Know? Like to know? Learned physical science chapter 16

In what ways are sound waves and electromagnetic waves different?

Veseljchak [2.6K]

Choice-A is a false statement, and the other three choices are absurdly untrue and physically impossible. None of the choices is an applicable response to the question.

8 0

4 years ago

Choose the statements that correctly describe a scientific theory. Select all that apply.

Basile [38]

The statement that correctly describes a scientific theory is option b.

A scientific theory is a thorough justification for a certain phenomenon in the natural world that is based on a body of data that has been repeatedly confirmed via observation and experiment. These concepts are accurate explanations of reality rather than just "guesses." It is possible to test scientific hypotheses and produce predictions that can be refuted.
Option a is incorrect because a scientific theory is supported by data and evidence.
Option c is incorrect because a scientific theory is not based on opinions but rather facts.
Option d is incorrect because a scientific theory is not likely to change over time with new incoming data.

To learn more about scientific theory visit :

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4 0

2 years ago

The three forces shown act on a particle. what is the direction of the resultant of these three forces?

melisa1 [442]

Missing figure: http://d2vlcm61l7u1fs.cloudfront.net/media/f5d/f5d9d0bc-e05f-4cd8-9277-da7cdda3aebf/phpJK1JgJ.png

Solution:
We need to find the magnitude of the resultant on both x- and y-axis.

x-axis) The resultant on the x-axis is
$F_x = 65 N\cdot cos 30^{\circ} - 30 N - 20 N\cdot sin 20^{\circ} = 19.45 N$
in the positive direction.

y-axis) The resultant on the y-axis is
$F_y = 65 N \cdot sin 30^{\circ} - 20 N \cdot cos 20^{\circ} = 13.70 N$
in the positive direction.

Both Fx and Fy are positive, so the resultant is in the first quadrant. We can find the angle and so the direction using
$\tan \alpha = \frac{F_y}{F_x} = \frac{13.70 N}{19.45 N}=0.7$
from which we find
$\alpha=35^{\circ}$

7 0

4 years ago

Help needed

MakcuM [25]

Answer: Atmosphere and geosphere.

Geo-sphere is the solid part of the earth. Hydrosphere is the water part. The living things on the earth make up the biosphere. The gases, water vapors etc make up the atmosphere. When a volcanic eruption adds carbon dioxide to the air, the carbon-dioxide is being added from geosphere to the atmosphere. Hence, there is interaction between atmosphere and geosphere.

6 0

4 years ago

Particles of m1 and m2 (m2>m1) are connected by a line in extensible string passing over a smooth fixed pulley. Initially, bo

Tresset [83]

Answer:

The velocity with which the mass will hit the floor is $v_f = \sqrt{2(\dfrac{m_2-m_1}{m_2+m_1}) x.}$

Explanation:

If the tension in the string is $T$ , for $m_1$ we have

$T- m_1g =m_1a$ ,

and for the mass $m_2$

$T -m_2g = -m_2a$

From these equations we solve for $a$ and get:

$a =(\dfrac{m_2-m_1}{m_2+m_1}) g.$

The kinematic equation

$v_f^2 = v_0^2+2ax$

gives the final velocity $v_f$ of a particle, when its initial velocity was $v_0$ , and has traveled a distance $x$ while undergoing acceleration $a$ .