Answer:
[tex]\mu=0.06[/tex]
Explanation:
Given that,
Mass of a block, m = 2 kg
Velocity of the block, v = 6 m/s
It stopped in 10 s
We need to find the coefficient of friction.
The frictional force is balanced by the opposing force such that,
[tex]\mu mg=ma\\\\\mu=\dfrac{a}{g}[/tex]
Where
a is acceleration, a = 6/10 = 0.6 m/s
So,
[tex]\mu=\dfrac{0.6}{10}\\\\\mu=0.06[/tex]
So, the coefficient of friction is equal to 0.06.
How much kinetic energy is required to break through?
Explanation:
The natural environment or natural world encompasses all living and non-living things occurring naturally, meaning in this case not artificial. The term is most often applied to the Earth or some parts of Earth
Name the component used in electric circuits that is sensitive to temperature
Answer :
Tungsten filamentWhat is the resistance of resistor R3?
Answer: 2.0
Explanation: I KNOW !
The diagram shows the electric field near conducting sphere a which of the following statements is correct
Do metals that react vigorously with hydrochloride acid also react vigorously with sulfuric acid?
Answer:
yes
Explanation:
Reactions of acids with metals
Acids react with most metals and, when they do, a salt is produced. But unlike the reaction between acids and bases, we do not get water. Instead we get hydrogen gas.
This is the general word equation for the reaction:
metal + acid → salt + hydrogen
For example, magnesium reacts with hydrochloric acid to produce magnesium chloride:
magnesium + hydrochloric acid → magnesium chloride + hydrogen
Mg + 2HCl → MgCl2 + H2
It doesn't matter which metal or which acid is used, if there is a reaction we always get hydrogen gas as well as the salt. However, how quickly the reaction goes depends on the metal used and how high up in the reactivity series it is.
You weigh a bear by making him stand on four scales as shown. Draw a free-body diagram showing all the forces acting on the bear. If his weight is 1,500 newtons, what is the reading on
the fourth scale?
Answer:
what a fat bear I love physics
ASAP will do brainiest 22 points PLSS HELP
Sports such as football, baseball, soccer, horseback riding, tennis, volleyball, skateboarding, and surfing (to name a few) are full of examples of Newton’s Three Laws of Motion. To answer this question: 1. Choose any sport. Write down the name of the sport. 2. In your own words, state each of Newton’s 3 Laws of Motion and give a clear, specific example of how each law applies to the sport you have chosen.
Answer:
tenis
Tenis applies to each of Newton's 3 Laws of Motion because with the first law if a tenis ball is at rest it will stay at rest unless acted on by an unbalanced force which would be playing tenis in which it would stay in motion. The second law applies since the acceleration at which it is hit times the mass equals the force it has. The third law applies since when hitting a tenis ball back and forth with racquets the reaction may be equal or opposite
A Star fleet science officer drops a large rock from a height of 1.55 m onto the surface of an alien planet. The rock strikes the ground in 0.230 s. Determine the acceleration of gravity.
Answer:
58.6 m/s²
Explanation:
Applying,
s = ut+gt²/2............ equation 1
Where s = height of the rock, u = initial velocity, t = time, g = accelration due to gravity of the planet.
From the question,
Given: s = 1.55 m, t = 0.23 s, u = 0 m/s (dropped from an height)
Substitute these values into equation 1
1.55 = (0×0.23)+g(0.23²)/2
1.55 = 0.0529g/2
0.0529g = 3.1
g = 3.1/0.0529
g = 58.6 m/s²
A __________ is a push or pull.
Answer:
force
Explanation:
Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.
A student is constructing an investigation on static electricity. The student has three balloons and rubs two of them on a piece of wool. The student then touches each balloon to the wall to observe if static electricity would cause the balloon to stick. What is the independent variable in this investigation.
Answer:
Explanation:
As given, the student has three balloons and rubs two of them on a piece of wool. The rubbing of balloon on wool is the independent variable as it was done on two and not on the third as control.
If the index of refraction for a certain glass is 1.5, and the angle of refraction is 15 degrees for a ray of light
traveling from air (index of 1) what is the angle of incidence? (in coming beam)
Round your answer to the nearest tenth of a digit. The answer is in degrees so don't worry about the units
Answer:
[tex]\theta_i = 23^o[/tex]
Explanation:
The refractive index of a medium is given by the following formula:
[tex]\eta = \frac{Sin\theta_i}{Sin\theta_r}[/tex]
where,
η = refractive index = 1.5
[tex]\theta_i[/tex] = angle of incidence = ?
[tex]\theta_r[/tex] = angle of refraction = 15°
Therefore,
[tex]1.5 = \frac{Sin\theta_i}{Sin15^o}\\\\Sin\theta_i=(1.5)Sin15^o\\\\\theta_i = Sin^{-1}(0.388)\\\\[/tex]
[tex]\theta_i = 23^o[/tex]
For the mirror configuration below, the angle of incidence for the going towards the mirror on the right is 15 degrees. What is the angle of reflection for the light ray leaving the mirror on the bottom
Answer:
Thus, the angle of reflection is 15 degrees.
Explanation:
Angle of incidence, i = 15 degrees
The angle of incidence is the angle between the normal to the mirror and the incident ray, the angle of reflection is the angle between the reflected ray and the normal to the mirror.
According to the laws of reflection, the angle of incidence is equal to the angle of reflection.
Thus, the angle of reflection = angle of incidence = 15 degrees
The figure below shows the apparatus used to measure the specific heat capacity of a metal. The electric heater is switched on and supplies 17 000 of thermal energy (heat) to the block of metal. The temperature of the metal rises from 16 °C to 38 °C. The mass of the block of metal is 850 g. No energy is lost from the metal. Calculate the specific heat capacity of the metal.
Answer:
0.909 J/gºC.
Explanation:
From the question given above, the following data were obtained:
Heat (Q) = 17000 J
Initial temperature (T₁) = 16 °C
Final temperature (T₂) = 38 °C
Mass (M) = 850 g
Specific heat capacity (C) =?
Next, we shall determine the change in the temperature of the metal. This can be obtained as follow:
Initial temperature (T₁) = 16 °C
Final temperature (T₂) = 38 °C
Change in temperature (ΔT)
ΔT = T₂ – T₁
ΔT = 38 – 16
ΔT = 22 °C
Finally, we shall determine the specific heat capacity of the metal. This can be obtained as follow:
Heat (Q) = 17000 J
Change in temperature (ΔT) = 22 °C
Mass (M) = 850 g
Specific heat capacity (C) =?
Q = MCΔT
17000 = 850 × C × 22
17000 = 18700 × C
Divide both side by 18700
C = 17000 / 18700
C = 0.909 J/gºC
Therefore, the specific heat capacity of the metal is 0.909 J/gºC.
How much energy is needed to raise the temperature of a 2 g piece of iron from 20 degrees C to 120 degrrees C
Answer:
the amount of energy needed to raise the temperature of the iron is 90 J.
Explanation:
Given;
mass of the iron, m = 2 g
initial temperature, t₁ = 20⁰ C
final temperature, t₂ = 120⁰ C
specific heat capacity of iron, c = 0.45 J/g⁰C
The amount of energy needed to raise the temperature of the iron is calculated as follows;
H = mcΔt
H = mc(t₂ - t₁)
H = 2 x 0.45 x (120 - 20)
H = 90 J
Therefore, the amount of energy needed to raise the temperature of the iron is 90 J.
5. Which energy transformation would friction
cause on a moving train?
A. kinetic energy into thermal energy
B. potential energy into sound energy
C. kinetic energy into potential energy
D. thermal energy into potential energy
Answer:
Fossil fuels store energy from the sun as
Explanation:
Put these components from largest to smallest
1. comet
2. star
3. galaxy
4. nebula
5. planet
6. universe
Answer:
6, 3, 2, 5, 4, 1
Explanation:
Let's describe them from smallest to largest. In fact the size order is not exact as there are exceptions.
An asteroid is a rocky body which lies in the asteroid belt between Mars and Jupiter. They are typically quite small object. The largest asteroid Ceres has been reclassified as a dwarf planet.
A moon is typically a rocky body which is in orbit around a planet. Some moons such as our Moon are quite large and are typically bigger than asteroid. Some moons can actually be smaller than some asteroids.
A planet is a nearly spherical body which is in orbit around the Sun. Planets are larger than moons.
A star is what planets orbit around. It is the source of light and heat. Our Sun is a star which is many times bigger than all of the planets.
A solar system is a star and all of its planets, asteroids, comets and other bodies. It is significantly bigger than a star.
A galaxy, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core. Most galaxies have a supermassive black hole at their centres.
Galaxies also form clusters which are large scale structures.
The universe is everything. It contains billions of galaxies.
Complex matching suggests that individuals who have formed a relationship may differ predominantly in the area of __________.
Answer:
physical attractiveness
Explanation:
Which statement best explains why there could be a force of attraction
between two electrically charged objects?'
because they have like charges
because they have unlike charges
because they have the same number of protons
because they have the same number of electrons
why is it not possible to make use of solar cells to meet all of our energy needs?why
Answer:
In the solar cells, the energy is obtained only during the day, when the Sun shines. .So, it increases the cost of using solar panels as the source of energy. So, the solar cell is not used to meet all our energy needs
hope this helps
have a good day :)
Explanation:
Answer:
In the solar cells, the energy is obtained only during the day, when the Sun shines. ... So, it increases the cost of using solar panels as the source of energy. So, the solar cell is not used to meet all our energy needs
Explanation:
n the solar cells, the solar panel convert solar energy into electricity, which is stored in storage battery. The storage battery give the direct current but all the appliances are working by the alternating current, so first of all direct current is converted into alternating current by any suitable appliances before it can be used to run various devices. So it increases the cost of using solar panels as the source of energy.
Rex decides to launch a priceless vase into the air at a 90-degree angle. The initial velocity vase is +7.0 m/s. Dylan claims that the vase would achieve a higher height if it were launched at a 45-degree a Dylan correct? A. Dylan is correct because a 45-degree launch angle results in the largest vertical range B. Dylan is correct because larger launch angles result in a smaller vertical range. C. Dylan is incorrect because a 90-degree and 45-degree launch angle result in the same range. D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Answer:
D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Explanation:
Projectile is the motion of an object thrown into space. When an object is thrown into space, the only force which acts on it is the acceleration due to gravity.
An object thrown into space would reach maximum height (vertical range) if it is launched at an angle of 90 degrees. For maximum horizontal range, the object needs to be launched at an angle of 45 degrees.
Therefore Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
The correct statement is
D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Information regarding projectile:It is the object motion that should be thrown into space. At the time when the object is thrown into space, the only force that should act on it represent the acceleration because of gravity.
Since object thrown into space should have to reach maximum height in the case when it is launched the 90 degrees angle. Due to the above reasons, option D is considered.
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how does energy apply to newton’s laws?
Answer:
the acceleration of an object is directly pro to the net force acting on it and indirectingly proportional to its mass
What is the magnitude of kinetic energy of a 20kg box moving at a velocity of 8m/s
A. 160 J
B. 80 J
C. 640 J
D. 1280 J
Answer:
Explanation:
[tex]KE=\frac{1}{2}mv^2[/tex] and we are solving for KE:
[tex]KE=\frac{1}{2}(20)(8)^2[/tex] which gives us that
KE = 640 J, choice C.
What is exothermic .Is it a reaction?
Answer:(of a reaction or process) accompanied by the release of heat.
Explanation: trust moi
What is total internal reflection?
Answer:
When a ray of light, passes from a denser to a rarer medium with the angle of incidence greater than the critical angle, the ray is reflected back into the same medium. This phenomenon is call total internal reflection.
a volleyball player has spiked the ball. At the instant the ball leaves her hand, it is 2.6 m above the ground and has an initial vertical velocity of -20 m/s. How long will it take the ball to strike the ground if the opposing team doesn't block it?
Answer: 29.48 s
Explanation:
Given
The initial height of the ball is [tex]h=2.6\ m[/tex]
The ball leaves with an initial velocity of [tex]u=-20\ m/s[/tex]
Using the equation of motion
[tex]h=ut+\dfrac{1}{2}at^2\\\text{Insert the values}\\\\2.6=20\cdot t+\dfrac{1}{2}\times 9.8\times t^2\\\\\Rightarrow 9.8t^2+20t-5.2\\\\\Rightarrow t=\dfrac{-20\pm \sqrt{20^2-4\times 9.8\times (-5.2)}}{2\times 9.8}\\\\\Rightarrow t=\dfrac{-20\pm 603.84}{19.8}\\\\\Rightarrow t=29.48\ s\quad [\text{Neglecting negative t}][/tex]
Therefore, it take 29.48 s for ball to reach the ground.
Depending on how there used, pulleys can have different uses. One use for pulleys is that they can...
A. Increase the total work needed
B. Decrease the total work needed
C. Change the direction of a force
D. Roll things down a ramp
A rock is thrown down from the top of a cliff with a velocity of 3.61 m/s (down). The cliff is 28.4 m above the ground. Determine the velocity of the rock just before it hits the ground.
The velocity of the rock just before it hits the ground is approximately 23.87m/s.
What is the velocity of the rock just before it hits the ground?From the third equation of motion;
v² = u² + 2gs
Where u is initial velocity, v is final velocity, g is acceleration due to gravity ( g = 9.8m/s² ) and s is distance covered.
Given the data in the question;
Initial velocity u = 3.61m/sHeight of cliff s = 28.4mFinal velocity v = ?To determine the final velocity, plug the given values into the equation of motion above.
v² = u² + 2gs
v² = ( 3.61m/s )² + ( 2 × 9.8m/s² × 28.4m )
v² = 13.0321m²/s² + 556.64m²/s²
v² = 569.6721m²/s²
v = √( 569.6721m²/s²)
v = 23.87m/s
Therefore, the final velocity of the object is 23.87m/s.
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Which of the following characteristics were not included in John Dalton's description of the atom? A. In any element, all the atoms are the same. B. Atoms are smaller than quarks. C. All matter is made up of atoms. D. Atoms exist only on Earth. E. Elements in a compound are always in a constant ratio. NO LINKS OR VIRUSES PLS
Answer:
d
Explanation:
atoms exits everywhere
Answer: The correct choices to this question are, "B. Atoms are smaller than quarks," and "D. Atoms only exist on earth." Hope this helped.
Make a free-body diagram of someone pushing a refrigerator that shows:
a. A net force of 100 N with the refrigerator being pushed to the right.
b. The refrigerator is balanced on the floor.
The free body diagram allows to find the results for the forces applied on the refrigerator are;
a) Free-body diagram with applied force.
b) Free-body diagram without applied force.
A free-body diagram is a diagram of the forces without the details of the body, these diagrams are important to clearly visualize the forces and the coordinate systems against which to take measurements.
In the attached we have a free-body diagrams for a refirerator, represented by the box where the forces are appreciated:
The weight that the forces exerted by the earth on the refrigerator. The Normal which is the reaction of the earth to the support of the refrigerator. The force applied by the person. The friction force which is the force between the two surfaces that opposes the movement of the refrigerator.
Newton's second law states that the net force is proportional to the mass times the acceleration of the body.
∑ F = ma
where F is the force, m the mass and the acceleration
∑ F = F - fr = 100 N
a = 100 / m
In conclusion with the free body diagram we can find the results for the forces applied on the refrigerator are;
a) Free-body diagram with applied force.
b) Free-body diagram without applied force.
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16. A student uses 110 N of force to push a box
across a flat room for 7.2 m. Calculate the
amount of work that the student does. Round
your answer to two decimals and show the
correct units of measure.
Answer:
792J
Explanation:
Use the formula Force × Distance
With 110 newtons being the force and 7.2 meters being the distance
Which gives 792 and work us measured in joules therefore its joules
Work done is the dot product of force and displacement. The work done on the box to push across the surface for 7.2 m by applying a force of 110 N is 792 J.
What is force?Force is an external agent acting on a body tp change it from the state of motion or rest. Force is a vector quantity thus, it is characterized by a magnitude and direction.
When force acting on a body results in displacement of the body, it is said to be work done on the body. The work done on the body is the product of force and displacement.
W = F d.
Given the force acting on the box = 110 N
displacement d = 7.2 m
Work done w = 110 N × 7.2 m
= 792 J.
Therefore, the work done on the box is 792 J.
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