Answer:
The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. If the temperature falls further, the top layer expands and remains on the top till it freezes.
Bryce has selected a major in political science but has a little interest in understanding public relations
Hi, you've asked an incomplete question. However, I assumed you want additional comments about this scenario.
Explanation:
Note, the term Major as used in academic contexts refers to a person's preferred interest or specialization at college or university.
Hence, the statement about Bryce appears to be contradictory, since we are told he "has little interest in understanding public relations".
A motor with an operating resistance of 24Ω is connected in a circuit witn 0.4A of current. The battery voltage must be volts
Answer:
Voltage = 9.6 Volts
Explanation:
Given the following data;
Resistance = 24Ω
Current = 0.4A
To find the voltage of the battery;
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = current * resistance [/tex]
Substituting into the formula, we have;
Voltage = 0.4 * 24
Voltage = 9.6 Volts
Therefore, the battery voltage must be 9.6 volts
The frequency of a wave is 2 Hz and the wavelength is 4 m. What is the wave speed?
Answer:
4/2=2m/s
Explanation:
1.-Una fuerza horizontal de 40 N es apenas suficiente para poner en marcha un trineo de 600 N sobre nieve compacta. Después de empezar el movimiento se requieren tan solo 10 N para mantener el trineo a rapidez constante. Halle los coeficientes de fricción estática y cinética
Answer:
Los coeficientes de fricción estática y cinética son [tex]\frac{1}{15}[/tex] y [tex]\frac{1}{60}[/tex], respectivamente.
Explanation:
Por la Primera Ley de Newton, sabemos que la fuerza externa debe tener igual magnitud y dirección contraria a la fuerza de reacción (fricción). Puesto que el trineo se mueve sobre una superficie horizontal, la magnitud de la fuerza normal es la del peso ([tex]W[/tex]), en newtons. El coeficiente de fricción estática ([tex]\mu_{s}[/tex]), sin unidad, es la razón de la fuerza de fricción justo antes del movimiento inminente ([tex]F[/tex]), en newtons, a la fuerza normal ([tex]N[/tex]), en newtons:
[tex]\mu_{s} = \frac{F}{W}[/tex] (1)
Si sabemos que [tex]F = 40\,N[/tex] y [tex]W = 600\,N[/tex], entonces el coeficiente de fricción estática es:
[tex]\mu_{s} = \frac{F}{W}[/tex]
[tex]\mu_{s} = \frac{40\,N}{600\,N}[/tex]
[tex]\mu_{s} = \frac{1}{15}[/tex]
El coeficiente de fricción cinética ([tex]\mu_{k}[/tex]), sin unidad, es la razón de la fuerza de fricción experimentada por el trineo en movimiento ([tex]F[/tex]), en newtons, a la fuerza normal:
[tex]\mu_{k} = \frac{F}{W}[/tex] (2)
Si sabemos que [tex]F = 10\,N[/tex] y [tex]W = 600\,N[/tex], entonces el coeficiente de fricción cinética es:
[tex]\mu_{k} = \frac{F}{W}[/tex]
[tex]\mu_{k} = \frac{10\,N}{600\,N}[/tex]
[tex]\mu_{k} = \frac{1}{60}[/tex]
Los coeficientes de fricción estática y cinética son [tex]\frac{1}{15}[/tex] y [tex]\frac{1}{60}[/tex], respectivamente.
A wave is travelling at 3000 m/s has a wavelength of 1 m.
a) Calculate the frequency of the wave.
b) Calculate the time period of the wave.
c) How many complete wave cycles will occur in:
i. 1 second
ii. 10 senconds
iii. 1 minute
Answer:
a] 3000hz
b]3.33 × 10⁻⁴
ci]300
ii] 3000
iii]60,000
Explanation:
If a wave is travelling at 3000 m/s and has a wavelength of 1 meter the frequency of the wave would be 3000 Hz and the time period of the wave would be 3.33×10⁻⁴ seconds.
What is the frequency?It can be defined as the number of cycles completed per second. It is represented in hertz and inversely proportional to the wavelength.
Frequency = 1/T
As given in the problem If a wave is travelling at 3000 m/s and has a wavelength of 1 meter,
The frequency of the wave would be 3000 Hz.
The time period of the wave would be 3.33×10⁻⁴ seconds.
There would be 3000 complete wave cycles in 1 second, 300 wave cycles in 10 seconds, and 50 wave cycles in 1 minute.
To learn more about frequency from here, refer to the link;
brainly.com/question/14316711
#SPJ2
If the speed of an object changes, the object must be experiencing an acceleration.
True or False
If the battery has a voltage of 24 Volts, Find the current when switch is closed.
Answer:
6amps
Explanation:
The question is not complete
Given data
voltage= 24volts
Say we have a resistance of 4 ohms
We can then find the current using the formula
V= IR
substitute
24= I*4
I= 24/4
I= 6 amps
Hence the current when the voltage is 24volt and a resistance of 4 ohms is
6amps
What is the mass number, symbol, and charge of an ion that contains 35 protons, 45 neutrons and 36 electrons?
Bromine contains 35 protons, 36 electrons, and 45 neutrons. The mass number of Bromine is 80. The ion charge of bromine is +7. "Br" is the symbol of Bromine.
Discussion about bromine:
Two chemists, Carl Jacob Löwig and Antoine Balard, independently discovered bromine in 1825 and 1826, respectively.
The chemical element bromine has the atomic number 35 and the symbol Br. It is the 3rd halogen, and at room temperature, it is a flammable red-brown liquid that easily evaporates to create a vapor of a similar color. Its characteristics fall in between those of iodine and chlorine.
Due to its high reactivity, elemental bromine does not naturally occur in its free form but rather as crystals minerals halide salts that are colorless and soluble, similar to table salt. Although the bromide ion (Br) is relatively uncommon in the Earth's mantle, its great solubility has led to its buildup in the seas.
Learn more about bromine here:
https://brainly.com/question/1952132
#SPJ1
Reflection off of a smooth surface like a mirror is an example of diffuse reflection.
true or false?
Answer:
true
Explanation:
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. ... This is called diffuse reflection. Diffuse reflection is when light hits an object and reflects in lots of different directions.
Answer:
false
its regular reflection.
hope it helps.
PLEASE HELP!!!!!!!!
An object's mass increases, multiplied by a factor of 6. What factor would its Kinetic Energy increase by?
Answer:
6 also
Explanation:
Since Kinetic Energy and mass are directly proportional, as one increases, the other will increase with the same magnitude
who discovered electricity
Answer:
Benjamin Franklin
Explanation:
sorry if wrong.
I don't know who it is surely.
Please help u guys acellus sucks
Answer:
6.0cm
Explanation:
Given
focal length = 15.0cm
object distance = 10.0cm
Required
Image distance v
Using the formula
1/f = 1/u + 1/v
1/15 = 1/10+1/v
1/v = 1/15 + 1/10
1/v = 2+3/30
1/v = 5/30
v = 30/5
v = 6.0cm
Hence the image distance is 6.0cm
Answer:
6.0 (2 sig figs)
Explanation:
Is it General Physics? I had it and passed the Final Exam with an A in the beginning of July!
If the wavelength of a wave stays the same and the speed doubles, what happens to the frequency of the wave?
Explanation:
velocity = wavelength × frequency => v= f1 × λ => f1 = v/ λ
λ = stays the same
v = doubles
2v = f2 × λ
2v/λ = f2
now ,
f2/f1= 2vλ/ vλ = 2
f2 = 2f1
therefore frequency is doubled
5. What type of sound wave shape forms behind an object traveling faster than the speed of sound?
- a cone
- a long, flat tail
- a bowl-shape
- a sphere
Which of the following depicts xylem?
PLEASE HELP!! Points will be given for suitable answer! Thank you!
Answer:
its lost 91
Explanation:
mercury is the closest planet to the sun, but its mean temperature is only 67°C. why is this?
Explanation:
Mercury is the closest planet to the sum, but its mean temperature is only 67°C. This is because Mercury has almost no atmosphere to hold in heat and keep the surface warm.
Hope it will help :)❤
Give reasons why christian should avoid corruption
Answer: that Christians should not withdraw from the world, but should actively participate in the ... That is perhaps the reason why there is currently such an ... Investigating the root causes and consequences of corruption may contribute to a more.
Explanation:
What is only found in plant cells??
Cell membrane , nucleus, cell wall , vacuole.
which one !!!
Scavengers are organisms that help clean a habitat by feeding on dead or rotting flesh. They help break down the remains left behind by carnivores. Vultures and maggots (baby flies) are common scavengers.
Decomposers are organisms that break down the remains of dead animals or plants. Many live in or on the soil. Fungi and bacteria are examples of decomposers.
Which of the following is an example of decomposers at work?
a. a fish eating dead seaweed floating in the water
b. a vulture picking apart a dead mouse in the woods
c. a squirrel gnawing at a dead bird on the ground
d. a fungus growing on a rotten tomato, breaking down its skin
Answer:
I think no B
if wrong correct me pls
have a nice day
#Captainpower
좋은 하루 되세요
#캡틴 파워
Answer: B
Explanation:
Vultures and maggots (baby flies) are common scavengers. Decomposers are organisms that break down the remains of dead animals or plants. ... Green plants are called producers because they take energy from sunlight and produce food in which the energy is stored.
An asteroid has a mean radius equal to 17 times that of Earth. Using Kepler's 3rd law find its period. T^2=a^3
Answer:
If T^2 = a^3
T1^2 / T2^2 = a1^3 / a2^3
Or T2^2 = T1^2 * ( a2^3 / a1^3)
Given T1 = 1 yr and a2 / a1 = 17
Then T2^2 = 1 * 17^3
or T2 = 70 yrs
Which statement about the minerals plagioclase feldspar, gypsum, biotite mica, and talc can best be inferred from the chart? (1) These minerals have the same
chemical and physical properties. (2) These minerals have different chemical properties, but they have similar physical properties. (3) These minerals have different physical and chemical properties, but they have identical uses. (4) The physical and chemical properties of these minerals determine how humans use them.
Answer:
(4) The physical and chemical properties of these minerals determine how humans use them.
Explanation:
All the materials and the metals found on earth shows certain characteristics naturally or in their physical state. These physical characteristics can be their look, their structure, their color, strength, melting point, boiling point, density, etc.
And chemical properties of the metals are defined as those characteristics or features of the metals that it exhibits when these metals reacts chemically.
The physical properties as well as the chemical properties distinguishes each metal from each other. These properties determines how people use these metals in their life.
If you were to throw one show with a force of 20 Newtons and the other with a force of 10 Newtons, which would accelerate more? Why?
Answer:
The show with 20 N force will accelerate more than the show with 10 N force, because 20 N force is greater than 10 N force.
Explanation:
From Newton's second law of motion, acceleration is the ratio of applied to mass of the object.
[tex]acceleration = \frac{Force}{mass}[/tex]
Acceleration is directly proportional to an applied force. At a constant mass, acceleration increases with an increase in the applied force.
Therefore, the show with 20 N force will accelerate more than the show with 10 N force, because 20 N force is greater than 10 N force.
An electromagnet is a device that uses an electric current to produce a magnetic field.
Electromagnets are typically composed of a piece of metal wrapped with wire and connected to a battery. The battery provides the electric current, and the loops or coils of wire enhance the magnetic field. The more loops there are, the stronger the magnetic field.
When electric current flows through the electromagnet, the metal core becomes magnetized, so it possesses a north pole and a south pole.
Motors place electromagnets inside of permanent magnets as shown below.
However, motors are designed so that the polarity of the electromagnet constantly flips. That is, the north pole becomes the south pole, and the south pole becomes the north pole, every time the electromagnet turns 180 degrees.
Why is it designed this way?
A.
to conserve the energy in the battery
B.
to constantly polarize the field magnet
C.
so the electromagnet will continuously turn
D.
so the magnetic field will get stronger
The reason why motors are designed so that the polarity of the electromagnet constantly flips.is
C. so the electromagnet will continuously turn
Why is motor designed that wayThe reason motors are designed so that the polarity of the electromagnet constantly flips is to continuously turn the electromagnet. This allows the motor to rotate continuously, rather than becoming stuck in one position.
The flipping of the polarity causes the electromagnet to attract and repel from the permanent magnets, creating a rotating motion.
Therefore, the correct answer is C.
Learn more about motors at:
https://brainly.com/question/18619348
#SPJ1
1. बालू के एक कण की त्रिज्या 1.6 x 10-4मी है। इस कण की त्रिज्या
ऐंग्स्ट्रॉम में होगी
(a) 1.6x106A
तन (b) 1.5x106A
(c) 14x10A
(d)1.2x106A
Answer:
BOIIII english????
Explanation:
The periodic wave in the diagram below has a frequency of 80. hertz.
What is the speed of the wave? (1) 13 m/s (2) 60. m/s (3) 27 m/s (4) 120 m/s
Answer:
hi how are you
2) 5/8
4) 5/8
NO LINKS OR NON USEFUL ANSWERS!!!!!!!! What makes a screw able to hold more or less weight?
Answer:
thread
Explanation:n general, a screw can hold 80-100 pounds. Several factors can impact on the amount of weight the screw can hold. This includes the length of the screw, the type of thread, the quality of the screw, the way it was inserted, and the type of forces that will be acting on it.
Aluminium + hydrochloric acid =
Answer:
Aluminum hydrochloric acid
Explanation:
Aluminum reacts with diluted hydrochloric acid at room temperature. The metal aluminium dissolves in hydrochloric acid, producing aluminum chloride and colorless hydrogen gas. The reaction taking place between aluminium and hydrochloric acid is irreversible. And the final products will not react with each other.
Which is not a way in which life is dependent on photosynthesis?
A.) Organisms breathe in the oxygen
B.) Its sugar is used as a food
C.) Helps cure disease
D.) Helps reduce global warming
Answer:
The answer is A
Explanation:
I have had this question before
hope this helps!! <3
The one that is not a way in which life is dependent on photosynthesis is that helping in cure of diseases. The correct option is C.
What is photosynthesis?Photosynthesis is a technique that plants as well as other lifeforms use to transform light energy into chemical energy that can then be released to fuel the organism's activities via cellular respiration.
Photosynthesis' primary function is to convert solar energy into chemical energy and then store that chemical energy for later use. This process powers the majority of the planet's living systems.
Photosynthesis is essential to all living things because it is the primary source of oxygen in the atmosphere.
Without photosynthetic activity, the carbon cycle would not have been possible, oxygen-requiring life would perish, and plants would perish.
Due to photosynthesis, the organisms breathe in the oxygen, sugar is used as a food, and also helps to lower down global warming.
Thus, the correct option is C.
For more details regarding photosynthesis, visit:
https://brainly.com/question/1388366
#SPJ2
what is the conclusion of coin and feather experiment?
Answer:
So the conclusion is that in presence of air net force acting downward reduces for feather and hence falls slower than coin. But in absence of air resistance, net downward force is just equal to force due to gravity which is same for both coin and feather and hence they fall down at the same rate.