Which phrase best describes a savanna biome?
You are standing in front of a flat large mirror. As you step 1.0 m farther from the mirror, the distance between you and your image changes by __________.
(Points : 1)
0 m
1.0 m
2.0 m
0.5 m,
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. exactly 5.0 s later, its speed is 6.0 m/s. what is the puck's average acceleration? what is the coefficient of kinetic friction between the puck and the ice?
a. The puck's average acceleration is equal to -1.2 [tex]m/s^2[/tex].
b. The coefficient of kinetic friction between the puck and the ice is 0.122.
Given the following data:
Initial speed = 12.0 m/sTime = 5.0 seconds.Final speed = 6.0 m/sa. To find the puck's average acceleration:
Mathematically, acceleration is given by the formula;
[tex]Acceleration = \frac{V_f\; - \;V_i}{t}[/tex]
Where:
V is the final velocity. U is the initial velocity. t is the time measured in seconds.[tex]Acceleration = \frac{6\; - \;12}{5}\\\\Acceleration = \frac{-6}{5}[/tex]
Average acceleration = -1.2 [tex]m/s^2[/tex]
b. To find the coefficient of kinetic friction between the puck and the ice:
The frictional force acting between the puck and the ice is given by the formula;
[tex]F = uN = -umg\\\\F = -umg\\\\\frac{F}{m} = -ug[/tex]....equation 1.
But, [tex]a = \frac{F}{m}[/tex] ....equation 2.
We know that acceleration due to gravity (g) of an object is equal to 9.8 meter per seconds square.
[tex]a = -ug\\\\u = \frac{-a}{g}\\\\u = \frac{-(-1.2)}{9.8} \\\\u = \frac{1.2}{9.8}[/tex]
Coefficient of kinetic friction, u = 0.122
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Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.54 cm, its potential energy is 0.0025 J.
(a) What is the force constant of the spring? (answer is in kN/M)
(b) What compression is required for the spring potential energy to equal 0.0078 J? (answer is in cm),
The force constant of the spring is roughly0.171 kN/ m. The contraction needed for the spring's implicit energy to equal0.0078 J is roughly0.381 cm.
To calculate the force constant of the spring( k), we use the formula for the implicit energy of a compressed or stretched spring, which is U = 1/2 k x2. Rearranging this formula to break for k gives k = 2U/ x2. Substituting U = 0.0025 J and x = 0.54 cm( or0.0054 m) into the formula yields k = ( 2 J)/(0.0054 m) 2. Calculating this, we find k = 171.296 N/ m or roughly0.171 kN/m.
For part( b), when seeking the contraction needed to produce a implicit energy of0.0078 J, we start from the formula U = 1/2 k x2 again. fitting the implicit energy U = 0.0078 J and the preliminarily calculated force constant k = 171.296 N/ m into the formula and working for x delivers x = sqrt(2 extasteriskcentered0.0078 J)/171.296 N/ m). This results in an x value of roughly0.00381 m or0.381 cm.
The region around the nucleus occupied by the electrons is called
Orbittal is referred to the region around the nucleus occupied by the electrons.
What is a Nucleus?This can be defined as a small, dense region consisting of protons and neutrons and is usually located at the center of an atom.
The electrons are present around the nucleus in a region which is referred to as orbittal and are actively involved in chemical reactions.
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Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s^2
"A circuit consists of a battery and two resistors connected in parallel. If the resistance in both resistors is doubled, and the current is kept constant, how does the voltage change?"
Why is the voltage doubled?,
Answer:
If the resistance in both resistors is doubled, then voltage gets doubled.
Explanation:
It is given that, A circuit consists of a battery and two resistors connected in parallel.
In parallel combination of resistors the potential difference remains the same while the current divides. The equivalent resistance is given by :
[tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}[/tex]
Initial condition, Let R₁ = R₂ = R
So, [tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R}+\dfrac{1}{R}[/tex]
[tex]{R_{eq}=\dfrac{R}{2}[/tex]
Using Ohm's law,
[tex]V=IR_{eq}=\dfrac{IR}{2}[/tex]...............(1)
Final condition, If the resistance in both resistors is doubled, and the current is kept constant.
So, [tex]\dfrac{1}{R'_{eq}}=\dfrac{1}{2R}+\dfrac{1}{2R}[/tex]
[tex]{R'_{eq}=R[/tex]
Voltage, [tex]V'=IR'_{eq}=IR[/tex]............(2)
From equation (1) and (2),
[tex]V'=2V[/tex]
So, the new voltage gets doubled. Hence, this is the required solution.
Which best describes how heat flows? A. Heat flows from a warmer object to a colder object. B. Heat flows in any direction. C. Heat flows from a colder object to a warmer object. D. All objects transfer to their heat to all other objects.
The statement which best describes how heat flows is that the heat generally flows from a warmer object to a colder object. Therefore, the correct option is A.
The mechanism of heat flow significantly describes the transfer of heat energy or enthalpy from one object to another. It is transferred through the process of conduction, convection, and radiation.
The object that is warmer in appearance may accumulate heat in enough amounts. This leads to an increase in its temperature and energy, While the mechanism of heat transfer generally initiates this warmer object to a colder object by conduction.
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Which was an idea used to promote the theory of plate tectonics
A. Mountain ranges linking in England and America
The theory of plate tectonics was promoted by the idea of continents drifting over time, which was proposed by Alfred Wegener. This concept was supported by evidence from fossils and rock formations, eventually leading to the development of the theory of plate tectonics.
Explanation:One idea used to promote the theory of plate tectonics is the concept of continents drifting over time. This idea was first proposed by Alfred Wegener in the early 20th century. He pointed out that the continents appeared to fit together like puzzle pieces, and he used evidence from fossils and rock formations to support his hypothesis of continental drift. Eventually, this idea led to the development of the theory of plate tectonics, which explains how the Earth's crust is divided into several plates that move and interact with each other.
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Jill pulls on a rope to lift a 12 kg pail out of a well, while the clumsy Jack watches. For a 10.0 meter segment of the lift, she lifts the bucket straight up at constant speed. How much power is required to complete this task in 5.0 seconds?
To lift a 12 kg pail at a constant speed over a distance of 10 meters in 5 seconds, Jill requires a power of 235.44 W. This is calculated using the weight of the pail, the distance lifted, and the time taken.
To determine how much power is required to lift a 12 kg pail straight up at a constant speed over a distance of 10 meters in 5 seconds, we can follow these steps:
1. Calculate the force needed: Since the pail is moving at a constant speed, the force needed to lift it is equal to its weight.
The weight (force due to gravity) is given by:
F = m imes g, where m = 12 kg and g = 9.81 m/s².So, F = 12 kg imes 9.81 m/s² = 117.72 N2. Calculate the work done: Work done in lifting the pail can be calculated as:
W = F imes d, where d = 10 m.So, W = 117.72 N imes 10 m = 1177.2 J3. Calculate the power required: Power is the rate at which work is done. It can be calculated as:
P = W / t, where t = 5 seconds.So, P = 1177.2 J / 5 s = 235.44 WTherefore, the power required to lift the pail at a constant speed over the specified distance in the given time is 235.44 W.
If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position?when released, what will be it’s kinetic energy if it flies past it’s starting position?
Answer:
Explanation:
A one volt change in potential means that the potential electrostatic energy changes by one Joule per Coulomb.
Since you would be pushing the charge against the field, and expend 10 J, the voltage would be 10 Volts higher.
That 10 J will be converted to kinetic energy if the charge flies back to the starting position without friction.
Final answer:
The voltage created when pushing 1 C of charge with 10 J of work is 10 V. Upon release, if no other forces act on the charge, it would have a kinetic energy of 10 J when it flies past its starting position.
Explanation:
When 10 J of work is done to push 1 C of charge against an electric field, the voltage (or electric potential difference) with respect to its starting position can be found using the formula V = W/Q, where V is the voltage, W is the work done, and Q is the charge. Therefore, V = 10 J / 1 C = 10 V.
According to the principle of conservation of energy, if no other forces act on the charge when it is released, all the potential energy will be converted into kinetic energy as it flies past its starting position. Therefore, the kinetic energy (KE) at that point will be equal to the work previously done on the charge, so KE = 10 J.
When air is heated enough so that it is warmer than the surrounding air, it is?
PLEASE HELP WILL MEDAL !!!
In the water cycle, which state of matter is water vapor?
solid
liquid
gas
plasma
during a neap tide, which phase could the moon be in? select all that apply
a. new
b. third quarter
c. first quarter
d. full
Answer:
b. third quarter
c. first quarter
Explanation:
Neap tides happen in the third and first quarter of the moon phase, when the moon appears to be half full, this is because of the position of the moon and the gravitational force of the moon attracting the tides along with the gravitational force of the sun, tha causes high tides on new, and full phases, but the third quarter and first quarter, the moon makes a 90º line with the solar gravitational forces, cancelling out both forces making it low tide or neap tide.
A hit-and-run incident is one of the more common cases for paint evidence.
true or false
Which description BEST explains the direction of the moving force of air?
how can you find the total displacement during the time interval of a graph?
please help totally lost :/
Answer:
Area under v-t graph = total displacement
Explanation:
The area under velocity time graph gives the total displacement of any object. Th attached figure shows a velocity time graph. In which the y axis shows the velocity and x axis shows the time taken.
The velocity is from 0 to 20 m/s and time is from 0 to 15 s. The total displacement is given by the area of region OABC.
So, d = 2 × area of triangle + area of rectangle
[tex]d=2\times \dfrac{1}{2}\times 5\times 20+5\times 20[/tex]
d = 200 m
The total displacement covered by an object in this case is 200 m. Hence, the total displacement during the time interval of a graph can be determined by v-t graph.
The cochlea _____. i) amplifies sound vibrations ii) collects sound pressure waves iii) detects the frequency of sounds
Answer:
The correct answer is option (i), amplifies sound vibrations
Explanation:
Cochlea is part of the inner ear that is responsible for receiving the sound vibrations. The received sound vibration is then converted into nerve impulses which are then send to the brain for interpretation. Cochlea amplifies the sound so that they can be easily detected even by a damaged ear and it is also able to stimulate the hearing nerve directly.
The cochlea amplifies sound vibrations.
What is Cochlea ?The cochlea is a spiral, hollow, conical chamber inside the human ears which is made up of a bone.
Cochlea is present inside the inner ear its function is to receive the sound vibrations.
The received sound vibration is then converted into nerve impulses which are then send to the brain for interpretation.
Cochlea amplifies the sound so that they can be easily detected even by a damaged ear and it is also able to stimulate the hearing nerve directly.
Hence The cochlea amplifies sound vibrations.
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Durante uma corrida de carros, o piloto da escuderia ganhadora percorreu a primeira volta da pista com velocidade media de 310 km/h. o que podemos dizer sobre as velocidades maxima e minima
3. The following can assist in positive communication?
A. having another person present.
B. making sure your point is made no matter what.
C. trying to find something to focus your attention on.,
HELP PLEASE .
Which of the following is an example of transuranium element ?
Samarium
Uranium
Thorium
Curium
Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
Samarium, uranium, and thorium are all elements with atomic numbers less than 92, which is the atomic number of uranium. Curium is the first transuranium element, with an atomic number of 96. It was discovered in 1944 by Glenn T. Seaborg and his colleagues at the University of California, Berkeley.
Curium is a radioactive element that decays into other elements, such as plutonium and barium. It has a variety of applications, including in nuclear weapons and medical research.
The other elements in the question are not transuranium elements. Samarium is an lanthanide element with an atomic number of 62. Uranium is an actinide element with an atomic number of 92. Thorium is an actinide element with an atomic number of 90.
Therefore, Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
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The difference in temperature between 100°C and 101°C is _____ the difference between 100K and 101K.
if you look inside the bowl of a shiny metal spoon, your image is upside down. if you look at the outside of the bowl, your image is right side up. explain.
The blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
The radio source ________ is located in a place consistent with the center of our galaxy.
Which formulas show the relationships between momentum, mass, and velocity? Check all that apply. p = mv p = p = m = p = v = v =
Answer: Option (a) is the correct answer.
Explanation:
Momentum is defined as the ability or tendency of an object to continue moving.
Also, momentum is the product of mass and velocity. It can be shown as follows.
p = m × v
where, p = momentum
m = mass
v = velocity
Thus, we can conclude that out of the given options, the formula p = mv show the relationship between momentum, mass, and velocity.
Answer:
A,D,F
Explanation:
Why do electromagnetic waves not require a medium for travel?
a.because electromagnetic waves travel too fast for stationary particles to move with them
b.because electromagnetic waves transmit energy without compressing the particles of the medium
c.because electromagnetic waves generate their own particles for compression and use these for movement
d.because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-d space?
A battery charger is connected to a dead battery and delivers a current of 3.5 a for 4 hours, keeping the voltage across the battery terminals at 16 v in the process. how much energy is delivered to the battery?
The energy delivered to the battery by the charger is calculated using the formula E = P times t, with P = I times V. It turns out to be 806,400 joules.
The question involves calculating the energy delivered to a battery by a battery charger. To find this, we use the formula Energy (E) = Power (P) times Time (t), where Power (P) is the product of the current (I) and the voltage (V). Here, the battery charger delivers a current of 3.5 A for 4 hours (time) and maintains a constant voltage of 16 V. Therefore, we calculate the energy as follows:
Energy (E) = Power (P) times Time (t)
Power (P) = Current (I) times Voltage (V) = 3.5 A times 16 V
Energy (E) = (3.5 A times 16 V) times 4 hours
Energy (E) = 56 W times 4 hours = 224 Wh
Since 1 Wh = 3600 J, Energy (E) = 224 times 3600 J
Energy (E) = 806,400 joules
So, the battery charger delivers 806,400 joules of energy to the battery.
What will happen to the brightness of a string of bulbs hooked up in series when you increase the number of bulbs in the string?
A. Each light in the string will get brighter.
B. Each light in the string will get dimmer.
C. There will be no change in the brightness of each light.
D. You cannot predict what will happen.,
What is the acceleration of a 24 kg mass pushed by a 6N force?