Answer:
Conservation Tillage preparation of soil by digging, stirring, and overturning.
Pros: reducing soil erosion, reducing the costs of soil preparation and conserving soil moisture
Cons: you will always need herbicides for weed management, planting may be delayed because of wet or cool soil temperatures. You will always have problems with weed ,insects, and plant disease.
hope that helps you
Explanation:
Answer:
40000 J or 40 kJ
Explanation:
Work is the net force times the distance.
W = Fd
W = (1000 N) (40 m)
W = 40000 J
Notice that the time doesn't affect the amount of work done.
Answer:
Electromagnetism has important scientific and technological applications. It is used in many electrical appliances to generate desired magnetic fields. It is even used in a electric generator to produce magnetic fields for electromagnetic induction to occur. It has many more technological applications including MRI scanning (magnetic resonance imaging) and electric bells.
Explanation:
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
Answer:
A. 1.11[mL/g]
Explanation:
We have to remember the expression to calculate the density, which says it's the relationship between mass and volume.
We can calculate the different densities for each of the samples.
density1 = m/V = 200/180 = 1.11[mL/g]
density2 = m/V = 300/270 = 1.11[mL/g]
density3 = m/V = 400/270 = 1.11[mL/g]
According to the initial data, we can determine that the density corresponds to 1.11 [mL/g]
Answer:
1) an observer in B 'sees the two simultaneous events
2)observer B sees that the events are not simultaneous
3) Δt = Δt₀ /√ (1 + v²/c²)
Explanation:
This is an exercise in simultaneity in special relativity. Let us remember that the speed of light is the same in all inertial systems
1) The events are at rest in the reference system S ', so as they advance at the speed of light which is constant, so it takes them the same time to arrive at the observation point B' which is at the point middle of the two events
Consequently an observer in B 'sees the two simultaneous events
2) For an observer B in system S that is fixed on the Earth, see that the event in A and B occur at the same instant, but the event in A must travel a smaller distance and the event in B must travel a greater distance since the system S 'moves with velocity + v. Therefore, since the velocity is constant, the event that travels the shortest distance is seen first.
Consequently observer B sees that the events are not simultaneous
3) let's calculate the times for each event
Δt = Δt₀ /√ (1 + v²/c²)
where t₀ is the time in the system S' which is at rest for the events
