Answer:
False
Explanation:
If a point charge has electric field lines point into it,then charge must be negative because electric lines point into negative charges and point out of positive charges
Answer:
Fm is the net force down on the metal in air
Fm / 2 is the net force down on the metal in liquid
Fl is the buoyant force on the metal due to liquid
Fm - Fl = Fm / 2 equating upward and downward forces
Fm / 2 = Fl
The specific gravity of the metal is twice that of the liquid
Note: F = M g = ρ V g since ρ = M / V
Answer:
Their translational kinetic energies are the same
Explanation:
The translational kinetic energy of an object is given by the formula:
Where m = the mass of the object and
v = the linear speed of the object
From the question, it is stated that wheel A has the same mass as wheel B, that is 
Linear speed is also a function of the distance covered. Since both wheels cover the same distance within the same interval, we can conclude that 
Both wheels A and B have equal speed and mass, this means that their translational kinetic energy is the same.
Note that translational kinetic energy is not a function of the radius
Answer:
a) 7.02 W/m²
b) 1.53 J
Explanation:
Given
Amplitude of the electric wave, = 72.7 V/m
Area of flow, A = 0.0211 m²
Time taken, t = 10.3 s
To calculate the Intensity, S. We use the formula
I = E(rms)² / (cμ), where
E(rms) = E / √2 = 72.7 / √2
E(rms) = 72.7 / 1.4142
E(rms) = 51.41
c = 2.99*10^8
μ = 1.26*10^-6
I = 51.41² / [(2.99*10^8) (1.26 x 10^-6)]
I = 2642.99 / 376.74
I = 7.02 W/m²
U = energy = IAt
U = (7.02) * (0.0211) (10.3) J = 1.53 J
