<span>Dark matter is a type of matter distinct from baryonic matter</span>
64km/hr
if it takes .25 hrs to travel 16km you would be traveling 16km every .25hrs, but you need it in km/hr so you multiply .25 by 4 and 16 by 4. you get 64km/hr
The atoms which make up the ion are covalently bonded to one another. 19) It is possible for a compound to possess both ionic and covalent bonding. a. If one of the ions is polyatomic then there will be covalent bonding within it.
Answer:
Explanation:
Torque due to applied force along its surface is given as
here we know that
r = radius of earth =
Now we have
now we know that
initial angular speed of Earth is
final angular speed will be
so now we have
here we have moment of inertia of Earth is given as
now we have
Answer:
α = 2,857 10⁻⁵ ºC⁻¹
Explanation:
The thermal expansion of materials is described by the expression
ΔL = α Lo ΔT
α =
in the case of the bar the expansion is
ΔL = L_f - L₀
ΔL= 1.002 -1
ΔL = 0.002 m
the temperature variation is
ΔT = 100 - 30
ΔT = 70º C
we calculate
α = 0.002 / 1 70
α = 2,857 10⁻⁵ ºC⁻¹