Answer: Friction force
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Explanation:
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Which BEST explains why it is important to warm up before strenuous exercise?
A.
It is very hard on the joints when exercise begins without warm up.
B.
It strains the muscles if blood and oxygen levels are not already activated.
C.
Warm-ups limit the oxygen supply, prepping the body for the rush during exercise.
D.
An exercise session should not include more than 30 minutes of aerobic activity.
Answer:
A
Explanation:
or else u would get a muscle pull
Answer:
a
Explanation:
can you predict a dark room is empty or not with the help of sound? how?
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50 points
Answer:
Sound waves can reflect off surfaces. We hear sound reflections as echoes. Hard, smooth surfaces are particularly good at reflecting sound. This is why empty rooms produce lots of echoes.
Soft, rough surfaces are good at absorbing sound. This is why rooms with carpets and curtains do not usually produce lots of echoes.
Explanation:
With this information, you'd be able to come up with your answer,
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yea, by sound enegy example if uh speak a your sound knock on the object and react to your ears
Describe how energy is transferred from 1 form to another
Answer:
Thermal energy may be transferred in three ways: conduction, convection, and radiation. Conduction occurs when heat energy is exchanged between nearby molecules that are in touch with one another.
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difference between horizontal and vertical motions
Answer:
This is to say that the vertical velocity changes by 9.8 m/s each second and the horizontal velocity never changes. This is indeed consistent with the fact that there is a vertical force acting upon a projectile but no horizontal force.
Explanation:
Please if someone knows the answer please help
whose geocentric model of the solar system was accepted for 1400 years
Answer:
Plato, Aristotle developed it further and used for 1400 years till Copernicus.
Explanation:
Two point charges are separated by 6.4 cm . The attractive force between them is 10 N . Suppose that the charges attracting each other have equal magnitude. Rearrange Coulomb's law and find the magnitude of each charge. Express your answer to two significant figures and include the appropriate units.
Answer:
Two point charges are separated by 6.4 cm . The attractive force between them is 10 N .
units.
Explanation:
Explain this phase diagram by relating what you know about temperature, states of matter and
pressure.
Answer:
See explanation
Explanation:
The vertical axis corresponds to the pressure of a substance, while the horizontal axis corresponds to the temperature. The solid is the substance which contains particles of strong intermolecular force and compaction, typically ionic at a certain temperature, the liquid is the substance which contains relatively compact molecules, however lacks a particular arrangement. The gaseous substance is caused by particles with weak intermolecular forces, causing particle movement and collision with no arrangement whatsoever. The triple point as shown in the diagram, is the phrase on a diagram where each substance: solid, liquid and gas coexist. The critical point is the phase at which the/a substance is indistinguishable between liquid and gaseous states. A substance or elements state is highly dependent on its environment and it’s temperature, of which ultimately affects its kinetic energy within its particles. This is what the graph portrays and represents.
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As a falling apple, approaches the ground, its potential energy
Answer:
Decreases.
Explanation:
When an object with potential energy falls to the ground, its potential energy decreases and kinetic energy increases.
if v= 4.3 + 1.2% and I = 2.1A + 4.5% find the resistance and significant figures
Explain why the coin is able to float on top of the water in this glass.
Answer:
Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.
Explanation:
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1. Imagine that you design running shoes for a living. Which biometric would be most useful?
A.
the average weight of a runner
B.
the number of runners in a popular urban area
C.
the points of impact when the foot hits the ground
D.
the distance that beginning runners attempt to finish
2. Mike is studying the differences between the body mechanics of swimmers in pools versus open water. What is his focus on?
A.
statics
B.
dualism
C.
statistics
D.
dynamics
3. What is the potential hazard of failing to use equipment correctly at the gym?
A.
It is poor gym etiquette.
B.
It can cause injuries or pulled muscles.
C.
Poor exercise habits can actually cause stress.
D.
The exercise will not release endorphins if you do it wrong.
4. Ira is concerned about his posture. He tests it by seeing how long he can hold good posture and finds that he feels the most discomfort in his back. What does that suggest that he needs to do?
A.
Keep a neutral spine.
B.
Place his hands on his hips.
C.
Arc his back when he walks.
D.
Tuck his chin close to his chest.
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Answer: Like marathon runner is about 140 pounds
Explanation:
Imagine everyone in the United States exhibited the character traits we have been discussing. In what ways would America be different?
Now imagine no one in American exhibited any of those character traits. In what ways would America be different?
Answer:
Characterization is the process by which the writer reveals the personality of a character. Characterization is revealed through direct characterization and indirect characterization. Direct Characterization tells the audience what the personality of the character is.
Explanation:
Mood, or atmosphere, is the feeling created in the reader by a literary work or passage. ... Often, a writer creates a mood at the beginning of a work and then sustains the mood throughout. Sometimes, however, the mood of the work changes dramatically.
what work is done when a person pushes a refrigerator across the floor 12m using 480N of force ?
Answer:
W = 5760 J
Explanation:
Force (F) = 480 N Distance (d) = 12 m Work (W) = ?Use the formula:
W = F * dReplace with the data, and solve:
W = 480 N * 12 mW = 5760 JThe work done was 5760 Joules.
Greetings.
A box collides with a ball as shown in the diagram below. After the collision, what
will the final momentum of the ball be?
BEFORE COLLISION
AFTER COLLISION
15 kgm/s
3 kgm/s
5 kgm/s
_kgm/s
O 18 kg * m/s
O 5 kg * m/s
O 10 kg * m/s
O 13 kg * m/s
The final momentum of the ball after collision is 13 kg.m/s.
The given parameters;
initial momentum of the box, P₁ = 15 kg.m/sinitial momentum of the ball, P₂ = 3 kg.m/sfinal momentum of the ball, P₃ = 5 kg.m/sLet the final momentum of the ball after collision = P₄
Apply the principle of conservation of linear momentum to determine the final momentum of the ball after collision;
total momentum before collision = total momentum after collision
P₁ + P₂ = P₃ + P₄
15 + 3 = 5 + P₄
18 = 5 + P₄
18 - 5 = P₄
13 = P₄
Thus, the final momentum of the ball after collision is 13 kg.m/s.
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How many newtons does a 5-kg backpack weigh on Earth?
hello, may you please help me
Calculate the percentage of water of crystallisation in Na2CO3•10H2O
Answer:
62.9%. The molar mass of sodium carbonate is 106 grams per mole. Each water molecule adds another 18.0 grams per mole.
An automobile travels the first half of an 80.0 mi trip at 20.0 mi/h and the second half of the trip at 40.0 mi/h. What is the average speed for the entire trip?
This question involves the concepts of uniform speed motion and average speed.
The average speed for the entire trip is "26.67 mi/h".
First, we need to find out the total time taken for the entire trip. For that purpose, we will break the entire trip into two halves of uniform speed motion:
[tex]Total\ Time = t_1+t_2\\\\Total\ Time = \frac{s_1}{v_1}+\frac{s_2}{v_2}\\\\Total\ Time = \frac{40\ mi}{20\ mi/h}+\frac{40\ mi}{40\ mi/h}\\\\Total\ Time = 2\ h + 1\ h\\Total\ Time = 3\ h[/tex]
Now, the average speed for the entire trip will be:
[tex]Average\ Speed = \frac{Total\ Distance}{Total\ Time}\\\\Average\ Speed =\frac{80\ mi}{3\ h}[/tex]
Average Speed = 26.67 mi/h
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The attached picture explains the concept of average speed.
Explain how solar and lunar eclipse occur with the help of a labelled diagram.
Answer:
a solar eclipse occurs when the moon passes in front of the sun,blocking it out partially or completely. the eclipse results in parts of the earth being covered in the shadow of the moon. a lunar eclipse occurs when the moon passes directly behind earth and into its shadow.
Explanation:
Give a short introduction to alternative energy
Answer:
Alternative energy is energy sources other than fossil fuels, including renewable sources and nuclear energy. However, nuclear energy is not classified as a renewable energy source, because it is mined from uranium and thorium elements, which cannot be replenished. Hoped this helped!!!
what is the standard measurement system used by scientists around the world?
Answer:
Hey mate....
Explanation:
This is ur answer....
The International System of Units (SI), commonly known as the metric system, is the international standard for measurement.Hope it helps!
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International system of units.French système international d'Unitès, international decimal system of weights and measures derived from and extending the metric system of units.Adopted by the 11th General conference on weights and measures (CGPM) in 1960, It is abbreviated SI in all languages.
4cm cubed = ?m cubed
Answer:
[tex]{ \rm{1 \: {cm}^{3} = \frac{1}{100 {}^{3} } \: {m}^{3} }} \\ \\ { \rm{4 \: {cm}^{3} = \frac{4}{1000000} \: {m}^{3} }} \\ \\ { \boxed{ \rm{ = 0.000004 \: {m}^{3} }}}[/tex]
Wirte Different Methods of Transmission of heat?
Answer:;
Explanation:
which type of forces would be experienced by a sled that is being pulled by a rope (choose 4)
If a FRAMESHIFT mutation causes a stop codon to be inserted into the DNA sequence
Answer:
The frameshift mutation will also alter the first stop codon ("UAA", "UGA" or "UAG") encountered in the sequence. The polypeptide being created could be abnormally short or abnormally long, and will most likely not be functional.
Explanation:
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a 6.00-kg ornament is held at rest by two light wires that form 30° angles with the vertical, as shown in the figure. an external force of magnitude f acts vertically downward on the ornament. the tension exerted by each of the two wires is denoted by t. a free-body diagram, showing the four forces that act on the box, is shown in the figure. if the magnitude of force f is 410 n, what is the magnitude of the tension t?
The equilibrium condition allows finding the result for the tension of the cable that supports the block is:
The tension is: T₁ = 270.66 N
Newton's second law gives a relationship between force, mass and the acceleration of bodies, when the acceleration is zero it is called the equilibrium condition.
A free-body diagram of the forces is shown in the attachment.
Let's write the equilibrium equation for the vertical axis.
2 [tex]T_1_y[/tex] - f - W = 0
2 [tex]T_1_y[/tex] = W + f
Let's use trigonometry to find the tension, as the angle indicates that it is relative to the vertical.
cos 30 = [tex]\frac{T_1_y}{T_1}[/tex]
[tex]T_1_y[/tex] = T1 cos 30
We substitute.
2T₁ cos 30 = W + f
T₁ = m g + f / 2 cos 30
T₁ = [tex]\frac{6 \ 9.8 + 410}{2 \ cos 30}[/tex]
T₁ = 270.66 N
In conclusion using the equilibrium condition we can find the result for the tension of the cable that supports en bloc is:
The tension is: 270.66 N
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Gravitational potential energy is just one type of stored energy.
t or f??
Answer: true because potential energy is stored in a object
Explanation:
how can you reduce the percentage uncertainty in measurements that you make?
21/33
A crane is lowering a 50 kg box. If the crane lowers the box at a
constant speed, what is the tension Fr in the cable?
Answer:
400N
Explanation:
convert -13°F into (a) °C (b) kelvin
Answer:
-25ºC
Explanation: