A passenger plane is flying above the ground.Describe the two components of its mechanical enserfy

1. Order the materials from smallest refractive index to largest refractive index.

slavikrds [6]

Air = 1

Water = 1.33

Glass = 1.52

Quartz = 1.46

Diamond = 2.42

3 0

3 years ago

Suppose that you and three classmates are discussing the design of a roller coaster. One says that each hill must be lower than

8_murik_8 [283]

Answer:

I would say that I agree with the one that said that each hill must be lower than the previous one and use the principle of conservation of energy to explain.

Explanation:

Roller coaster are usually designed such that its total energy remains conserved at any point on the track. Now, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. At certain height on the track, the total energy of the roller coaster is in form of potential energy, which gets converted to kinetic energy as soon as it starts sliding down the hill till get to the hill's endpoint where it has maximum kinetic energy. The cycle of sliding from a high point on the track to a low point on the track means there is potential energy is converted to kinetic energy and kinetic energy then converts back to potential energy and the cycle continues.

However, due to the effect of gravity and frictional force between the track and the coaster, the energy of the coaster is gradually reduces, so it becomes a bit difficult for the coaster to move to the next hill of the same height. It is for this reason that each hill must be lower than the previous one, so that the coaster can overcome the next hill's height with its reduced energy until it loses all its energy and comes to a stop.

4 0

3 years ago

Please help me feel out this paper. Very hard for me to figure thu

Anastaziya [24]

Tension is the force causing the path. It is always directed inward for circular motion. To hit the ceiling you need B. The stopper will travel along the tangent line it was moving when released (when tension goes to 0). This is upward in B so it will keep going up to the ceiling.
The velocity is pointed along the tangent line at all times (parallel to the edge of the circle at any point)

5 0

4 years ago

A star with the same mass and diameter as the sun rotates about a central axis with a period of about 24.0 days. Suppose that th

Mila [183]

Answer:

a) w = 2.52 10⁷ rad / s, b) K / K₀ = 1.19 10⁴

Explanation:

a) We can solve this exercise using the conservation of angular momentum.

Initial instant. Before collapse

L₀ = I₀ w₀

Final moment. After the collapse

L_f = I w

angular momentum is conserved

L₀ = L_f

I₀ w₀ = I w (1)

The moment of inertia of a sphere is

I = 2/5 m r²

we take from the table the mass and diameter of the star

m = 1,991 10³⁰ kg

r₀ = 6.96 10⁸ m

r = 6.37 10⁶ m

to find the angular velocity let's use

w = L / T

where the length of a circle is

L = 2π r

T = 24 days (24 h / 1 day) (3600 s / 1h) = 2.0710⁶ s

we substitute

w = 2π r / T

wo = 2π 6.96 10⁸ / 2.07 10⁶

wo = 2.1126 10³ rad / s

we substitute in equation 1

w = $\frac{I_o}{I}$

w = 2/5 mr₀² / 2/5 m r² w₀

w = ( $\frac{r_o}{r}$ ) ² wo

w = (6.96 10⁸ / 6.37 10⁶) ² 2.1126 10³

w = 2.52 10⁷ rad / s

b) the kinetic energy ratio

K = ½ m w²

K₀ = ½ m w₀²

K = ½ m w²

K / K₀ = (w / wo) ²

K / K₀ = 2.52 10⁷ / 2.1126 10³

K / K₀ = 1.19 10⁴

7 0

3 years ago

Who gains altitude more quickly, a pilot traveling 400 mph and rising at an angle of 30°, or a pilot traveling 300 mph and risin

Basile [38]

The rate of altitude increase is equivalent to the vertical component of the pilot's velocity. Let the first pilot's velocity be A and the second's be B.
Ay = Asin(∅)
Ay = 400sin(30)
Ay = 200 mph

By = Bsin(∅)
By = 300sin(40)
By = 192.8 mph

200 - 192.8 = 7.2 mph
The first pilot gains altitude faster by 7.2 mph than the second pilot.

4 0

3 years ago