It will be attracted most to your positively charged hair. This is why it will make it stand on end. Unlike charges attract, like charges repel.
Which of the following do all of the small objects in the four categories (dwarf planets, asteroids, comets, and meteoroids) have in common? A) They all orbit the sun, B) They all have icy compositions, C) They are all less than a kilometer in diameter, D) They are all located in the asteroid belt
Answer: A) They all orbit the sun
Explanation:
Dwarf planets are rocky bodies almost round in shape which orbit the Sun. For example- Pluto and Ceres.
Asteroids are irregular shaped and sized rocky bodies which orbit the Sun. Majority of the asteroids are found in between orbits of Mars and Jupiter.
Comets have rocky surface composed of frozen gases. Comets come from outskirts of solar system. These objects also orbit the sun.
Meteoroids are debris of comets and other celestial objects in the solar system. These meteoroids also orbit the Sun.
Thus, the common characteristic of all the given small celestial objects is that they all orbit the Sun.
Is there a bigger planet than the sun
Suppose a vector V makes an angle ϕ with respect to the y axis. Part A What could be the x and y components of the vector V ? Express your answers in terms of the variables V and ϕ separated by a comma.
The variables in the terms of V and ϕ separated by a comma are Vx = v sin phi, Vy = V cos phi
What are vectors?A quantity or phenomenon with independent qualities for both magnitude and direction is called a vector. The term can also refer to a quantity's mathematical or geometrical representation.
The vector V makes an angle with the Y axis, as indicated by the question.
Calculating the x component and y component, which stand for the horizontal and vertical components, is required. Take into consideration a two-dimensional coordinate system with two perpendicular axes, the X and Y axes.
The Y axis and the vector V are at an angle θ. Let's use the symbols for the x and y components, Vx and Vy respectively.
Therefore, the variables are Vx = v sin phi, Vy = V cos phi.
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The speed of a bus increases uniformly from 15 ms per second to 60 ms per second in 20 seconds. calculate 1. the average speed 2. the acceleration 3. the distance travelled during the entire period
Answer:
Part a)
[tex]v_{avg} = 37.5 m/s[/tex]
Part b)
[tex]a = 2.25 m/s^2[/tex]
Part c)
[tex]d = 750 m[/tex]
Explanation:
Part a)
Since we know that bus is moving uniformly from initial speed of 15 m/s to 60 m/s in 20 seconds
So we will have
[tex]v_{avg} = \frac{d}{t}[/tex]
we know that
[tex]d = \frac{v_f + v_i}{2} t[/tex]
so we have
[tex]v_{avg} = \frac{v_f + v_i}{2}[/tex]
[tex]v_{avg} = \frac{15 + 60}{2}[/tex]
[tex]v_{avg} = 37.5 m/s[/tex]
Part b)
As we know that acceleration is rate of change in velocity
so it is given as
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{60 - 15}{20}[/tex]
[tex]a = 2.25 m/s^2[/tex]
Part c)
distance moved by the bus is given as
[tex]d = v_{avg} \times t[/tex]
[tex]d = 37.5 \times 20[/tex]
[tex]d = 750 m[/tex]
A thin, rectangular sheet of metal has mass M and sides of length a and b. Find the moment of inertia of this sheet about an axis that lies in the plane of the plate, passes through the center of the plate, and is parallel to the side with length b.
What is the color of the stars with the highest surface temperature and what is the color of the stars with the lowest surface temperature?
The color of stars with the highest surface temperature is bluish, and the color of stars with the lowest surface temperature is reddish.
The color of a star primarily depends on its surface temperature. Hotter stars emit more energy and tend to appear bluish, while cooler stars emit less energy and appear reddish. This is due to the fact that hotter objects emit more high-energy, short-wavelength light, which corresponds to the blue end of the spectrum. Conversely, cooler objects emit more lower-energy, long-wavelength light, associated with the red end of the visible spectrum. For example, a star with a surface temperature around 10,000 °C will appear blue or bluish-white, while a star with a surface temperature around 3,000 °C will appear red. This correlation between color and temperature is vital for astronomers, as the color index provides a way to measure the temperatures of stars. The color of stars effectively acts as a sort of cosmic thermometer, allowing astronomers to deduce various characteristics of a star including its size, age, and chemical composition.
Describe a time when an illustration would be helpful in everyday activities
How could you increase the power of a wave in a spring? A. Increase the amplitude. B. Increase the frequency. C. Increase the tension on the spring. D. All of the above
The power of a wave measures the amount of energy the wave transmits in per unit time
The correct option that could increase the power of a wave in a spring is option D.
D. All of the above
The reason the selected option is correct is given as follows;
The power of a wave in a string is given by the following equation;
[tex]Wave \ power = \dfrac{1}{2} \cdot \mu \cdot \omega^2 \cdot A^2 \cdot v[/tex]Where;
μ = The string's mass per unit length
ω = The wave's angular frequency
A = The wave amplitude
v = The velocity of propagation of the wave
[tex]v = \sqrt{\dfrac{T}{\mu} }[/tex]
T = Tension in the string
Increasing the power of the wave in a string, can be done by either;
Increasing the wave amplitudeIncreasing the velocity of the wave by increasing the frequency (v = f·λ)The velocity of the wave is increased when the tension is increased, therefore, increasing the tension, increases the power of the wave in a stringTherefore, all the options are correct
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How might you cause an endothermic Chemical change to begin keep going?
Natural selection. Darwin hypothesized that there requisites for natural selection to occur and that there are definite steps to natural selection. Note the two models seen here. Both of the models illustrate an important requisite for natural selection. That is:
A) sexual reproduction must occur.
B) there is survival of the fittest.
C) variation in the population exists.
D) genetic sameness reduces the chances of natural selection.
Answer:c) variation in the population exists
Explanation:
Answer: C) variation in the population exists.
Explanation:
Based on Darwin, the most important requisite for natural selection is the variance in the genetics of the individuals of some species.
These differences, produced by mutations, may have a positive effect or a negative effect in the life of the subjects, where, statistically, the positive mutations will prevail as the species reproduces.
So the right answer would be C, Variation in the population exists.
Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?
Ken lives in an agricultural society where his community engages in farming and animal domestication for subsistence and income. The community is settled, which contrasts with nomadic hunter-gatherer or pastoral societies, and revolves around horticulture or intensive agriculture.
Explanation:Ken lives in an agricultural society. This type of society is rooted in farming and domestication of animals for subsistence and income. With settled communities, Ken's society has shifted from the nomadic lifestyle of hunter-gatherer or pastoral societies to a more stationary form of living where they cultivate land and breed domestic species for food. As agriculture allows for surplus production, it also enables the development of specialized occupations, trade, and the creation of settled villages, which can develop into more complex sociopolitical structures.
In Ken's community, where extensive horticulture or intensive agriculture is practiced, members of the community may be part of a peasant class in their nation-states, working small plots of land within a larger regional economy. Despite the advancements that technology brings to smooth out the harshness of existence, such societies are dependent on their environmental ecosystems, and any changes to them can significantly impact their way of life.
Which factors cause kinetic energy to increase?
increases in mass and decreases in velocity
increases in mass and velocity
decreases in mass and velocity
decreases in mass and increases in velocity
Kinetic energy increases with increases in both mass and velocity, with velocity having a more significant impact due to its squared relationship in the kinetic energy formula KE = 0.5 x m x v².
The factors that cause kinetic energy to increase are an increase in mass and an increase in velocity. From the information given, kinetic energy is proportional to the mass of an object and to the square of its velocity, which is represented by the equation KE = 0.5 times m times v². Therefore, if we double the mass of an object, its kinetic energy would double, and if we double its velocity, its kinetic energy would quadruple, demonstrating a much more significant increase in kinetic energy with an increase in velocity. This principle underscores the profound influence of velocity on kinetic energy variations, elucidating the intricate interplay between mass, velocity, and energy manifestations in physical systems.
a 100 kg object is pulled vertically upwards by a constant force of 4000 N for a distance of 20.0 m. what is the work done by the net force on the object?
I need help on both questions
If the thermal energy of the system increases by 400 J, and 1,100 J of heat were added to the system, how much work did the system do?
A. 1,500 J
B. 700 J
C. 400 J
D. 1,100 J
Answer:
700j
Explanation:
A scientific theory _______.
a. Describes what occurs every time in a given situation
b. Is not a validated bu experimentation
c. Can never be changed
d. Is an explanation for a set of events
student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5N which causes the ball to begin moving what is the accelaration of the ball when it begins to move
Student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N which causes the ball to begin moving than the acceleration of the ball when it begins to move is 200 m/s².
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given in the question student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N then the acceleration is given as,
F = ma
a = F/m
a = 5/0.025
a = 200 m/s²
The acceleration of the ball when it begins to move is 200 m/s².
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Kinetic energy and mass are____ proportional.
Answer:
Kinetic energy and mass are directly proportional.
Explanation:
The kinetic energy of an object is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where
m is the mass of the object
v is the speed of the object
From the equation above, we see that the kinetic energy (K) depends linearly on the mass (m), so kinetic energy and mass are directly proportional to each other.
A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. How many neutrons does it have?
Answer:
19
Explanation:
It's just basic stuff
Calculate the weight(force of gravity) of a 10 kg child.
A. 10 N
B. 98 kg
C. 10 kg
D. 98 N
The weight(force of gravity) of the child is: D. 98 Newton.
Given the following data:
Mass of child = 10 kgWe know that the acceleration due to gravity (a) of an object on planet Earth is equal to 9.8 meter per seconds square.
To calculate the weight(force of gravity) of the child:
Mathematically, the weight(force of gravity) of an object or body is calculated by using the following formula;
[tex]Weight = mg[/tex]
Where:
m represents the mass of an object. g is the acceleration due to gravity.
Substituting the given parameters into the formula, we have;
[tex]Weight = 10[/tex] × [tex]9.8[/tex]
Weight(force of gravity) = 98 Newton
Therefore, the weight(force of gravity) of the child is 98 Newton.
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URGENT!
What makes some collisions elastic and and other inelastic?
A. If the collision involves bouncing, it is elastic.
B. If the collision involves sticking together, it is elastic.
C. If there is no loss of kinetic energy, it is elastic.
D. If there is energy lost in the collision to sound, heat, etc., the collision is elastic.
look at me answering a question from 2017 its 2021 \(^o^\) (/^o^)/
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A bowling ball collides with a pin and pushes the pin toward the right. Which describes the reaction force?
A.The pin pushes the bowling ball toward the right.
B.The pin pushes the bowling ball toward the left.
C.The bowling ball pulls the pin toward the right.
D.The bowling ball pulls the pin toward the left.
Answer:
B.The pin pushes the bowling ball toward the left.
Explanation:
As stated by Newton's third law:
"When any object A exerts a force on another object B, then object B exerts an equal and opposite force on object B". These two forces are called action and reaction.
In this example, the ball is our object A, while the pin is object B. We are told that the ball exerts a force on the pin, toward the right: therefore, the pin must exerts an equal and opposite force on the ball. So this force will be in the opposite direction, therefore toward the left.
Answer:
It’s B
Explanation:
Hope this helps!
URGENT!!
What makes some collisions elastic and others inelastic?
A. If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.
B. If there is no loss of kinetic energy in the collision, it is inelastic.
C. If the collision involves bouncing, it is elastic.
D. If the collision involves sticking together, it is elastic.
To solve this we must be knowing each and every concept related to collisions. Therefore, the correct option is option A among all given options.
What is collisions?Two items collide when they briefly come into touch with one another. To put it another way, a collision is a brief reciprocal encounter between two masses in which the momentum or energy of the masses change.
Total momentum, total energy, and full kinetic energy are all conserved in an elastic collision. The forces engaged in the brief encounter are preserved in nature, therefore the entire mechanical energy also isn't changed into a different energy type. If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.
Therefore, the correct option is option A.
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When you turn on a battery-powered flashlight, you transform
A. heat energy into light and chemical energy.
B. chemical energy into electrical energy and light.
C. heat energy into chemical energy and light.
D. electrical energy and light energy into chemical energy.
Ingrid kicks a football with an initial velocity of 12 m/s at an angle of 45 degrees relative to the ground. The horizontal component of the initial velocity to the nearest tenth is?
Answer:
8.5m/s
Explanation:
Given the initial velocity to be 12m/s at an angle of 45° to the ground. The horizontal component of the velocity can be expressed as U cos (theta) where;
U is the initial velocity of the object
theta is the angle between the initial velocity and the horizontal. Mathematically, Ux = Ucos(theta)
Ux = 12cos45°
Ux = 12×1/√2
Ux = 12×√2/2
Ux = 6√2m/s
Ux = 8.48m/s
Ux = 8.5m/s(to nearest tenth)
Is the momentum of a 0.1 kg Mass moving with a velocity of 5 miles per second West
The momentum for the given mass will be 804.6 kgm/s. Momentum is occurring due to the applied force. Its unit is Kg m/s.
What is momentum?The momentum is defined as the product of mass and the velocity of the body. It is denoted by the letter P. It occurs due to the applied force. Its unit is Kg m/s².
The given data in the problem is;
Mass(m)= 0.1 kg
Velocity(v)=5 miles per second =8046.72 m/sec
Momentum = mass × velocity
P=0.1 × 8046.72 m/sec
P=804.6 kgm/s
Hence, the momentum for the given mass will be 804.6 kgm/s
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Final answer:
Momentum is the product of an object's mass and velocity, calculated using the formula Momentum = mass x velocity. In the scenario provided, a 0.1 kg mass moving at 5 miles per second west has a momentum of -0.5 kg*miles/s west.
Explanation:
Momentum is the product of an object's mass and its velocity. It is a vector quantity, meaning it has both magnitude and direction.
To calculate momentum, you can use the formula: Momentum = mass x velocity.
In the given scenario, the momentum of a 0.1 kg mass moving at 5 miles per second west would be 0.1 kg x (-5 miles/s) = -0.5 kg*miles/s west.
Which simple machine is best used to split apart an object?
a screw
a lever
a wedge
a pulley
Answer:
c) wedge
Explanation:
which of the following best describes gravity
a molecular pull
a description of mass
a fundamental force
a kind of acceleration
Answer:
a fundamental force is the correct answer.
Explanation:
gravity is a fundamental force that attract two objects towards each other.
fundamental forces that work among elementary bodies and that are mediated by more than one particle.
There are four types of fundamental force
strong forceWeak forceelectromagnetic forcegravitational force.Gravity is the weakest force.
a school bus travels 15 kilometers in 0.75 hours. What is the speed of the school bus?
A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
Given in the question there is a school bus travels 15 kilo-meters in 0.75 hours, So, to find the speed of the school bus
Speed = total distance/ time taken
Speed = 15/ 0.75
Speed = 20 Km/hr
A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.
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Final answer:
The speed of the school bus is 20 kilometers per hour.
Explanation:
To calculate the speed of the school bus, we need to divide the distance it traveled by the time it took to travel that distance. In this case, the bus traveled 15 kilometers in 0.75 hours. So:
Speed = Distance / Time = 15 km / 0.75 h = 20 km/h
Therefore, the speed of the school bus is 20 kilometers per hour.
Do 3-7 for me? It is science and i hate doing science hw.