Answer:
Part 1: 0.3789
Part 2: 746 J
Part 3: 2.162 kW
Explanation:
Part 1:
Eff= 
Eff= 0.378873 ≈ 0/3789
Part 2:
W= 0.3789(1969)
W= 746 J
Part 3:

Power= 2162.3188 Watts
2162.3188 W-----> 2.162 kW
Answer:
by applying a magnetic force to recycled materials
f=MG
100kg*10=1000
work done =force *distance
1000*3
3000N
Answer:
boron
aluminum
gallium
indium
thallium
Explanation:
Any of these could work. Nitrogen has 5 valence electrons so you just needed to pick an element that has 3 valence electrons that nitrogen could borrow. This periodic table shows valence electron counts:
Answer:
Part a)

Part b)

Part c)

Part d)

Explanation:
As we know that he start from rest and moves with uniform acceleration
so here we can say that

as we know here that he move with uniform speed from t = 7 to t = 11
So we will have


Part b)
If Donald runs for 3 s after reaching his maximum speed
So here distance moved by Donald


Part c)
Distance of Donald from start line is given as


Part d)
Distance from start line after t = 8.5 s


