When children use the word “doggie” to refer to every four-legged animal they see, __________ occurs.
Answer:
b trust me
Explanation:
A pair of sunglasses says that it keeps you from getting wrinkles around your eyes. what is the purpose of this claim?
A. To show an unbiased source
B. To get you to buy the sunglasses
C. To prove that the sunglasses work
D. To provide evidence
Manuel is holding a 5kg box how much force is he exerting on it
If an atom loses an electron, why would the resulting particle have a positive charge?
What is the change in potential energy of an energetic 72 kg hiker who makes it from the floor of death valley to the top of mt.whitney?
If the coefficient of skewness is equal to zero, the shape of the distribution is __________.
It is 6.00 km from your home to the physics lab. as part of your physical fitness program, you could run that distance at 10.0 km/hr (which uses up energy at the rate of 700 w ), or you could walk it leisurely at 3.00 km/hr (which uses energy at 290 w ).
For our statistical definition of entropy, we use the equation S = klnW. In this equation, what does k represent?
The entropy is the measure of change in the thermal energy of a system and K in the formula represents Boltzmann constant.
What is Entropy?Entropy is the measure of a system's thermal energy per unit of the temperature which is unavailable for doing any useful work. Because, work is obtained from the ordered molecular motion of the object, the amount of entropy is a measure of the molecular disorder, or the randomness of a system.
The entropy can be calculated by the formula:
S = klnW
where, k is the Boltzmann constant per molecule (particle), which is equal to 1.38 × 10⁻²³J/(K. particle). And, from this equation the entropy change of the object, ΔS, for a system can be related to the change in the number of microstates which is represented as:
ΔS = kln (Wfinal-Winitial)
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Your goal is to accelerate the particles to kinetic energy k. what minimum radius r of the cyclotron is required?
What are you calculating when you measure the disorder of a system?
A)enthalpy
B)efficiency
C)entropy
D)energy equilibrium
Answer:
C) Entropy
Explanation:
Entropy is defined as the quantitative disorder or randomness in the system. This concept is coming out of the system of thermodynamics which deals with the transfer of heat in the system.
There are some key features of entropy which are discussed below:
To decrease the entropy there must be supply of heat from the outside of the system.Entropy is defined as the measure of probability and the disturbance of molecules in the macroscopic system.Therefore, entropy is the measure of the disorder of a system.
How does the width of the visible spectrum compared to that of the entire electromagnetic spectrum?
The visible spectrum is a very small part of the electromagnetic spectrum, the entire electromagnetic spectrum ranges from extremely short gamma rays to very long radio waves. Thus, the visible spectrum constitutes only a tiny fraction of the total electromagnetic wavelengths.
The visible spectrum is just a small part of the entire electromagnetic spectrum. The electromagnetic spectrum includes all types of electromagnetic radiation, which travel in waves and vary greatly in their wavelengths.
The visible light portion covers wavelengths from about 400 to 700 nanometers (nm), which we perceive as the colors of the rainbow ranging from violet to red.In contrast, the entire electromagnetic spectrum spans a much broader range of wavelengths, from very short gamma rays (less than one picometer) to very long radio waves (up to kilometers in length). This means the visible spectrum constitutes only a tiny fraction of the total range of electromagnetic wavelengths. To put it into perspective, the electromagnetic spectrum covers about 20 orders of magnitude in wavelength, while the visible spectrum spans just a fraction of one order of magnitude.A car travels at uniform acceleration over a distance of 440.0 m. Its final velocity after 20.0 s is 33.0 m/s. What is its initial velocity?
Since it is a uniform accelerated motion, we can use the following SUVAT equation that relates initial velocity, final velocity, time and distance covered:
[tex]S=\frac{1}{2}(v_i +v_f)t[/tex]
where
S=440.0 m is the distance covered
vi is the initial velocity
vf=33.0 m/s is the final velocity
t=20.0 s is the time
Re-arranging the formula and substituting the data, we can find the initial velocity:
[tex]v_i = \frac{2S}{t}-v_f=\frac{2(440.0 m)}{20.0 s}-33.0 m/s=11.0 m/s[/tex]
A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. the scale reads 849 n. as the elevator moves up, the scale reading increases to 934 n, then decreases back to 849 n. the acceleration of gravity is 9.8 m/s 2 . find the acceleration of the elevator. answer in units of m/s 2 .
Actual weight W = mg = 849
N
mass m = 849 / g = 86.54
kg
apparent weight m ( a+ g ) = 934 N
(a + g) = 934 / m = 10.79
from this acceleration a = 10.79 - g
= 10.79-9.8
= 0.9827 m / s^ 2
What is the best definition of ETS reactions
A. A set of reactions that is used to create alcoholic beverages from grains
B. A set of tract that occurs in muscle cells when oxygen is absent
C. A set of reactions that is the primary route of ATP production in cells
D. A set of reactions that uses oxygen to break down glucose into purification acid
The distance between Earth and the Moon is about 384,400 kilometers. The distance can be written in scientific notation as a × 10b kilometers, where a = and b = .
Answer:
[tex]3.844 \cdot 10^5 km[/tex], where a = 3.844 and b=5.
Explanation:
A number can be written in scientific notation as follows:
[tex]a \cdot 10^b[/tex]
where it means that the number 'a' is multiplied by 10 to the power b.
Practically speaking, it means that in order to write a number in scientific notation, we must move the dot to the left by 'b' positions. In this problem, we have the following number:
384400 km
Therefore, we have to move the dot to the left by 5 position, so we get:
[tex]3.84400 \cdot 10^5 km[/tex]
and we can get rid of the '00' since they are meaningless:
[tex]3.844 \cdot 10^5 km[/tex]
Anything that has mass and volume is the definition of
True or false the amount of solar radiation an area receives is dependent on the angle of the energy and whether it is filtered through the atmosphere
Normal faults that come in pairs usually display the geological feature of _____.
monoclines
anticlines and synclines
horsts and grabens
fault-block mountains
If a rocket is propelled while in space, is the momentum of the rocket itself (not including the exhaust products) conserved?
No, momentum of the rocket itself will not be conserved as the net external force on the rocket itself is not zero.
Further explanation
When a rocket leaves the ground they need a huge amount of thrust to lift off from the ground. This is not an easy task to lift off from the ground due to the heavy weight of the rocket. Generally Liquid fuels are used as a propellant in the rocket.
Given:
A rocket is propelled in the space.
Concept:
The logic behind the momentum conservation is Newton’s third law.
A force is defined as the rate of change of momentum with respect to time.
Mathematically,
[tex]\boxed{\vec F = \dfrac{{d\vec p}}{{dt}}}[/tex]
If net external force on a particle is zero, the rate of change of momentum will be zero so momentum will be constant.
[tex]\vec p = {\text{constant}}[/tex]
Thus, we can say momentum will be conserved. One point should be noticed that momentum is a vector quantity so vector sum is used while summing together momentum of two or more bodies.
Now for an isolated system, net external force on an isolated system is zero; therefore momentum is conserved for an isolated system.
When exhaust gases leaves the engine downward with a very high velocity, it exerts a reaction force on the rocket in upward direction. The action and reactions are equal in magnitude but the direction is opposite to each other. So if we consider rocket and exhaust gases as a system net force on the system will be zero and momentum will be conserved for (rocket+exhaust) system.
But if rocket itself is taken as a system, a reaction force (say N) acts on the rocket in upward direction which is responsible for lift off the rocket, therefore momentum cannot be conserved.
Thus, the momentum of the rocket itself will not be conserved as the net external force on the rocket itself is not zero.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Laws of motion
Keywords:
Rocket, propelled, space, momentum, not, conserved, reaction, upward, direction, balanced, force on rocket, launch, exhaust gas, rocket propulsion, momentum conservation.
An object is dropped from a 15 m ledge. How fast it is moving just before it hits the ground?
Answer:
[tex]v_f = 17.15 m/s[/tex]
Explanation:
Since the ball is dropped from the height
h = 15 m
so here initial speed of the ball is
[tex]u = 0[/tex]
acceleration of the ball due to gravity is given as
[tex]a = 9.8 m/s^2[/tex]
now the final speed of the ball is given as
[tex]v_f^2 - v_i^2 = 2 a d[/tex]
[tex]v_f^2 - 0 = 2(9.8)(15)[/tex]
[tex]v_f = 17.15 m/s[/tex]
What substances were found in the innermost regions (within about the inner 0.3 au) of the solar system before planets began to form?
A toy cannon uses a spring to project a 5.31 g soft rubber ball. the spring is originally compressed by 5.09 cm and has a force constant of 7.99 n/m. when the cannon is fired, the ball moves 15.2 cm through the horizontal barrel of the cannon, and there is a constant frictional force of 0.0325 n between the barrel and the ball. (a) with what speed does the projectile leave the barrel of the cannon
The speed of the projectile as it leaves the toy cannon can be calculated by using the principle of conservation of energy and solving a related equation. Initially, the ballistic energy is all potential, stored in the spring, and this energy transfers into kinetic energy of the ball and work done against friction as it moves through the barrel.
Explanation:The speed of the projectile as it leaves the barrel can be calculated using conservation of energy and basic kinematics. Initially, the energy is all potential in the compressed spring. This energy is transferred into kinetic energy and work done against friction as the ball moves through the barrel. The equation for energy conservation could be written like this:
Initial Energy (from spring) = Final Energy (kinetic) + Work done against friction
0.5*k*x² = 0.5*m*v² + F_friction*d,
where k is the spring constant, x is the initial compression of the spring, m is the mass of the ball, v is the speed of the ball, F_friction is the force due to friction, and d is the distance the ball travels in the barrel.
Filling in the provided values and solving for the speed v, should give you the speed the ball leaves the barrel with.
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A 2 kg bar of metal weighs about 4.4 pounds. Approximately how much does it weigh in newtons?
A) 1 N
B) 44 N
C) 2.2 N
D) 20 N
Answer:
Answer is D) 20 N
Explanation:
A 2 kg bar of metal weighs approximately 19.58 newtons. This gives us an approximate weight of 19.58 newtons, which is closest to option D) 20 N.
Explanation:To convert the weight of a metal bar from pounds to newtons, you can use the conversion factor: 1 pound is approximately equal to 4.44822 newtons.
To convert the weight of the metal bar from pounds to newtons, we can use the conversion factor 1 pound = 4.45 newtons. Therefore, to find the weight in newtons, multiply 4.4 pounds by 4.45 newtons/pound. This gives us an approximate weight of 19.58 newtons, which is closest to option D) 20 N.
To convert the weight of a metal bar from pounds to newtons, you would multiply the weight in pounds by the conversion factor of 4.44822, since 1 pound is approximately equal to 4.44822 newtons.
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what is true about pluto?
Pluto, a dwarf planet, has a unique orbit and composition, distinct from other planets in the solar system.
Pluto is considered a dwarf planet and is distinct from the gas giants in the solar system, being small, icy, and rocky. Its orbit is unique, shaped like a long ellipse and tilted compared to other planets. Initially thought to be a terrestrial planet, subsequent discoveries led to its reclassification as a dwarf planet.
When experimenting, you purposely change the temperature, temperature is the ___ variable?
Birds sitting on a single power line don't get shocked because there is no path for the current to flow to the __________.
Answer:
Ground.Explanation:
Basically, the reason why birds don't get electrically shocked, it's because they only reach a single path of the current. However, if they are able to toch something connected to the groun while they are on a cable, they will be shocked, becuase they are completeling the electrical cicle needed to flow the electricity.
Having said that, even a person can do that. Someone can grab a single power line without touching the ground or other cable, and that person will be fine, there can be thousands of volts and amperes, but that person will be totally fine.
Therefore, the word missing here is ground.
Birds sitting on a single power line don't get shocked because there is no path for the current to flow to the ground.
If a bowl of fruit is sitting on a table in a state of rest, what is the net force acting on it?
The net force is the vector sum of all forces acting on the object. The net force on the fruit boul resting on the table is zero.
Net force:
It is the vector sum of all forces acting on the object.When the magnitude of the two forces are equal but the direction is opposite, then the forces will cancel each other.When the net force of all forces acting on the object is equal to zero then the force is called balanced.A balanced force keeps an object at rest or in constant motion in a straight line.Therefore, the net force on the fruit boul resting on the table is zero.
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Which square (A, B, C, or D) represents the repeating subunit of the polymer shown?
The box (C) represents the repeating subunit of the polymer.
What are polymers?A polymer is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life.
Moreover, a polymer is a large molecule or a macromolecule which essentially is a combination of many subunits. The term polymer in Greek means 'many parts'. Polymers can be found all around us. From the strand of our DNA, which is a naturally occurring biopolymer, to polypropylene which is used throughout the world as plastic.
Hence, examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins.
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What is the mass of a shopping cart that is pushed with a net force of 10 N to accelerate at the rate of 0.5 m/s2?
Actualy the correct answer is going to be 20kg. And this how i got it. All i did was 10 divided by .5 and i got the answer.
Please mark brainiest please.
Force is the product of mass and acceleration. The force acting on the shopping cart is 10 N with an acceleration of 0.5 m/s². Then, mass of the cart is 20 Kg.
What is force?Force is an external agent acting on an object to change its state of rest or motion or to deform it. There are various kinds of forces, such as frictional force, magnetic force, gravitational force etc.
Newton's second law of motion states that, force of an objecting with a speed is the product of its mass and acceleration. Thus force increases with increase in mass or acceleration or with an increase in both together.
Given that, net force acting on the cart = 10 N
acceleration = 0.5 m/s².
Force = m a
mass m = F/a
= 10 N/ 0. 5 m/s²
= 20 Kg
Therefore, mass of the shopping cart is 20 Kg.
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TRUE OR FALSE!? HELP!!!!!
a) During deposition, particles of molecular nitrogen become farther apart.
b) When a piece of copper melts, its particles remain the same.
(Please, explain your answer!!!!)
Answer:
False
True
Explanation:
False: The reason is because theyare bonded by molecules
True: This is because a physical change does not change the chemical composition