Density- It is a measurement of that how material is packed together tightly.
Its formula is ρ=m/v
where ρ is the density of material
m is the mass
v is the volume
here we have to find the length of cube's side
a cube of silver has a mass = 21 kg. = 21×10³ [∵1kg = 1000g ]
density of silver = 10.49g/cm³
the length of the cube's side = ?
v=m/ρ
l³ = 21×10³ /10.49 ≈ 2×10³ cm³
l =∛(2×10³)cm³
l = 1.26 ×10 = 12.6 cm
l = 4.96 inches [∵ 1 cm = 0.394 inch ]
the length of the cube's side is 4.96 inches
to know more about density :
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That would be false
Hope this helps :)
Answer:
False
Explanation:
It is a vector because of the acceleration being a vector. F=ma.
Information provided:
Length of wire, L = 320 m
Current through the wire, I = 120 Amps
Earth's magnetic field acting on the wire, B = 5.0*10^-5 T
Angle at which the magnetic field acts, Ф = 60°
By definition;
Force on the wire, F = LBI Sin Ф
Substituting;
F = 320*5*10^-5*120*Sin 60 = 1.663 N
Radius of curvature<span> of a spherical mirror = 2 × </span>Focal length<span>
and the ray of light is parallel to the principle axis if the incident </span><span>Passes through focus
therefore, focal length =30/2=<span>15cm
</span></span><span>The mirror should be placed at a distance of 15cm from the light bulb to produce this parallel light beam.</span>