If a girl hits a ball with a bat, then the ball _____. a) exerts no force on the bat b)exerts a smaller force on the bat than th
2 answers:
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Answer:
Work=1800 J
Speed=3m/s
Explanation:
Work is product of force and distance moved, expressed as
W=Fd
Where F is force and d is distance in meters
Substituting 300 N for force and 6 m for d then
W=300*6=1800 J
Kinetic energy is given by
KE=½mv²
Where m is the mass and v is velocity
Here, KE=W hence
W=½mv²
Making v the subject then
Substituting 1800J for W and 400 kg for m then
Therefore, velocity is 3 m/s
The charge experiences no magnetic force when it is moving to the left or to the right
Explanation:
The force experienced by a charge moving in a magnetic field is given by the equation
where
q is the magnitude of the charge
v is its velocity
B is the strength of the magnetic field
is the angle between the directions of v and B
From the equation, we observe that:
- The force is zero when the charge is moving parallel (or anti-parallel) to the field, so when the angle between v and B is zero (or 180 degrees):
(
- The force is maximum when the charge is moving perpendicular to the field, so when the angle between v and B is 90 degrees:
From the first observation, we can say therefore that the charge in the problem will experience no magnetic force when it is moving parallel (or anti-parallel) to the field. Since the magnetic field points to the left, this means that the charge will experience no force when it is moving in one of the following directions:
- To the left
- To the right
Learn more about magnetic fields:
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