大家还有人会高中电学的物理么?

[OOOOOO]

Two charged smoke particles exert a force of 0.00001 N on each other. What will be the force if they are moved so they are 1/5 as far apart? n.b. give your answer in Newtons, and express scientific notation as 1.60E-03 for 1.60 times 10 to the power of minus three.

 

[OOOOOO]

Question 2 (10 points)
A force of 33 N is exerted on a 47µC charge. What is the magnitude of the electric field at this point? n.b. give your answer in N/C

 

[OOOOOO]

Question 3 (10 points)
Calculate the magnitude of the electric field at the centre of a square 10 cm on a side, if one corner is occupied by a 14 µC charge and the other three are occupied by 6 µC charges.
(Hint: what would the field be if they wre all equal?)
n.b. give your answer in N/C

 

[OOOOOO]

Question 4 (10 points)
A charged object of mass 6 g and charge 7 µC is released from rest in a uniform electric field and accelerates a rate of 535 m/s2. What is the magnitude of the electric field? n.b. give your answer in N/C

 

[OOOOOO]

Question 5 (10 points)
The earth has a radius of 3850 km and an electric field at the surface of 138 N/C. What would the charge need to be on the Earth's surface to maintain this?

 

[Consciousness]

1.
0.00001/ (0.04) N

 

[Consciousness]

............
2.
33 N/47µC

 

[Consciousness]

下面的用
3.
F=kq1q2/r^2
E=F/q
find the net field

4.
F=ma
E=F/q


5.
E=Kq/r^2

 

[小学数学]

What is the repulsive electrical force between two protons in a nucleus that are 5.7x 10-l5m apart from each other?
n.b. give your answer in Newtons.
7.08E0 (7.08 * 100)

What is the magnitude of the acceleration (in m/s2) experienced by an electron in an electric field of 48.2 N/C?
8.44E12 (8.44 * 1012)

Calculate the magnitude of the electric field at the centre of a square 2 cm on a side, if one corner is occupied by a 14 µC charge and the other three are occupied by 8 µC charges.
(Hint: what would the field be if they wre all equal?)
n.b. give your answer in N/C
2.70E8 (2.70 * 108)

A charged water droplet of radius 0.030 mm remains stationary in the air, as the electric force on it just balances the gravitational force. If the electric field of the Earth is 150 N/C, how many excess electron charges must the water droplet have?
4.62E7 (4.62 * 107)

A ball of mass 8 g hangs from a string in a horizontal electric field of 42 N/C. If the string hangs at an angle 5°, what is the charge on the mass.
n.b. give your answer in Coulombs
1.63E-4 (1.63 * 10-4)

看来,学Physics 1008的人多啊.

 

[easterngod]

easy ones...... 没有学PHYS1004的MM么? ...