Answer: 6.21 m/s opposite to Janet
Explanation:
Given
mass of Janet
mass of Sarah
The initial velocity of Janet
The final velocity of Janet after the collision is
the final velocity of Sarah after the collision is
Conserving linear momentum
Negative indicates the direction of velocity is opposite than of Janet
Answer:
The amount of work must be do to rotate the bar magnet is 151.2 J
Explanation:
Given:
Magnetic moment
Magnetic field T
To find work do to rotate the bar magnet,
From the formula of work done in case of magnetic field,
Here changes 0 to 180
But
J
Therefore, the amount of work must be do to rotate the bar magnet is 151.2 J
It's not possible to calculate the current with the given data. "Amp" is not a unit for measuring resistors, and "C" is not a unit for measuring batteries. So we don't know the resistance of this circuit or the potential difference applied to it, and thus can't calculate the current. If we could, it might turn out to be 3 gallons, but that's just a reckless guess.