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4 years ago

The image shows how Earth orbits the Sun. Points W and X are the same distance from the Sun.

Physics

2 answers:

Andrej [43]4 years ago

6 0

Answer:

C. The speed of Earth is the same at W as at X because the force on Earth is the same as W as X

Explanation:

got right on Edge

Ksju [112]4 years ago

4 0

Answer:

This figure shows the Second Kepler’s Law of Planetary Motion, The line that joins the planet with the Sun sweeps equal areas in equal times.

According to this statement, the only way in which this is fulfilled is that the planet moves faster when it is near the sun (perihelion) and moves slower when it is far from the Sun (aphelion).

In the image shown, if points W and X are at the same distance to the Sun, this means the instantaneous velocity of the planet in both points is the same.

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4 years ago

An adiabatic closed system is accelerated from 0 m/s to 34 m/s. Determine the specific energy change of this system, in kJ/kg.

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Answer:

Δe=0.578 kJ/kg

Explanation:

Given data

Velocity v₁=0 m/s

Velocity v₂=34 m/s

to find

Specific energy change Δe

Solution

The specific energy change is simply determined from change in velocity

Δe=(v₂²-v₁²)/2

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Δe=0.578 kJ/kg

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3 years ago

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It is August 1st and you are at a Science Camp in Florida. During an outdoor science quiz, you are asked to identify the tempera

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3 years ago

A rotating fan completes 1200 revolutions every minute. Consider the tip of a blade, at a radius of 0.15 m. (a) Through what dis

olga55 [171]

Answer:

(a) 0.942 m

(b) 18.84 m/s

(d) 0.05 s

Explanation:

(a) In one revolution, it travels through one circumference, 2πr = 2 × 3.14 × 0.15 m = 0.942 m.

(b) Its frequency, f, is 1200 rev/min = $\dfrac{1200}{60}$ rev/s = 20 rev/s.

Its angular frequency, ω = 2πf = 2π × 20 = 40π

The speed is given by

v = ωr = 40π × 0.15 = 6π = 18.84 m/s

(d) The period is the inverse of the frequency because it is the time taken to complete one revolution.

$T = \dfrac{1}{f}$

T = 1/20 = 0.05 s

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3 years ago