Answer:
The neddle of the galvanometer will move to the right at a faster speed.
Explanation:
Given:
The north pole of a bar magnet is moving towards a solenoid and the needle of the galvanometer moves to the left.
When a bar magnet has a relative deisplacement with respect to a solenoid, then it will induce some emf within the solenoid according to Faraday's law. When the north pole is moving towards the solenoid it will induce a current.
When the bar magnet is moving away from the solenoid at a faster speed, the rate of change of flux in the solenoid is faster. So the induced current will change in faster way, but in the opposite direction.
Thus, the neddle of the galvanometer will move to the right at a faster speed.
C. Scientific theories are based on opinions.
Laws are not based on opinions. They are proven.
Answer:
The mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.
Explanation:
HOW TO CALCULATE MASS?
The mass of a moving object can be calculated by using the following expression:
K.E = ½ mv²
Where;
K.E = kinetic energy (Joules)
m = mass (kg)
v = velocity (m/s)
According to this question, rolling ball has 18 joules of kinetic energy and is rolling at 3m/s. The mass is calculated as follows:
18 = ½ × m × 3²
18 = ½ × 9m
36 = 9m
m = 4kg
Therefore, the mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.
