To find the cost of operating a 25-watt soldering iron for 8 hours at an energy cost of 8.0 cents per kWh, first convert the iron's wattage to kilowatts, then multiply by the hours to get kWh, and finally multiply by the cost per kWh. The total cost comes to 1.6 cents.
Explanation:To calculate the cost of operating a 25-watt soldering iron for 8.0 hours with electricity costing 8.0 cents per kilowatt-hour, we first need to convert the power usage into kilowatts and then multiply by the number of hours used to find the total energy consumed in kilowatt-hours (kWh). Finally, we multiply the energy consumed by the cost per kWh to find the total cost.
First, we convert watts to kilowatts:
25 watts = 0.025 kilowatts (kW).
Next, we multiply the power consumption by the number of hours used:
0.025 kW × 8.0 hours = 0.2 kWh.
Lastly, we calculate the total cost:
0.2 kWh × $0.08 per kWh = $0.016.
So, operating a 25-watt soldering iron for 8 hours would cost 1.6 cents.
please help me :)
A Ferris wheel at a carnival has a diameter of 62 feet. Suppose it turns at a rate of 70 revolutions per hour.
(a) Find the angular speed of the wheel in radians per hour.
(b) Find the linear speed of a passenger in feet per minute.
Do not round any intermediate computations, and round your answer to the nearest whole number.,
(a) Angular Speed is 140π radians per hour.
(b) The linear speed of a passenger on the Ferris wheel is approximately 3.249 feet per minute.
To find the angular speed of the Ferris wheel in radians per hour, you can use the following formula:
Angular Speed (ω) = (2π * Number of Revolutions) / Time
(a) Angular Speed in Radians per Hour:
Number of Revolutions = 70 revolutions
Time = 1 hour
ω = (2π * 70) / 1
ω = 140π radians per hour
Now, to find the linear speed of a passenger in feet per minute, you need to consider the circumference of the Ferris wheel.
(b) Circumference of the Ferris Wheel:
The diameter of the Ferris wheel is given as 62 feet, so the radius (r) is half of that, which is 31 feet. The circumference (C) of the wheel is given by:
C = 2πr
C = 2π * 31 feet
C ≈ 194.94 feet
Now, to find the linear speed (v) in feet per minute, you can use the formula:
Linear Speed (v) = (Circumference / Time)
Time in this case is 1 hour, which is equivalent to 60 minutes:
v = 194.94 feet / 60 minutes
v ≈ 3.249 feet per minute
Hence, the linear speed of a passenger on the Ferris wheel is approximately 3.249 feet per minute.
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This is an area of the Solar System located between the orbits of the Mars and Jupiter. It is occupied by numerous irregularly shaped rocky bodies.
The answer is 4 but idk how to get it so can somebody please explain how to get it
Cellular phones use _____?
A) radar waves
B) very high-frequency waves
C) very low-frequency waves
D) microwaves
3. D-Microwaves
1. C-electromagnetic spectrum
2. B-radio waves
^^(for those doing the three question physical science test)
Could someone help with these two answers please?
If the air inside a balloon exerts a force of 1.5 N on an area of 0.5 m², what is the pressure inside the balloon?
A. 0.5 N/m²
B. 1.5 N/m²
C. 2.5 N/m²
D. 3 N/m²
As your airplane takes off from an airstrip on the ground and rises 30,000 feet into
the sky, what happens to the air pressure on the outside of the airplane?
A. The air pressure decreases.
B. The air pressure increases.
C. The air pressure stays the same.
D. More information is needed.,
1. Show how the alternative definition of power, found in your book, can be derived by substituting the definitions of work and speed into the standard definition of power, P = W / delta t.
2. A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not.
Peter and Paul both had a great influence on the early church. True False
Answer:
The answer would be TRUE
Peter and Paul did have a great influence on the early church.
What is necessary for a substance to be a conductor of electricity?
If the strength of the magnetic field at A is 10 units, the strength of the magnetic field at B is
A)640 units
B)6.4 units
C)2.5 units
D)1.25 units
Which are true statements?
Check all that apply.
A. 1 mol is 6.02 × 1023 of something.
B. 6.02 × 1023 g is the weight of 1 mol.
C. The mass of 1 mol is the same as the atomic mass in grams.
D. A mole is the atomic mass.
Work output of a large machine in a factory is 89,000 joules, and it’s input is 102,000 joules. Work output of a similar machine is 92,000 joules, and it’s work input is 104,000 joules. Which machine has a greater efficiency
Answer:
The machine with work input of 104,000Joules and work output of 92,000 has the greater efficiency
Explanation:
Efficiency of a machine is the ratio of work done by a machine(work output) to work put in the machine (work input).
Mathematically,
Efficiency = Work output/Work Input ×100
For the machine with work output of 89,000Joules and work input of 102,000Joules, its efficiency will be;
Efficiency = 89,000/102,000×100
Efficiency = 87.5%
Similarly for the other machine with work output of 92,000Joules and work input of 104,000Joules, its efficiency will be;
Efficiency = 92,000/104,000×100
Efficiency = 88.5%
Comparing the efficiency of both machines, the machine with efficiency of 88.5% has greater efficiency.
Which of the following represents the greatest energy transition from a higher energy level to a lower one?
emission of a blue photon of 450 nm
emission of a red photon of 770 nm
emission of a green photon of 550 nm
emission of a yellow photon of 590 nm
Final answer:
The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm.
Explanation:
The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm. This is because the energy of a photon is inversely proportional to its wavelength. As the wavelength decreases, the energy increases. Since blue light has a shorter wavelength than red, green, and yellow light, it has the highest energy.
is the following chemical equation balanced? 2Na + 2H 2 O 2NaOH + H 2
Yes it is.
There are 2 Na atoms on each side,
there are 4 H atoms on each side (2H and H₂),
there are 2 O atoms on each side.
This means that the equation is even (not accounting for energy loss or anything like that).
What is the average power output of a weight lifter who can lift 260 kg from the floor to a height of 1.60 m in 1.7 seconds?
Which is not a protection against electrical accidents?
a. fuse
b. conducting wire
c. insulation
d. grounded plug
If red and yellow paint are mixed together, which color of light will be reflected?
A. Orange
B. Red
C. White
D. Black
James rode his bike 0.65 hours and traveled 8.45 km. What was his speed?
Final answer:
James's average speed was calculated by dividing the distance he traveled, 8.45 km, by the time it took, 0.65 hours, resulting in an average speed of 13 km/h.
Explanation:
To find James's speed, you need to divide the total distance he traveled by the total time it took him. In this case, the distance traveled is 8.45 km and the time is 0.65 hours. Use the formula speed = distance/time to calculate the speed.
The calculation would be:
Convert time to the same unit as speed (hours to minutes or kilometers per hour). Here, the time is already in hours.Divide the distance by the time: 8.45 km ÷ 0.65 hours = 13 km/h.So, James's average speed while riding his bike was 13 kilometers per hour (km/h).
The typical speed is the all out distance went by the item in a specific time stretch. The typical speed is a scalar amount. It is addressed by the greatness and doesn't have heading.
An electric generator transforms mechanical energy into electrical energy. This process could be done by which of these?
A) Using wind to spin a magnet around.
B) Connecting a battery to a coil of wire.
C) Turning a wheel that contains electrons.
D) Spinning a coil of wire near a large magnet.
Answer:
D) Spinning a coil of wire near a large magnet.
Explanation:
From Faraday's law of induction, when a conducting coil of wire is placed in changing magnetic flux, an emf is induced which produces current in the coil.
Induced emf is given by:
[tex]e = -\frac{d\phi}{dt}[/tex]
A generator is based on the same principle.
The mechanical energy of rotating coil is converted to electrical energy when current is induced. Thus, the correct option is D) Spinning a coil of wire near a large magnet.
An electric generator converts mechanical energy into electrical energy via electromagnetic induction, which is achieved by spinning a coil of a wire near a large magnet. This process is described accurately in option D of the multiple choice question.
Explanation:An electric generator operates on the principle of electromagnetic induction, which was discovered by Michael Faraday. It involves the conversion of mechanical energy into electrical energy by spinning a magnet within a coil or spinning a coil within a magnetic field. Therefore, the correct answer to which process transforms mechanical energy into electrical energy in an electric generator is D) Spinning a coil of wire near a large magnet.
This process generates an electromotive force (emf) that results in the flow of electric current. The other options mentioned, such as using wind to spin a magnet around (A), connecting a battery to a coil of wire (B), or turning a wheel that contains electrons (C), do not accurately describe the fundamental operation of an electric generator.
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as an object falls freely toward earth, the object's momentum is
1. decreses
2. inceases
3. remains the same,
The object's momentum remains the same as it descends freely toward the earth.
So, option 3. is correct.
Define momentum.Momentum is a measurable quantity that exists because an object is moving and has mass. The mass multiplied by the velocity equals momentum. If an item is stationary, its velocity is zero, and it has no momentum.
When an object descends toward Earth, it accelerates due to gravity, accumulating speed and momentum until the upward force of air resistance equals the downward force due to the object's weight under gravity, a point known as terminal velocity.
The law of conservation of momentum asserts that the overall momentum of objects that interact does not change in the absence of external forces such as friction.
So,
The object's momentum 3. remains the same as it descends freely toward the earth.
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Whats number 4 ?????????
What is ozone? How and where is it formed in the atmosphere?
A 10.0 cm object is 5.0 cm from a concave mirror that has a focal length of 12 cm. What is the distance between the image and the mirror?
True or false, The golf club is swung in a northernly direction, and that is the direction the ball travels
Final answer:
The statement is false since merely swinging the golf club in a northern direction does not ensure that the ball will travel in that direction due to external influences like wind and gravity, much like an airplane can be blown off course.
Explanation:
The statement "The golf club is swung in a northernly direction, and that is the direction the ball travels" is false. In physics, particularly when discussing vectors and motions, the direction that an object is initially moved by a force (like a golf club hitting a ball) does not necessarily dictate that the object will continue to move in that initial direction. Various other forces and factors can influence the trajectory. For example, merely swinging the club in a northern direction does not account for factors such as wind, slope of the ground, spin of the ball, and gravity, all of which can alter the path of the golf ball.
Consider the analogy provided using an airplane's motion. An airplane heading north can be moved off that northward path by the wind, causing it to drift westward. Similarly, swinging the golf club in one direction does not guarantee the ball will follow that path precisely. Additionally, according to physics, when a magnet breaks, all pieces will indeed still have north and south poles, indicating that the physical direction is not the only factor determining the outcome—in both magnetism and ball trajectory.
As part of the photoelectric effect, which of these is responsible for the pixels in an image on a digital camera?
A. accumulated electrons that are absorbed by the image sensor.
B. accumulated electrons that are ejected by the image sensor.
C. accumulated photons that are ejected by the image sensor.
D. accumulated photons that are absorbed by the image sensor.,
Answer:
It's B) accumulated electrons that are ejected by the image sensor
On edge 2020
Explanation:
An object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s. find the (a) speed and (b) mass of the object.
Answer: The correct answers are 482.4 m/s and 21.96 kg.
Explanation:
The expression for the kinetic energy in terms of momentum of an object is as follows;
[tex]KE=\frac{p^{2} }{2m}[/tex]
Here, KE is the kinetic energy, p is the momentum and m is the mass of the object.
It is given in the problem that an object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s.
Calculate the mass of the object.
[tex]KE=\frac{p^{2} }{2m}[/tex]
Put p=25.0 kg · m/s and KE= 275 J.
[tex]m=\frac{25^{2} }{2(275)}[/tex]
[tex]m=1.14 kg[/tex]
Calculate the speed of the object.
[tex]KE=\frac{1}{2} mv^{2}[/tex]
Put m= 1.14 kg and KE= 275 J.
[tex]v=\sqrt{\frac{2(275)}{1.14} }[/tex]
v=21.96 m/s
Therefore, the speed of the object is 21.96 m/s and the mass of the object is 1.14 kg.
In which labeled portion of the curve would you use the heat of vaporization to calculate the heat absorbed? (image attached inside!)
1, 2, 3, 4, or 5
**not sure :( Thank you!!
Write the value 299,792,458 m/s in proper scientific notation to 4 significant figures. 2.998 × 108 m/s 2.997 × 108 m/s 2.998 × 106 m/s 2.997 × 106 m/s
20 points BRAINLIEST!!! ASAP ANSWER
Choose one piece of evidence. Explain, in your own words, how it supports the Big Bang Theory.
A. Redshift
B. CMB
C. Hydrogen and Helium
D. Less Evolved Distant Galaxies
The three classes of rocks are sedimentary, metamorphic, and igneous. How are rocks classified into one of these three groups? A. According to the type of minerals present in the rock B. According to how many times they have been through the rock cycle C. According to the method of their formation D. According to the amount of weathering they have endured Rese
the answer is C. according to the method of their information
Which of the following are metalloid elements?
Check all that apply.
A. Boron (B)
B. Phosphorus (P)
C. Silicon (Si)
D. Tin (Sn)
E. Lead (Pb)