What is the specific definition of energy that relates it to work?

a rugby player passes the ball 5.34 m across the field, where it is caught at the same height as it left his hand. at what angle

MakcuM [25]

Answer:

$31.035^{\circ}$

Explanation:

x = Displacement in x direction = 5.34 m

t = Time taken to travel the displacement

y = Displacement in y direction = 0

u = Initial velocity of ball = 7.7 m/s

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

Displacement in x direction is given by

$x=u\cos\theta t\\\Rightarrow t=\dfrac{5.34}{7.7 \cos\theta}$

Displacement in y direction is given by

$y=u\sin\theta t-\dfrac{1}{2}gt^2\\\Rightarrow 0=7.7\sin\theta \dfrac{5.34}{7.7\cos\theta}-\dfrac{1}{2}\times 9.81 (\dfrac{5.34}{7.7\cos\theta})^2\\\Rightarrow 0=7.7\sin\theta-4.905\times \dfrac{5.34}{7.7\cos\theta}\\\Rightarrow 0=7.7^2\sin\theta \cos\theta-4.905\times 5.34\\\Rightarrow 0=7.7^2\dfrac{\sin2\theta}{2}-4.905\times 5.34\\\Rightarrow 0=7.7^2\sin2\theta-4.905\times5.34\times 2\\\Rightarrow \sin2\theta=\dfrac{4.905\times 5.34\times 2}{7.7^2}\\\Rightarrow 2\theta=\sin^{-1}\dfrac{4.905\times 5.34\times 2}{7.7^2}$

$\Rightarrow \theta=\dfrac{62.07}{2}\\\Rightarrow \theta=31.035^{\circ}$

The angle at which the ball was thrown is $31.035^{\circ}$ .

7 0

3 years ago

Based on what you have learned in previous chapters, which of the following measurements would we use to determine which galaxie

andriy [413]

Answer:

the answer es c, the doppler Shift of spectral lines within the galaxy's spectrum

Explanation:

This is due to redshift, red approach or redshift, occurs when electromagnetic radiation, usually visible light, which is emitted or reflected from an object, is shifted to red at the end of the electromagnetic spectrum. More generally, redshift is defined as an increase in the wavelength of electromagnetic radiation received by a detector compared to the wavelength emitted by the source. This increase in wavelength corresponds to a decrease in the frequency of electromagnetic radiation. Instead, the decrease in wavelength is called blue shift. Any increase in wavelength is called "redshift", even if it occurs in electromagnetic radiation of non-visible wavelengths, such as gamma rays, X-rays and ultraviolet radiation. This designation can be confusing since at longer wavelengths than red (eg infrared, microwave and radio waves), "redshifts" move away from the red wavelength. So when talking about frequencies of waves smaller than red continues to mean that the wavelength tends to lengthen and not resemble red.

A redshift can occur when a light source moves away from an observer, corresponding to a Doppler shift that changes the perceived frequency of the sound waves. Although the observation of such redshifts, or their counterpart, towards blue, has numerous terrestrial applications (eg Doppler radar and radar gun), astronomical spectroscopy uses Doppler redshifts to determine the movement of distant astronomical objects. This phenomenon was first predicted and observed in the 19th century when scientists began to consider the dynamic implications of the wave nature of light.

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3 years ago

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Based on the data in the table, what will happen when a sound wave travels from copper into lead?

Lynna [10]

Answer:

A i believe

Explanation:

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Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a

Mumz [18]

The animal cell and the plant cell have some organelles in common but there are some organelles that belong to only one of the cell. In the question given here, mitochondria, cillia and ribosomes are found in both plant and animal cells. The cell wall is found only in the plant cell. So, the correct option is C.

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4 years ago

Yesenia wants to bake cookies in her electric oven. The oven will transform electrical energy into ________ energy

galina1969 [7]

The answer is heat. The oven will transform electrical energy into heat energy. :)

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3 years ago

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