Answer:
The gravitational potential energy of the ball is more than 30 J.
Explanation:
Given that,
Gains kinetic energy = 30 J
We need to calculate the gravitational potential energy
According to law of conservation of energy
If there is no air resistance then the potential energy of the ball fully converted into kinetic energy.
If the air resistance is considered then the potential energy used to do work against air resistance.
According to question,
A ball drops some distance and gains 30 J of kinetic energy and considers air resistance then 30 J of potential energy can be loosed by the ball.
Hence, The gravitational potential energy of the ball is more than 30 J.
Answer:
25N
it will float since the water displaced is less than the weight. buoyancy = 25n down
Explanation:
40 newtons - 25 newtons = 25 newtons
Answer:
I'm going to go out on a limb and say D. All of the above
Explanation:
Answer:
towards the south
Explanation:
When the electron enters the region with magnetic field, it experiences a magnetic force perpendicular to both the directions of the electron's velocity and the magnetic field.
The direction of the force exerted on the electron can be found by using the right-hand rule:
- Index finger: direction of the velocity of the electron --> towards the east
- Middle finger: direction of the magnetic field --> downward
- Thumb: direction of the force on a positive particle --> towards the north
However, the electron is a negatively charged particle, so we must reverse the direction of the force: therefore, the force exerted on the electron is towards the south.
Magnitude of the force is the same as force so F=ma (mass x acceleration). The mass is 480 and you have to convert the acceleration to m/s so it’s 40km/h /3.6 = 11.1m/s. F= 480 x 11.1 therefore the magnitude of the force is 5,333.3... N
