Answer:
0.25 m
Explanation:
The intensity of the magnetic field around a current-carrying wire is given by:
where
where
is the permeabilty of free space
I is the current
r is the distance from the wire
In this problem, we know:
is the magnetic field
is the current in the wire
Re-arranging the equation, we can find the distance of the field from the wire:
The inertia of an object is its resistance to linear acceleration due to an applied force—that is to say, the inertia of the physicist's friend is her mass.
Apply the conservation of linear momentum for the situation wherein two colliding objects separate after the collision:
m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'
Let us choose m₁ to be the mass of the physicist. v₁ and v₁' are velocities of the physicist before and after the collision, respectively.
m₂ is the mass of the physicist's friend. v₂ and v₂' are the velocities of the friend before and after the collision, respectively.
Given values:
m₁ = 81kg
v₁ = 7.0m/s
v₁' = 4.0m/s
v₂ = 5.0m/s
v₂' = 8.0m/s
Plug in the given values and solve for m₂
81×7.0 + 5.0m₂ = 81×4.0 + 8.0m₂
3.0m₂ = 243
m₂ = 81kg
Answer:
advantage : 1) produce no polluting gases .
2)doesn't contribute to global warming .
disadvantage: 1)waste is radioactive and safe disposal is very difficult and expensive.
2)local thermal pollution from east water affects marine life
Answer:
Energy = 1.132887kcal
Explanation:
Given
Mass = 55kg
Knee bend = 55
Efficiency = 20%
Displacement = 0.4m
First, we'll calculate the total Workdone
Work done = 2n(mgh)
Where n = 55, m = 55kg, g = 9.8m/s² and h = 0.4m
Work done = 2 * 55 * 55 * 9.8 * 0.4
Work done = 23,716J
Since the woman's efficiency is 20% of her total work done;
Then, .her energy = 20% of 23,716J
= 4,743.2
= 4.74KJ
Energy in kcal = 1.132887kcal
Density(rho) = m/v
(1.3)/((3.2)(17.1)(3.8))
since density is given in kg/m^3 you should convert the blocks dimensions to meters
1.3/(0.032*0.038*0.171)
plugging in these numbers would give you the density
1.3/0.000208
6250
with sigfigs= 6300kg/m^3