When the source of a sound is moving it's speed increases
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whether "its speed" refers to the source or the sound.
When the source of a sound is moving relative to the listener, then
the listener may hear a higher- or lower-pitch sound than what the
source is actually emitting.
Answer:
false
Explanation:
Related Questions
How do the different forms of potential energy depend on an object's position or chemical composition?
What is absolute zero
Jake drops a book out of a window from a height of 10 meters. At what velocity does the book hit the ground? Answer choices: A: 7.0Meters/Second B: 10Meters/Second C: 14Meters/Second D: 28Meters/Second
Imagine that current is flowing couterclockwise around a squre loop of wire in front of you
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A catalytic combustor is an attachment which allows exhaust gases to be chemically broken down to release more energy. This is how it is applicable to modern fireplaces.
Answer:
catalytic combustor
Explanation:
Answers
When the igneous rock is deep underground for many years, it will form into metamorphic rock under extreme pressure and temperature. It could also form into magma when it melts deep beneath the layers of earth or it could form sediments when subjected to weather erosion.
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On Earth, the acceleration of gravity is 9.8 m/s² downward.
This means that any falling object gains 9.8 m/s of speed downward
for every second it falls.
Since the penny fell for 1.5 seconds, its downward speed at the
end of that time is (1.5 x 9.8) = 14.7 m/s faster than at the beginning
of that time.
Since it was dropped gently from somebody's hand ... and not THROWN
down ... its speed at the beginning is zero. So its speed after 1.5 seconds
is 14.7 m/s, and its velocity after 1.5 seconds is 14.7 m/s downward.
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I used the Lens Equation:
Where:
obj. is the distance of the object
im. is the distance of the image
f is the focal length
Final answer:
The image formed by the convex lens is real, located 10.91 cm to the right of the lens, and is inverted. The ray diagram would show rays from the object converging at the image point after passing through the lens.
Explanation:
In order to draw a ray diagram and find the location of the image for an object placed 30.0 cm to the left of a convex lens with a focal length of +8.0 cm, we first utilize what is known as the lens formula, which is 1/f = 1/do + 1/di. Here, f is the focal length of the lens, do is the object distance, and di is the image distance.
In the given question, the object distance (do) is -30 cm (the negative sign indicates that the object is on the same side of the lens as the light source), and the focal length (f) is +8 cm. Plugging these values into the lens equation, we find that 1/di = 1/f - 1/do = 1/8 - 1/(-30). Solving this, we get di = 10.91 cm.
This positive value for di means the image is real, meaning it can be projected onto a screen, and appears on the opposite side of the lens from where the object is. The magnitude of the image distance indicates the image is 10.91 cm from the lens.
To determine the orientation of the image, we use the magnification formula, m = -di/do. Substituting the given values into this formula, we get m = -10.91 / -30 = +0.36. Since this value is positive, the image is inverted. The image would appear smaller than the object because the absolute value of the magnification is less than 1.
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between two points. So if you want to measure the difference in electrical potential
between two points, you touch one probe of the meter to each point, and somehow
the internal guts of the meter are able to sense the difference in electrical potential
between the two points.
If the two points have non-reactive impedance (a resistance) between them, then the
difference in electrical potential between the two points, as indicated by the meter,
will be close to (resistance between the two points) x (current flowing between them).
Answers
During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.
The overall reaction is
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
The reaction is exothermic reaction because C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
Bond energy is the average needed to break a bond.
Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
C=O = 799 kJ/mol
Final answer:
Respiration is an exothermic reaction because it releases more energy than it absorbs in the form of heat to its surroundings. All such reactions require an initial energy input, known as 'activation energy', to start the reaction. In an exothermic reaction, the heat content 'q' is negative, showing the transfer of thermal energy from the system to its surroundings.
Explanation:
Respiration is an "exothermic reaction", which means it is a chemical reaction that releases energy in the form of heat to its surroundings. This is achieved through the catabolism of foods in your energy bar, which is an example of an exergonic reaction. This reaction absorbs some of the chemical energy stored in the food, turns it into molecules your body can use, and releases the excess energy into the surroundings. However, all chemical reactions, including exothermic and endothermic reactions, require a small amount of energy to activate them.
During an exothermic reaction, there is a net release of energy despite this initial energy input. The energy given off is more than the energy absorbed. This process represents the concept of 'activation energy', an energy barrier that needs to be overcome for the reaction to proceed. Therefore, the heat content, often represented as 'q', is negative in an exothermic reaction, indicating that the system gives off thermal energy to the surroundings, making the surrounding environment warmer.
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