Answer:
The electric field does positive work on the charge.
The potential energy associated with the charge decreases.
Explanation:
We know that force due to electric filed on a charge particle q given as
F = q E --------1
If the positive charge is moving in the direction of electric filed it means that force due to electric field and displacement of particle due to motion is in the same direction.So the work done due to electric filed will be positive.
Work = Force . Displacement
W= F.d
F= W/d ---------2
From equation 1 and 2
W/d = q E
W/ q = E/ d
We know that voltage difference ΔV
ΔV = E/ d
ΔV =W/ q
So the potential difference will be decrease because charge is positive.So the potential energy will be decreases.
Answer:
Speed of A = 891 km/h
Speed of B = 804 km/h
Explanation:
Let the speed of aeroplane B is v, the speed of aeroplane is A is 87 km/h faster than B.
So, the speed of aeroplane A is 87 + v.
Distance traveled by A after 7 hours, d1 = (87 + v) x 7
Distance traveled by B after 7 hours, d2 = v x 7
Total distance traveled = 11865 km
So, d1 + d2 = 11865
(87 + v) x 7 + v x 7 = 11865
609 + 14 v = 11865
14 v = 11256
v = 804 km/h
So, the speed of A = 87 + 804 = 891 km/h
Speed of B = 804 km/h
<span>a) M is the big one
m is the little one
v is the speed of each of them when they impact
V = speed of mii after collision
Conservation of momentum
Mv – mv = mV
Conservation of energy
1/2Mv^2 + 1/2mv^2 = 1/2 mV^2
This pair simplify to give
M = 3m
V = 2v
So m = 0.21kg
and h = 4 . 2.7 = 10.8 m</span>Source(s):<span>Old teacher</span>
Answer:
91.3 kg
Explanation:
weight = m*g
m: mass
g: gravity = 9.8 or 10 (depends on what your instructor tells you to use)
mass = w/g
895/9.8 = 91.3 KG
Alternating current (AC) flows half the time in one direction and half the time in the other, changing its polarity 120 times per second with 60-hertz current.
