We can solve the problem by using Ohm's law.
The resistance of the person, with dry skin, is
. In order to be felt, the current must be at least
Ohm's law gives us the relationship between current and voltage:
where
I is the current
R the resistance
V the voltage
Using the data of the problem, we find that the minimum voltage needed is
Answer:
A) A negative charge of value Q is induced on sphere B
B) there is an attraction between sphere
C) The charge of sphere A is distributed between the two spheres,
Explanation:
This is an electrostatic problem, in general charges of the same sign attract and repel each other.
with this principle let's analyze the different situations
A) The sphere A that is insulating has a charge on its surface and zero charge is its interior
The conducting sphere B has zero charge, but the sphere A creates an attraction in the electrons, therefore a negative charge of the same value as the charge of the sphere A is induced in the part closest and in the part farther away than one that a positive charge.
A negative charge of value Q is induced on sphere B
B) In this case there is an attraction between sphere A with positive charge and sphere B with negative induced charge
C) When the two spheres come into contact, the charge of sphere A is distributed between the two spheres, therefore each one has a positive charge of value half of the initial charge, as now we have net positive charges in the two spheres charges of the same sign repel each other so the spheres separate
Answer:
Explanation:
- Given λ = wavelength of light reflected = 635 nm
- Using the equation ; 2 nb t = (m - (1/2)λ
Plugging the values in the equation ;
- 2 (1.50) t = (1 - (1/2) (635)
- t = 105.83 nm = the minimum thickness of the film
b) To calculate the wavelength of the most reflected visible light ;
- From the equation 2 nb t = mλ
Plugging the values into the equation
- λ' = wavelength = 317.5 nm
Answer:
W = 157.5kJ
Explanation:
Assuming it moves the container at constant speed, the work done by the crane will be equal to the variation of the potential gratitational energy on the container:
where h2= -8m and h1=0m
Wc = 157.5kJ
Answer:
1) Translational equilibrium(Net force =0) and rotational equilibrium(net torque=0)
2)m1/m2=r2/21
Explanation:
