Answer:
Explanation:
Force between two charged conducting sphere
= k x Q₁ x Q₂ / r² , k is a constant Q₁ and Q₂ are charges and r is distance between them .
= 9 x 10⁹ x 12 x 10⁻⁹ x 18 x 10⁻⁹ / .30²
= 21600 x 10⁻⁹
= 2.16 x 10⁻⁵ N .
b )
After the spheres are joined together , there is redistribution of charge and remaining charge will be equally shared by them .
Charge on each sphere = (12 - 18 ) x 10⁻⁹ / 2
= - 3 x 10⁻⁹ C .
Force = 9 x 10⁹ x 3 x 10⁻⁹ x 3 x 10⁻⁹ / .30²
= 900 x 10⁻⁹ N .
Answer:
C. A. B.
Explanation:
Credit to Lainey in the comments for the answer!
Answer:
F = 10 [N]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = forces [N]
m = mass = 0.05 [kg]
a = acceleration = 200 [m/s²]
Answer:
frequency of the hum = 81 Hz
Explanation:
The velocity of the wave is determined by the relation
v = √(T/miu)
where v = velocity of the wave
T = tension on the string
miu = mass per unit length of the string or linear density = m/L
but here m= 5g = 0.005kg
L = 0.9 m
miu = 0.005/0.9 = 0.00556kg/m
To get the tension on the string we multiply the mass of the sculpture by the acceleration due to gravity, 9.8m/s²
T = 12kg x 9.8m/s² = 117.6 N
hence,
v= √(117.6/0.00556)
v = 145.43 m/s
But
wavelength = 2L = 2 x 0.9 = 1.8m
Also,
frequency = velocity/ wavelength
f = 145.43/1.8 = 80.7967 Hz
The frequency of the hum is 80.8Hz approximately 81Hz