Explanation:
In short, when we switch off a branch, the remaining branch still forms a complete circuit with the battery, so electricity still pass through the remaining branch.
Technically speaking, the voltage in each branch is the same, and the resistance of the light bulb remains unchanged (neglect effect of temp.) by V=IR, the current should remain unchanged after switching off the other branch.
For every 200 J of energy transferred to a hairdryer, 160 J are transferred to the air to heat it and move it. 35 J are transferred through the case to your hands as thermal energy, and 5 J are transferred to the surroundings as sound. Calculate the efficiency of the hairdryer.
The efficiency of the hairdryer is determined as 80%.
What is the efficiency of the hairdryer?The efficiency of the hairdryer is the ratio of the output energy to the input energy multiplied by 100 percent.
Mathematically, the efficiency of the hairdryer is given as;
E = (output energy / input energy) x 100%
The given parameters;
total output energy = 160 Jtotal input energy = 200 Jtotal energy wasted = 35 J + 5 J = 40 JThe efficiency of the hairdryer is calculated as follows;
eff = (160 J / 200 J) x 100%
eff = 80 %
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A wave has a frequency of 46hz and a wavelength of 1. 7 meters. What is the speed of this wave?.
The speed of a wave with a frequency at 46 Hz as well as a wavelength = 1.7 meters is 78.2 m/sec.
What is the name of wavelength?The Greek letter λ is frequently used to represent wavelength. The name wavelength is also occasionally used to refer to modulated waves, their sinusoidal envelopes, or waves created by the interference of multiple sinusoids.
What is the purpose of wavelength?The distance between each trough or the difference between each wave's crest and the next one. One of "yardsticks" used to gauge radiation levels is this. The SI unit measuring wavelength is the metre, which is frequently abbreviated as m. The wavelength of an object is measured using its multiples and fractions.
Briefing:Wavelength = 1.7 m
Frequency = 46 Hz
v denotes the wave's speed, w its wavelength, and f its frequency.
f = v/w,
= 46 =v/1.7
v = 78.2 m/sec
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Which are two pieces of evidence supporting the big bang theory?
A. black holes and pulsars
B. dark matter and dark energy
C. eclipsing binaries and quasars
D. cosmic background radiation and Hubble's law
Group of answer choices
Answer:
I think B but i'm not sure.
Explanation:
A car traveled 1,215 km West from El Paso to Dallas in 13.5 hours. What was its velocity?
A. 90m/s West
B. 90km/h
C. .09km/h West
D. 90km/h West
3rd form worksheet1. True or False. If the statement is not true, please correct it.a) Metrology is the study of measurement taking _____________b) There are 10 fundamental quantities _____________c) Derived quantities are the combination of two or more basic quantities _____________d) Magnitude implies that the wind outside is strong _____________e) The units we use are called the international system of units and are internationalagreed on _____________f) Physical quantities are the result of imagination _____________2. List all the fundamental quantities and their S.I units.3. By using the given formulas give the correct S.I unit for each of the derived quantities givenbelow:a) Force = mass x accelerationb) Acceleration = change in speed timec) Speed = distance timed) Pressure = Force Areae) Area = length x Length4. List the prefixes learnt in class along with their numerical values and symbol5. Convert between the following prefixes:a) 1mm to kmb) 2 cm to kmc) 78 Mg toa) A car goes from 100m/s to 55m/s in a time of 5s. Calculate the acceleration and forceexerted on the car if it has a mass of 1380kg. Acceleration = change in speed time andForce = mass x acceleration
Metrology is the study of measurement standards. (True). There are seven fundamental quantities. (False:
There are seven fundamental quantities in the International System of Units (SI). They are length, mass, time, electric current, temperature, amount of substance, and luminous intensity.). Derived quantities are the combination of one or more basic quantities. (True). Magnitude does not imply that the wind outside is strong. (True: Magnitude refers to the size or quantity of a physical quantity, and it does not specifically indicate the strength of the wind.)The units we use are called the international system of units and are internationally agreed upon. (True). Physical quantities are observed or measured properties of objects and phenomena. (True: Physical quantities are not the result of imagination; they are measurable attributes of the physical world.)
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if i move 3 m east and 4 m north what is my displacement
If I move 3 m east and 4 m north, then my displacement would be 5m.
What do you understand by displacement?In geometry and mechanics, displacement is defined as a vector whose length is the shortest distance from initial to the final position of a point P undergoing the motion.
If an object moves relative to the reference frame—for example, if professor moves to the right relative to whiteboard or passenger moves toward the rear of airplane—then object's position changes. And this change in position is known as displacement.
Given AB= 3m east and BC= 4m north
AC= √ 3² + 4²= 25
So, AC, displacement = 5m
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One sprinter has a stride of 120cm, another 75cm. How many steps do they each take if they run a 100m race?
Explanation:
100 m / (1.20 m) = 83.3
100 m / (0.75 m) = 133.3
Rounded up, the first sprinter takes 84 steps, and the second sprinter takes 134 steps.
Two point charges are separated by a certain distance. How does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled?
Answer:
The field will remain the same
Explanation:
This is because electric field given as
E1= kq1/r²
And that of second charge
E² = kq2/r²
Is not affected by the size of the second charge q2
Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)?
(1 point)
oxygen (O)
lithium (Li)
bromine (Br)
cesium (Cs)
Lithium element contains one electron therefore valence electron will be one.
The highest level of energy is due to valence electrons which are available to the atom.
The calcium has 2 valence electrons which has electrons with high energy.
These energy will be used by the electron during the chemical reaction, and they will either lose or gain valence electron.
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Answer:
calcium
Explanation:
2 electron
Complete the sentence with the word "element" or "compound."
O is a(n) ____
and H2O2 is a(n) ____
.
Answer:
"element"= There are four basic sentence patterns based on sentence construction element
Answer:
1st one. Element
2nd one. Compound
Explanation:
A cyclist acceleration from 0m/s to 8m/s in 3second. what is his acceleration?
Answer:
2.66 m/s² .
Explanation:
Initial velocity , u = 0 m/s
Final Velocity , v = 8 m/s
Time Taken , t = 3 s
So , Acceleration = (v-u)/t = (8 m/s - 0 m/s) /3 sec . = 8/3 m/s² = 2.66 m/s²
In Wikipedia, look up "Kelvin" and answer this question: The Kelvin scale is a temperature scale like the Celsius temperature scale (1 deg C = 1 deg K), but they are shifted from each other. Kelvin is the predominantly used for scientific purposes. What is the lowest theoretical temperature that can exist in the universe on the Kelvin scale?
the lowest theoretical temperature that can exist in the universe on the Kelvin scale is zero kelvin (0 K)
Absolute zero, technically known as zero Kelvin, corresponds to -273.15 degrees Celsius or -459.67 degrees Fahrenheit and marks the point on the thermometer where the system reaches the lowest possible energy or thermal motion. However, there is a catch.
Absolute zero cannot be reached.
Two of the most commonly used temperature measurement scales in the thermometer industry are the Kelvin and Celsius scales. A value of 1 degree on the Kelvin scale is the same as a value of 1 degree on the Celsius scale. That is, the temperature difference or temperature change is the same on both scales.
You can use this relationship to convert Celsius to Kelvin.
Celsius = (Kelvin - 273.15)
0r
Kelvin = (Celsius + 273.15)
The Kelvin to Celsius formula is used to convert temperature expressed in Kelvin to Celsius.
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A stone is thrown horizontally at 6.88 m/s from a cliff 95.0 m high. How far from the base of the cliff will the stone strike the ground
According to given statement:
(a)The time it takes to down the cliff is given by y = 4.40 s.
(b)The distance from the cliff's base where the stone will ground is x=30.272 m.
How does physics determine the height of a cliff?Use a timer to time how long it takes a rock to fall from a cliff to the water.
Add 16 to the amount after multiplying it by itself.
That should be pretty close to the cliff's height in feet.
Briefing:(a)
Since v\(_y\) = 0
y - v\(_y\)t = -1/2gt²
y = -1/2gt²
or \(t=\sqrt{-\frac{2 y}{g}}\)
= \(\sqrt{\frac{-(2)(-95.0 \mathrm{~m})}{9.80 \mathrm{~m} / \mathrm{s}^2}}\)
y =4.40 s
(b)
x = v\(_x\)t
x= (6.88 m/s)(4.40 s)
x=30.272 m
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The complete question is-
A stone is thrown horizontally at 6.88 m/s from a cliff 95.0 m high.
(a)How long does it take to reach the bottom of the cliff?
(b)How far from the base of the cliff will the stone strike the ground?
Which occurs when a warm fluid cools down?
⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔⇔
Answer: Energy is released to the environment.
Explanation:
A ball is thrown upward from a cliff. The ball rises to its maximum height and then falls into the valley below. Suppose the ball is thrown upward at 30m/s and lands 9s after it is thrown. What is the height of the cliff?
Answer:
The height of the cliff is approximately 127.31 meters
Explanation:
The given parameters are;
The upward speed of the ball = 30 m/s
The time after the ball is thrown before it lands = 9 s
We have;
The time to maximum height;
v = u - g·t
Where;
v = The velocity at maximum height = 0 m/s
u = Initial velocity = 30 m/s
g = The acceleration due to gravity = 9.81 m/s²
∴ 0 = 30 - 9.81 × t
t = 30/9.81 = 3.06 s
The maximum height can be obtained from;
v² = u² - 2·g·s
v = 0 m/s
u² = 2·g·s
30² = 2 × 9.81 × s
s = 30²/(2×9.81) = 45.87 m
The time from maximum height to landing = 9 - 3.06 = 5.942 s
The height to landing
s = u·t + 1/2·g·t².
Here, u = 0 m/s
s = 0×5.942 + 1/2×9.81×5.942² = 173.1766 m
s = 173.1766 m.
The height of the cliff = 173.1766 m. - 45.87 m. ≈ 127.31 m.
help me please (。'-‿-。)
Answer:
the layers of atmosphere are heated through radiation and convection.
Explanation:
heat is transferred from sun through radiation
and current through convection
Diatomic oxygen has a molar mass 16 times that of diatomic hydrogen. The root-mean-square speed vrms for diatomic oxygen at 50∘C is:
a) (16)(2000m/s)=32000m/s
b) (4)(2000m/s)=8000m/s
c) 2000m/s
d) (14)(2000m/s)=500m/s
e) (116)(2000m/s)=125m/s
f) none of the above
The molar mass of diatomic oxygen is sixteen times that of diatomic hydrogen. The diatomic oxygen root-mean-square speed ( \(V_rms\) )at 50°C is: (d) (14)(2000 m/s) = 500 m/s
The root-mean-square speed (\(\[v_\text{rms}\)) of a gas molecule is given by the equation:
\(\[v_\text{rms} = \sqrt{\frac{3kT}{m}}\]\)
where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the molar mass of the gas.
In this case, we are comparing diatomic oxygen (O₂) and diatomic hydrogen (H₂), where the molar mass of oxygen is 16 times that of hydrogen.
Since the molar mass of hydrogen (H₂) is approximately 2 g/mol, the molar mass of oxygen (O₂) would be approximately 16 * 2 = 32 g/mol.
Converting the molar mass to kg/mol (by dividing by 1000), we get 0.032 kg/mol for oxygen.
Now, plugging in the values into the formula, we have:
\(\[v_\text{rms} = \sqrt{\frac{3kT}{m}}\]\)
\(\[v_\text{rms} = \sqrt{\frac{3k(50 + 273.15)}{0.032}}\]\)
Calculating this, we find that the \(\[v_\text{rms}\) for diatomic oxygen at 50°C is approximately 503.59 m/s.
Therefore, the correct answer is: (d) (14)(2000 m/s) = 500 m/s
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Jim is meeting with his academic advisor. He is distracted by social media on his phone and not paying attention to the advisor. He figures he will change his major anyway, so the conversation seems pointless. Which style of listening is Jim displaying?
active
involved
passive
detached
Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions.
Jim is displaying the style of listening known as "detached." This style of listening is characterized by a lack of attention, interest, or engagement in the conversation. Jim's distraction with social media on his phone shows that he is not actively participating or focusing on what his academic advisor is saying. Additionally, his belief that the conversation is pointless because he plans to change his major indicates a disinterest in the discussion and a lack of motivation to actively listen and engage with his advisor.
Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions. By actively participating and listening, he can make more informed choices about his major and benefit from the advice and expertise of his advisor.
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Jim is displaying detached listening as he is being physically present in conversation with his academic advisor but his focus is elsewhere, particularly, his phone.
Explanation:The style of listening that Jim is displaying is detached. This is because he is not paying attention to his advisor and is instead distracted by his phone. Detached listening is when one is physically present in a conversation but not mentally or emotionally engaged. Examples include browsing on the phone or thinking about other things while someone is talking.
In contrast, active or involved listening would involve fully concentrating, understanding, responding, and then remembering what is being said. Considering that Jim is mainly focused on his phone, he is not displaying any signs of this type of engagement with his advisor, hence, detached is the appropriate choice to describe his listening style.
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A certain simple pendulum has a period on the earth of 1.70s . What is its period on the surface of Mars, where g=3.71m/s^2?
The period of the pendulum on the surface of Mars, where g = 3.71m/s², would be the same as the period on Earth, 1.70s. The pendulum on the surface of Mars has a period of roughly 3.31 seconds, according to our calculation of this expression.
A basic pendulum's period is determined by the equation T = 2(L/g), where T is the period, L is the pendulum's length, and g is the acceleration brought on by gravity.
L = (T/(2))2g can be solved for on Earth with a period of 1.70s by rearranging the equation.
Using the same equation and the Mars surface gravity, g = 3.71m/s2, we can now get the period on Mars' surface: T\(_{mars}\) = 2(L/g\(_{mars}\)).
The equation T\(_{mars}\) = 2(((T/(2))2g)/(g\(_{mars}\))) is obtained by substituting the expression for L and the surface gravity of Mars.
T\(_{mars}\) = T(g/g_Mars), to simplify the formula.
T\(_{mars}\) = 1.70s(9.81m/s2 / 3.71m/s) is the result of plugging in the data. The pendulum on the surface of Mars has a period of roughly 3.31 seconds, according to our calculation of this expression.
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Microbial food infections are usually not seen until ______ after eating contaminated food.
Answer:
2 to 4 hours
Explanation:
Given that,
Microbial food infections
We know that,
Food infection :
When we eat old food, uncooked, fermented food, more junk food and contaminated food then 2 to 4 hours after eating we started vomiting, headache then we affected by food infections.
So, we can say that microbial food infections are usually not seen until 2 to 4 hours after eating contaminated food.
what is the main function of the lift pump
Answer:
draw fuel from the tank and supply pressurized fuel to the engine.
Draw a picture showing the possible phases of the moon in this binary star
system, do they look the same or different from those we see in the sky in
reality? (You might want to think about scale and how far the suns would be
when considering your answer.)
(Help ASAP)
Where is the safest spot in the house during a tornado, hail storm, and earthquake? Include separate answers.
Answer:
Explanation:
in a room with no windows that way it doesnt shatter. Usually a closet... or if you have a basement.sorry but that applies to all them
Explanation:
for the tornadoes
● go to the basement on the lowest floor.
● for heavy protection get under something heavy for example a heavy table.
hail storm
●go and run for a safe place closer _ by like for example garage,under a shed or service station awning.
● do not leave the vehicle until stops hailing.
earthquake
●The best move is getting under a strong table
or a desk
● hold on the shelter if not hold on your neck and head with both arms and hands.
In star wars, john williams used the __________ concept of romantic opera in which a character is assigned a short melody. so, famous characters like darth vader, princess leia, and han solo all have their own melody.
In Star Wars, John Williams used the Leitmotif concept of romantic opera in which a character is assigned a short melody.
It is used for famous characters like Darth Vader, Princess Leia, and Han Solo all have their melody.
Leitmotif is generally described as a recurring theme shown or appears over musical or literary composition.
Leitmotif is more common in operas and symphonic poems. It is attributed to a specific person, idea, or situation.
Hence, in this case, it is concluded that in the movie Star Wars, John Williams used the Leitmotif concept of romantic opera.
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step by step process please
I know the ans but not the process
pic attached
Answer:
\(\huge\boxed{\sf F= 350 \ N}\)
Explanation:
Considering pivot as the central point,
Key:
Torque = Force F × radius rAnticlockwise torque = Clockwise torque\(F_1r_1=F_2r_2\)
Here,
Anticlockwise force is FClockwise force is 600 N\(r_1=70+50= 120 \ cm = 1.2 \ m\)\(r_2=70 \ cm = 0.7 \ m\)Solution:Substitute the givens in the above formula.
\(F(1.2)=600(0.7)\\\\F(1.2)=420\\\\Divide \ 1.2 \ to \ both \ sides\\\\F=420/1.2\\\\F= 350 \ N\\\\\rule[225]{225}{2}\)
a bicycle racer sprints at the end of a race to clinch a victory. the racer has an initial velocity of 11.5 m/s when he was 300 m away from the finish line. he accelerates at the rate of 0.500 m/s/s for 7.00 s; and then the racer continues at the final velocity to the finish line. (a) what is his final velocity?
As a result, the racer's final velocity is 13.00 m/s after accelerating at 0.500 m/s2 for 7.00 s.
What is velocity?Velocity is a vector representation of an object's or particle's displacement with respect to time. The meter per second (m/s) is the standard unit of velocity magnitude (also known as speed). Alternatively, velocity magnitude can be expressed in centimeters per second (cm/s). The direction of movement of the body or item is defined by velocity. Speed is fundamentally a scalar number. Velocity is, in essence, a vector quantity. It is the pace at which distance changes. It is the displacement rate of change.
Here,
The final velocity can be found using the equation of motion,
vf = vi + at,
where vf is the final velocity, vi is the initial velocity (11.5 m/s), a is the acceleration (0.500 m/s^2), and t is the time for which the acceleration was applied (7.00 s).
Substituting the values we get,
vf = 11.5 + 0.500 * 7.00 = 13.00 m/s.
So, the racer's final velocity is 13.00 m/s as he accelerates at the rate of 0.500 m/s2 for 7.00 s.
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Mass of a body is constant but weight varies from place to place why?
Answer:
Explanation:
The body's mass is constant as it is a property of the body. Still, weight is a product of acceleration due to gravity and mass, which may vary from place to place because acceleration differs for different places.
What are some immediate effects that alcohol have on people?
Answer:
Depending on how much is taken and the physical condition of the individual, alcohol can cause:
-Slurred speech.
-Drowsiness.
-Vomiting.
-Diarrhea.
-Upset stomach.
-Headaches.
-Breathing difficulties.
-Distorted vision and hearing.
Explanation:
measurement of the speed of sound using the flash and report method
The flash and report method is a simple and common technique used to measure the speed of sound. In this method, an observer measures the time between seeing a flash, such as from a gunshot or a firecracker, and hearing the corresponding sound. The observer is usually at a known distance from the source of the flash and sound.
To perform the experiment, the observer stands at a fixed distance away from the source of the flash and sound. When the flash is seen, they start a stopwatch or use any other timing device. Once they hear the sound, they stop the timer and note the time difference between the flash and the sound. This time difference is the time it takes for the sound to travel from the source to the observer.
The speed of sound can then be calculated using the formula: speed of sound = distance / time taken. The distance between the observer and the source is divided by the time difference recorded to find the speed of sound in the medium (usually air).
It is essential to ensure that the distance between the source and the observer is accurate and that the observer's reaction time is considered when measuring the time difference. External factors such as temperature, humidity, and altitude also affect the speed of sound and should be taken into account.
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The probable question may be:
Discuss the measurement of the speed of sound using the flash and report method?
Define Velocity.
Have a Nice Day Ahead
Answer:
the speed at which something moves in a particular direction
Explanation:
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. ... Velocity is a physical vector quantity; both magnitude and direction are needed to define it.