What does conduction require
1 answer:
You might be interested in
Answer:
Temperature -SI unit :Kelvin
Explanation:
Kelvin is the SI unit of Temperature .
- Don't get confused and write Celsius as the SI unit .Celsius is not the SI unit .
Or
Lets take an example :-
- Take 27°C
Lets convert to Kelvin scale
- SI unit of Mass=kilogram(Kg)
- SI unit of Time=second(s)
- SI unit of electric current=Ampere(A)
Answer:
7.5 kg
Explanation:
We are given that
Length of plank, l=3 m
Distance of fulcrum from one end of the plank=1 m
We have to find the mass must be on the other end if the plank remains balanced.
Let m be the mass must be on the other end if the plank remains balanced.
In balance condition
Hence, mass 7.5 kg must be on the other end if the plank remains balanced.
Answer:
v = 8.03 m / s
Explanation:
This is a missile throwing exercise.
y = y₀ + t - ½ g t²
indicates that y = -1.2 m and the initial velocity is
v_{oy} = v₀ sin θ
v_{oy} = 6.4 sin 2.2
v_{oy} = 0.2457 m / s
we substitute in the equation
-1.2 = 0.2457 t - ½ 9.8 t²
4.9 t² - 0.2457 t - 1.2 = 0
t² - 0.05014 t -0.2449 = 0
we solve the quadratic equation
t = [0.05014 ±√ (0.05014² + 4 0.2449)] / 2
t = [0.05014 ± 0.9910] / 2
t₁ = 0.5206 s
t₂ = -0.47 s
time must be a positive magnitude therefore the correct answer is
t = 0.5206 s
with this time we can calculate the vertical speed when the rock hits the ground
v_{y} = v_{oy} - gt
v_{y} = 0.2457 - 9.8 0.5206
v_{y} = -4.856 m / s
the negative sign indicates that the speed is down
horizontal velocity is constant, due to no acceleration
vₓ = v₀ₓ = v₀ cos 2,2
v₀ₓ = 6.4 cos 2.2
v₀ₓ = 6.395 m / s
therefore let's use Pythagoras' theorem to find the velocity
v = √ (vₓ² + )
v = √ (6,395² + 4,856²)
v = 8.03 m / s
the direction can be found with trigonometry
tan θ = v_{y} / vₓ
θ = tan⁻¹ (-4,856 / 6,395)
θ = - 37
the negative sign indicates that it is half clockwise from the x axis