Answer:
1 kw-hr = 1000 w * 3600 sec = 3.6E6 Joules
E = P t = 120 J/C * 8 C/sec * 3600 sec /hr * 15 hr = 5.18E7Joules
where E is energy used by microwave
5.18E7 / 3.6E6 * .11 = $1.58 cost to run for 15 hrs
A certain resistance thermometer reads 14. 5 Ω in pure melting ice and 18. 5 Ω in steam at standard atmospheric pressure. What will be its resistance at room temperature of 27. 0 o C ?
The resistance of the thermometer at the given temperature is 15.58 ohms.
Resistance of the thermometer
The resistance of the thermometer can be determined by applying method of interpolation as shown below;
[tex]\frac{R_\theta - R_0}{R_{100} - R_0} = \frac{\theta -0}{100 - 0}[/tex]
where;
Rθ is the resistance of the thermometer at 27⁰CR100 is the resistance at steam temperatureR0 is the ice temperature[tex]\\\\\frac{R_\theta - 14.5}{18.5 - 14.5} = \frac{27}{100} \\\\\frac{R_\theta - 14.5}{4} = \frac{27}{100}\\\\100R_\theta - 1450 = 108\\\\100R_\theta = 1558\\\\R_\theta = 15.58 \ ohms[/tex]
Thus, the resistance of the thermometer at the given temperature is 15.58 ohms.
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A block of weight 5000 N is pushed up a slope by a force of 250 N. Assume there is no friction. Calculate:
a) the actual mechanical advantage
b) the velocity ratio
c) the length of the slope if the height of the slope is 10 m
The actual mechanical advantage, the velocity ratio, and the length of the slope if the height of the slope is mathematically given as
A=20VR=0.05x=20mWhat are the actual mechanical advantage, the velocity ratio, and the length of the slope if the height of the slope is 10 m?Question Parameters:
A block of weight 5000 N is pushed up a slope by a force of 250 N.
Generally, the equation for the actual mechanical advantage is mathematically given as
A=Fout/Fin
A=5000/250
A=20
b)
the velocity ratio is given by the distance moved by the effort divided by the distance moved by the load
Therefore
VR=250/5000
VR=0.05
c)
the length of the slope if the height of the slope is 10 m
Assume the slope is at an angle of 30
Hence
sin 30=10/x
x=20m
Read more about Motion
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Answer:
A) as you know AMA is equal to VR so the solution is 5000N/250N which is equal to 0.05with no units
PLEASE HELP ASAP!! I SWEAR I'LL GIVE YOU BRAINLIEST!! (PICTURE IN QUESTION!!)
A. 55 kg
B. 72 kg
C. 48 kg
D. 61 kg
How much work is done by a a 500watt blender that takes 180 seconds to crush ice
Answer:
Work done = 9 x 10⁴ J
Explanation:
Given :-
Power = 500 Watts
Time Taken = 180 seconds
To Find :-
Work Done
Formula to be used :-
Power = Work Done / Time Taken
Work Done = Power x Time Taken
Inputting the values :-
= 500 W x 180 seconds
= 90,000 J
= 9 x 10⁴ J
What happens to particle movement/speed when energy is added to a phase?
what’s an example of Newton’s 3rd law of motion?
Answer:for ever reaction there is an equal and opposite reaction
Explanation:
Answer:
, when you jump high, your legs apply a force to the ground.
Explanation:
Using the velocity versus time graph, what was the average acceleration of the object during segment B?
a) 0 m/s/s
b)20 ms/s
c) 10 m/s/s
d) 5 m/s/s
Answer:
the answer is B 20 ms/s
Explanation:
N/A
Thus the for the given velocity versus time graph the average acceleration of the object during segment B is 0 m/s/s.Hence, option A is the correct option.
Average acceleration- Acceleration is defined as the rate of change of acceleration. Average acceleration for an interval can be defined as the rate of change of velocity for that interval per time.
Let [tex]\Delta v[/tex] be the change in velocity and [tex]\Delta t[/tex] be the change in time in a given time interval. Then average acceleration is,
[tex]a= \dfrac{\Delta v}{\Delta t}[/tex]
At segment B, It starts at 4.5 seconds and ends at 10 seconds. The total time interval for this segment is 5.5 seconds.Therefore,
[tex]\Delta t=5.5[/tex]
Now the change in velocity for segment B. In segment B the velocity does not change at any point and keeps the value of 20 m/sec at the time interval.
According to the definition of the average acceleration when an object is changing its velocity (whether by a constant amount or a varying amount) then it is an accelerating object. And an object with a constant velocity is not accelerating.
Thus the for the given velocity versus time graph the average acceleration of the object during segment B is 0 m/s/s.Hence, option A is the correct option.
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How many Protons does Na (sodium) have
O 23
O 12
O 13
O 11
How does the star’s apparent brightness change over time?
The closer light source will appear brighter. In other words the closer the stars are the brighter they will be. Also The darker the sky is the more you will see the stars.
When you have been swimming swimming and you come out of the pool, you may feel cold. Use your understanding of endothermic processes to explain why.
Explanation:
Edothermic process is the absorbtion of heat.
It is the opposite of exothermic process which is the release of energy. In edothermic process thermal energy is absorbed from the surrounding
A telescope is used to take two images, one magnified 100x and the other magnified 400x. In which image would you be able to see the most detail and why?.
We can see the image in most detail that having 400x magnification as compared to 100x.
What is magnification?Magnification is the process in which the size of an object is enlarging but not physical size of something. Those instruments having high magnification power can shows us the image larger and due to which we can see that image clearly.
So we can conclude that we can see the image in most detail that having 400x magnification.
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One of the most important tasks of the small intestine is
the:
a. absorption of nutrients
b. collection of water
C. excretion of urine
d. repair of blood cells
what do you mean by electric wind?
Explanation:
The electric field is normal to any conductor charged surface, then any negatively charged sharp end will concentrate the electrons in order to achieve that (being rejected by the others on main body), that also implies a huge voltage drop nearby the edge, meaning high electric field in the direction aimed by the sharp end, that field becomes strong enough (when charged by electrostatic machines) to propel electrons out causing air movement in that direction (a flame will bend because of that wind).
Ion wind, ionic wind, coronal wind or electric wind is the airflow induced by electrostatic forces linked to corona discharge arising at the tips of some sharp conductors (such as points or blades) subjected to high voltage relative to ground. Ion wind is an electrohydrodynamic phenomenon
Hi, by the ways happy Halloween , I hope this really helps
Rebecca and John take their daughter to Disney World. When they asked their daughter two years later if she remembered going she answered no. At the time of the trip to Disney World, the couple's daughter was MOST likely _____ years of age
Answer:
3
Explanation:
1-3 age is hard to remember
A 1500 kg car is moving at 15m/s what is the impulse experienced by the car
*Pls put the formula of how you did it too*
Answer:
22500 Ns
Explanation:
Given,
Mass ( m ) = 1500 kg
Velocity ( v ) = 15 m/s
Formula : -
Impulse = mv
Impulse
= 1500 x 15
= 22500 Ns
Therefore,
22500 Ns is the impulse experienced by the car.
Note : -
Ns is the unit of impulse.
Humpback whales are known to produce a collection of elaborate
and repeating sounds with frequencies ranging from 20 Hz to 10 kHz. The sound
waves travel through water at speeds of approximately 1400 m/s. Determine the
wavelengths of the waves at the lower and the upper end of this frequency
range.
Answer:
70 m.
Explanation:
Given,
Frequency, f = 20 HZ
speed of sound, v = 1400 m/s
wavelength of the waves = ?
we know,
v = f λ
Hence, the wavelength of the wave is equal to 70 m.
An air track car with a mass of 5-kg and velocity of 2 m/s to the right collides with a 3-kg car moving to the left with a velocity of 3 m/s. After the collision, the two cars bounce off of each other and the 5-kg car bounces back with a velocity of 1 m/s. What is the new velocity of the 3-kg car after the collision?
Answer: 2 m/s to the right
Explanation:
This is a conservation of momentum question:
p before = p after → m1v1 + m2v2 = m3v3 + m4v4
**Note- if the speed is to the left, plug in a negative v!
5(2) + 3(-3) = 5(-1) + 3(v4) → 1 = -5 + 3v4 → v4 = +2 m/s :)
A 2.0 Kg box is being pulled up a ramp with a force of 25.0 Newtons. The ramp has an incline of 30 degrees. If the coefficient of friction is 0.752, find the acceleration of the block up the ramp. You may round your answer to the nearest tenth where necessary!!!
Answer:
The acceleration of the block is 1.21 m/s².
Explanation:
Given that,
Mass = 2.0 kg
Force = 25.0 n
Angle = 30°
Coefficient of friction = 0.752
We need to calculate the acceleration of the block
Using balance equation
[tex]F-(mg\sin\theta+\mu mg\cos\theta)=ma[/tex]
Put the value into the formula
[tex]25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)=2.0a[/tex]
[tex]a=\dfrac{25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)}{2.0}[/tex]
[tex]a=1.21\ m/s^{2}[/tex]
Hence, The acceleration of the block is 1.21 m/s².
Somebody plz answer both these questions correclty thanks!!!!!
(WILL MARK BRAINLIEST) promise :)
:D
Answer:
Which questions do you need help on?
When you throw a sheet of paper and a stone from a certain height under what condition will the two fall to the ground at the same time?
Answer:
when there is no resistance.( in a vacuum)
Explanation:
this is because of acceleration due to gravity that is equal on both objects.
help plzz i nned to do this
Hello!
Answer:
The answer is D
Wish you luck!
A drag racer starts from rest and accelerates at 10 m/s squared for the
entire distance for 5.4 seconds. What is the velocity of the car at the end
of the race?
Answer:
54 [tex]\frac{m}{s}[/tex]
Explanation:
[tex]v=u+at[/tex]
where [tex]u=[/tex]initial velocity
[tex]v=0+(10\frac{m}{s^{2} } )[/tex]×[tex](5.4s)[/tex]
[tex]v=54\frac{m}{s}[/tex]
Jalen is sliding around on his kitchen floor in his
socks going 3m/s. He gets to the living room, and
when he slides onto the carpet, his velocity slows
down to 1m/s. He also notices that his feet feel
warmer. Why did this happen? Explain your
answer.
Answer:
his feet feel warmer because of friction. when friction takes place then an object will warm up because friction is a universal law that always takes place. if you rub your hands together, you also experience the heat of frictional I hope that helped.
_________ is the systematic self-observation and analysis of one’s conscious experience.
A.
Interrogation
B.
Introgression
C.
Internalization
D.
Introspection
Please select the best answer from the choices provided
A
B
C
D
Answer:
D:Introspection
Explanation:
Answer:
D
Explanation:
took the test got it right
Why do some people in the music industry still prefer analog music storage? Analog introduces background noise to the original recording. Analog devices record the music in its original form. It takes less time to record the music through analog devices. The equipment is lighter and less bulky for recording analog signals.
The people in the music industry still prefer analog music storage. Because analog devices record the music in its original form.
What is analog device storage?There are advantages to both digital and analog music. Even today, music connoisseurs debate the subject incessantly.
Understanding both recording methods can help you appreciate music more by providing you with a better understanding of playback depth. Analog and digital songs have different effects on playback,
But both can identify the various aspects of a song. In honor of music as a whole, we're diving into both and bringing out the best of each.
Hence people in the music industry still prefer analog music storage. Because analog devices record the music in its original form.
To learn more about analog device storage refer to the link;
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Answer:
B
Explanation:
50 points for correct answer.
write the ways to induce current in a circuit?
The following are the several approaches to produce a current in a coil:
An electric current is induced in a coil when it is rapidly moved between the two poles of a horseshoe magnet.
An electric current is induced when a magnet is shifted relative to a coil.
The current in the coil may be generated by keeping it fixed and rotating a magnet within it.
A steady alteration of the current in 'another coil' kept near it in a coil might create the current...
<3
Participating in physical activity can help to reduce stress in all of the following ways except: a. it releases stored energy b. it causes fatigue and exhaustion c. it releases tension d. it relaxes muscles please select the best answer from the choices provided. a b c d
Participating in physical activity can help to reduce stress in all of the following ways except it causes fatigue and exhaustion. Option b is correct.
What is physical activity?Anybody movement requiring energy expenditure that is produced by skeletal muscles is defined as physical activity. Physical exercise encompasses all forms of movement,
Whether it is done for fun, to go to and from locations, or as part of one's job. Physical activity, both moderate and strenuous, is beneficial to one's health.
Physical activity is good for your heart, body, and mind. Physical exercise aids in the prevention and treatment of noncommunicable illnesses including heart disease, cancer, and diabetes.
Depression and anxiety symptoms are alleviated by physical activity. Physical activity improves one's ability to think, learn, and judge.
Participating in physical activity can help to reduce stress in all of the following ways except it causes fatigue and exhaustion.
Hence option b is correct.
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Answer:
b
Explanation:
did on edge
1.What is light?
2.How light is being measured?
3.How light is being produced naturally and artificially?
4.How light is being detected?
5.What is the difference between light and ambient?
6.What are the modes of light sensors? Explain each.
Answer:
1. light is electromagnetic radiation within the portion of electromagnetic spectrum that is perceived by the human eye.
2. it's measured in footcandles or lux- it is the amount of light (lumens) falling on a Surface (over any given square foot or square meter). therefore, light intensity is measured in terms of lumens per square foot (footcandles) or lumens per square meter (lux).
3. natural light,, which produces heat and color comes from the radiation given off by the sun. It is then filtered through the Earth's atmosphere and absorbed by plants. Artificial light sources can consist of a filament that uses electricity or halogen gas to go or an electronic device that emits light.
4. most of our conscious vision stem from photoreceptors in the retina, the light-sensitive layer at the back of our eyeball. In animals with backbones (vertebrates) cells that detect light for vision are vaguely shaped like rods or cones giving them their familiar names.
5. there is a difference between ambient and task lighting. task lighting provides focus light so you can see better perform a certain task. while ambient fixtures offer general lighting for your home, distribute light evenly as well as helps create a mood.
6. what are the types of light sensors
• photoresistors (LDR)
• photodiode (how they look like)
• phototransistors
Explanation:
I hope this helped, I'm so sorry if it didn't .
What is the volume of the shape below?
Help me plzzzz
Answer:
20cm
Explanation:
2 × 5 × 2 = 20
Hope this helps.