(5 bulbs)·(60 watts/bulb)·(20 minutes)·(1 joule per sec/watt)·(60 sec/minute)
= (5·60·20·1·60) (bulb·watt·minute·joule per sec·sec) / (bulb·watt·minute)
= 360,000 joules
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Another way:
Five 60-watt bulbs = 300 watts = 0.3 kilowatt
20 minutes = 1/3 hour
(0.3 kilowatt) · (1/3 hour) = 0.1 kilowatt-hour
It can be found in the U.S. and other parts around the world! It doesn't come from the Amazon River, but it's been found in Brazil before. Also, Amazonite is a green variety of "Microline Feldspar".
Given Information:
v = 3.5x10⁵ m/s
θ = 60°
Magnetic field = 0.60 T
no. of electrons = 6.242x10¹⁸
radius = 0.750 m
Required Information:
Magnetic force = F = ?
Magnetic field = B = ?
Answer:
Part A) F = 2.909x10⁻¹⁴ N
Part B) B = 5.34x10⁻⁷ T
Explanation:
Part A:
The magnetic force can be found using
F = qvBsin(θ)
Where q = 1.60x10⁻¹⁹ C and v is the speed of electron, B is the magnetic field and θ is the angle between v and B.
F = 1.60x10⁻¹⁹*3.5x10⁵*0.60sin(60°)
F = 2.909x10⁻¹⁴ N
Part B:
From the Ampere's law, the magnetic field can be found using
B = μ₀I/2πr
Where μ₀ = 4πx10⁻⁷ is the permeability of free space, I is the current, and B is the magnitude of the magnetic field produced.
1 ampere of current has 6.242x10¹⁸ electrons per second so
I = 1.25x10¹⁹/6.242x10¹⁸
I = 2.0032 A
B = 4πx10⁻⁷*2.0032/2π*0.750
B = 5.34x10⁻⁷ T
Answer:
6.4 kgm²/s
Explanation:
the formula for angular momentum is
Angular momentum, L= radius/distance, r * linear momentum, p
i.e L = r * p
and linear momentum = mass * velocity i.e p = m*v
Hence, L = m*v*r
we are given the following:
mass of particle, m = 2 kg
velocity/speed of particle, v = 0.8 m/s
radius/distance, r = the value in y axis = 4m
substituting the values, we have
L = 2 * 0.8 * 4 = 6.4 kgm²/s
