Answer: kinetic energy remains constant.
Explanation: The force on the charged particle is always perpendicular to the direction of its movement. Also, magnetic forces cause charged particles to change their direction of motion, but they do not change the speed of the particle. If the force is perpendicular to the motion, then no work is done. Hence magnetic forces do no work on charged particles and cannot increase their kinetic energy. Kinetic energy is therefore remain constant.
Both the velocity and acceleration are vector quantities. It means that this parameter does not only have magnitude, but also the direction of motion. The direction is incorporated by the + or - sign depending on the sign convention. In this case, the downward motion is + while the upward motion is -. Thus, the velocity is equal to +0.89 m/s while the acceleration is -2.92 m/s².
Answer:
False
Explanation:
Energy keeps on converting from one form to another and it is useful in each of its forms.
For instance, the kinetic energy get converts into potential energy, mechanical energy of motor converts into electrical energy, sound energy (phone) converts into electrical energy etc. but in all these forms energy is useful in one or the other way.
Hence, the given statement is false.
Recall that
where
- is the final velocity of the train; 0 in this case, because the train eventually stops
- is the initial velocity of the train; 1.0 m/s in this case, because this initial velocity refers to velocity it starts with after one of the wheels gets stuck, and the train is initially traveling at a constant speed of 1.0 m/s
- is the acceleration we want to find
- is the change in the train's position; 5.0 m in this case
So we have