Answer:
B) Polonium(Po)
8. What is the resistance of a 1100W hair dryer plugged into a 110V outlet with a 10A current flowing through it?
Solve using the GUESA method
Answer:
11 ohms
Explanation:
V=IR
110=10xR
R=11 ohms
Explanation:
v=IR
110=10R
R=11
resistance of the hair dryer=11
Which of the following statements is TRUE in regards to Signal #2?
1) Signal #2 is a digital signal that transmits signals continuously.
2) Signal #2 is a digital signal that transmits signals in segments/intervals.
3) Signal #2 is an analog signal that transmits signals continuously.
4) Signal #2 is an analog signal that transmits signals in segments/intervals.
Answer:
2) Signal #2 is a digital signal that transmits signals in segments/intervals.
Explanation:
Signals are form of information propagating from the source to a display unit for appropriate interpretation. It can be either in a digital or analogue form.
A digital signal is a definite signal which is discrete in time and amplitude. It is mostly in the form of codes obtained from set of values. Graphically it transmits in the form of 1 and 0, showing a point of maximum amplitude (1) and minimum amplitude (0).
Analog signal is continuous signal describing the variation of two variables with respect to time.
A hot air balloon contains 85,000 moles of air. To what temperature must the
air be heated to fill a volume of 2500 m at a pressure of 100 kPa? A. 260K
B. 2900 K C. 350 K
D. 0.35 K
Answer:
B is the best answer for this question
Order the sounds made by these sources from highest to lowest pitch.
telephone, piano, motorcycle, lawn mower
lawn mower, motorcycle, piano, telephone
motorcycle, telephone, piano, lawn mower
lawn mower, piano, telephone, motorcycle
The order of the sounds made by these sources from highest to lowest pitch is motorcycle, telephone, piano, lawn mower. So, the third option is correct.
What is meant by pitch of a sound ?Pitch of a sound is defined as the characteristic of sound that helps us to sense the shrillness of a sound according to the frequency of vibration of the sound.
Here,
The various instruments given are considered as some sources of sound. Among them, the motorcycle is the sound source having the highest pitch.
Then comes the telephone that has second highest pitch.
The sound source that has the third highest pitch is the piano.
Among all the instruments, the lawn mower have the least pitch.
Hence,
The order of the sounds made by these sources from highest to lowest pitch is motorcycle, telephone, piano, lawn mower.
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Crust describes the outermost shell of a terrestrial planet. Earth’s crust is relatively thin, just 40-kilometers (25-miles) deep. Earth's crust can be divided into two types: continental and oceanic. How do these two types of crust differ? All BUT ONE could apply.
Answer:
?
Explanation:
What was significant about the clay samples from the Western Hemisphere? How was the Alvarez hypothesis modified in response?
Final answer:
Clay samples from the Western Hemisphere are significant for studying ancient migration patterns, but they are not connected to the Alvarez hypothesis, which concerns the asteroid impact at the end of the Cretaceous period. The discussion of human migration into the Americas includes theories of both coastal and interior pathways. European contact led to diseases affecting the Indigenous population, with the post-colonization period marking the lowest numbers due to disease and conflict.
Explanation:
The significance of clay samples from the Western Hemisphere lies in their potential to provide insight into ancient migration patterns in the Americas. When discussing significant findings like clay samples or the Alvarez hypothesis, it's worth noting that the latter relates to the mass extinction at the end of the Cretaceous period, caused by an asteroid impact, rather than early human migration. Consequently, there's no direct modification of the Alvarez hypothesis in response to clay samples from the Western Hemisphere. In historical context, when dealing with human migration theories in the Americas, two predominant arguments arise: one supporting a coastal migration and the other an interior pathway. The debate over which came first remains unresolved, but both theories are supported by archaeological evidence.
As for the historical antecedents explaining why people in the Western Hemisphere became ill following contact with Europeans, it was largely due to a lack of immunity to diseases brought by Europeans, to which Indigenous populations had never been exposed. The year identified with the lowest population of Indigenous people varies according to different sources but is commonly placed after the European colonization, due to the devastating impact of disease, conflict, and dispossession.
Each alveolus is surrounded by a network of _____.
capillaries
arteries
veins
cilia
What is the relationship between the potential energy of a pendulum and the values of =(M) mass, (H) height, and (P) gravitational acceleration?
Answer: P.E = MPH
Explanation: given that
Mass = M
Height = H
Gravitational acceleration = p
The relationship between the potential energy of a pendulum and all these values will be
P.E = MPH
PLEASE HELP I WILL GIVE MAX POINTS
Collect the water sample in a glass tumbler and then put a straw in the water. Record the bending in the straw using a protractor and the angle is the answer required
Craig used 60 joules of work to lift a weight in 5 seconds.how much power was used
Answer:
the answer is 12
Explanation:
the answer is 12 because u have to think about 5 times 12 which would look like this: 5 x 12 = 60 would have to divide 60 from 5 like it says in the question.
If the current at a certain point is 2.0 A, then _______ C of charge flow past that point in 10 seconds.
6 points
5 C
20 C
12 C
0.2 C
Final answer:
If the current at a certain point is 2.0 A, then 20 C of charge flow past that point in 10 seconds, as current is the flow of charge per unit time.
Explanation:
The solution goes as follows: If the current at a certain point is 2.0 A, then the amount of charge that flows past that point in 10 seconds can be calculated using the relationship between current (I), charge (Q), and time (t), which is given by the formula I = Q/t. Therefore, to find the charge, Q, we rearrange the formula to Q = It. Plugging in the given values, we get Q = 2.0 A × 10 s = 20 C. This means that 20 coulombs of charge flow past the point in 10 seconds.
1. Calculate the velocity of a 0.8 kg kitten with a forward momentum of 5 kg*m/s.
2. The net forward force on the propeller of a 3.2 kg model airplane is 7 N. What is the acceleration of the airplane?
FIRST PERSON TO RESPOND WILL GET THE BRAINLIEST ANSWER!!
Q.1
Answer . Momentum = mass x velocity
Momentum/mass = velocity
5/0.8 = velocity
6.25 m/s = velocity
Q.2
Answer . F = ma => a = f/m => a = 7/3.2 => a = 2.1875m/s²
The velocity of a 0.8 kg kitten with a forward momentum of 5 kg*m/s is 6.25 m/s. The acceleration of a 3.2 kg model airplane with a net forward force of 7 N is 2.1875 m/s².
Explanation:To calculate the velocity of a kitten with a given momentum, we use the formula p = m * v, where p is the momentum, m is the mass, and v is the velocity. Thus, the velocity v can be calculated by rearranging the formula to v = p / m. Given a momentum of 5 kg*m/s and a mass of 0.8 kg, the kitten's velocity is v = 5 kg*m/s ÷ 0.8 kg = 6.25 m/s.
For the acceleration of the model airplane, we use Newton's second law of motion, which is F = m * a, where F is the net force, m is the mass, and a is the acceleration. With a net force of 7 N and a mass of 3.2 kg, the acceleration is a = F / m = 7 N ÷ 3.2 kg = 2.1875 m/s².
What is acceleration?
Change in velocity
Change in displacement
change in distance
Answer:
acceleration is the rate of change of velocity
Which properties do metalloids share with metals?
PER
Both are shiny and are brittle.
Both are very conductive and are dull.
Both are brittle and are gases at room temperature.
Both are shiny and are solid at room temperature.
O
The properties that can be associated with both metalloid and metals as regards this question is D; Both are shiny and are solid at room temperature.
A metalloid can be regarded as chemical element that has its properties as intermediate between metals and nonmetal.They are:solid at room temperatureThey can appear shinnyA metal can be regards as chemical element, they are material with high usefulness. Some of their properties are;solid at room temperaturelustrous appearanceconductors of electricity and heatThey are malleable or ductile.They can appear shinnyExamples of metal are potassium, calcium.
Metals are not brittle, and they are not liquid at room temperature.Therefore, option D is correct, because both metals and metalloid are seen as solid under room temperature.
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Which of the following pairs of terms directly relates to the actual brightness of a star?
A. absolute magnitude and luminosity
B. apparent magnitude and luminosity
C. size and luminosity
D. absolute magnitude and apparent magnitude
Answer:
D. absolute magnitude and apparent magnitude
Absolute magnitude and apparent magnitude are the pairs of terms
directly relates to the actual brightness of a star.
Star brightness can be viewed in two ways and they include
Absolute magnitude Apparent magnitudeApparent magnitude refers to the how the brightness of the star is viewed
from the Earth while absolute magnitude refers to how the stars are viewed
from a standard distance of 32.6 light-years, or 10 parsecs.
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When two bodies are charged, the total charge before and after charging remains the same because of:
a.
quantization of charges
c.
law of induction
b.
conservation of charges
d.
Coulomb’s law
Answer:
b. Conservation of charges
Explanation:
Based on the time measurements in the table, what can
be said about the speed of the car on the lower track as
compared to the higher track?
How can the reasoning for the above answer be best
explained? On the higher track, the elapsed time is
Calculate speeds for each track. How much faster was
the car on the higher track than the lower track?
Answer:
1) car travel faster on the higher track
2) shorter
3) 0.56m/s
Explanation:
Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?
A. 4%
B. 25%
C. 75%
D. 400%
Correct option is B. The efficiency of the machine is 25%, determined by dividing the work output (500 J) by the work input (2000 J) and then multiplying by 100 to get the percentage.
The efficiency of a machine is defined as the ratio of the work output to the work input, often expressed as a percentage. In this case, Carlota does 2000 J of work on the machine, and the machine does 500 J of work. To find the efficiency, we use the formula:
Efficiency (%) = (Work Output / Work Input) x 100
So, the calculation would be:
Efficiency (%) = (500 J / 2000 J) x 100 = 25%
The correct answer is B. 25%.
When a rubber ball is thrown against a wall, energy is transferred and transformed. Select the
statement from the list below that does not support the law of conservation of energy. *
(1 Punto)
A. Before the ball is thrown, it has the highest potential energy due to the position of
S
in
O
B. When the ball is released, the thrower's arm transfers its energy to the ball.
O
C. After it is thrown, all of the ball's potential energy becomes kinetic energy.
O
D. When the ball hits the wall, it compresses, transforming its kinetic energy to potential energy.
E. The ball returns to its original shape and propels from the wall, transforming its potential energy to kinetic
energy.
energy.
The incorrect statement that does not support the law of conservation of energy is when the ball hits the wall, it compresses and transforms its kinetic energy to potential energy.
Explanation:The correct statement that does not support the law of conservation of energy is D. When the ball hits the wall, it compresses, transforming its kinetic energy to potential energy. According to the law of conservation of energy, energy cannot be created or destroyed, only transferred or transformed. Therefore, when the ball hits the wall, its kinetic energy is not transformed into potential energy, but rather into other forms of energy such as sound and heat.
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Which diagram shows a light ray moving from a more dense into a less dense medium? A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at a shallower angle relative to the horizontal line below. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at the same angle relative to the horizontal line above. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at a steeper angle relative to the horizontal line below.
Answer:
its A
Explanation:
A black horizontal line intersected at right angles by a dotted orange line labeled Normal. Therefore, the correct option is option A.
What is refraction?Refraction in physics is indeed the redirection of a wave as it travels through one medium and then another. A change inside the medium or a change inside the wave's speed might both result in the redirection. Although refraction of light waves is the most often seen phenomena, refraction may also occur with sound waves as well as water waves.
The wave speed change and the initial wave propagation direction in relation to the wave speed change both affect the extent to which a wave is refracted. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. This shows a light ray moving from a more dense into a less dense medium.
Therefore, the correct option is option A.
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A piece of aluminum requires 4,000 J of energy to change
from 68°C to 110° C. How much aluminum is there?
need help
Answer:
Mass, m = 105.58 g
Explanation:
We have,
Heat required in aluminium to change the temperature from 68°C to 110°C. It is required to find the mass of aluminium.
Concept used : Specific heat capacity
Solution,
The heat required to raise the temperature is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat capacity, for Aluminium, c = 0.902 J/g-°C
[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{4000\ J}{0.902\ J/g^{\circ} C\times (110-68)^{\circ} C}}\\\\m=105.58\ g[/tex]
So, the mass of aluminium is 105.58 grams.
If you were doing a research study on sleep and student achievement, which
of the following might be the hypothesis?
O
A. Students get enough sleep to be effective.
O
B. Memory is affected for students.
O
C. Achievement isn't dependent upon sleep.
O
D. The amount of sleep a student gets affects student achievement.
The hypothesis for a research study on sleep and student achievement would be that the amount of sleep a student gets affects student achievement. Option D. is correct.
Explanation:The hypothesis for a research study on sleep and student achievement would be D. The amount of sleep a student gets affects student achievement. This hypothesis suggests that the amount of sleep a student gets has an impact on their academic performance.
To support this hypothesis, the study would collect data on students' sleep duration and analyze their academic achievements, looking for any correlation between the two.
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The right-hand rule uses the______ to predict the direction of a force on a positive charge moving in a magnetic field.
a)pointer finger
b)thumb
Answer:b
Explanation:
Thumb rule show the direction of force due to 90 degree angle.
What is the amplitude and wavelength of the wave shown below?
A. Amplitude: 30 cm; wavelength 60cm
B. Amplitude: 30 cm; wavelength 110cm
C. Amplitude: 60 cm; wavelength: 60cm
D. Amplitude: 60cm; wavelength 110cm
Choice-B is correct, but only halfway. This weird drawing appears to show TWO waves travelling through the same medium.
-- The big wavy line is a transverse wave, with amplitude=30cm and wavelength=110cm.
-- The short vertical lines are placed where the medium is squished, with thin spread out regions between them. This is a longitudinal wave, with amplitude=5cm and wavelength=10cm.
This could be the picture of a sound wave zipping along through the top of a train of 30cm waves on the lake.
what is potential energy
Answer:
potential energy is energy that is being stored that is going to go into motion. Hope that helps a little
Explanation:
Answer:
Potential energy is the stored energy in an object.
Explanation:
When a roller coaster is going up it is gaining potential energy. When the roller coaster is at the highest point it has the most potential energy, stored energy.
If you are walking or running at equal distances in equal amounts of time you are traveling at a(n) ___.
Answer:
Constant speed is your answer.
Explanation:
I NEED THIS FAST
Which of the following is true of real machines?
o work output is less then work input
o work output equals work input
o work input is decreased because of friction
o work output is greater than work input
Answer:
Work output is less than work input.
Explanation:
Work output can never be greater than work input. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work. When a machine changes the size of the force, the distance through which the force is exerted must also change.
Brainliest???
A force of 310.0 N is used to push a 120 kg 30.0 m horizontally 3.00 s.
(a) Calculate the work done on the mass.
[ ] × kJ
(b) Calculate the power developed.
[ ] kW
Explanation:
We have,
Force acting on the mass is 310 N
Mass, m = 120 kg
Distance covered by the mass is 30 m
Time, t = 3 s
(a) The work done on the mass is given by the product of force and displacement such that,
[tex]W=Fd\\\\W=310\times 30\\\\W=9300\ J[/tex]
(b) The rate at which the work is done is called power developed. Its formula is given by :
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{9300}{3}\\\\P=3100\ W[/tex]
How many times louder is the intensity of
sound at a rock concert in comparison with
that of a whisper, if the two intensity levels
are 130 dB and 2 dB, respectively?
Answer:[tex]6.309\times 10^{12}[/tex]
Explanation:
Given
Intensity level of rock concert [tex]=130\dB[/tex]
Intensity level of Whisper [tex]=2\dB[/tex]
Intensity of sound is given by
[tex]I=10\log _{10}(\frac{I}{I_o})[/tex]
where [tex]I_o=10^{-12}\ watts/m^2[/tex]
and difference in the intensity of the two sounds is [tex]db=130-2=128\ dB[/tex]
and
[tex]db=10\log _{10} (\frac{I_1}{I_2})[/tex]
[tex]12.8=\log _{10}(\frac{I_1}{I_2})[/tex]
[tex]\frac{I_1}{I_2}=10^{12.8}[/tex]
[tex]\frac{I_1}{I_2}=6.309\times 10^{12}[/tex]
Thus intensity of Rock concert is [tex]6.309\times 10^{12}[/tex] times louder than that of a whisper
Epeirogeny is crustal uplift without deformation. True False
Answer: True
Explanation: Epeirogeny is the regional uplift of an extensive area of the earth's crust.