source will produce an electromagnet.
- When we change the direction of flow of the current the polarity of the poles will also change.
Answer:
The average force ≅ 519.44 N.
Explanation:
Impulse = change in momentum of a body
i.e Ft = m(v - u)
where F is the force, t is the time, m is the mass of the body, v is the final velocity and u is the initial velocity.
m = 55.0 g (0.055 Kg), t = 0.00360 s, v = 34.0 m/s, since the ball was initially at rest; u = 0 m/s
So that,
F x 0.00360 = 0.055(34 - 0)
F x 0.00360 = 0.055 x 34
= 1.87
F = 
= 519.4444
The average force exerted on the ball by the club is approximately 519.44 N.
