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3 years ago

What is the quantity of matter that an object contains called? A. mass B. weight C. volume D. density

Physics

1 answer:

Setler79 [48]3 years ago

3 0

The answer would be A) Mass

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What is the frequency of an electromagnetic wave if it has a wavelength of 1.1 km? The speed of light is 3 × 108 m/s. Answer in

stepladder [879]

Answer: $f=272727.272Hz$

Explanation:

The speed of light (electromagnetic wave) is given by the following formula:

$c=f.\lambda$ (1)

Where:

$c=3(10)^{8}\frac{m}{s}$ is the speed of light

$f$ the frequency

$\lambda=1.1km=1100m$ the wavelength

So, we have to find $f$ from (1):

$f=\frac{c}{\lambda}$ (2)

$f=\frac{3(10)^{8}\frac{m}{s}}{1100m}$

<u>Finally:</u>

<u></u>

$f=272727.272\frac{1}{s}$

Knowing $1Hz=\frac{1}{s}$

$f=272727.272Hz$

5 0

4 years ago

What is the major energy resource used to generate electricity around the globe and why?

Mazyrski [523]

Worldwide, coal is, because it's cheap, plentiful, easy to obtain, easy to transport, easy to store, easy to handle, carries lots of chemical energy, burns easily, and neither it nor its waste products are immediately and obviously toxic or deadly.

6 0

3 years ago

Violins,guitars, and harps produce sound by vibrating membranes....true/false

ikadub [295]

False. They're vibrating strings. Drums have membranes (a membrane is like a sheet)

7 0

3 years ago

a football is thrown upward at a 31° angle to the horizontal.the acceleration of gravity is 9.8m/s^2. To throw the ball a distan

mr Goodwill [35]

The ball's vertical position $y$ in the air at time $t$ is

$y=v_0\sin31^\circ\,t-\dfrac g2t^2$

The ball is at its original height when $y=0$ , which happens at

$v_0\sin31^\circ\,t-\dfrac g2t^2=\dfrac t2\left(2v_0\sin31^\circ-gt)=0$

$\implies t=0\text{ and }t=\dfrac{2v_0\sin31^\circ}g$

Meanwhile, the ball's horizontal position $x$ at time $t$ is

$x=v_0\cos31^circ\,t$

So when the ball reaches its original height a second time, the ball will have traveled a horizontal distance of

$x=\dfrac{2{v_0}^2\sin31^\circ\cos31^\circ}g=\dfrac{{v_0}^2\sin(2\cdot31^\circ)}g$

(which you might recognize as the formula for the range of a projectile)

To reach a distance of $x=77\,\rm m$ , the initial speed $v_0$ would be

$77\,\mathrm m=\dfrac{{v_0}^2\sin62^\circ}{9.8\,\frac{\rm m}{\mathrm s^2}}\implies v_0=29\dfrac{\rm m}{\rm s}$

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3 years ago

How is Aristotles model similar to Ptolemy’s model

Margarita [4]

I'm assuming you mean models of the solar system:

Both Aristotle and Ptolemy had the idea that the solar system was geocentric. This means that all objects in the solar system including the Sun revolve around the Earth.

4 0

4 years ago

Read 2 more answers