Test example

1 )


I go from A to C passing through B . Calculate the distance and the displacement magnitude.

d =

l d l =


2 ) In the previous exercise, the spent time is 2 s . Calculate the scalar velocity and the vector velocity magnitude.

v =

l v l =


3 ) I travel at the velocity v₀ = 6 m/s e reach the velocity v = 18 m/s in 4 s . Which is my acceleration?

a =


4 ) I stand still, then reach the velocity v = 16 m/s in 4 s . Which is the space covered in the 4 s ?

s =


5 ) A running point covers 6 times a circumference in 24 s . Calculate the period and the frequency.

T =

f =


6 ) I lay a force F = 18 N to a body and cause a 3 m/s² acceleration . Which is the body mass?

m =


7 ) Which is the weight force F_g of a body, with the mass m = 10 kg ?

F_g =


8 )

The force F = 8 N causes the displacement d = 4 m as in figure. Which is the force work?

W =


9 ) In the previous exercise, the work is carried out in 8 s . Which is the force power?

P =


10 ) I have to go in a site, where the temperature is T = 36 °F . What have I to wear, the overcoat or the swimming tog?




11 )


q₁ = + 6 C , q₂ = - 6 C . The charge q₁ attracts or repels the charge q₂ ?




12 ) In the previous exercise, calculate the Coulomb's force magnitude between the two charges





13 )


q₁ = - 12 C . Calculate the electric field magnitude in the point A .





14 ) The charge 12 C runs across the conductor section on 3 s . Which is the current intensity?

i =


15 ) A conductor is subjected to the potential difference ΔV = 24 V and is crossed by the current i = 4 A . Which is its resistance?

R = Ω


16 )


R₁ = 3 Ω , R₂ = 7 Ω . Which is the whole device resistance?

R = Ω


17 )


R₁ = 4 Ω , R₂ = 6 Ω . Which is the whole device resistance?

R = Ω


18 )


The current intensity i = 12 A runs along the straight wire as in figure. Calculate the magnetic induction magnitude B in the point A , which is 3 m away from the wire. The force lines of B , seen from the heigh, have clockwise or anticlockwise way?







19 )


The current intensity i = 7 A runs along the solenoid which has 6 windings and is 20 cm long. Calculate the B magnitude, along the solenoid axis, at the center.

l B l = μ₀


20 )


In an a.c. transformer , the primary has 20 windings and the secondary 60 windings.
I apply the alterned potential difference ΔV₁ = 12 V to the primary , with the intensity i₁ = 18 A . Which is the ΔV₂ at the ends of the secondary? Which is the i₂ in the secondary?

ΔV₂ =

i₂ =