Answer:
Friction force
Explanation:
Friction force is a force that opposes a motion from moving but friction may seem a bad thing but it is very useful for writting and for other things. please give me a like and thank me.
The force that opposes motion between two surfaces is known as friction. It depends on the types of materials and surfaces in contact. There are four types of friction: Static, Sliding, Rolling, and Fluid, and each one has practical applications in our daily lives.
Explanation:The force that opposes motion between two surfaces is known as friction in physics. Friction is everywhere in our daily lives. It's the force that allows us to walk, ride a bike, or even hold objects in our hands. The amount of friction between two surfaces is dependent on the type of materials in contact and how rough the surfaces are. For example, ice has less friction than gravel.
There are four types of friction: Static, Sliding, Rolling, and Fluid. The friction that opposes motion between two stationary objects (when you try to slide a heavy box, for instance) is known as static friction. When the objects are set in motion, the friction is known as sliding friction. A moving object over the surface like a wheel over the road experiences rolling friction. Fluid friction refers to the resistance between layers within a viscous fluid or when the fluid is moving over a surface. Each type of friction has important practical applications and implications in our day-to-day life.
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4) Consider a separate rocket, also in deep space with a mass of 30.0 kg. If the rocket is
observed to be travelling at v = 5.00m/s at t = 3.00 s and then travelling at v= -2.00m/s at t = 14.0 s
with constant acceleration, calculate:
a) the acceleration, à.
b) the force F, acting on the rocket from the thrusters.
Explanation:
a) Acceleration is the change in velocity over change in time.
a = Δv / Δt
a = (-2.00 m/s − 5.00 m/s) / (14.0 s − 3.00 s)
a = -7/11 m/s²
a ≈ -0.636 m/s²
b) Force is mass times acceleration.
F = ma
F = (30.0 kg) (-0.636 m/s²)
F = -19.1 N
In the visible spectrum, the color of light depends on the frequency. Which statement BEST describes the wavelengths of a certain frequency?
A) A low frequency wave has a long wavelength.
Explanation:
Electromagnetic waves are periodic oscillations of the electric and the magnetic field in a plane perpendicular to the direction of motion the wave.
Electromagnetic waves travel in a vacuum always at the same speed, the speed of light:
[tex]c=3.0\cdot 10^8 m/s[/tex]
The wavelength and the frequency of an electromagnetic wave are related by the wave equation:
[tex]c=f\lambda[/tex]
where
c is the speed of light
f is the frequency
[tex]\lambda[/tex] is the wavelength
From the equation above, we observe that the frequency and the wavelength are inversely proportional. Therefore, the only correct option could be
A) A low frequency wave has a long wavelength.
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A 0.250 kg mass is attached to a spring with k=18.9 N/m. At the equilibrium position, it moves 2.89 m/s. What is the amplitude of the oscillation? (Unit=m)
Amplitude of oscillation is 0.33 m
Explanation:
Amplitude is the maximum displacement of points on a wave from the point of equilibrium. In the above question,mass attached to a spring of k=18.9N/m follows an oscillatory motion where ,
Angular frequency = [tex]\sqrt{k/m}[/tex] where k is the spring constant and m is the mass
Angular frequency =[tex]\sqrt{18.9/.250[/tex] = 8.69
Therefore ,amplitude is equal to velocity/angular velocity
A=2.89/8.69
=0.33m
Hence , the amplitude of oscillation is 0.33 m.
Answer:
0.33
Explanation:
3) While flying horizontally in an airplane, you notice that a string dangling from the overhead
luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane.
Using this observation, you can conclude that the airplane is
A) accelerating forward.
B) moving backward.
C) moving forward.
D) not accelerating because the string is at rest.
E) accelerating backward.
Please help I am stuck!!!!!!
Answer:
A
Explanation:
the string would be dangling backwards because you are moving forward it would be putting backward force on the string
Thus the response above i.e., "Option E" is the appropriate alternative.
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How does the image help convey the message of this poster?
The image of a large clock next to a lazy worker stresses the importance of being on time, particularly for work in the factories.
The image of a large clock next to an unproductive worker emphasizes the importance of utilizing every minute of production time.
The image of a large clock next to a tired worker supports the idea of maintaining fair working hours, even during the war.
The image of a large clock next to a slow worker suggests that faster production is the central key to winning the war.
The image on the poster emphasizes the importance of utilizing every minute of production time
What is an image?An image is a graphic representation which often conveys a message. It has been a common practice to pass on important messages by the use of imagery.
From the image on the poster, the message conveyed is that; the image of a large clock next to an unproductive worker emphasizes the importance of utilizing every minute of production time.
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Answer: B
Explanation:
In a single replacement reaction, what will a metal always replace?
A metalloid
B nonmetal
C metal
Answer: Option C. metal
Explanation:
In a single replacement or displacement reaction, metals that are higher in activity series will displace those lower in activity
Most of the climate changes over the past 650,000yrs are attributed to what happening?
Most of the climate changes over the past 650000 years are attributed to global warming
Explanation:
Global Warming is the rise in the average temperature of the Earth's climate system over a time period. It leads to climate change.
Global warming is mainly caused by man, who by his actions causes an increase in the temperature on Earth.
The main way that he influences this phenomenon is, he is responsible for emission of greenhouse gases like carbon di -oxide , methane and other gases.
This paves way for the sea level rising, Ice in Arctic regions melting, frequent extreme weather conditions.
In some areas there might be abundant rainfall and in other areas there might be drought.
The impact of global warming will be extinction of many species, low crop yield.
Rising sea levels, will have an impact on people living in coastal areas.
So we have to do what we can to slow down the global warming and protect our environment and our Earth.
Which two atmospheric gases do not react with many substances?
A.
Oxygen (O2)
B.
Argon (Ar)
C.
Nitrogen (N2)
D.
Carbon dioxide (CO2)
PLZ help :(
Answer:c and d
Explanation:
i just looked it up and read
Answer:
Argon(Ar) and Nitrogen(N2)
Explanation:
How does the unbalanced force of gravity affect the horizontal and vertical velocities of an object in projectile motion?
Answer:
A projectile is an object upon which the only force is gravity.
Explanation Gravity acts to influence the vertical motion of the projectile, thus causing a vertical acceleration. The horizontal motion of the projectile is the result of the tendency of any object in motion to remain in motion at constant velocity.
Final answer:
Gravity affects the vertical motion of a projectile by imparting a constant downward acceleration of 9.8 m/s², while the horizontal motion remains constant and independent of this vertical force. Consequently, the horizontal and vertical velocities of an object in projectile motion are influenced separately by gravity.
Explanation:
The unbalanced force of gravity affects the horizontal and vertical velocities of an object in projectile motion by impacting them independently. Gravity causes a constant vertical acceleration of 9.8 m/s² (downwards) that does not influence the horizontal motion, which remains constant if air resistance is ignored. The horizontal motion of an object in projectile motion is independent of its vertical motion because the force of gravity only acts downwards.
Projectile motion is interesting to study since it involves two independent components of motion: horizontal and vertical. An example of this independence is that the time it takes for a horizontally launched projectile to hit the ground is determined solely by its vertical motion, unaffected by its horizontal velocity.
During projectile motion, at the peak of its trajectory, the projectile has only a horizontal velocity component and effectively resembles uniform circular motion for an instant, since gravity acts perpendicular to the motion.
A car with the mass of '800 kg is moving at a velocity of 34 m/s. What is 10 points
the kinetic energy? *
462400)
27200)
O 24;
0
400)
Answer:462400joules
Explanation:
Mass=m=800kg velocity=v=34m/s
Kinetic energy=(m x v^2)/2
Kinetic energy =(800x34^2)/2
Kinetic energy =(800x34x34)/2
kinetic energy =924800/2
Kinetic energy =462400joules
Sound waves strike a glass and cause it to shatter because of what?
Answer:
Sound waves strike a glass and cause it to shatter. This illustrates what phenomenon? the angle at which a wave strikes a reflective medium (the angle of incidence, or theta_i) is equal to the angle at which a wave reflects off the medium (the angle of reflection)
009 10.0 points
Find the density of seawater at a depth where
the pressure is 126 atm if the density at the
surface is 1100 kg/m”. Seawater has a bulk
modulus of 2.3 x 10' N/m². Bulk modulus is
defined to be
will be
ensions
Po AP
B = POST
DP
The density is [tex]1106 kg/m^3[/tex]
Explanation:
The bulk modulus of a liquid is defined as
[tex]B=\rho_0 \frac{\Delta p}{\Delta \rho}[/tex]
where
[tex]\rho_0[/tex] is the density at the reference level
[tex]\Delta p[/tex] is the change in pressure
[tex]\Delta \rho[/tex] is the change in density
The equation can be re-arranged as
[tex]\Delta \rho = \frac{\rho_0 \Delta p}{B}[/tex]
In this problem, we have:
[tex]\rho_0 = 1100 kg/m^3[/tex] (density at the surface)
[tex]B=2.3\cdot 10^9 N/m^2[/tex] (bulk modulus of seawater)
[tex]\Delta p = 126 - 1 = 125 atm = (125\cdot 1.01\cdot 10^5) Pa[/tex] (pressure difference between the point where p = 126 atm and the pressure at sea level, which is 1 atm)
Therefore,
[tex]\Delta \rho = \frac{(1100)(125\cdot 1.01\cdot 10^5)}{2.3\cdot 10^9}=6.0 kg/m^3[/tex]
So, the density at the depth where the pressure is 126 atm is
[tex]\rho = \rho_0 +\Delta \rho = 1100+6=1106 kg/m^3[/tex]
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A wave is traveling at 241 m/s. It has a wavelength of 30.0 m. What is its frequency?
A. 8.03 Hz
B. 30.0 Hz
C. 271 Hz
D. 7,230 Hz
Answer:
A) 8.03Hz
Explanation:
f = V/λ
Where wavelength( λ )= 30m
Speed (V) =241m/S
f= 241/30=8.03Hz
A compound that releases hydrogen ions in solution would most likely have which chemical property?
It would react with metals to form a salt and water.
It would react with nonmetals to form a salt and water.
It would react with metals to form hydrogen gas.
It would react with nonmetals to form hydrogen gas.
A compound, which releases hydrogen ions in solution would most likely react with metals to produce hydrogen gas.
• Based on Arrhenius's concept, an acid refers to a substance, which donates or releases ions of hydrogen in water. While a base is illustrated as a substance, which donates ions of hydroxide when dissolved in water.
• This acid when reacts with metals generates hydrogen gas, for example, when metal sodium reacts with HCl it produces hydrogen gas and NaCl.
• On the other hand, when bases react with acids, they produce water with salt.
Thus, the statement, that is, it would react with metals to form hydrogen gas is correct.
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Answer:
C It would react with metals to form hydrogen gas.
Calculate the force of gravity on a 4 kg mass at Earth's surface. The mass of the Earth is 6 x 1024 kg and its radius is
6.4 x 106 m. Do not use scientific notation. Round to a whole number (no decimal).
Answer:
39.2 N
Explanation:
1kg at the earth's surface has a force of 9.8 N acting on it.
(4 kg) (9.8N) = 39.2 N
A 0.500 kg mass is oscillating on a
spring with k = 330 N/m. The total
energy of its oscillation is 3.24 J.
What is the maximum speed of
the mass?
(Unit = m/s)
Answer: E = kA2/2 ⇒
A = √(2E/k) = √[2(3.24)/330] m = ? m
Explanation: Equate the elastic potential energy at the amplitude to the total energy of the mass. The answer will not depend on the mass.
Answer:
3.6
Explanation:
PLEASE HELP’!
A block of ice is sliding down a ramp made of ice that is 15° above the horizontal. What is the
acceleration of the block?
Answer:
a= g sinθ
Explanation:
Given that
Angle ,θ = 15° (from the horizontal)
Lets take the mass of the block = m
The acceleration due to gravity = g
The acceleration of the block = a
When block slide down :
The gravitational force on the block = m g sinθ
By using Newton's second law
F= m a
F=Net force ,a acceleration ,m=mass
m g sinθ = ma
a= g sinθ
Therefore the acceleration of the block will be g sinθ.
an object with a kinetic energy of 2160 J has a new mass of 120kg. What is it's velocity?
Answer:
The velocity is 6 m/s
Explanation:
We use the formula of kinetic energy=
Ec= 1/2 x m x v2
2160 J = 1/2 x 120 kg x v2
v =[tex]\sqrt[n]{x} 2160Joulex2/120kg\\[/tex]
v= 6m/s
1Joule= 1 kgm2/s2
This is used by scientists to measure time and events during earth history
Answer: Scientists used relative dating and absolute dating.
Explanation:
Scientists used absolute dating to determine the actual number of years ago that events happened. They used relative dating to divide Earth's past into several time frames when similar organisms were on Earth.
This is used by scientists to measure time and events during Earth's history.
Answer : Geologic Time
375 kJ is added to a 25.0 kg granite rock. How much does the temperature increase? NEED HELP SOLVING
Final answer:
To find the temperature increase, you can use the formula Q = m * c * ΔT, where Q is the heat energy added, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the temperature increases by 600 °C.
Explanation:
To find the temperature increase, we can use the formula:
Q = m * c * ΔT
where:
Q is the heat energy added,m is the mass of the object (in kg),c is the specific heat capacity of the material (in J/kg · °C),ΔT is the change in temperature (in °C).In this case, we have:
Q = 375 kJ = 375,000 J (since 1 kJ = 1000 J),m = 25.0 kg,c = specific heat capacity of granite.Using the formula, we can calculate the temperature increase as follows:
ΔT = Q / (m * c)
ΔT = (375,000 J) / (25.0 kg * 0.79 J/g · °C)
ΔT = 600 °C
Therefore, the temperature increases by 600 °C.
According to Newton's Brd Law, an object's momentum depends on it's velocity and mass, 4 dog-sled teams
competed to see who could gain the greatest momentum. All 4 sled and driver teams were the same mass, but
each driver had to select a passenger to carry as part of the challenge. Each passenger was a different mass
Which sled team had the greatest momentum at the finish line?
A
Sled Team A 48 kg moving at 10m/5
Sted Tem
C
ving-at-18mts
Sled Team C 28 kg moving at 12m/s
D
Sled Team D 22 kg moving at 12 m/s
Answer:
Team A has the greatest momentum
Explanation:
The momentum of an object is a vector quantity given by
[tex]p=mv[/tex]
where
m is the mass of the object
v is its velocity
In this problem, we have to compare the momenta of the different sleds.
We have:
A) Sled Team A 48 kg moving at 10m/s:
m = 48 kg
v = 10 m/s
p = (48)(10) = 480 kg m/s
B) Sled Team B 14 kg moving at 18m/s
m = 14 kg
v = 18 m/s
p = (14)(18) = 252 kg m/s
C) Sled Team C 28 kg moving at 12m/s
m = 28 kg
v = 12 m/s
p = (28)(12) = 336 kg m/s
D) Sled Team D 22 kg moving at 12m/s
m = 22 kg
v = 12 m/s
p = (22)(12) = 264 kg m/s
So, team A has the greatest momentum.
Earth is round, but it looks flat to someone near the ground. Use this idea to explain why the image a concave mirror forms of an object less than one focal length away is a virtual image.
Image formed by concave mirror when an object is place less than one focal length away is a virtual image.
Explanation:
When an object is placed less than one focal length from concave mirror, the light rays from the same point on object reflect on the mirror and diverge. Hence causing the image formed to be magnified and virtual. The image must be found by extending the reflected beams in reverse direction of the mirror.The intersection point is the virtual image area. Similar concept can be used to explain why earth looks flat to someone near the ground.
How much work is done if a 50.ON force is applied on an object in the direction of
motion while the object slides 3.00 m across the floor?
Answer:150Nm
Explanation:
Force=50.0N distance=3.00m
Work=force x distance
Work=50 x 3
Work=150Nm
How many electrons are in a hydrogen atom?
Answer:
1
Explanation:
If you take a look on a periodic table of elements, you will notice that hydrogen has the atomic number of 1. This number directly corresponds to the number of electrons an atom has.
Let me know if you have any other questions!
A neutral hydrogen atom has exactly one electron orbiting its nucleus. This electron is situated in the 1s orbital, part of the atom's valence shell, highlighting hydrogen's unique position in the periodic table and its ability to bond with other elements.
Explanation:A hydrogen atom consists fundamentally of a nucleus and one electron orbiting this nucleus. When we discuss a neutral hydrogen atom, we refer to an atom where the number of protons (positively charged particles within the nucleus) is equal to the number of electrons (negatively charged particles orbiting the nucleus). Since hydrogen is the first element in the periodic table, it has exactly one proton in its nucleus. Consequently, to maintain electrical neutrality, a hydrogen atom also has exactly one valence electron. This electron occupies the 1s orbital, the closest orbital to the nucleus, which is part of the hydrogen atom's n = 1 valence shell.
This shell can hold up to two electrons, showing hydrogen's potential to bond or interact with other atoms either by losing its electron to become a cation (H+) or by gaining an electron to form a hydride ion (H−), or it can share its electron to form a single covalent bond. Therefore, hydrogen is not only a group 1 element but also shares characteristics with group 17 elements due to its unique electron configuration.
A swimmer is swimming to the left with a speed of 1.0 m/s when she starts to speed up with constant acceleration. The swimmer reaches a final speed of 2.5 m/s over a distance of 5.0 m. How long did the swimmer take to speed up to 2.5 m/s? Around the answer to two significant digits.
Answer:
Correct answer: t = 2.86 seconds
Explanation:
We first use this formula
V² - V₀² = 2 a d
where V is the final velocity (speed), V₀ the initial velocity (speed),
a the acceleration and d the distance.
We will calculate the acceleration from this formula
a = (V² - V₀²) / (2 d) = (2.5² - 1²) / (2 · 5) = (6.25 - 1) / 10 = 5.25 / 10
a = 0.525 m/s²
then we use this formula
V = V₀ + a t => t = (V - V₀) / a = (2.5 - 1) / 0.525 = 1.5 / 0.525 = 2.86 seconds
t = 2.86 seconds
God is with you!!!
Final answer:
Using kinematic equations and given values of initial and final velocities, along with the distance covered, the swimmer took approximately 2.86 seconds to accelerate to 2.5 m/s.
Explanation:
A swimmer is swimming to the left with a speed of 1.0 m/s and then accelerates to a final speed of 2.5 m/s over a distance of 5.0 m.
To find the time taken to accelerate to 2.5 m/s, we can use the kinematic equation which relates initial velocity, final velocity, acceleration, and distance: [tex]v^2 = u^2 + 2as[/tex], where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement.
Substituting the given values, we can solve for a, and then use v = u + at to find the time, t.
First, solving for a:
[tex]2.5^2 = 1.0^2 + 2(a)(5.0)[/tex]
6.25 = 1 + 10a
a = [tex]0.525 m/s^2[/tex]
Then, solving for t:
2.5 = 1.0 + (0.525)t
t = 2.857 seconds.
So, the swimmer took approximately 2.86 seconds to speed up to 2.5 m/s.
Which two atmospheric gases do not react with many substances?
A.
Oxygen (O2)
B.
Argon (Ar)
C.
Nitrogen (N2)
D.
Carbon dioxide (CO2)
Answer:
the answer is B ( Argon (Ar) )
Answer:C and B
Explanation:
i hope this helps
The chart below shows the average surface temperature or temperature range for each of the eight planets.
Planet Temperature
Mercury 100–700 K
Venus 735 K
Earth 287 K
Mars 227 K
Jupiter 112–165 K
Saturn 84–134 K
Uranus 53–76 K
Neptune 55–72 K
What conclusion can be drawn from this information?
A.
Earth and the other inner planets have higher average surface temperatures than the outer planets.
B.
Earth and the other inner planets have lower average surface temperatures than the outer planets.
C.
Earth has the lowest average surface temperature, and Venus has the highest average surface temperature.
D.
Earth has the highest average surface temperature, and Uranus has the lowest average surface temperature.
Answer:
A) Earth and the other inner planets have higher average surface temperatures than the outer planets.
Explanation:
the earth and the other inner planets have higher average surface temperatures than the outer planets.
The reason for this response is due to the distance between the sun and the respective planet, the source of energy generation is the sun and the only way in which the temperature increase of each planet is guaranteed is by radiation, the further away a planet is from its star, its temperature will decrease. Although it is also important to highlight the atmospheric composition of the planet if this planet in its stratosphere has high density clouds that do not allow the entry of solar radiation, the temperature of the planet's surface will not increase, independent of the distance from the sun, but these are more complex cases where specialists in that area enter to perform a study in detail.
A. The conclusion is that Earth and the other inner planets have higher average surface temperatures than the outer planets.
Explanation:The conclusion that can be drawn from the information provided is that Earth and the other inner planets have higher average surface temperatures than the outer planets.
This can be seen by comparing the temperature ranges of the inner planets (Mercury, Venus, Earth, and Mars) with the temperature ranges of the outer planets (Jupiter, Saturn, Uranus, and Neptune). The inner planets have higher average temperatures compared to the outer planets.
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What causes sedimentary rock to change into metamorphic rock
Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.
Hope this helps, if not, comment below please!!!!
Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.
Hope this helps, if not, comment below please!!!!
define a diode in semiconductor
Answer:
A semiconductor diode is a diode produced and made of its semiconductor material, which is more likely and most of the time silicon. It's similar and kind of like a door for electricity to move through, but the thing is it only opens one way.
Explanation:
A diode is a device for controlling electrical currents so that they flow the desired way. (Pretty much the way the engineer wants them to.)
A baseball is moving at a speed of 2.2m/s when it strikes the catchers glove. The paddding of the glove is compressed by 24mm before the ball comes to a stop. We want to find the average acceleration of the baseball while its compressing the glove
The average acceleration of the baseball while it's compressing the glove can be calculated using the equation of motion. This results in an acceleration of -101.66 m/s^2, indicating the ball is slowing down.
Explanation:The question about finding the average acceleration of a baseball while it's compressing the catcher's glove pertains to a physics concept. We are told that the baseball is moving at a speed of 2.2 m/s when it strikes the glove, and it comes to a stop by compressing the glove by 24mm.
We can use the equation of motion: Final velocity^2 = Initial velocity^2 + 2*(Acceleration*Distance). Here, the final velocity of the baseball is zero (as it comes to a stop), the initial velocity is 2.2 m/s, and the distance is 24mm (or 0.024m, as we need to express the distance in the same unit).
Therefore, the average acceleration of the baseball is - (Initial velocity^2) / (2*Distance) = - (2.2^2) / (2*0.024) = -101.66 m/s^2. The negative sign indicates the acceleration is in the opposite direction of the ball's motion, which is expected as it's slowing down and eventually coming to a stop.
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