The average radius(r) of each grain is r = 50 nanometers
= 50*10^-6 meters
Since it is spherical, so
Volume=(4/3)*pi*r^3
V= (4/3)*pi*(50*10^-6)^3
V=5.23599*10^-13 m^3
We are given the Density(ρ) =2600kg/m^3
We know that:
Density(p) = mass(m)/volume(V)
m = ρV
So the mass of a single grain is:
m = 5.23599*10^-13 * 2600 = 1.361357*10^-9 kg
The surface area of a grain is:
a = 4*pi*r^2
a = 4*pi*(50*10^-6)^2
a = 3.14*10^-8 m^2
Since we know the surface area and mass of a grain, the
conversion factor is:
1.361357*10^-9 kg / 3.14*10^-8 m^2
Find the Surface area of the cube:
cube = 6a^2
cube = 6*1.1^2 = 7.26m^2
multiply this by the converions ratio to get:
total mass of sand grains = (7.26 m^2 * 1.361357*10^-9 kg)
/ (3.14*10^-8 m^2)
total mass of sand grains = 0.3148 kg = 314.80 g
Answer:
324.76J
Explanation:
Given parameters:
Force of pull on the box = 25N
Displacement = 15m
Angle of pull = 30°
Unknown:
Work done by the force = ?
Solution:
Work done is the force applied on a body to move it through a particular distance.
It can be expressed as;
Work done = F x dcosФ
F is the force
d is the displacement
Ф is the angle
So;
Work done = 25 x 15cos 30 = 324.76J
Answer:
a) Effective resistance when diode was forward biased = 0 Ω
b) Effective resistance when diode was reverse biased = ∞ Ω
Explanation:
Please refer attached characteristic curve for diode.
a) As per the characteristic curve, when the diode was forward biased by 0.7 Volt theoretically infinite current was flowing across the diode.
Hence effective resistance for the diode in forward biased = = 0 Ω
b) As per the characteristic curve, when the diode was reversed biased by 0.7 Volt theoretically zero (0 amp) current was flowing across the diode.
Hence effective resistance for the diode in forward biased = = ∞ Ω
<span>The movement of Alaskan and northern water currents southward down the west coast results in much cooler ocean temperatures than at comparable latitudes on the east coast of the United States, where waters currents come from the Caribbean and Tropical Atlantic.</span>
Si units or Systeme' de Internationale' is a widely adopted unit system in measuring basic and derived dimensions In this case, the SI units here are kilograms, meter and seconds. Pounds is an English unit. mass is the measure of <span>how much matter an object contains, hence the answer is A. 43 kg.</span>