People can break down the rock by touching or the heat can even break down the rock
The original Coulomb force between the charges is:
Fc=(k*Q₁*Q₂)/r², where k is the Coulomb constant and k=9*10⁹ N m² C⁻², Q₁ is the first charge, Q₂ is the second charge and r is the distance between the charges.
The magnitude of the force is independent of the sign of the charge so I can simply say they are both positive.
Q₁ is decreased to Q₁₁=(1/3)*Q₁=Q₁/3 and
Q₂ is decreased to Q₂₂=(1/2)*Q₂=Q₂/2.
New force:
Fc₁=(k*Q₁₁*Q₂₂)r², now we input the decreased values of the charge
Fc₁=(k*{Q₁/3}*{Q₂/2})/r², that is equal to:
Fc₁=(k*(1/3)*(1/2)*Q₁*Q₂)/r²,
Fc₁=(k*(1/6)*Q₁*Q₂)/r²
Fc₁=(1/6)*(k*Q₁*Q₂)/r², and since the original force is: Fc=(k*Q₁*Q₂)/r² we get:
Fc₁=(1/6)*Fc
So the magnitude of the new force Fc₁ with decreased charges is 6 times smaller than the original force Fc.
Answer:
7.344 s
Explanation:
A = 0.15 x 0.3 m^2 = 0.045 m^2
N = 240
e = - 2.5 v
B1 = 0.1 T
B2 = 1.8 T
ΔB = B2 - B1 = 1.8 - 0.1 = 1.7 T
Δt = ?
e = - dФ/dt
e = - N x A x ΔB/Δt
- 2.5 = - 240 x 0.045 x 1.7 / Δt
2.5 = 18.36 / Δt
Δt = 7.344 s
Answer:
so the height will be increased by 9 times
Explanation:
The truck is in its pontential energy at rest
The potential energy is converted to kinetic energy when in motion
Given that,
h = height of the hill
m = mass of the truck
g = acceleration due to gravity
v = velocity of the truck at the bottom of the hill.
At the top of the hill,
Potential energy(PE) = mgh
Kinetic energy(KE) = 0
Total energy, E = PE + KE = mgh + 0 = mgh____(1)
At the bottom of the hill :
Potential energy, PE = 0
Kinetic energy,KE = (1/2)mv²
Total energy, E = PE + KE
= 0 + (1/2)mv²_____(2)
In law of conservation of energy,
(1) = (2)
mgh = (1/2)mv²
h = (1/2g)v²
given,
v = 2 m/s
g = 9.81 m/s²
h = (1/2(9.81)) × 2²
h = 0.20 m
so,
if v = 6 m/s
h = (1/2(9.81)) × 6²
h = 1.83 m
from the first h = 0.20m and the second h = 1.83m
1.83m / 0.20m
= 9.15
so the height will be increased by 9 times
Answer:
The apparent weight is less than that of the real weight because of buoyancy.
Explanation:
Buoyancy is the upward thrust that is experienced by the object that is either fully or partially immersed in the object. The weight of the immersed object will be equal to the mass of the liquid that is displaced by the object. Buoyancy can be calculate based on Archimedes's Principle. Buoyancy also acts in the air, the normal force is reduced than the force of gravity. Buoyancy is the ability to float in liquid as well as in air. This floating happens when various forces acts on the opposite direction. The direction of the force will always remain upwards.