Answer:
Density = Mass/Volume => Volume = Mass/Density = 12/3.1 = 3.87ml
Explanation:
(a)
In a velocity selector, the speed of the beam is related to the magnitude of the electric field and of the magnetic field by the formula:
where
E is the magnitude of the electric field
B is the magnitude of the magnetic field
In this problem, we have
(magnetic field)
(speed of the particles)
Solving the equation for E, we find the electric field:
(b) 3.2 kV
The relationship between electric field and potential difference between the two plates is:
where, in this problem:
is the magnitude of the electric field
is the separation between the plates
Substituting into the equation, we find the potential difference:
Answer:
B
Explanation:
Use conservation of momentum: Total momentum of the system before is the same as the total momentum after the collision. Since both are moving north, the momentum of both cars is in the same direction, and the total momentum before collision is 1000kg*20m/s + 1500kg*36m/s = 74000kg-m/s.
This is the same amount of momentum after collision, and since they are locked together, their mass is added. The velocity can be found by: 74000kg-m/s ÷ 2500kg = 29.6m/s.
momentum = mass*velocity
Answer:
Explanation:
I can use insulated materials to cover the doors, windows and floors or I use quilted blankets to cover the doors, windows and the floor, this will reduce the sound coming in the room and the sound escaping out of the room.
I can possibly use carpet or floor mats on the floor, especially in front of the door to cover the crack that may be underneath it.