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3 years ago

A car moves along a straight path with a speed of 30kmh. How much distance will the car travel in 20 minutes

Physics

1 answer:

san4es73 [151]3 years ago

3 0

Answer:

$speed \: = \frac{distance}{time} \\ speed \times time = distance \\ 8.3ms^{ - 1} \times 1200s \\ 9960m$

30km/h = 8.3ms^-1

20min = 1200s

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Answer:

(a)2.865 s

(b)2.865 s

Explanation:

We are given that

Acceleration,a= $3.49 m/s^2$

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$t=\frac{v-u}{a}$

Using the formula

$t=\frac{39-29}{3.49}=2.865 s$

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Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth’s center. Satellite A is to o

Vera_Pavlovna [14]

Answer:

Explanation:

Orbital radius of satellite A , Ra = 6370 + 6370 = 12740 km

Orbital radius of satellite B , Rb = 6370 + 19110 = 25480 km

Orbital potential energy of a satellite = - GMm / r where G is gravitational constant , M is mass of the earth and m is mass of the satellite

Orbital potential energy of a satellite A = - GMm / Ra

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PE of satellite B /PE of satellite A

= Ra / Rb

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b ) Kinetic energy of a satellite is half the potential energy with positive value , so ratio of their kinetic energy will also be same

KE of satellite B /KE of satellite A

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a crude approximation of voice production is to consider the breathing passages and mouth to be a resonating tube closed at one

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The fundamental frequency of the tube is 0.240 m long, by taking air temperature to be $37^o$ C is 367.42 Hz.

A standing wave is basically a superposition of two waves propagating opposite to each other having equal amplitude. This is the propagation in a tube.

The fundamental frequency in the tube is given by

$f=\frac{v_T}{4L}$

where, $v_T=v\sqrt{\frac{T}{273} }$

Since, T=37+273 K = 310 K

v = 331 m/s

$\therefore v_T=331\sqrt{\frac{310}{273} } = 352.72 \ m/s$

Using this, we get:

$f=\frac{352.72}{4(0.240)} \\f=367.42 \ Hz$

Hence, the fundamental frequency is 367.42 Hz.

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3 years ago

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A car moves along a straight path with a speed of 30kmh. How much distance will the car travel in 20 minutes​

A car moves along a straight path with a speed of 30kmh. How much distance will the car travel in 20 minutes