Explanation:
2 . In a conductor,electric current can flow freely; In an insulator it cannot flow freely
our best data about the surface topography of venus has come from:
The best data about the surface topography of Venus has come from various missions and instruments sent by different space agencies. The first spacecraft to provide information about Venus was NASA's Mariner 2, which made a flyby in 1962.
However, it was the Soviet Venera missions that provided the most detailed information about the planet's surface in the 1970s and 1980s. The Venera probes used radar to map the surface, revealing that Venus has vast volcanic plains, impact craters, and mountain ranges. Later missions, such as NASA's Magellan spacecraft in the 1990s, provided even more detailed maps of Venus' surface topography using advanced radar imaging techniques.
With these missions, scientists have been able to study the geology and morphology of Venus, including its thick atmosphere, which has made it difficult to observe the surface with visible light. Overall, the data collected from these missions has greatly improved our understanding of Venus and its unique topography.
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if a red star and a blue star both have the same size, and both are the same distance from earth, which one looks brighter in the night sky? explain in detail.
In the night sky, the red star appears brighter than the blue star of the same size and distance from Earth.
The perceived brightness of a star depends on its intrinsic luminosity and the sensitivity of our eyes to different colors. Red stars typically have lower surface temperatures compared to blue stars, which affects their luminosity.
Despite having the same size and being at the same distance, the red star emits more light in the visible spectrum, making it appear brighter to our eyes. Additionally, our eyes are more sensitive to the red region of the electromagnetic spectrum compared to the blue region. Therefore, even with the same physical properties, the red star would be visually brighter in the night sky than the blue star.
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if a galaxy is found receding from us at 894 km/sec and it is located at a distance of 12 mpc, what is the age of the universe if the universe is flat?
The age of the universe in a flat universe, based on the given values, is approximately 3.454 × 10^16 seconds or approximately 1.094 billion years.
To calculate the age of the universe based on the observed recession velocity and assuming a flat universe, we can use the Hubble's Law equation:
v = H₀ × d
where:
v is the recession velocity of the galaxy,
H₀ is the Hubble constant, and
d is the distance to the galaxy.
The Hubble constant is the rate at which the universe is expanding and is typically expressed in units of km/s per megaparsec (km/s/Mpc).
Rearranging the equation, we can solve for time (t), which represents the age of the universe:
t = 1 / H₀
Given that the recession velocity (v) is 894 km/s and the distance (d) is 12 Mpc, we can substitute these values into the equation:
t = 1 / (894 km/s / 12 Mpc)
Converting the units to consistent values:
t = 1 / (894 km/s / 3.09 × 10^19 km/Mpc)
Evaluating the expression:
t = 1 / (2.897 × 10^−17 s^−1)
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generate a table of conversions from mph to ft/s. start the mph column at 0 and increment by 5 mph. the last line should contain the value 65 mph. (recall that 1 mi = 5,280 ft.)
Sure, here is a table that shows conversions from mph to ft/s:
mph | ft/s
-----------------
0 | 0
5 | 7.33
10 | 14.67
15 | 22
20 | 29.33
25 | 36.67
30 | 44
35 | 51.33
40 | 58.67
45 | 66
50 | 73.33
55 | 80.67
60 | 88
65 | 95.33
As you can see, the mph column starts at 0 and increments by 5 mph until it reaches 65 mph, which is the last line in the table. The ft/s column shows the corresponding speed in feet per second, based on the conversion factor of 1 mi = 5,280 ft.
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A balloon-powered car rolls across the floor at a speed of 0.711 m/s. How long does it take to cover 8.25 m?
Answer:
Time = 11.60 seconds.
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
\(Speed = \frac{distance}{time}\)
Given the following data;
Speed = 0.711m/s
Distance = 8.25m
To find the time;
Making time the subject of formula, we have;
\(Time = \frac{distance}{speed}\)
Substituting into the equation, we have;
\(Time = \frac{8.25}{0.711}\)
Time = 11.60 secs.
Si se deja caer un carrito de una pista de coches sin friccion y su altura inicial es de 1.4 metros, cual es la velocidad maxima que puede alcanzar el carrito?
Answer:
\(5.241\ \text{m/s}\)
Explanation:
m = Masa del coche
g = Aceleración debida a la gravedad = \(9.81\ \text{m/s}^2\)
h = Altura = \(1.4\ \text{m}\)
v = Velocidad del automóvil en la parte inferior de la pista
Aquí asumimos que el automóvil desciende verticalmente. La energía potencial del automóvil se completará convertida en energía cinética en la parte inferior de la pista ya que no hay pérdida de energía.
\(mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 1.4}\\\Rightarrow v=5.241\ \text{m/s}\)
La velocidad máxima que puede alcanzar el coche es \(5.241\ \text{m/s}\).
ten percent calcofluor white stain is often used in wet mounts of _________.
Ten percent Calcofluor White stain is often used in wet mounts of fungi.
Calcofluor White is a fluorescent dye commonly employed in microbiology for the detection and visualization of fungal elements. It binds to the chitin present in the cell walls of fungi, causing them to emit a bright blue fluorescence when illuminated with ultraviolet light. By adding a ten percent Calcofluor White stain to wet mounts, fungal structures such as hyphae, spores, and yeast cells become more easily distinguishable and identifiable under a fluorescence microscope. This staining technique is particularly useful in diagnosing fungal infections, studying fungal morphology, and conducting research on fungal ecology.
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What happens to the acceleration due to gravity as you move farther away from the center of the earth?
Answer:
there less and less gravity while your going farther and farther
The bryophytes are called amphibian plants. Why
Answer:
The bryophytes are called amphibian plants because of their alternation of generation
Explanation:
Their most dominant generation is the Gametophyte.
male Gametophyte are called antheridium
female Gametophyte are called archegonium
if you were to walk at a constant speed 20m/s for 30 seconds, how far would you walk?
Answer:
600m
Explanation:
30×20 at a constant speed is 600m.
A 0.70 kg ball is moving horizontally at 5.7 m/s when it strikes a vertical wall and rebounds with speed 2.7 m/s. What is the magnitude of the change in its linear momentum
The magnitude of the change in linear momentum of the ball is 6.36 kg·m/s.
The change in linear momentum can be calculated using the formula:
Change in momentum = Final momentum - Initial momentum.
Since momentum is a vector quantity, we need to consider both magnitude and direction. In this case, the ball's initial momentum is given by the product of its mass (0.70 kg) and initial velocity (5.7 m/s), while the final momentum is given by the product of the same mass (0.70 kg) and final velocity (2.7 m/s).
Initial momentum = (0.70 kg) × (5.7 m/s) = 3.99 kg·m/s,
Final momentum = (0.70 kg) × (2.7 m/s) = 1.89 kg·m/s.
Therefore, the change in momentum is:
Change in momentum = 1.89 kg·m/s - 3.99 kg·m/s = -2.1 kg·m/s.
Taking the magnitude of the change in momentum gives:
Magnitude of change in momentum = | -2.1 kg·m/s | = 2.1 kg·m/s.
Hence, the magnitude of the change in linear momentum is 2.1 kg·m/s.
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What type of Psychologist was B.F. Skinner?
Answer:
Behaviorist
Explanation:
BF skinner was big on behaviorism and produced massive amounts of support for operant conditionining. He literally had a Skinner box where he did experiments with animals regarding conditionining .
When kayla stands on her trampoline, it sags by 0. 23 m. Now she starts bouncing. How much time elapses between the instant when she first lands on the trampoline's surface and when she passes the same point on the way up?
Kayla stands on her trampoline, it sags by 0.23 m. Now she starts bouncing, it takes approximately 1.89 seconds for Kayla to pass the same point on the trampoline's surface after bouncing up from it.
Let's assume that Kayla's motion can be modeled by simple harmonic motion. In this case, the time elapsed between successive passages through the same point is given by
T = 2π√(m/k)
Where m is the mass of the object and k is the spring constant of the trampoline.
Assuming Kayla has a mass of 50 kg, we can estimate the spring constant of the trampoline using Hooke's Law
F = -kx
Where F is the force applied by the trampoline, x is the displacement from equilibrium, and k is the spring constant. Since the trampoline sags by 0.23 m when Kayla stands on it, the force applied by the trampoline can be estimated as
F = mg + kx = (50 kg)(9.81 m/\(s^{2}\)) + k(0.23 m)
Where g is the acceleration due to gravity. Solving for k, we get
k = (mg + F)/x = [(50 kg)(9.81 m/\(s^{2}\)) + (50 N)]/0.23 m ≈ 2.61 × \(10^{3}\) N/m
Substituting this value into the equation for the period of simple harmonic motion, we get
T = 2π√(m/k) = 2π√(50 kg)/(2.61 × \(10^{3}\) N/m) ≈ 1.89 s
Therefore, it takes approximately 1.89 seconds for Kayla to pass the same point on the trampoline's surface after bouncing up from it.
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Which of the following atmospheric conditions are needed to create the winds?
Answer:
Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.
puck 1 is moving 10 m/s to the left and puck 2 is moving 8 m/s to the right. they have the same mass, m.
If the two pucks, which have the same mass, are moving towards each other, the speed and direction of their movements can be used to calculate the final velocity of both pucks.The law of conservation of momentum states that the momentum of an isolated system remains constant if no external forces act on it.
The momentum before the collision is equal to the momentum after the collision in an isolated system.Considering the given values, if Puck 1 is moving to the left at 10 m/s and Puck 2 is moving to the right at 8 m/s, their velocities are opposite. Therefore, they are moving towards each other.When two pucks with the same mass collide, their velocities and momenta are conserved. If both pucks stick together after the collision, their final velocity can be calculated using the following equation:m1u1+m2u2=(m1+m2)vwhere m1, u1, m2, and u2 are the masses and initial velocities of the pucks, and v is their final velocity.
The final velocity of the combined pucks can be found by dividing the total momentum by their combined mass, which is given by:v = (m1u1 + m2u2) / (m1 + m2)In this case, the momentum of Puck 1 is:momentum1 = m x v1where v1 = -10 m/s (because Puck 1 is moving to the left)Similarly, the momentum of Puck 2 is:momentum2 = m x v2where v2 = 8 m/s (because Puck 2 is moving to the right)
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Which statement accurately describes mass-energy equivalence?
O It includes the idea that mass is a measure of the energy within an object.
O It states that mass-energy can be created or destroyed.
O It can be represented using the formula E = m²c.
O It states that all energy in the universe will be converted to mass.
The statement that describes the mass-energy equivalence is that mass-energy can be created or destroyed. Thus, option B is correct.
The mass-energy equivalence gives the relation between mass and energy in the rest frame. This relation was given by Albert Einstein. Energy and mass are directly proportional to each other. Energy can be converted into mass and the mass of the body is converted into energy. Thus, the mass and energy can either be created or destroyed.
The mass-energy equivalence, E = mc², where E is the energy, m is the mass and c is the speed of light. Thus, the mass-energy equivalence states that mass energy can be created or destroyed.
Thus, the ideal solution is option B.
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Shakib says that 25 meters per second is a velocity. Vania says that 25 meters per second is a speed. Who do you agree with?
Vania is correct in her saying that 25 meters per second is speed as in 25 meter per seconds nothing represents the direction in which the speed is pointing.
What is speed?Speed is a physical quantity that represents the change in distance per unit time it is a scalar quantity and its SI unit is meter per second. Speed only has magnitude but does not have direction.
What is velocity?Velocity is a physical quantity that represents the change in displacement per unit time it is electric quantity and its SI unit is meter per second. Velocity has both magnitude and direction.
Given:
The physical quantity is 25 meters per second.
According to the question Shakib points out that 25 meters per second is velocity, but Shakib is wrong in saying so as in 25 meters per second nothing represents the direction of this quantity.
Here from the given data we can only know the magnitude of the physical quantity but not wear it is pointing towards to.
On the other hand one ya says that 25 m per second is a physical quantity that represents speed and her reasoning is that 25 m per second gives the magnitude as well as the SI units of speed and do not point out in a particular direction therefore the quantity must be speed.
Hence, Vania is correct in her saying that 25 meters per second is speed as in 25 meter per seconds nothing represents the direction in which the speed is pointing.
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which type of friction prevents a object from moving
Answer:
The force of Static Friction
Explanation:
The friction that prevents an object from actually moving (starting to slide) is the force of Static Friction
A force of 6.0 N acts on a 4.0 Kg object for 10.0s. What is the object's change in momentum?
Answer:
60 Ns
Explanation:
change in momentum = Fxt
6*10
60 Ns
A force of 6.0 N acts on a 4.0 Kg object for 10.0 s. The object's change in momentum is 60 kg-m/sec.
What is force?A force is an effect that can alter an object's motion according to physics. 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.
change in momentum = force . time
change in momentum = 6 . 10 = 60
A force of 6.0 N acts on a 4.0 Kg object for 10.0 s. The object's change in momentum is 60 kg-m/sec.
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If an object has a fast velocity, the dots on a ticker tape diagram will be _____.
very long
far apart
very short
close together
Answer:
If an object has a fast velocity, the dots on a ticker tape diagram will be far apart.
Use the drop-down menu to complete the statement.
Increasing the amount of current that flows through a wire________ the strength of an electromagnet.
Answer:
increases
Explanation:
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Increasing the amount of current that flows through a wire increases the strength of an electromagnet.
What is an electromagnet?An electromagnet is a type of magnet that is created by running an electrical current through a coil of wire. Unlike permanent magnets, which have a fixed magnetic field that cannot be adjusted, the magnetic field of an electromagnet can be turned on and off or adjusted by controlling the amount of current flowing through the coil.
The strength of an electromagnet depends on several factors, including the number of coils in the wire, the amount of current flowing through the wire, and the type of core material used in the coil. Electromagnets are widely used in various applications, such as in electric motors, generators, relays, MRI machines, and particle accelerators.
One of the advantages of electromagnets is that their magnetic field can be easily controlled by adjusting the amount of current flowing through the wire. This makes them useful in applications where the magnetic field needs to be turned on and off, or where a variable magnetic field is required.
Another advantage of electromagnets is that they can be designed to be much stronger than permanent magnets. This is because the strength of an electromagnet is directly proportional to the amount of current flowing through the coil, which can be increased or decreased as needed.
Here in this question,
This happens because an electromagnet is created when an electric current flows through a wire, generating a magnetic field around the wire. The strength of the magnetic field depends on the amount of current flowing through the wire.
When more current flows through the wire, the magnetic field around the wire becomes stronger. This is because the magnetic field is directly proportional to the current flowing through the wire, as well as the number of loops of wire in the coil.
Therefore, increasing the current flowing through a wire in an electromagnet will increase the strength of the magnetic field, resulting in a stronger electromagnet.
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illustrate a body of mass 5.0kg pulled by horizontal force F . if the body accelerates 2.0ms² and experience a frictional force of 5N
a. calculate the netforce
b. magnitude of force
c. coefficient of kinetic friction
Explanation:
a. Net force is mass times acceleration (Newton's second law).
∑F = ma
∑F = (5.0 kg) (2.0 m/s²)
∑F = 10 N
b. The net force is the sum of the individual forces.
10 N = F − 5 N
F = 15 N
c. Friction force here is mgμ.
mgμ = 5 N
(5.0 kg) (10 m/s) μ = 5 N
μ = 0.1
What is density meaning
Answer:
Density is defined as how tightly or loosely packed a substance is, or to the number of things or people in a certain area.
Explanation:
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How much force (in Newtons) does a baseball pitcher have to exert on a 250g baseball to make it accelerate to 50 m/s the
Instant that it leaves his hand?
Answer:
Force = 12.5 Newton
Explanation:
Given the following data;
Mass = 250 g to kilograms = 250/1000 = 0.25 kg
Acceleration = 50 m/s²
To find the force;
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
\( Acceleration = \frac {Net \; force}{mass} \)
Making force the subject of formula, we have;
\( Force = mass * acceleration \)
Substituting into the formula, we have
\( Force = 0.25 * 50 \)
Force = 12.5 Newton
Before Collision:
2,000 kg 4 m/s 4,000kg 0 m/s
After collision: 2,000 kg + 4,000kg Vt = ?
I will give Brainliest to the first person. Please show work
Answer:
4/3 m/s
Explanation:
Assuming momentum is conserved, the sum of products of mass and speed before the collision is the same as after:
(2000 kg)(4 m/s) +(4000 kg)(0 m/s) = (2000 +4000 kg)(Vt)
Vt = (8000 kg·m/s)/(6000 kg) = 4/3 m/s
The speed of the combined objects after the collision is 4/3 m/s.
14) A heater is rated at 495W and connected to a 110V supply calculate the
current following through the element? *
I = 4.5 A
Explanation:
P = VI ---> I = P/V
I = (495 W)/(110 V)
= 4.5 A
during the 5.7 min a 5.4 a current is set up in a wire, how many (a) coulombs and (b) electrons pass through any cross section of the wire's width?
a. The amount of coulombs pass through any cross-section of the wire's width is
b. The amount of electrons during the 5.7 min a current is set up on a wire is
To calculate the coulombs, we use the formula:
Charge (Q) = Current (I) × Time (t).
Time should be in seconds, so we'll convert minutes to seconds:
5.7 minutes * 60 = 342 seconds
Now, calculate the charge:
Q = 5.4 A × 342 s = 1846.8 C
So, 1846.8 coulombs pass through any cross-section of the wire's width.
To calculate the number of electrons, we use the formula:
Number of electrons (N) = Charge (Q) / Elementary charge (e)
where e ≈ 1.6 × 10⁻¹⁹ C.
Now, calculate the number of electrons:
N = 1846.8 C / 1.6 × 10⁻¹⁹ C
≈ 1.154 × 10²² electrons.
So, approximately 1.154 × 10²² electrons pass through any cross-section of the wire's width.
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If a car has a velocity of 8 m/s and travels for 60 seconds, what was the displacement of the car?
Answer:
68
Explanation:
now it
Carlos listed some advantages and disadvantages of using nonrenewable resources. Which best describes Carlos's error? Coal is not plentiful anywhere. Coal generates very little energy. Ores do not make many useful products. Ores must be processed.
Answer:
This question is incomplete as it lacks the table that shows the advantages and disadvantages of the two mentioned nonrenewable source of energy (coal and ore). However, the question can be answered based on general understanding.
The answer is D. Ores must be processed.
Explanation:
Energy can be of two major sources namely: renewable and nonrenewable sources. Based on the mentioned area in this question, NONRENEWABLE SOURCES OF ENERGY are those sources of energy that cannot be replenished or replaced when exhausted. They are utilized faster than they form. Examples of nonrenewable sources of energy are coal, ores, fuel etc.
According to this question, Carlos listed some advantages and disadvantages of using nonrenewable resources. However, among the listed disadvantages, Carlo's error is that he included that: ORES MUST Be PROCESSED.
Ores are rock materials that contain metals, which are extracted and purified in a series of processing techniques. Hence, ORES NEED PROCESSING making Carlo's claim erroneous.
Answer:
Carlos listed some advantages and disadvantages of using nonrenewable resources.
Which best describes Carlos’s error?
Coal is not plentiful anywhere.
Coal generates very little energy.
Ores do not make many useful products.
Ores must be processed.
Explanation:
the answer is DTrue or false and justify your answer. the coarse focus knob should be used with scanning objective, low power objective g
False. The coarse focus knob should not be used with the scanning objective or low power objective.
The coarse focus knob is used to make large adjustments to the focus when using high power objectives. When using the scanning objective or low power objective, it is important to use the fine focus knob instead. The fine focus knob allows for small, precise adjustments to the focus, which is necessary for obtaining a clear image at these lower magnifications. Using the coarse focus knob with the scanning objective or low power objective may result in the specimen being brought into focus too quickly or too forcefully, potentially causing damage or distortion to the sample.
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