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Related Questions
Why is a device never 100% efficient? *
a) Mechanical Advantage
b) Work
c) Friction
d) Speed Ratio
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for science lovers!!
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I’m not sure tho
If you wanted to learn more about ancient scientific knowledge, whose life
would you research?
Answers
Answer:
I would like to research Nikola Tesla's life
Which one of the following is not equivalent to 2.50 miles?
(1.00 mi = 1.61 km = 5280 ft, 1.00 yd = 3.00 ft = 12.0 in.)
(A) 1.32 x 104 ft
(B) 1.58 x 105 in
(C) 4.02 x 103 km
(D) 4.40 x 103 yd
(E) 4.02 x 105 cm
Answers
Answer:
Choice C is not equivalent to 2.50 miles.
Explanation:
The given data is now converted into feet, inches, kilometers, yards and centimeters:
mi - ft
[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi} \right)[/tex]
[tex]x = 13200\,ft[/tex]
[tex]x = 1.320\times 10^{4}\,ft[/tex] (Choice A)
mi - in
[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi} \right)\cdot \left(12\,\frac{in}{ft} \right)[/tex]
[tex]x = 158400\,in[/tex]
[tex]x = 1.584\times 10^{5}[/tex] (Choice B)
mi - km
[tex]x = (2.50\,mi)\cdot \left(1.61\,\frac{km}{mi} \right)[/tex]
[tex]x = 4.025\,km[/tex] (Different from Choice C)
mi - yd
[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi}\right) \cdot \left(\frac{1}{3}\,\frac{yd}{ft} \right)[/tex]
[tex]x = 4400\,yd[/tex]
[tex]x = 4.40\times 10^{3}\,yd[/tex] (Choice D)
mi - cm
[tex]x = (2.50\,mi)\cdot \left(1.61\,\frac{km}{mi} \right)\cdot \left(100000\,\frac{cm}{km}\right)[/tex]
[tex]x = 402500\,cm[/tex]
[tex]x = 4.025\times 10^{5}\,cm[/tex] (Choice E)
Choice C is not equivalent to 2.50 miles.
why does a bouncing ball have a greater change in momentum than a ball that is just caught
Answers
If the ball bounces, then there is an additional velocity change sending the ball back upwards opposite the original direction. Thus, for the same collision time, bouncing involves a greater velocity change, a greater momentum change, and therefore a greater impulse.
Answer:
because with the change in momentum the velocity goes to zero. (more info below)
Explanation:
Momentum is the velocity change multiplied by the mass. When you think about it, bouncing an object means it comes back from anything it bounced against, giving it a velocity that is negative. This means that the velocity change for bouncing is greater than for colliding, as the velocity goes to zero in an inelastic collision like the one described.
hope this helped!
When waves travel through water, why do the moving water particles continue to return to their starting position?
OA.
Waves transfer matter, but not energy.
Waves transfer both matter and energy.
OC.
Waves transfer energy, but not matter.
OD.
Waves don't transfer matter or energy.
Answers
Answer:
Waves transfer energy, not matter
Explanation:
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Choose one object or instrument. Write a detailed explanation of what happens when a loud and quiet sound is made. Use the words vibration, energy, longitudinal wave, amplitude and particles in your answer.
Answers
Answer:
This extra energy causes the string to vibrate more, which helps it move more air particles for a longer time. A string plucked with force has greater amplitude, and greater amplitude makes the sound louder when it reaches your ear. Volume depends on amplitude. Greater amplitude produces louder sounds.
What is the velocity of the objects position vs time graph
Answers
Answer: In a position-time graph, the velocity of the moving object is represented by the slope, or steepness, of the graph line. If the graph line is horizontal, like the line after time = 5 seconds in Graph 2 in the Figure below, then the slope is zero and so is the velocity. The position of the object is not changing
A large force will cause_______ acceleration than a small force
Answers
Answer:
A large force will produce more acceleration than a small force acting on the same object.
An electron in a mercury atom drops from energy level f to energy level c by emitting a photon having an energy of
1. 8.20eV
2. 5.52eV
3. 2.84eV
4. 2.68eV
Answers
Answer:
The answer is 2.84 eV
Explanation:
An electron in a mercury atom drops from energy level f to energy level c by emitting a photon having an energy of 2.84eV.
What is mercury?Mercury is known to be a type of naturally-occurring chemical element that has been discovered in rock that is found in the earth's crust.
They can be found as a form of deposits of coal. On the periodic table, it symbol is "Hg" and it has about 80 atoms. It can be found as Elemental (metallic) mercury, Inorganic mercury compounds, etc.
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As a charged object approaches a neutral object the objects.......
attract
spin
repel
no interaction
Answers
Answer:
attract is the answer.
Answer:
It attracts
Explanation:
It attracts the object
A mover uses a ramp to load a crate of nails onto a truck. The crate, which must be lifted 1.5 m from the street to the bed of the truck, is pushed along the length of the ramp. If the ramp is 4.5 m long and friction between the ramp and crate can be ignored, what is the mechanical advantage of the ramp?
Answers
Answer: M.A = 3
Explanation:
A ramp is an example of an inclined plain. Where the
Height H = 1.5 m
Length L = 4.5 m
Mechanical advantage of a machine is the ratio of the load to effort. While mechanical advantage M.A of an inclined plain is the ratio of the length of the plain to the height of the plain.
M.A = L/H
Substitute the values of L and H into the formula
M.A = 4.5/1.5 = 3
The mechanical advantage of the ramp is 3
1. Of the following, the one that is not an example of a suspension is
a. Milk
b. Milk of magnesia
c. Sand in water
d. Sugar in water
2. The word used to represent a chemical reaction is a/an
a. Atom
b. Formula
c. Equation
d. Symbol
3. When two similarly charged objects are brought close together, they
a. Repel each other
b. Have no effect on each other
c. Stick to each other
d. Attract each other
4. An element common to all acids is
a. Chlorine
b. Hydrogen
c. Nitrogen
d. Oxygen
5. Atoms of the same element that differ slightly in mass are called
a. Ions
b. Isotopes
c. Neutrons
d. Positrons
6. In general, salts
a. Contain hydroxide ions
b. Contain hydrogen ions
c. Are ionic compounds
d. Turn blue litmus red.
7. A dye used to test the acidity of a substance is
a. Litmus
b. Magnesium sulfate
c. Sodium chloride
d. Sodium hydroxide
8. The central portion of an atom is called the
a. Electron
b. Nucleus
c. Ring
d. Shell
9. Sugar is poured into a glass of water and stirred. In this example the sugar is the
a. Solution
b. Solvent
c. Solute
d. Alcohol
10. Which of the following is characterized by a sour taste?
a. Bases
b. Acids
c. Salts
d. Compounds
11. Which of the following is characterized by a bitter taste and turn lithmus blue?
a. Bases
b. Acids
c. Compounds
d. Elements
12. The force of gravity on an object is called
a. Density
b. Mass
c. Volume
d. Weight
13. The liquid referred to as the “universal solvent” is
a. Alcohol.
b. Benzene.
c. Oil.
d. Water.
14. A statement that proposes a cause-and-effect relationship between two variables is called:
a. Conclusion.
b. Fair test.
c. Hypothesis.
d. Theory
15. Any substance that has mass and occupies space is called
a. A gas
b. A liquid
c. Matter
d. A solid
16. When the numbers of electrons and protons in a sample of matter are equal, the matter is
a. Insulated.
b. Negatively charged.
c. Neutral.
d. Positively charged.
17. Which of the following is most important when judging the quality of a scientific theory?
a. The quality and reliability of data that support the theory
b. The amount of detail provided in the theory
c. How recently the theory has been published
d. The respectability of the scientists setting forth the theory
18. Substances that cannot be decomposed to any simpler substances are called
a. Compounds.
b. Elements.
c. Mixtures.
d. None of the above.
19. When the air in a bell jar containing a ringing bell is removed, the sound decreases because
a. The removal of the air prevents electric current from flowing
b. Sound cannot travel through the air
c. Sound cannot travel through glass
d. Sound cannot travel in a vacuum
20. An element common to all acids is
a. Chlorine.
b. Oxygen.
c. Nitrogen.
d. Hydrogen.
21. The amount of matter in an object is best expressed by its
a. Density
b. Mass
c. Volume
d. Weight
22. A substance that increases the rate of a reaction is a
a. Liquid
b. Gas
c. Catalyst
d. Solid
Answers
Answer: 1. C
Explanation: 2. C
____ charges are attract each other
Answers
Answer:
One positive and one negative
Help.
Why do scientists believe that global warming is happening?
Answers
7. How does friction affect the kinetic energy of an object?
Answers
Answer:
Friction is a resistive force to motion. When two bodies move against each other some of the kinetic energy is converted to heat energy due to friction. This reduces the total kinetic energy in the system. ... Mechanical energy is reduced due to friction and converted to heat.
Explanation:
Kinetic friction does oppose the relative motion of two surfaces. If the one of these surfaces is stationary, then it will tend to slow down the moving object.
please i need detailed explanation
Answers
Answer:
2Micro Farahds
Explanation:
Its in the picture.
I Hope it helps.
A circuit has a voltage drop of 12 V across a 30 2 resistor that carries a
current of 0.8 A. How much power is used by the resistor? Use P = VI.
A. 360 W
B. 12W
C. 9.6 W
D. 24 W
Answers
Answer:
C
Explanation:
V=12v
I=0.8A
P=VI
=(12)(0.8)
=9.6W
Answer:
9.6
Explanation:
Which situation will the lowest resistance occur
Answers
The correct choice is ' C '.
-- Shorter wire has less resistance than longer wire.
-- Thicker wire has less resistance than thinner wire.
-- Colder wire has less resistance than hotter wire.
What happens to the average kinetic energy of water molecules as water freezes
A. It increases as the water releases energy to its surroundings
B. It increases as the water absorbs energy from its surroundings
C. It decreases as the water releases energy to its surroundings
D It decreases as the water absorbs energy from its surroundings
Answers
Answer:
C. It decreases as the water releases energy to its surroundings
Explanation:
The energy that is possessed in the body because of the motion is said to be kinetic energy. When the water freezes, the kinetic energy of the water molecules decreases as the particles stop motion. The energy is released in the surrounding. Freezing takes place when the liquid molecules slow down and lose the kinetic energy to form the solid crystals.
If you see ##### in a cell, you should
make the row taller
retype the number
type in a different number
make the column wider
Answers
Answer:
it's D. Make the column wider
Explanation:
How do you represent an object in a free body diagram?
A)An object is represented in a free-body diagram by an arrow and tail.
B)An object is represented in a free-body diagram by a box with a dot in
the middle, indicating its center of mass.
C)An object is represented in a free-body diagram by a word that says object.
D)An object is represented in a free-body diagram by having the mass labeled.
Clear answer
Answers
Answer: the answer is D
Explanation:
how does the direction of acceleration compare with the direction of the net force that produces it
Answers
Answer:
Explanation:
The direction of the acceleration is in the same direction as the net force causing it. F = ma is actually a vector equation in which f and a are both vectors and m is a scalar constant.
A wave is traveling from one medium to another.If the wave is partially transmitted an partially reflected from the boundary,what will happen to the amplitude of the reflected wave?
Answers
Answer: the answer is C
Explanation:
At which point is the potential energy the greatest? At which point is kinetic energy the greatest?
Answers
Answer:
Kinetic energy is greatest at the lowest point of a roller coaster and least at the highest point.
hope it helps you make me as brainlylistPotential energy will be greatest at the points A and G, and kinetic energy will be greatest at the point D.
• The energy possessed by an object due to its motion is termed as the kinetic energy. On the other hand, the energy stored within an object because of its position relative to some zero position is known as the potential energy of the object.
• Kinetic energy is highest when the velocity is the highest, in the case of pendulum, this takes place at the bottom. In the given case, that is, at point D.
• If kinetic energy is highest at point D, then at the same point potential energy will be the lowest.
• Therefore, potential energy would be highest at its highest point on each of the side of its motion where it remains stationary for some time, that is, at point G and A.
Thus, kinetic energy would be highest at point D, and potential energy would be highest at the points A and G.
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Which term best describes this step of the investigative process?
question
communication of results
peer review
experiment control
Answers
Answer:
peer review
Explanation:
The investigative process involves the development and inclusion of the steps involved to find an answer or solution to a specific question. Certain steps are followed in the process. The hypothesis is formulated, tested, and modified during the whole process. peer review involves the suggestions, comments, and interpretation of people in similar fields about the hypothesis. The given extract focuses on the investigative process of peer-reviewing. The review of the scientists from different countries has been asked to give their suggestions and advice on the journal before its publication.
Which of the following is an example of a visual aid? A. a poster B. a pair of glasses C. a set of note cards D. a copy of a written report
Answers
Answer:
a pair of glasses
of course
A vector points 12.0 units along the x-axis, and 9.00 units along the y-axis. Find the direction of the vector
Answers
The resultant points somewhere between the positive x and y axes.
The angle it makes with the x-axis has a tangent of (9/12) = 0.75 .
That angle is 36.9°, rounded to the nearest tenth of a degree.
So the resultant vector points up and to the right, 36.9° above the x-axis.
Curtains over a window are an example of _____. A. transmission B. a medium for light C. how light waves do not require a medium D. a substance that does not transmit a wave
Answers
Answer:
C
Explanation:
we know that light doesn't need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels.
if you crash your car how could you decrease the damage to you or the car using the concept of impulse
Answers
Explanation:
Crumple zones are sections in cars that are designed to crumple up when the car encounters a collision. Crumple zones minimize the effect of the force in an automobile collision in two ways. By crumpling, the car is less likely to rebound upon impact, thus minimizing the momentum change and the impulse.
The way a rock reflects light is called the rock's
A. streak
O B. luster
O C. cleavage
D. specific gravity
Answers
The way a rock reflects light is called the luster of the rock. Hence option B is the correct answer.
What is Reflection?When light rays bounce off one surface, transition from one transparent medium to the next, or proceed through a media whose structure is constantly shifting, they change direction.
According to the law of reflection, the angle of the reflected ray when reflecting from a level surface is the same as the angle of the ray. (By practice, all angles in wave propagation are expressed with regards to the normal to the surface, or to the line that is perpendicular to it.
The light beam and the surface normally establish a plane in which the reflected beam is always located. The pictures created by straight and curved mirrors can be understood using the
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