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2 years ago

A car is traveling at 20 km in 15 minutes. What is its average velocity

Physics

1 answer:

yarga [219]2 years ago

7 0

The velocity is 4374.45 m/s.
I got the answer by using v=d/t.
20,000meters / 25min= 4,374.45 m/s.

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The earth makes one complete revolution around the sun in 365.24 days. Assuming that the orbit of the earth is circular and has

Anni [7]

Answer:

The magnitudes of the speed and acceleration of the Earth are approximately 66,661.217 miles per hour and 47.782 miles per square hour, respectively.

Explanation:

Given that the Earth has a circular orbit and make a revolution at constant speed around the Sun. Then, the kinematic formulas for the speed and acceleration of the planet are, respectively:

Speed

$v = \frac{2\pi\cdot R}{T}$ (1)

Acceleration

$a = \frac{4\pi^{2}\cdot R}{T^{2}}$ (2)

Where:

$v$ - Speed of the planet, measured in miles per hour.

$a$ - Acceleration of the planet, measured in miles per square hour.

$R$ - Radius of the orbit, measured in miles.

$T$ - Period of rotation, measured in hours.

If we know that $R = 93,000,000\,mi$ and $T = 8,765.76\,h$ , then the magnitudes of the speed and acceleration of the planet is:

$v = \frac{2\pi\cdot (93,000,000\,mi)}{8,765.76\,h}$

$v \approx 66,661.217\,\frac{mi}{h}$

$a = \frac{4\pi^{2}\cdot (93,000,000\,mi)}{(8,765.76\,h)^{2}}$

$a\approx 47.782\,\frac{mi}{h^{2}}$

The magnitudes of the speed and acceleration of the Earth are approximately 66,661.217 miles per hour and 47.782 miles per square hour, respectively.

3 0

3 years ago

What are (a) the lowest frequency, (b) the second lowest frequency, and (c) the third lowest frequency for standing waves on a w

Tatiana [17]

Answer:

$a. \ f_1=7.9057Hz\\\\b. \ f_2=15.8114Hz\\\\c. \ f_3=23.7171Hz$

Explanation:

a. The wire's length is 10m long and has a mass 100g and a tension of 250N.

Frequency is given by the equation:

$f=\frac{nv}{2L}\\\\=\frac{n}{2L}\sqrt{\frac{t}{\mu}$ #where t=250N*10=2500N, $\mu=0.1kg$

#substitute for actual values for the lowest frequency.

$F=\frac{n}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=\frac{1}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=7.9057Hz$ #n=1, lowest frequency

Hence, the lowest frequency for standing waves is 7.9057Hz

b.The wire's length is 10m long and has a mass 100g and a tension of 250N.

Frequency is given by the equation:

$f=\frac{nv}{2L}\\\\=\frac{n}{2L}\sqrt{\frac{t}{\mu}$ #where t=250N*10=2500N, $\mu=0.1kg$

#The second lowest frequency happens at $n=2$ :

$F=\frac{n}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=\frac{2}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=15.8114Hz$

Hence, the second lowest frequency is 15.8114Hz

c.Given that the wire's length is 10m long and has a mass 100g and a tension of 250N.

Frequency is given by the equation:

$f=\frac{nv}{2L}\\\\=\frac{n}{2L}\sqrt{\frac{t}{\mu}$ #where t=250N*10=2500N, $\mu=0.1kg$

The third lowest frequency happens at $n=3$

$F=\frac{n}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=\frac{3}{2\times 10m}\times \sqrt{2500N/0.1kg}\\=23.7171Hz$

Hence, the third lowest frequency is 23.7171Hz

6 0

3 years ago

Which of of the following is a physical change ice melting into a puddle of water,Leaves changing color in fall, Or baking a cak

Tom [10]

Answer:

ice melting

Explanation:

Because once it melts you can change it back to ice.

4 0

3 years ago

anastassius [24]

Answer:

the answer is c

Explanation:

7 0

3 years ago

Could someone ples help

natulia [17]

Yes because it helps them locate their position and direction

5 0

3 years ago

Read 2 more answers