Explanation:
13 cmHg (centimeters of mercury) is the pressure at the bottom of a column of mercury 13 cm deep. It is the equivalent of about 17.3 kPa or 2.5 psi.
Graphs are representations of equations.
A. True
B. False
Answer:
Hi there!
The answer is: A. True
Which statement correctly describes the relationship between frequency and wavelength?
As the frequency of a wave increases, the longer its wavelength is.
As the frequency of a wave increases, the shorter its wavelength is.
As the frequency of a wave increases, its wavelength remains the same.
For a wave:
v = fλ
v is the velocity, f is the frequency, and λ is the wavelength.
Assuming the velocity of the wave doesn't change...
If you increase its frequency, its wavelength will shorten.
Answer:
As the frequency of a wave increases, the shorter its wavelength is.
Explanation:
Which is not a factor in a fossil organism being useful as an index fossil? It must have lived through a long span of time. It must be widespread geographically. It must be abundant. It must be limited to a short span of geologic time.
Answer:
it must have lived through a long span of time
Answer:Option (1)
Explanation: Index fossil are those fossils that appears for a very short period of time in the geological time scale and has a wide geographical distribution. For example, Ammonites.
Index fossils are a good source for rock age determination and also it helps in the correlation of rocks.
Thus, the correct answer is option (1).
What is a hypothesis?
a. a report of the findings of scientific experiments
b. use of isolated facts to reach a general idea that may explain a phenomenon
c. a general statement made to infer a specific conclusion, often in an “if. . . then” format.
d. a tentative statement, based on data, that can be used to guide further observations and experiments
Need help with science questions!
Which best describes how the law of conservation of energy is obeyed in this closed physical system?
A.
The final mechanical energy of the system is the difference between the original mechanical energy of the system and the change in mechanical energy of the system (ΔE). When the piston does work (W), only the mechanical energy added to the system (Q) is transferred to kinetic energy.
B.
The final thermal energy of the system is the sum of the original internal energy of the system and the change in energy of the system (ΔE). When the piston does work (W), all the thermal energy is transferred to kinetic energy.
C.
The final mechanical energy of the system is the sum of the original internal energy of the system and the change in energy of the system (ΔE). When the piston does work (W), all the mechanical energy is transferred to kinetic energy.
D.
The final thermal energy of the system is the difference between the original internal energy of the system and the change in energy of the system (ΔE). When the piston does work (W), only the thermal energy added to the system (Q) is transferred to kinetic energy.
Explanation:
B.
The final thermal energy of the system is the sum of the original internal energy of the system and the change in energy of the system (ΔE). When the piston does work (W), all the thermal energy is transferred to kinetic energy.
The law of conservation of energy states that the total energy of a closed system remains constant over time. This includes both mechanical and thermal energies, where mechanical energy is the sum of kinetic and potential energy, and is conserved in the absence of external forces. The first law of thermodynamics encompasses this principle through the statement that the change in internal energy of a system is equal to the heat added to the system plus the work done on it. So the correct option is A.
Explanation:The law of conservation of energy in a closed physical system indicates that the total energy within the system remains constant over time. This concept is articulated in the question which concerns how mechanical and thermal energies are conserved within such a system. To clarify, none of the answer choices directly match the principles of energy conservation as generally understood in physics. However, using the information provided, we can explore the principles relevant to the question.
In a closed system, mechanical energy, which includes both kinetic and potential energy, is conserved unless acted upon by external forces. If a piston does work (W), it may convert some of the system's internal energy to kinetic energy, but the total mechanical energy of the system will not change. This aligns with the principle that during any process, the change in a system's mechanical energy will be equal to the work done on the system minus any heat transfer (Q).
According to the first law of thermodynamics, the change in internal energy of a system (ΔE) is equal to the heat added to the system (Q) plus the work done on the system (W). This statement encompasses the conservation of thermal energy as part of the system's total energy. The energy may shift between mechanical and thermal forms, but the total remains the same.
Therefore, the interpretation of the law of conservation of energy should reflect these ideas, and none of the answer choices provided perfectly do so. The closest is perhaps option A, which mentions the transfer of mechanical energy and the work done by the piston, but the phrasing about energy differences is not accurate.
Isabella drops a pen off her balcony by accident while celebrating the successful completion of a physics problem.
Assuming air resistance is negligible, how many seconds does it take the pen to reach a speed of 19.62 \,\dfrac{\text {m}}{\text s}19.62
s
m
19, point, 62, space, start fraction, m, divided by, s, end fraction?
Answer:
2 seconds
Explanation:
v = at + v₀
19.62 m/s = (9.81 m/s²) t + 0 m/s
t = 2 s
the wavelength of light is 4000A then the number of waves in 1 mm is
Answer:
2500
Explanation:
1 Angstrom (1 A) corresponds to
[tex]1 A = 10^{-10} m[/tex]
Therefore we can convert the wavelength of the light from Angstroms to meters:
[tex]\lambda = 4000 A = 4000 \cdot 10^{-10} m = 4\cdot 10^{-7} m[/tex]
We also know that
[tex]1 mm = 1\cdot 10^{-3} m[/tex]
So the number of waves in 1 mm of distance is:
[tex]n=\frac{1\cdot 10^{-3} m}{4\cdot 10^{-7} m}=2500[/tex]
give two mathematical examples of Newton's third law and how you get the solution
Answer:
1) Any particle moving in a horizontal plane slowed by friction, deceleration = 32 μ
2) The particle moving by acceleration = P/m - 32μ OR The external force = ma + 32μm
Explanation:
* Lets revise Newton’s Third Law:
- For every action there is a reaction, equal in magnitude and opposite
in direction.
- Examples:
# 1) A particle moving freely against friction in a horizontal plane
- When no external forces acts on the particle, then its equation of
motion is;
∵ ∑ forces in direction of motion = mass × acceleration
∵ No external force
∵ The friction force (F) = μR, where μ is coefficient of the frictional force
and R is the normal reaction of the weight of the particle on the
surface
∵ The frictional force is in opposite direction of the motion
∴ ∑ forces in the direction of motion = 0 - F
∴ 0 - F = mass × acceleration
- Substitute F by μR
∴ - μR = mass × acceleration
∵ R = mg where m is the mass of the particle and g is the acceleration
of gravity
∴ - μ(mg) = ma ⇒ a is the acceleration of motion
- By divide both sides by m
∴ - μ(g) = a
∵ The acceleration of gravity ≅ 32 feet/sec²
∴ a = - 32 μ
* Any particle moving in a horizontal plane slowed by friction,
deceleration = 32 μ
# 2) A particle moving under the action of an external force P in a
horizontal plane.
- When an external force P acts on the particle, then its equation
of motion is;
∵ ∑ forces in direction of motion = mass × acceleration
∵ The external force = P
∵ The friction force (F) = μR, where μ is coefficient of the frictional force
and R is the normal reaction of the weight of the particle on the
surface
∵ The frictional force is in opposite direction of the motion
∴ ∑ forces in the direction of motion = P - F
∴ P - F = mass × acceleration
- Substitute F by μR
∴ P - μR = mass × acceleration
∵ R = mg where m is the mass of the particle and g is the acceleration
of gravity
∴ P - μ(mg) = ma ⇒ a is the acceleration of motion
∵ The acceleration of gravity ≅ 32 feet/sec²
∴ P - 32μm = ma ⇒ (1)
- divide both side by m
∴ a = (P - 32μm)/m ⇒ divide the 2 terms in the bracket by m
∴ a = P/m - 32μ
* The particle moving by acceleration = P/m - 32μ
- If you want to fin the external force P use equation (1)
∵ P - 32μm = ma ⇒ add 32μm to both sides
∴ P = ma + 32μm
* The external force = ma + 32μm
A vector quantity is always the same as a scalar quantity.
True or false
Answer:
false
Explanation:
because
scalar quantity :has only magnitude but no direction
vector quantity : has both magnitude and direction
Which statement best explains why Earth is not a perfect sphere?
Earth revolves too quickly around the Sun
Earth's spin on its axis causes the equator to bulge
The circumference of the Earth is greater at its poles
The gravity of the moon changes Earth's shape
Answer:
Earth's spin on its axis causes the equator to bulge
Explanation:
The Earth is not a perfect sphere but an oblate ellipsoid. The force that holds a planet is gravity. The Earth is rotating on its axis at a speed of 460 m/s at the equator. Due to this reason there is a build up of centrifugal force on the Earth which causes it to expand giving it a bulge.
The Sun and the Moon's gravity causes waves on the surface of large water bodies.
How is the solubility of a solid affected by temperature?
How is the solubility of a solid affected by temperature?
A) As temperature goes up, the solubility goes up.
B) As temperature goes down, the solubility goes down.
C) As temperature goes up, the solubility goes down.
D) As temperature goes down, the solubility goes up.
E) both A and B
Answer:
E
Explanation:
As temperatures go up solids become more towards the next state of matter, liquid which is very soluable (like mixing drinks). while as it gets colder, solids become more solid, the atoms come closer together which forms stronger bonds between them so they don't want to mix as well. Solids, for the most part can only become more solid as it gets colder, unless you count bohrs-einstein conisates
what is conduction ?
Explanation:
the process by which heat or electricity is directly transmitted through the material of a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
Final answer:
Conduction is the process of transferring heat through direct contact between two objects at different temperatures, as seen when you hold a glass of ice water or cook a steak on a skillet.
Explanation:
Conduction is the process of heat transfer through stationary matter by means of physical contact. Heat essentially moves from a higher temperature region to a lower temperature one within the material. It's the same mechanism at play when an electric burner transfers heat to the bottom of a pan, where the particles in the pan attain energy from the particles of the burner by direct contact.
A common experience with conduction is when you hold a glass of ice water and the heat from your hand is transferred to the glass, subsequently melting the ice.
Conduction is also a key process during cooking when, for example, a steak absorbs heat from a hot iron skillet. In both scenarios, heat is conveyed by the energetic motion and collision of particles from a warmer body (the hand or the skillet) to a colder one (the glass or the steak)
A ball is launched horizontally at 150 m/s from a cliff. What is its initial vertical velocity? A. 30 m/s B. 50 m/s C. 150 m/s D. 0 m/s
NEED HELP ASAP!!!!!!
Final answer:
The correct answer is D. 0 m/s. This is because the ball has no initial vertical velocity when launched horizontally from a cliff.
Explanation:
The initial vertical velocity for a ball launched horizontally from a cliff would be 0 m/s. This is because when an object is thrown horizontally, it means that all of its initial velocity is in the horizontal direction, and thus it has no initial vertical velocity.
Looking at our options:
A. 30 m/sB. 50 m/sC. 150 m/sD. 0 m/s - Correct Answer.
The photons of different light waves:
contain the same amount of energy.
operate at the same frequency.
contain different amounts of energy.
are created through the separation of protons from the nucleus of an atom.
Answer: contain different amounts of energy
Explanation:
The energy [tex]E[/tex] of a photon is given by:
[tex]E=h\nu[/tex]
Where:
[tex]h=6.626(10)^{-34}\frac{m^{2}kg}{s}[/tex] is the Planck constant
[tex]\nu[/tex] is the frequency of the light which is inversely related to the wavelength.
Now, if we have photons of different light waves, this means we have photons with different frequencies.
As the energy of the photon depends on its frequency:
Photons of different light waves contain different amounts of energy.
Photons of different light waves carry different amounts of energy that are proportional to their frequency.
Photons of different light waves contain different amounts of energy. The energy of a photon is proportional to its frequency. A high-frequency wave carries higher energy photons, while a low-frequency wave carries lower energy photons.
A force of 20N acts on a particle of mass 2 Kg and displaces it by
5m at an angle 30°. What is the work done?
Answer:
86.6Nm(j)
Explanation:
we know,
w=Fd
w=17.32*5
w=86.6Nm.
as we know the distance but we doesnot know the exact force .becauseit acts at an angle.This mean the orginal force of 20N is essentially split up in 2 direction in along axis of displacement ,and perpendincular direction that occur at 30degree angle.
the resultant displacement of object is along a line inclined by 30 degrees of that orginal plane ,then the force acting in the direction of that displacement equal to 20*cos30.I.e,17.32 .
What's the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20m/s?
Thank you,
Marilyn
Ek = 6KJ.
In physics, the kinetic energy of a body or object is the one that owns due to its movement and is given by the equation [tex]E_{k} = \frac{1}{2} mv^{2}[/tex], where m is the mass of the object in kilograms and v is the velocity in m/s.
An object that it has a mass of 30 kilograms and moves with a velocity of 20m/s, its kinetic energy is given by:
[tex]E_{k} = \frac{1}{2} (30kg)(20m/s)^{2}=6000J=6KJ[/tex]
A temperature of a 50 kg block increases by 15°C when 337,500 J of thermal energy are added to the block.
a. What is the specific heat of the object? show your work with units.
Explanation:
Heat = mass × specific heat × temperature change
q = m C ΔT
Given:
q = 337500 J
m = 50 kg
ΔT = 15°C
Substitute:
337500 J = (50 kg) C (15°C)
C = 450 J/kg/°C
Specific heat is usually recorded in J/g/°C or kJ/kg/°C. Converting:
C = 0.45 J/g/°C = 0.45 kJ/kg/°C
Final answer:
The specific heat of the object is calculated using the formula Q = mcΔT. Upon substituting the values provided into the formula and rearranging it to solve for specific heat (c), we determine that the specific heat of the object is 450 J/kg°C.
Explanation:
To calculate the specific heat of the object, we use the formula:
Q = mcΔT
Where:
Q is the amount of heat added, in joules
m is the mass of the object, in kilograms
c is the specific heat capacity, in J/kg°C
ΔT is the change in temperature, in degrees Celsius (or Kelvin, since the change is the same in both scales)
We are given the following values:
Q = 337,500 J
m = 50 kg
ΔT = 15°C
We rearrange the formula to solve for c:
c = Q / (mΔT)
Plugging in the values:
c = 337,500 J / (50 kg × 15°C)
c = 337,500 J / 750 kg°C
c = 450 J/kg°C
Therefore, the specific heat of the object is 450 J/kg°C.
Who were the first people on the moon?
Answer:
Neil Armstrong and Pilot Buzz Aldrin.
Explanation:
Neil Armstrong and Pilot Buzz Aldrin were the first people on the moon.
This happened on July 20, 1969, at 8:17.
Which of the following is an example of an indirect observation?
a. A scientist counts the exact number of snakes in a field.
b. scientist traps fish and
estimates the population of male and female fish based on the ratios of fish he trapped.
c. A scientist counts every frog in a pond.
Answer:
B
Explanation:
The other two choices are exact. B is estimating and giving an indirect observation.
b. scientist traps fish and
estimates the population of male and female fish based on the ratios of fish he trapped.
The key word is estimate. Estimate means that he gives a rough number. There aren't exactly that number of fish.
A. and C. are both exact numbers because the scientists manually count each one. This means these are direct observations, and therefore not the answer.
Hope this helped!
~Just a girl in love with Shawn Mendes
i) sin^2 A sec^2 B + tan^2 B cos^2 A = sin^2A + tan²B
Explanation:
sin² A sec² B + tan² B cos² A
A good first step is to write everything in terms of sine and cosine.
sin² A / cos² B + sin² B cos² A / cos² B
The fractions have the same denominator, so combine into one:
(sin² A + sin² B cos² A) / cos² B
Using Pythagorean identity, we can rewrite sin² B as 1 − cos² B:
(sin² A + (1 − cos² B) cos² A) / cos² B
Distribute:
(sin² A + cos² A − cos² B cos² A) / cos² B
Pythagorean identity:
(1 − cos² B cos² A) / cos² B
Now divide into two fractions again:
1 / cos² B − cos² B cos² A / cos² B
Simplify:
sec² B − cos² A
Using Pythagorean identity again:
(tan² B + 1) − (1 − sin² A)
tan² B + 1 − 1 + sin² A
tan² B + sin² A
What is a real life situation that demonstrates 1st Newton law for an object in move?
What happens to the frequency of a wave if its energy increases?
A.
The frequency and energy of a wave are not related.
B.
The frequency of the wave increases.
C.
The frequency of the wave decreases.
D.
The frequency constantly varies.
Explanation:
the frequency of the wave increase is the right answer
calculate the acceleration of an apple of mass 200gm,when it falls towards earth.also find the acceleration of the earth towards the apple.(given mass of earth=6*10^24 kg& radius of earth= 6.64*10^6m)
Answer: [tex]a_{apple}=9.082m/s^{2}[/tex], [tex]a_{Earth}=3.027(10)^{-25}m/s^2[/tex]
Explanation:
According to Newton’s law of universal gravitation, which is a classical physical law that describes the gravitational interaction between different bodies with mass:
[tex]F=G\frac{Mm}{r^2}[/tex] (1)
Where:
[tex]F[/tex] is the module of the force exerted between the apple and the Earth
[tex]G=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}[/tex] is the universal gravitation constant.
[tex]M=6(10)^{24}kg[/tex] is the mass of the Earth and [tex]m=200g=0.2kg[/tex] is the mass of the apple
[tex]r=6.64(10)^{6}m[/tex] is the distance between the apple and the Earth (assuming tha apple is near the surface of the Earth)
On the other hand, according Newton's 2nd Law of Motion the force [tex]F[/tex] is directly proportional to the mass [tex]m[/tex] and to the acceleration [tex]a[/tex] of a body.
So, in the case of the apple:
[tex]F=m.a_{apple}[/tex] (2)
[tex]a_{apple}=\frac{F}{m}[/tex] (3)
Substituting [tex]F[/tex] (1) in (3):
[tex]a_{apple}=\frac{F}{m}=G\frac{M}{r^2}[/tex] (4)
[tex]a_{apple}=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}\frac{6(10)^{24}kg}{(6.64(10)^{6}m)^2}[/tex] (5)
[tex]a_{apple}=9.082m/s^2[/tex] (6)
Now, in the case of the Earth:
[tex]F=M.a_{Earth}[/tex] (7)
[tex]a_{Earth}=\frac{F}{M}[/tex] (8)
Substituting [tex]F[/tex] (1) in (8):
[tex]a_{Earth}=\frac{F}{M}=G\frac{m}{r^2}[/tex] (9)
[tex]a_{Earth}=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}\frac{0.2kg}{(6.64(10)^{6}m)^2}[/tex] (10)
[tex]a_{Earth}=3.027(10)^{-25}m/s^2[/tex] (11)
As we can see, the acceleration of the apple towards the Earth is greater than the acceleration of the Earth towards the apple (although the gravitational force between them is the same), because the mass of the Earth is greater than the mass of the apple.
what is the distance from The sun to Jupiter?
The distance between the Sun and the Jupiter is nearly 779 million kilometer.
Explanation:
Jupiter is approximately 778.5 million kilo meter from the Sun, it is in approximation of 484 million miles. To be exact in separating distance between the two, it is 778547200 kilo meters.
The distance measured is an average taken due to the elliptical path undertaken by the planet for its planetary motion around the Sun, according to the Kepler’s law of planetary motion.
A 150 g egg is dropped from 3.0 meters. The egg is
moving at 4.4 m/s right before it hits the ground The egg
comes to a stop in 0.072 seconds.
What is the magnitude of force that the ground exerted on
the egg?
0.66 N
9.2N
13N
180 N
Answer:
9.2 N
Explanation:
F = ma
F = m Δv / Δt
F = (0.150 kg) (4.4 m/s − 0 m/s) / 0.072 s
F = 9.2 N
Answer:
9.2Newtons
Explanation:
Just got it right on edg
A golf ball is at rest on the grass when a golfer walks up and applies 10 N of force to it. There is 2 N of friction, resulting in 8 N of net force. What will happen to the ball? (4 points)
It will remain at rest.
It will move in the direction opposite the net force.
It will move slowly at first, then speed up.
It will move in the direction of the net force.
Answer:
The forth one
Explanation:
8N of net force is applied to the golf ball
the weigth of a body decrease in a coal mine why?
Answer
Gravitational force is between two object caused by energy in mass. Here when you are in a mine the radius of the earth in case of calculating gravity is reduced to the length between you and the center.
This means the mass of earth is decreasing even though the distance is decreasing. Relative to the decrease in distance squared the decrease in the mass of the second object(earth) is more. As a result your weight decreases.
Answer:
Explanation: that means as you descend into the earth, all of the mass in all the shells above you gets canceled. If the centre of the earth were not molten iron, but instead hollowed out, you would be weightless inside.
The physics problem is actually a little more general. It applies to inverse square force laws such as the electrical force. So if you put an electron inside a positively or negatively charged sphere, it will also have a net force on it of zero.
You have 30.0 L of gasoline. How many gallons is this? (1 L equals about 0.264 gallons).
Answer:7.92 gallons
Explanation:
From your data, what factor(s) affect the speed of a wave? Explain your reasoning.
wavelength frequency and other
Explanation:
Waves travel through a medium: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).
Final answer:
The speed of a wave depends primarily on the medium's characteristics, such as elasticity, inertia, pressure, density, and temperature for sound waves, and tension and linear mass density for waves on a string.
Explanation:
The speed of a wave is influenced by the properties of the medium through which it propagates. Factors such as the elasticity of the medium and the inertia of its particles, which are measures of the medium's ability to return to equilibrium and the mass of the particles, respectively, play significant roles in determining wave speed. The speed is not dependent on the wave's amplitude or the energy of the generating mechanism but on the medium's physical properties. For example, the speed of sound waves is affected by the density, pressure, and temperature of air, while the speed of a wave on a string is proportional to the square root of the tension in the string and inversely proportional to the square root of the linear mass density. The wave speed can therefore be experimentally determined using its relationship with the medium's properties.
a piece of stone is thrown up from a height of 25 meters above the ground. after 2 seconds the stone reaches the highest point.
A = Calculate the starting speed
B = Calculate the maximum height from the ground
C = Calculate at what time the stone hits the ground
D = Calculate the speed of the stone on time = 4 Seconds
please can someone help me solve this
Answer:
A. 19.6 m/s
B. 44.6 m
C. 5.0 s
D. -19.6 m/s
Explanation:
At the highest point, the stone's velocity is 0.
A. Given:
v = 0 m/s
t = 2 s
a = -9.8 m/s²
Find: v₀
v = at + v₀
0 = (-9.8)(2) + v₀
v₀ = 19.6 m/s
B. Given:
y₀ = 25 m
t = 2 s
v₀ = 19.6 m/s
a = -9.8 m/s²
Find: y
y = y₀ + v₀ t + ½ at²
y = 25 + (19.6)(2) + ½(-9.8)(2)²
y = 44.6 m
C. Given:
y₀ = 25 m
y = 0 m
v₀ = 19.6 m/s
a = -9.8 m/s²
Find: t
y = y₀ + v₀ t + ½ at²
0 = 25 + (19.6)t + ½(-9.8)t²
0 = 4.9t² − 19.6t − 25
t ≈ 5.0 s
D. Given:
v₀ = 19.6 m/s
a = -9.8 m/s²
t = 4 s
Find: v
v = at + v₀
v = (-9.8)(4) + 19.6
v = -19.6 m/s
The velocity is -19.6 m/s. If you want the speed, or magnitude of the velocity, take the absolute value: 19.6 m/s.