Answer:
<em>The Answer to question 14 is : glycerol (n=1.47)</em>
Answer:
Explanation:
International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine standard units.
Answer:
x_total = 0.17m
Explanation:
We can treat this exercise with the kinematics equations, where in the first part it is accelerated and in the second it is a uniform movement.
Let's analyze accelerated motion
The time that lasts is t = 20 10⁻³ s, the initial speed is zero (v₀ = 0), let's find the length that advances
x₁ = v₀ t + ½ a t²
x₁ = ½ a t²
x₁ = ½ 210 (20 10⁻³)²
x₁ = 4.2 10⁻² m
let's find the speed for the end of this movement
v = v₀ + a t
v = 0 + 210 20 10⁻³
v = 4.2 m / s
with this speed we can find the distance that the uniform movement
x₂ = v t2
x₂ = 4.2 30 10⁻³
x₂ = 1.26 10⁻¹ m
x₂ = 0.126m
the total distance traveled is
x_total = x₁ + x₂
x_total = 0.0420 +0.126
x_total = 0.168m
Let's reduce the significant figures to two
x_total = 0.17m
Answer:
A)
2. very cool but very luminous
6. found in the upper right of the H-R diagram
B)
1. The majority of stars in our galaxy
5. the Sun, for example
7. a very hot and very luminous star
C)
3. not much larger in radius than Earth
4. very hot but very dim
Explanation:
Main-sequence stars :
Main-sequence stars are the star which having hydrogen in the core and also having stable inward and outward force.
White dwarfs :
This is also a star like the sun .The temperature of these type of star above 100,000 Kelvin.The mass of White dwarfs is less than the sun but slightly more than earth.
Red giant or supergiant stars :
This is the biggest star in the universe.When a star does not having hydrogen fuel in the core then Red giant or supergiant stars are formed.
A) 2 ,6
B) 1 , 5 ,7
C) 3 ,4
Answer:
The reason is similar to the reason why it is difficult to roll an object on a surface with a positive incline than rolling it on the ground
The more the path becomes vertical, the more force we have to apply to oppose the force of gravity
but when we are moving horizontally, we don't have to move against the gravity and hence, it is less difficult than going vertically upwards