According to the definition of mechanical work, pushing on a rock accomplishes no work unless there is
According to the definition of mechanical work, the pushing on a rock accomplishes no work done unless there is a movement in the same direction as the direction of the force.
What is Mechanical work?Mechanical work is the amount of energy which is transferred by a force that is applied on the object. Like that of other energies, it is a scalar quantity, with the SI units of joules. The heat conduction is not considered to be a form of work done, since there is no macroscopically measurable force, only microscopic forces occurring in atomic collisions.
According to the definition of mechanical work, the pushing on a rock accomplishes no work unless there is a movement in the same direction as that of the direction of the force applied.
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Brian stresses a mineral. It breaks cleanly and evenly, leaving a smooth surface. The cleavage can be described as _____.
none
perfect
poor
metallic
The answer is B. Perfect.
Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave background (CMB)?
Answer: Plato users - B. radio telescope
Explanation: just took test
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Describe Newton's First Law of motion. Provide an example to support your explanation.
You plug in an extension cord and you have to be very careful around electrical outlet. However you can handle his extension cord without worry of being shot by the electrical charge which statement best explains why you can do this
An object is dropped onto the moon (gm = 5 ft/s2). How long does it take to fall from an elevation of 250 ft.?
Ammonia reacts with oxygen according to the equation 4nh3(g)+5o2(g)→4no(g)+6h2o(g),δhrxn=−906 kj calculate the heat (in kj) associated with the complete reaction of 155 g of nh3. express the heat in kilojoules to three significant figures.
Answer:
-2065
Explanation:
155 g of ammonia (NH3) to moles:
155 g / 17 g/mol = 9.118
Given: The ratio includes 4 moles of ammonia and -906 kJ of energy.
Therefore, to find the heat, multiply the moles of ammonia by ratio of energy to moles in the formula.
[tex]9.118*\frac{-906}{4} =-2065.2[/tex]
OR
[tex]-2.06*10x^{3}[/tex]
To calculate the heat associated with the complete reaction of 155 g of NH3, convert the mass of NH3 to moles, use stoichiometric coefficients to calculate the number of moles of heat produced, and calculate the heat associated with the reaction.
Explanation:To calculate the heat associated with the complete reaction of 155 g of NH3, we need to first convert the mass of NH3 to moles:
Molar mass of NH3 (1 mol of N + 3 mol of H) = 14.01 g/mol + 1.01 g/mol * 3 = 17.03 g/mol
Number of moles of NH3 = 155 g / 17.03 g/mol = 9.11 mol
Next, we use the stoichiometric coefficients in the balanced equation to calculate the number of moles of heat produced:
From the balanced equation, we see that 4 moles of NH3 produce 6 moles of H2O and release -906 kJ of heat.
So, 9.11 moles of NH3 produce (9.11 mol * 6 mol H2O / 4 mol NH3) = 13.665 mol H2O.
Finally, we calculate the heat associated with the complete reaction of 155 g of NH3:
Heat = (13.665 mol H2O * -906 kJ / 6 mol H2O) = -2048.05 kJ.
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If a 70-kg swimmer pushes off a pool wall with a force of 250 N, what is her acceleration?
Answer:
5m
Explanation:
The acceleration of the swimmer is 3.57 meters per second squared, calculated by dividing the force (250 N) by the swimmer's mass (70 kg) using Newton's second law.
To calculate the acceleration of the 70-kg swimmer who pushes off the pool wall with a force of 250 N, we use Newton's second law of motion, which is stated as F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. To find the acceleration, we rearrange the formula to a = F / m.
Therefore, the acceleration a of the swimmer can be calculated by dividing the force by the mass of the swimmer:
a = F / m = 250 N / 70 kg = 3.57 m/s2
This means the swimmer's acceleration is 3.57 meters per second squared.
A person on another planet shines a flashlight at you. The planet and the earth are both in the same reference frame and are not moving relative to each other. At the same instant that the person shined the flashlight at you, a person on a spaceship passing that planet and moving toward you at 0.5 c also shined a flashlight at you. Which light pulse will reach you first?
A. the light from the person on the planet
B. the light from the flashlight on the spaceship
C. the two light pulses will reach you at the same time.
The light pulse that will reach you first is: (C). the two light pulses will reach you at the same time.
Meaning of light and light pulseLight according to physics can be defined as electromagnetic radiations that are visible to the eyes. Light speed in a vacuum is always constant and currently the speed of light in air is 3 * [tex]10^{8}[/tex] m/s
A light pulse is defined as an optical pulse of flashes of light.
In conclusion, The light pulse that will reach you first is the two light pulses will reach you at the same time, since the light was sent at the same distance.
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How many electrons do carbon and oxygen share?
A carbon atom and an oxygen atom share four electrons in a double covalent bond in a molecule of carbon dioxide to achieve stability.
Explanation:The carbon and oxygen atoms share electrons through covalent bonding, which is a type of chemical bond where atoms share pairs of electrons. In the case of carbon dioxide (O=C=O), a molecule consisting of a single carbon atom and two oxygen atoms, there are two double covalent bonds to achieve stability. Each double bond involves the sharing of two pairs of electrons (four electrons in total) between the carbon and oxygen atoms. Hence, this indicates that a carbon atom and an oxygen atom share four electrons in a double covalent bond.
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what is the formula for dichlorine heptoxide
The imaginary line from the tip of the football to the football to the sideline is called
The line is a conceptual 'line of sight' from the football to the sideline, and a yard, used for measurements on the field, is equal to three feet; this standardization ensures fairness in football games.
The imaginary line from the tip of the football to the sideline in a football game is often referred to as a line of sight or simply directional line. This is not a technical term defined in the rules of football, but rather a conceptual way to describe that specific direct path. When discussing measurements within the context of a football field, it is important to understand the length of a yard. A yard is a standard unit of linear measure equal to three feet. Moving the ball ten yards leads to a first down and this distance is consistent across all professional football fields, ensuring the game's uniformity.
A bike rider pedals with constant acceleration to reach a velocity of 7.5 (vf)m/s over a time of 4.5 s(t). during the period of acceleration, the bike's displacement is 19 m(d). what was the initial velocity of the bike?
To find the initial velocity of the bike rider, we can use the kinematic equation: vf = vi + at. Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity.
Explanation:To find the initial velocity of the bike rider, we can use the kinematic equation:
vf = vi + at
Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity:
vi = vf - at
Substituting the given values, we get:
vi = 7.5 m/s - a * 4.5 s
Since the bike rider is pedaling with constant acceleration, we can assume that the displacement is given by:
d = vi * t + 0.5 * a * t^2
Substituting the given values, we get:
19 m = vi * 4.5 s + 0.5 * a * (4.5 s)^2
From these two equations, we have a system of equations that can be solved to find the initial velocity.
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To find the initial velocity of the bike with constant acceleration, we use kinematic equations that incorporate the given final velocity, acceleration time, and displacement. We calculate the acceleration first, and then solve for the initial velocity.
Explanation:Finding the Initial Velocity of the Bike
To determine the initial velocity of the bike, we can use the kinematic equation that relates initial velocity, final velocity, acceleration, displacement, and time:
vf = vi + at
d = vi*t + (1/2)at²
Given that the final velocity (vf) is 7.5 m/s, acceleration time (t) is 4.5 s, and displacement (d) is 19 m, we can solve for initial velocity (vi). Using the second equation, we rearrange to solve for vi:
vi = (d - (1/2)at²) / t
We know the displacement and time, but we need to find acceleration (a) first. We use the first equation to find acceleration:
7.5 m/s = vi + a(4.5 s)
Since we don't have vi yet, we use this equation after finding acceleration with the displacement:
19 m = vi(4.5 s) + (1/2)a(4.5 s)�
From the above information, we can calculate acceleration. We'll then use that to find the initial velocity. With these calculations, the student will understand the steps to find the initial velocity of a bike when given its final velocity, acceleration time, and displacement.
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When responding to sound, the human eardrum vibrates about its equilibrium position. suppose an eardrum is vibrating with an amplitude of 5.65 10-7 m and a maximum speed of 2.68 10-3 m/s. (a) what is the frequency (in hz) of the eardrum's vibration? 745.92 hz (b) what is the maximum acceleration of the eardrum?
Bryce, a mouse lover, keeps his four pet mice in a roomy cage, where they spend much of their spare time–when they\'re not sleeping or eating–joyfully scampering about on the cage\'s floor. bryce tracks his mice\'s health diligently and just now recorded their masses as 0.0227 kg, 0.0217 kg, 0.0215 kg, and 0.0235 kg. at this very instant the x and y components of the mice\'s velocities are, respectively, (0.517 m/s, -0.493 m/s), (-0.603 m/s, -0.309 m/s), (0.373 m/s, 0.477 m/s), and (-0.853 m/s, 0.955 m/s). calculate the x and y components of bryce\'s mice\'s total momentum, px and py.
The x-component of the total momentum of Bryce's mice is approximately -0.01299 kg⋅m/s, and the y-component is approximately -0.12702 kg⋅m/s.
Calculate the momentum of each mouse:
The momentum (p) of an object is given by the product of its mass (m) and velocity (v):
For the first mouse:
p1 = (0.0227 kg) × (0.517 m/s) = 0.0117439 kg⋅m/s in the x-direction, and
p1 = (0.0227 kg) × (-0.493 m/s) = -0.0112261 kg⋅m/s in the y-direction.
Sum up the momenta for each direction:
For the x-component:
px = p1x + p2x + p3x + p4x
px = (0.0117439 kg⋅m/s) + (-0.0121411 kg⋅m/s) + (0.0077545 kg⋅m/s) + (-0.0203475 kg⋅m/s)
px ≈ -0.01299 kg⋅m/s
Calculate the final values:
For the y-component:
py = p1y + p2y + p3y + p4y
py = (-0.0112261 kg⋅m/s) + (-0.0182619 kg⋅m/s) + (0.0102783 kg⋅m/s) + (0.022034 kg⋅m/s)
py ≈ -0.12702 kg⋅m/s
The alarm at a fire station rings and an 86-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.0 m). just before landing, his speed is 1.4 m/s. what is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole?
The magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole is 76.6 N.
To find the kinetic frictional force, we first need to calculate the work done by friction during the fireman's slide. This can be found using the work-energy principle, where the work done equals the change in kinetic energy. The kinetic energy just before landing is given by (1/2)mv2, where m is the mass (86 kg) and v is the velocity (1.4 m/s). The potential energy lost during the descent is mgh, where g is the acceleration due to gravity (9.8 m/s2) and h is the distance (4.0 m). The work done by friction is the difference between the initial potential energy and final kinetic energy. Solving these gives the frictional force as the work done by friction divided by the distance traveled down the pole.
which formula represents Gay-Lussac's law?
The formula for this law is P1/T1 = P2/T2. Temperatures must always be expressed in kelvins when using gas laws.
Gay-Lussac's Law, also known as Amontons' law, states that the pressure of a gas is directly proportional to its absolute temperature, provided that the volume and amount of gas remain constant. The mathematical expression for Gay-Lussac's Law is:
P1/T1 = P2/T2
where P1 and P2 are the initial and final pressures, and T1 and T2 are the initial and final absolute temperatures (in Kelvin). This means that if the temperature of a gas increases, its pressure also increases, as long as the volume does not change.
For example, if a gas in a sealed container is heated from 300 K to 600 K, its pressure will double assuming the volume of the container remains constant.
It is important to note that temperatures must always be expressed in kelvins when using gas laws. Gay-Lussac's Law is similar to Charles's Law but focuses on the relationship between temperature and pressure instead of temperature and volume.
The temperature in Chattanooga Tennessee is -3 Celsius The temperature in Sam’s hometown is 18° colder than that what is the temperature in Sam’s hometown?
The Temperature in Chattanooga, Tennessee is -3 °C, then the temperature in Sam's hometown will be equal to -21 °C.
What is temperature?A temperature is a unit of hotness or coldness that can be described in terms of a variety of arbitrary scales. It also indicates the direction in which thermal energy will naturally flow, i.e., from a hotter body to a region of lower temperature.
Temperature is not the same as the energy of the thermodynamic system; for instance, an iceberg has considerably higher heat than a burning match, but it has a far larger total heat energy than a match.
As opposed to extensive qualities like mass or volume, which are reliant on the amount of stuff being studied, the temperature is an intensive attribute, just like pressure or density.
As per the given information in the question,
The temperature in Chattanooga, Tennessee = -3 °C
The temperature in Sam’s hometown is 18° colder than that.
Then, the temperature in his hometown will be,
= -3 - 18
= -21 °C.
Therefore, the temperature in the hometown will be -21 °C.
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Organisms reproduce by two main methods. One is division, in which the animal divides and creates an exact copy of itself. Which term names the other main method of reproduction? A. combination B. fusion C. division D. fission
The term names the other main method of reproduction is : (B). Fusion
Meaning of reproductionReproduction can be defined as the act of producing off springs by a parent organism either by different means.
Reproduction is very important because it is the only means a species existence can continue and also it is the only way a race will not go extinct.
In conclusion, The term names the other main method of reproduction is Fusion
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How much does a 0.15 kg baseball weigh on earth?
The weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons, as we know that the value of the acceleration due to the gravity of the earth would be 1.47 Newtons .
What is gravity ?It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another .
As given in the problem we have to find out how much a 0.15 kg baseball weighs on earth .
The value of the acceleration due to gravity on the earth = 9.8 m / s²
The weight of the baseball on the earth = 0.15 × 9.8
= 1.47 Newtons
Thus, the weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons .
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What do peaked roofs, convertible tops, and airplane wings have in common when air moves faster across their top surfaces?
a penny is dropped from the top of the empire state building, a height of 381 meters. find the final velocity of the penny
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 193-kg laser sensor which measures the thickness of the ice (see the drawing). the helicopter and the sensor move only in the horizontal direction and have a horizontal acceleration of magnitude 2.31 m/s2. ignoring air resistance, find the tension in the cable towing the sensor.
What phenomenon causes the fuzzy image? What kind of lens is used to correct this, and how is it corrected?
Answer:
This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focuses at a common point.
Explanation:
This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focus at a common point.
What is chromatic aberration ?"Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength. There are two types of chromatic aberration: axial chromatic aberration and lateral chromatic aberration."
What is wavelength ?"Wavelength is the distance travelled by a particle on the wave when it completes one oscillation. Meters (m) is the SI unit. "Amplitude is the maximum distance covered by the particle from its mean position. The number of oscillations completed in unit time is known as frequency.
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For which property has Marvin forgotten to use an SI unit of measurement? A shore length B high temperature C low temperature D annual precipitation
When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3. Show your work.
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Newtons first law of motion tells us that an object will move___ unless acted on by an unbalanced force
What became stuck on the turtle's legs before it crossed the highway?
a doctor travels to the east from city a to city b 75 km in 1.0h and returns back in another hour
The average speed of the doctor is 75 km per hour and his average velocity should be zero.
Given that,
The distance should be 75 km.And, the time taken is 1.0 hours. Here we assume that we have to determine the speed.Based on the above information, the calculation is as follows:
We know that
[tex]Speed = \frac{Distance}{Time}\\\\= \frac{75}{1}[/tex]
= 75 km per hour
Therefore we can conclude that the average speed of the doctor is 75 km per hour and his average velocity should be zero.
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Adele is planning to paint the walls in her room over spring break. she studies several color samples and is trying to decide between yellow, green, and blue hues. what light wave attribute allows adele to differentiate between these colors?â
a. âthe amplitude of waves
b. âthe wavelength of the waves
c. âthe number of waves
d. âthe types of waves
Final answer:
The correct option is (b) the wavelength of the waves. Adele can differentiate between colors based on the wavelength of light waves. Color perception is linked to light's wavelength, with blue having shorter wavelengths, and red longer wavelengths. Therefore, wavelength is key in distinguishing between colors.
Explanation:
Adele is able to differentiate between the colors yellow, green, and blue in her room because of the wavelength of the light waves. Light that is visible to humans makes up only a small portion of the electromagnetic spectrum, and within this spectrum, color perception is directly linked to wavelength.
Longer wavelengths are associated with the color red, intermediate wavelengths with green, and shorter wavelengths with blue and violet colors. This explains why Adele perceives different colors, as each hue represents light of a specific range of wavelengths.
Thus, the correct answer to what light wave attribute allows Adele to differentiate between these colors is b. the wavelength of the waves.
When organizing colors by wavelength, from shortest to longest, it goes from blue to yellow to red. Conversely, when arranging according to frequency, which is inversely related to wavelength, the order is red (lowest frequency), yellow, and then blue (highest frequency).
This demonstrates the inverse relationship between wavelength and frequency in the electromagnetic spectrum.