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3 years ago

12

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2 answers:

Liono4ka [1.6K]3 years ago

7 0

Answer:

is there answer choices?

Explanation:

vesna_86 [32]3 years ago

5 0

Is there any answers given or is this all in your textbook or lessons?

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State keplers law........

S_A_V [24]

Answer:

There are actually three, Kepler's laws that is, of planetary motion: 1) every planet's orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its

4 0

3 years ago

An airplane is flying at 300 mi/h at 4000 m standard altitude. As is typical, the air velocity relative to the upper surface of

posledela

Answer:

57330.17766 Pa

Explanation:

$P_1$ = Pressure at 4000 m = 61660 Pa

$\rho$ = Density at 4000 m = 0.8194 kg/m³

(Values taken from table of properties of air)

$V_1$ = Velocity of jet = $300\times \frac{1609.34}{3600}=134.11\ m/s$

$V_2$ = Velocity at max thickness

$V_2=1.26V_1=1.26\times 134.11=168.9786\ m/s$

From Bernoulli's equation

$P_1+\frac{1}{2}\rho V_1^2=P_2+\frac{1}{2}\rho V_2^2\\\Rightarrow P_2=P_1+\frac{1}{2}\rho V_1^2-\frac{1}{2}\rho V_2^2\\\Rightarrow P_2=61660+\frac{1}{2}\times 0.8194\times 134.11^2-\frac{1}{2}\times 0.8194\times 168.9786^2\\\Rightarrow P_2=57330.17766\ Pa$

The absolute pressure at this point on the wing is 57330.17766 Pa

3 0

4 years ago

Why does a car move forward while traveling on a road, even though its wheels are equipped to spin backwards?

Alex787 [66]

Because the car has more mass than the wheel spinning backwards

5 0

4 years ago

Read 2 more answers

How much heat is absorbed by 20g granite boulder as enegry from the sun causes its temperature to change from 10 celsius to 29 c

pochemuha

m = mass of granite boulder = 20 g

c = specific heat of granite boulder = 0.79 J/gC

T₀ = initial temperature of granite boulder = 10 °C

T = final temperature of granite boulder = 29 °C

Q = heat gained by granite boulder as energy from the sun

heat gained by granite boulder is given as

Q = m c (T - T₀)

inserting the values

Q = (20) (0.79) (29 - 10)

Q = 300.2 J

6 0

3 years ago

A scientist is testing the seismometer in his lab and has created an apparatus that mimics the motion of the earthquake felt in

otez555 [7]

Complete Question

The complete question is shown on the first uploaded image

Answer:

a

$a_{max} = 0.00246 \ m/s^2$

b

$k =722.2 \ N/m$

Explanation:

From the question we are told that

The amplitude is $A = 1.8 \ cm = 0.018 \ m$

The period is $T = 17 \ s$

The test weight is $W = 13 \ N$

Generally the radial acceleration is mathematically represented as

$a = w^2 r$

at maximum angular acceleration

$r = A$

So

$a_{max} = w^2 A$

Now $w$ is the angular velocity which is mathematically represented as

$w = \frac{2 * \pi }{T}$

Therefore

$a_{max} = [\frac{2 * \pi}{T} ]^2 * A$

substituting values

$a_{max} = [\frac{2 * 3.142}{17} ]^2 * 0.018$

$a_{max} = 0.00246 \ m/s^2$

Generally this test weight is mathematically represented as

$W = k * A$

Where k is the spring constant

Therefore

$k = \frac{W}{A}$

substituting values

$k = \frac{13}{0.018}$

$k =722.2 \ N/m$

7 0

4 years ago