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4 years ago

Describe the motion above and answer

Physics

1 answer:

amm18124 years ago

7 0

Answer:

mmmmmmmm

Explanation:

mmmmmmmmmmmmmmmmmmmm

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You are driving at 75 km/h. Your sister follows in the car behind at 75 km/h. When you honk your horn, your sister hears a frequ

OLga [1]

The ideal concept for solving this question is based on the Doppler effect, for which it is indicated that the source's listening frequency changes as the distance and the relative speed between the receiver and the transmitter are also changed. However, if the relative velocity between the two objects is zero as in the particular case presented (since both travel at 75km / h) we have that there will be no change in frequency.

Therefore the frequency that I hear and that my sister would listen would be the same.

5 0

4 years ago

A boat has a velocity of 5m/s North with respect to a river. It aims to reach point A, directly north across the river, which is

Juli2301 [7.4K]

What are the answer

Need the answers

6 0

3 years ago

A friend returns to the United states from Europe with a 960 W coffee maker, designed to operate from a 240 V line. What can she

Paladinen [302]

Answer:

$\frac{N_2}{N_1}= 2$

Explanation:

From the question we are told that:

Power $W=960W$

Voltage $V=240v$

USA-standard $V_{usa}=120 V$

Applying A step down transformer

Generally the equation for a Transformer is mathematically given by

$\frac{v_2}{v_1}c=\frac{N_2}{N_1}$

$\frac{N_2}{N_1}=\frac{240}{120}$

$\frac{N_2}{N_1}= 2$

Therefore

She can use a turns ratio of 2

8 0

3 years ago

Consider the possibility of using two rotating cylinders to replace the conventional wings on an airplane for lift. Consider an

EleoNora [17]

Answer:

27.35m

Explanation:

For the calculation of the Support Force we rely on the formula for obtaining the force in a cylinder of a certain length l,

$F_y = - \rho Ul\Gamma$

Here each term is,

$F_y$ = Lift force

$\rho$ = density of air

$\Gamma$ = vortex strength

For this last equation, its mathematical representation is given by,

$\Gamma = 2\pi av_{\theta}$

Here each term is,

a= 1m, radios of cylinder

$v_{\theta}= 20 Km/hr=5.5m/s$ , the velocity of cylinder surface.

$\Gamma = 2\pi (1)(5.5) = 34.90m^2/s$

In order to find the density of the area at 2000m we will refer to the table of Standard Atmosphere of the United States, that is $1.007kg/m^3,$

$U= 150Km/hr = 41.6m/s, F_y = 40000N, \Gamma = 34.90m^2/s$

Replacing the values,

$40000 = -(1.007)(41.6)l(34.90)$

Clearing l and solving for it we have,

$l=-27.35m$

<em>In this way we can conclude that the length of the cylinder must be 27.35m</em>

7 0

4 years ago

How do you think scientists figure out what they think the population will be in 2050?

laila [671]

They would most likely use statistics on the increase/decrease in population from previous decades and centuries. In addition to these statistics, they could use the birth and death rate and ultimately predict the increase within these next 30 years. They must also take climate change and other environmental factors into consideration when formulating such a bold prediction.

4 0

4 years ago