The efficiency of a machine increases as the temperature inside increases relative to the temperature outside.
Answer:
The correct answer is increases.
Explanation:
According to the second principle of thermodynamics, when two objects at different temperatures come into thermal contact with each other, thermal energy always flows from the hottest object to the coldest.
Therefore we deduce that if the inside temperature of the machine is higher than the outside temperature, the machine will have a higher efficiency.
Have a nice day!
As the current in a coil of wire increased, the magnetic field strength what?
Answer:
A coil of wire with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil greatly increases the strength of the electromagnet. Changing magnetic fields induce electric currents in copper and other conductors.
Which is the magnitude of the vector 13 m/s to the east
I don’t know undertansdsje
Answer:
The correct answer is 13 m/s.
Two balloons are charged with an identical quantity and type of charge:-4 nC. They are held apart at a separation distance of 70 cm. Determine the magnitude of the electrical force of repulsion between them.
Final answer:
To find the repulsive force between two charged balloons, we employ Coulomb's Law, applying given values into the formula to calculate the force based on the charges' magnitudes and separation distance.
Explanation:
The question involves calculating the magnitude of the electrical force of repulsion between two balloons charged with an identical quantity and type of charge (-4 nC), and separated by a distance of 70 cm. To find this, we use Coulomb's Law, which states that the force between two charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them
The formula for Coulomb's Law is given by F = k × (q1 × q2) / r², where F is the force between the charges, k is Coulomb's constant (8.987 ×510¹ N m² C²), q1 and q2 are the magnitudes of the charges, and r is the distance between the charges. Inserting the given values (-4 nC for each charge and 0.7 meters for r):
F = (8.987 × 10¹) × ((-4 × 10⁻⁹) × (-4 × 10⁻⁹)) / (0.7)²
Calculation results in the repulsive force magnitude, which is what the question is seeking. It's important to remember that since the charges are identical in magnitude and type, the force calculated will be repulsive.
Which three statements about electromagnetic radiation are true?
-- Light is electromagnetic radiation.
-- Electromagnetic radiation has no mass.
-- Electromagnetic radiation can travel through vacuum.
Answer:
Option (1), (3) and (4) are correct.
Explanation:
When the oscillating electri and magnetic field interacts perpendicularly to each other, the electromagnetic radiations are produced. The electromagnetic radiations propagates in the perpendicular direction of both electric and magnetic field vectors.
For example, gamma rays, X rays, ultra violet rays, visible radiations, infrared rays, micro waves and radio waves.
Electromagnetic radiations do not require any medium for their propagation.
They do not carry mass, they carry energy only.
an axe used to split wood is driven into a piece of wood a distance of 3.0 cm. If mechanical advantage of the axe is 0.85. how far apart is the wood split?
3.53 cm
Explanation;Mechanical advantage = Input distance/output distance
Input distance = 3.0 cm
Mechanical advantage = 0.85
Output distance = Input distance/Mechanical advantage
= 3.0/0.85
= 3.53 cm
explain the relationship between pitch and frequency.
The pitch of a sound you hear depends on the frequency of the sound wave. A high frequency sound wave has a high pitch, and a low frequency sound wave has a low pitch.
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
The diagram shows how an image is produced by a plane mirror.
Which letter shows where the image will be produced?
W
X
Y
Z
I had this question on a quiz, it was X.
Answer:
X
Explanation:
A plane mirror produces a virtual and erect image. The distance of the image from the mirror is same as distance of object from the mirror. The image formed is of the same size as of the object. The image is produced behind the mirror.
In the given diagram, the image of the ball would form behind the mirror at position X which is at equal distance from mirror as the ball is.
50 POINTS! A Boy throws a ball horizontally a distance of 22m downrange from the top of a tower that is 20.0m tall. What is his throwing velocity?
The ball's horizontal and vertical velocities at time [tex]t[/tex] are
[tex]v_x=v_{xi}[/tex]
[tex]v_y=v_{yi}-gt[/tex]
but the ball is thrown horizontally, so [tex]v_{yi}=0[/tex]. Its horizontal and vertical positions at time [tex]t[/tex] are
[tex]x=v_{xi}t[/tex]
[tex]y=20.0\,\mathrm m-\dfrac g2t^2[/tex]
The ball travels 22 m horizontally from where it was thrown, so
[tex]22\,\mathrm m=v_{xi}t[/tex]
from which we find the time it takes for the ball to land on the ground is
[tex]t=\dfrac{22\,\rm m}{v_{xi}}[/tex]
When it lands, [tex]y=0[/tex] and
[tex]0=20.0\,\mathrm m-\dfrac{9.8\frac{\rm m}{\mathrm s^2}}2\left(\dfrac{22\,\rm m}{v_{xi}}\right)^2[/tex]
[tex]\implies v_i=v_{xi}=11\dfrac{\rm m}{\rm s}[/tex]
Answer: 11m/s.
Explanation: 11m/s.
3. To calculate the _____ of a moving object, divide the displacement by the time interval in which the displacement occurred.
average velocity
instantaneous velocity
initial velocity
negative velocity
Average velocity
Explanation;Average Velocity of a moving body or an object is the ratio of total displacement covered to the time interval during which the displacement occurred. That is; Change in displacement divided by time.The formula, therefore will be;Average velocity = Displacement/ the time interval
Instantaneous Velocity on the other hand is the velocity of an object or a body at some instance.Answer:
Average velocity
Explanation:
Hi, the average velocity of an object is equal to the total displacement of an object divided by the total time spent.
Average velocity = Distance /time
The units used are distance units per time units (for example: meters per second).
Is the rate of the change of position of an object.
Feel free to ask for more if needed or if you did not understand something.
Each color has its own frequency and wave length? True or false
Each color does have it's own frequency an wave length.
the strong nuclear force is
about the same as the electric force
75 times smaller than electric force
more than 100 times greater than the electric force
Answer is option C.100 times greater than electric force.
in the nucleus ,protons are close to each other ,because of the strength of strong nuclear force.
when you mix sugar into water in a beaker the sugar is no longer visible. what happens in the beaker
the sugar dissolves, but is still there, just not visible
Ignore friction and air resistance. If the total mass of the roller coaster cars is 800kg, and the 50,000 N of gravitation force are acting on the roller coaster cars, what is the acceleration of the roller cars?
Force = (mass) x (acceleration) ===> Newton #2
Divide each side by (mass), and then it says:
Acceleration = (force) / (mass)
Acceleration = (50,000 N) / (800 kg)
Acceleration (of gravity) = 62.5 m/s²
.
Now, the only question I have is: WHERE is this coaster ?
The gravity there is almost 6.4 times Earth's gravity.
It's 2.5 times Jupiter's gravity, and 23% of the gravity ON THE SUN !
If you weigh 125 pounds on Earth, you would weigh 7,813 pounds in THAT place. You surely couldn't climb into the coaster or sit in a seat, and the coaster surely could not carry you.
The diameter of the moon is a little less than the distance across the United States. Please select the best answer from the choices provided T F
Answer:
true
Explanation:
The diameter of the Moon is 3474 km. The distance across the United States, from Florida to Washington, is 4509.382 km.
It is true that the diameter of the moon is a little less than the distance across the United States.
Answer: Option A
Explanation:
Moon is the natural satellite of our Earth. It revolves around the Earth due to the gravitational force acting on the moon. The moon also has its own gravitational force. The gravitational force of moon is [tex]\frac{1}{6} t h[/tex] of the gravitational force on Earth.
The mass of moon is [tex]7.34 \times 10^{22}[/tex] kg while the mass of the Earth is [tex]5.972 \times 10^{24}[/tex] kg. So the moon’s mass is very very less than that of Earth. So the diameter of moon is found as 3,472 km while the diameter of Earth is 12,742 km.
Thus the dimension of moon is [tex]\frac{1}{4} t h[/tex] of the dimension of the Earth. Even the diameter of moon is little less than the distance across the United States as the distance across United States is 4509 km.
50 POINTS! A Dancer leaps across the stage in a beautiful grand jete. The ballerina leaps at an angle of 25° and is able to jump a horizontal distance of 1.5m. What is her initial x and initial y velocity? (hint: find Vi first, then Vxi and Vyi)
The horizontal range formula tells us
[tex]x=\dfrac{{v_i}^2\sin2\theta}g[/tex]
where [tex]v_i[/tex] is the dancer's initial speed, [tex]\theta[/tex] is her launch angle, and [tex]g[/tex] is the acceleration due to gravity. So
[tex]1.5\,\mathrm m=\dfrac{{v_i}^2\sin50^\circ}{9.8\frac{\rm m}{\mathrm s^2}}\implies v_i=4.4\dfrac{\rm m}{\rm s}[/tex]
Her initial velocity as a vector is
[tex]\vec v_i=v_{xi}\,\vec\imath+v_{yi}\,\vec\jmath[/tex]
where
[tex]v_{xi}=v_i\cos25^\circ=4.0\dfrac{\rm m}{\rm s}[/tex]
[tex]v_{yi}=v_i\sin25^\circ=1.9\dfrac{\rm m}{\rm s}[/tex]
Answer: 1.9m/s.
Explanation: 1.9m/s.
what is the input force needed to push a 1580 newton snowmobile up a 2.5 long board into the back of a pick-up truck. the bed of the pickup is 1.10 meters high and the board is 80% efficient?
869 Newtons.
ExplanationWhat's the gain in Gravitational Potential Energy in this process?
[tex]\displaystyle \Delta \text{PE} = \underbrace{(m\cdot g)}_{1580\;\text N}} \cdot \Delta h = 1580\times 1.10\;\text{m} = 1738\;\text{J}[/tex].
What's the energy input in this process?
The output of the board is the same as the gain in gravitational potential energy, 1738 Joules.
[tex]\displaystyle W_\text{in} = \frac{W_\text{out}}{\text{Efficiency}} = \frac{1738}{0.8} = 2172.5\;\text{J}[/tex].
[tex]F = \dfrac{W_\text{in}}{d}= \dfrac{2172.5}{2.5} = 869\;\text{N}[/tex].
Explain why the phrase "by ordinary means" was added to the Law of Conservation of Energy
-it can only be converted from one form to another.
The phrase "by ordinary means" was added to the Law of Conservation of Energy because kind to be expected in the normal order of events.
What is mean by Law of Conservation of Energy and who proposed it?Law of Conservation of Energy law, first proposed and tested by Émilie du Châtelet, means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodesThe conservation of energy formula goes Ki+Ui=Kf+Uf. U is potential energy and K is kinetic energy..The laws of conservation of energy, momentum, and angular momentum are all derived from classical mechanics.The phrase "by ordinary means" was added The phrase "by ordinary means" was added.
To learn more about laws of conservation of energy refer:https://brainly.com/question/11911812
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Why does life be life
Because you don't have your banana milk, broski
...
Life... is a dream.
...
Life... is a story.
...
Life... is a creation of human kind.
...
Life............................ is 42.
is this app good and answer comes instantly!!
Of course yes =D
It is a useful app for students and for teachers =D
Best regards
Hi! ⭐️
This app sure does help, maybe their will be kids sometimes that joke around but then overall they answer correctly!
Hope this helped!
Have a wonderful day! ♥️
A horse performs 2600 joules of work pulling a wagon for 13 seconds. What is the horse's power? 33800 W 200 W 0.005 W 2600 WA horse performs 2600 joules of work pulling a wagon for 13 seconds. What is the horse's power?
33800 W
200 W
0.005 W
2600 W
Answer:
200 W
Explanation:
The power is given by the ratio between the amount of work done and the time taken to perform the work:
[tex]P=\frac{W}{t}[/tex]
where in this problem we have
W = 2600 J is the work done
t = 13 s is the time taken to do the work
Substituting the numbers into the equation, we find
[tex]P=\frac{2600 J}{13 s}=200 W[/tex]
Answer:
200 W
Explanation:
To figure out the power, you need to use the formula: P = work/time. You need to remember that they may ask you for the significant figures, so that is how many digits you have to round by. This question does not specify significant figures.
2600/ 13 = 200
Your answer is 200 watts
Which has a greater momentum? A 1200kg car traveling at 30m/s or a 2000kg truck traveling at 20m/s
Momentum is found by multiplying the mass of the object by the velocity.
1200 x 30 = 36,000 Newtons
2000 x 20 = 40,000 Newtons.
The 2,000kg truck has greater momentum.
A neutron of mass 1.7x10^-27 kg travels a distance of 12m in a time interval of 3.6x10^-4 sec assuming speed constant it's Kinetic energy is??
The kinetic energy of the neutron is calculated by using the formula for kinetic energy, KE = 1/2mv^2 with mass 1.7x10^-27 kg and speed 3.33x10^4 m/s. The resulting kinetic energy is 1.88x10^-19 Joules.
To calculate the kinetic energy of a neutron we can use the formula for kinetic energy: KE = 1/2mv^2 where 'm' is mass and 'v' is velocity. We first need to calculate the velocity of the neutron, which we can get by dividing distance (12m) by time (3.6x10^-4 sec). The resulting speed is 3.33x10^4 m/s.Explanation:
Next we use the given mass of the neutron 1.7x10^-27 kg, the speed we've calculated, and the kinetic energy equation. After substitution into the formula we get: KE = 1/2 * (1.7x10^-27 kg) * (3.33 x 10^4 m/s)^2 yielding KE = 1.88x10^-19 Joules.
Learn more about Kinetic Energy here:https://brainly.com/question/26472013
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A four-resistor circuit that has three parallel resistors is considered to be what type of circuit?
A. series
B. parallel
C. complex
D. conventional
i think it is C. Complex, although i haven't learned this so long.
A four-resistor circuit that has three parallel resistors is considered to be a type of circuit in parallel. The correct option is B.
When resistors are connected in parallel, they have the same voltage across them but different currents flowing through them.
four cars are required to take a group of 16 students on a trip.If there are 36 students to transport how many cars would be needed?
4 cars = 16 students
? cars = 36 students
let x be the number of cars for 36 students
4 • 36 = 16 • x
144 = 16x
144/16 = x
9 = x
It requires 9 cars for 36 students.
//Hope it helps
To transport 36 students, when 4 cars are required for 16 students, we use a proportion to calculate that nine cars are needed.
Explanation:To determine the number of cars needed to transport 36 students, we can set up a proportion based on the information that four cars are required for 16 students. This is a straightforward arithmetic problem involving ratios. We use the following proportion:
16 students / 4 cars = 36 students / x cars
Solving for x gives us the equation:
16/4 = 36/x
After cross-multiplying, we have:
16x = 36 * 4
16x = 144
To find x, divide both sides by 16:
x = 144 / 16
x = 9
Therefore, nine cars are needed to transport 36 students.
Learn more about Proportion here:https://brainly.com/question/34018947
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The diagram shows a spherical wave.
Which letter represents a wavelet?
A. W
B. X
C. Y
D. Z
the answer to this question is y
Answer:
Y
Explanation:
According to Huygen's principle, each point on a wavefront is a source of wavelets which generates the next wavefront.
In the given diagram, point source of light that is the primary source is represented by W. X and Z are wavefronts. The points marked on X are point source of wavelets. On Z, a wavelet is represented by Y. The wavelets spread out in forward direction. The envelope of wavelets forms a wavefront.
John's grandfather clock has a pendulum that keeps the seconds. What does this graph say about the observed pattern of motion?
A) The pendulum swings with a constant velocity.
B) The vacillating periodic motion changes sign.
C) The pendulum displays a constant acceleration.
D) The oscilations show a variable rate of motion.
Option A: The pendulum swings with a constant velocity.
The pendulum is swinging back to center at position 2 m and time 8 sec.
what does the acronym Dash stand for
DASH is an acronym for Dietary Approaches to Stop Hypertension.
It stands for Dietary Approaches to Stop Hypertension. Hope I was able to help you. :)
What provides the source of the earth’s magnetic field?
the north and south poles of the earth.
the sun.
the ocean’s electric currents.
the core of the earth.
The explanation accepted by science until now, indicates that Earth's magnetic field is generated in the deepest of the terrestrial nucleus.
This is due to the movements of liquid metals in the core of the planet.
To explain it in more detail:
Right in the center of the Earth there is an internal core of solid iron at a very high temperature, this iron is as hot as the surface of the Sun, however, the pressure caused by the gravity force prevents it from becoming liquid. Around this inner core is the outer core, a layer of approximately 2000 km thick, composed of iron, nickel and small amounts of other metals in liquid state. Due to the lower pressure of the outer core, in relation to the inner core, the metal here is fluid (molten).
The differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal, as the cold, dense matter sinks, and the warm, less dense matter rises. In addition, the Coriolis force, resulting from the spin of the Earth, also causes eddies in this mixture of molten metals.
This is how the movement of liquid iron inside the Earth generates electric currents, which in turn produce magnetic fields, and the spiral caused by the Coriolis force causes the magnetic fields to align in approximately the same direction, being this combined effect added to produce a vast magnetic field that envelops the entire planet.
This field extends from the terrestrial nucleus, progressively attenuating itself in outer space. However, it should be noted that unlike the field of a bar magnet, the Earth's magnetic field changes over time because it is actually generated by the movement of the iron alloys in the Earth's outer core, which causes the poles to move.
Answer: D
Explanation: the guy above gave a good explanation and is right
what does a resistor do in a circuit?
lowers the amount of voltage going through a circuit
If there is but one resistor in the circuit, it will limit the current flow according to E = I*R
If there are two resistors in series in the circuit, they will affect a voltage divider.
Though you haven't asked for it, the voltage drop across the 3 ohm resistor is E = I*R
I = 5 amps
R = 3 ohms
E = 5 * 3 = 15 Volts
And through the 2 ohm resistor, you get
I = 5 amps
R = 2 ohms
E = 2*5
E = 10 volts.
So the total is 10 v + 15 v = 25 volts
Each resistor then has a reading in voltage across it. That is called a voltage divider.
===========
One "resistor" like a light bulb is made to give light and also to limit the current.
The specific heat capacity of a substance is the amount of energy associated with doing which of the following to 1kg of the substance?
Answer:
Raising its temperature by [tex]1^{\circ}C[/tex]
Explanation:
The specific heat capacity of a substance is defined as the amount of energy needed to raise the temperature of 1 kg of a substance by [tex]1^{\circ}C[/tex].
The specific heat capacity of a substance essentially tells us how much energy is needed to heat the substance: the larger it is, the more energy is needed. The amount of energy needed to increase the temperature of a substance is given by
[tex]Q=mC_s \DeltaT[/tex]
where
m is the mass of the substance
Cs is the specific heat capacity
[tex]\Delta T[/tex] is the temperature variation of the substance
Answer:
Raising its temperature by 1 C
Explanation:
A P E X