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3 years ago

3. Why is the term cold blooded a misconception? Explain

Physics

1 answer:

jok3333 [9.3K]3 years ago

7 0

Answer:

The term “cold-blooded” implies that these animals are in a never-ending struggle to stay warm. That really isn't correct. A cold-blooded animal can warm up their blood by being in the sun for hours.

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Process of Science Task: Earth-Centered vs. Sun-Centered Models.

Gnoma [55]

Answer:

There are a number of models as explained below.

Explanation:

Depending on the position of the earth in the orbit, stars will be in different positions relative to the distant stars.

This model can be explained by the parallax effect. An object is viewed differently by the left and the right eye.

Reference can be made to the geocentric and heliocentric arguments. The first view argues that heavens are composed of 55 concentric spheres.

On the other hand, the heliocentric system, proposed by Copernicus, suggested that the Sun, not the earth, was the center of the solar system.

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4 years ago

50 POINTS PLZZ ANSWER

LekaFEV [45]

The Coordinate Methodology is a technique for converting geometrical images into formulas, a technique for describing visuals with letters and numbers representing constant and factors. It is essential in learning calculus and other mathematical topics, and the further calculation can be defined as follows:

$\to \bold{A(0,0)}\\\\\to \bold{B(100,0)}\\\\$

So,

$\to \bold{C:(100,-200)}\\\\\to \bold{D: (100-75\sqrt{3},-275)}\\\\\to \bold{E: (-25-75\sqrt{3},-125\sqrt{3}-275)}\\\\$

calculating the E distance A:

$\to \bold{\sqrt{(-25-75\sqrt{3})^2+ (125\sqrt{3}- 275)^2}}\\\\\to \bold{ 25\sqrt{(225-104\sqrt{3})}}\approx 167.46\ m\\\\$

In this question, by using the coordinates method to calculate the distance from the start point to the end point.

Please find the graph in the attached file.

Learn more:

brainly.com/question/21864093

5 0

3 years ago

Someone drops a 50 − g pebble off of a docked cruise ship, 70.0 m from the water line. A person on a dock 3.0 m from the water l

alexira [117]

Answer:

a) The work done on the pebble is 32.9 J.

b) The change in the gravitational potential energy is -32.9 J.

c) When the pebble is dropped, the potential energy is 34.3 J.

d) When the pebble reaches the net, the potential energy is 1.47 J.

e) If the potential energy is 30.0 J at water level, it will be 31.47 J at the net and 64.3 J at 70.0 m.

Explanation:

a) The work done by the gravity force can be calculated using the following equation:

W = F · Δy

Where:

W = work

F = gravity force

Δy = vertical displacement (final height - initial height)

The gravity force can be calculated as:

F = m · g

Where:

F = gravity force

m = mass

g = acceleration due to gravity (-9.81 m/s² considering the upward direction as positive).

Then, the work done on the pebble by the gravity force will be:

W = m · g · (hf - hi) (hf = final height, hi = initial height)

W = 0.050 kg · (-9.81 m/s²) · (3.0 m - 70.0 m)

W = 32.9 J

The work done on the pebble is 32.9 J.

(Notice that the work is positive. That means that the force that does the work is in the same direction as the movement).

b) The potential energy (EP) can be calculated as follows:

EP = m · g · h (h = height)

The change in the gravitational potential energy is calculated as the difference of the potential energy between the two positions:

ΔEP = EPf - EPi

Where:

ΔEP = change in the gravitational potential energy.

EPf = final potential energy.

EPi = initial potential energy.

Then:

ΔEP = EPf - EPi

ΔEP = (0.050 kg · 9.81 m/s² · 3.0 m) - (0.050 kg · 9.81 m/s² · 70.0 m)

ΔEP = -32.9 J

c) When the pebbel is dropped, the potential energy will be:

EP = m · g · h

EP = 0.050 kg · 9.81 m/s² · 70.0 m = 34.3 J

d) When it reaches the net h = 3.0 m. Then:

EP = 0.050 kg · 9.81 m/s² · 3.0 m = 1.47 J

e) We have to add 30 J to the potential energy values calculated above:

The potential energy at 70.0 m will be: 34.3 J + 30 J = 64.3 J

The potential energy at 3.0 m will be: 1.47 J + 30 J = 31.47 J

6 0

3 years ago

Para fabricar la bicicleta de un niño pequeño se tiene en cuenta que la fuerza que puede desarrollar es menor que la de un adult

Georgia [21]

Answer:

a) El piñón debe tener 20 dientes.

b) La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

Explanation:

a) El plato es el engranaje más grande que forma parte del sistema de transmisión, acompañando a la cadena y el piñón integrado a la rueda trasera. Asumiendo que no existen pérdidas por fricción seca y que las condiciones de lubricación del sistema de transmisión son óptimas tal que las pérdidas de potencia son despreciables. Además, supongamos que la bicicleta viaja a velocidad constante, entonces tenemos la siguiente identidad mediante las definiciones de trabajo y potencia:

$T_{P}\cdot \omega_{P} = T_{p}\cdot \omega_{p}$ (1)

Donde:

$T_{P}$ - Torque del plato, en newton-metros.

$T_{p}$ - Torque del piñón, en newton-metros.

$\omega_{p}$ - Rapidez angular del piñón, en radianes por segundo.

$\omega_{P}$ - Rapidez angular del plato, en radianes por segundo.

Sabiendo el hecho que tanto el plato y el piñón experimenta la misma velocidad tangencial, podemos simplificar (1) como sigue:

$\frac{T_{P}}{R_{P}} = \frac{T_{p}}{R_{p}}$ (1b)

Puesto que el radio de cada elemento y el número de dientes son, por separado, directamente proporcionales al número de dientes, modificamos (1b) así y tenemos la siguiente identidad, la cual equivale a su vez a la razón de desarrollo:

$\frac{T_{P}}{T_{p}} = \frac{N_{P}}{N_{p}} = \frac{R_{P}}{R_{p}} = \frac{\omega_{p}}{\omega_{P}}$ (1c)

Donde:

$N_{p}$ - Número de dientes del piñón, sin unidad.

$N_{P}$ - Número de dientes del plato, sin unidad.

Si tenemos que $r = 1,4$ y $N_{P} = 28$ , entonces tenemos que el número de dientes del piñón es:

$r = \frac{N_{P}}{N_{p}}$

$N_{p} = \frac{N_{P}}{r}$

$N_{p} = \frac{28}{1,4}$

$N_{p} = 20$

El piñón debe tener 20 dientes.

b) De acuerdo con la relación de desarrollo, por cada revolución realizada por el plato, el piñón realiza 1,4 revoluciones. Entonces, el avance realizado por la rueda trasera ( $s$ ), en metros, es igual al productor de la relación de desarrollo y la circunferencia de la rueda, es decir:

$s = r\cdot 2\pi\cdot R$ (1)

Donde $R$ es el radio de la rueda trasera, en metros.

Si conocemos que $r = 1,4$ y $R = 0,2\,m$ , entonces el avance realizado por la rueda trasera es:

$s = r\cdot 2\pi\cdot R$

$s = (1,4)\cdot (2\pi)\cdot (0,2\,m)$

$s \approx 1,759 \,m$

La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

3 0

3 years ago

Suppose that aliens from a planet orbiting Betelgeuse have eyes similar to human eyes, except that the diameter of their pupils

slega [8]

Answer:

Answered

Explanation:

The data given in the problem

Diameter of a human pupil=0.007 m=7 mm

Diameter of alien pupil=0.5=500 mm

Here we have to calculate the minimum distance at which the alien can see Betelgeuse i.e. the focal length (or the working distance). For this calculation we assume the eye to be a spherical lens.

The focal length and diameter of the lens are related by the formula $F=\frac{r}{2}$ Where r is radius of curvature i.e. d/2

Therefore for the alien, focal length= $F=\frac{25}{2}=12.5mm=0.0125F=\frac{25}{2}$ =12.5mm=0.0125

7 0

3 years ago

3. Why is the term cold blooded a misconception? Explain​

3. Why is the term cold blooded a misconception? Explain