Final answer:
A hard mineral with the same color as its streak is likely a metallic mineral, with examples including hematite and galena. The streak test is performed using an unglazed porcelain plate to reveal the color of the mineral's powder form.
Explanation:
The mineral in question, which is hard and has the same color as its streak, could refer to one of the metallic minerals, as they often have a streak color that is indicative of their actual color. Examples include hematite, with a dark gray on hand-sample but a red-brown streak, or galena, which has a dark gray streak matching its dark gray appearance. To determine the streak color, one can perform a streak test by rubbing the mineral across an unglazed porcelain plate. This test is useful because the powder form of the mineral may show colors that are different from the bulk mineral due to the particle size affecting how light is absorbed and reflected.
Which was an idea used to promote the theory of plate tectonics
A. Mountain ranges linking in England and America
The theory of plate tectonics was promoted by the idea of continents drifting over time, which was proposed by Alfred Wegener. This concept was supported by evidence from fossils and rock formations, eventually leading to the development of the theory of plate tectonics.
Explanation:One idea used to promote the theory of plate tectonics is the concept of continents drifting over time. This idea was first proposed by Alfred Wegener in the early 20th century. He pointed out that the continents appeared to fit together like puzzle pieces, and he used evidence from fossils and rock formations to support his hypothesis of continental drift. Eventually, this idea led to the development of the theory of plate tectonics, which explains how the Earth's crust is divided into several plates that move and interact with each other.
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Today's Apple Mac computers run with the same internal hardware as the Windows-based PC.
(Points : 2)
True
False
I think it true
Help Please..?
A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loading one barrel into the truck?
A:980J
B:19,600J
C :4900J
D :imposible to tell because velocity is not given.,
how can you find the total displacement during the time interval of a graph?
please help totally lost :/
Answer:
Area under v-t graph = total displacement
Explanation:
The area under velocity time graph gives the total displacement of any object. Th attached figure shows a velocity time graph. In which the y axis shows the velocity and x axis shows the time taken.
The velocity is from 0 to 20 m/s and time is from 0 to 15 s. The total displacement is given by the area of region OABC.
So, d = 2 × area of triangle + area of rectangle
[tex]d=2\times \dfrac{1}{2}\times 5\times 20+5\times 20[/tex]
d = 200 m
The total displacement covered by an object in this case is 200 m. Hence, the total displacement during the time interval of a graph can be determined by v-t graph.
Which best describes how heat flows? A. Heat flows from a warmer object to a colder object. B. Heat flows in any direction. C. Heat flows from a colder object to a warmer object. D. All objects transfer to their heat to all other objects.
The statement which best describes how heat flows is that the heat generally flows from a warmer object to a colder object. Therefore, the correct option is A.
The mechanism of heat flow significantly describes the transfer of heat energy or enthalpy from one object to another. It is transferred through the process of conduction, convection, and radiation.
The object that is warmer in appearance may accumulate heat in enough amounts. This leads to an increase in its temperature and energy, While the mechanism of heat transfer generally initiates this warmer object to a colder object by conduction.
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The blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.54 cm, its potential energy is 0.0025 J.
(a) What is the force constant of the spring? (answer is in kN/M)
(b) What compression is required for the spring potential energy to equal 0.0078 J? (answer is in cm),
The force constant of the spring is roughly0.171 kN/ m. The contraction needed for the spring's implicit energy to equal0.0078 J is roughly0.381 cm.
To calculate the force constant of the spring( k), we use the formula for the implicit energy of a compressed or stretched spring, which is U = 1/2 k x2. Rearranging this formula to break for k gives k = 2U/ x2. Substituting U = 0.0025 J and x = 0.54 cm( or0.0054 m) into the formula yields k = ( 2 J)/(0.0054 m) 2. Calculating this, we find k = 171.296 N/ m or roughly0.171 kN/m.
For part( b), when seeking the contraction needed to produce a implicit energy of0.0078 J, we start from the formula U = 1/2 k x2 again. fitting the implicit energy U = 0.0078 J and the preliminarily calculated force constant k = 171.296 N/ m into the formula and working for x delivers x = sqrt(2 extasteriskcentered0.0078 J)/171.296 N/ m). This results in an x value of roughly0.00381 m or0.381 cm.
What is the acceleration of a 24 kg mass pushed by a 6N force?
Which formulas show the relationships between momentum, mass, and velocity? Check all that apply. p = mv p = p = m = p = v = v =
Answer: Option (a) is the correct answer.
Explanation:
Momentum is defined as the ability or tendency of an object to continue moving.
Also, momentum is the product of mass and velocity. It can be shown as follows.
p = m × v
where, p = momentum
m = mass
v = velocity
Thus, we can conclude that out of the given options, the formula p = mv show the relationship between momentum, mass, and velocity.
Answer:
A,D,F
Explanation:
If the man on the left pulls on the object with a force of 500 N and the man on the right pulls on the object with a force of 750 N, what is the net force exerted on the object?
A.
1250 N to the right
B.
1250 N to the left
C.
250 N to the right
D.
250 N to the left
A battery charger is connected to a dead battery and delivers a current of 3.5 a for 4 hours, keeping the voltage across the battery terminals at 16 v in the process. how much energy is delivered to the battery?
The energy delivered to the battery by the charger is calculated using the formula E = P times t, with P = I times V. It turns out to be 806,400 joules.
The question involves calculating the energy delivered to a battery by a battery charger. To find this, we use the formula Energy (E) = Power (P) times Time (t), where Power (P) is the product of the current (I) and the voltage (V). Here, the battery charger delivers a current of 3.5 A for 4 hours (time) and maintains a constant voltage of 16 V. Therefore, we calculate the energy as follows:
Energy (E) = Power (P) times Time (t)
Power (P) = Current (I) times Voltage (V) = 3.5 A times 16 V
Energy (E) = (3.5 A times 16 V) times 4 hours
Energy (E) = 56 W times 4 hours = 224 Wh
Since 1 Wh = 3600 J, Energy (E) = 224 times 3600 J
Energy (E) = 806,400 joules
So, the battery charger delivers 806,400 joules of energy to the battery.
The radio source ________ is located in a place consistent with the center of our galaxy.
The area around a charged object that can exert a force on other charges objects is an electric_____.
The answer is Electric force.
if you look inside the bowl of a shiny metal spoon, your image is upside down. if you look at the outside of the bowl, your image is right side up. explain.
3. Which of the following statements about features on the sun is true?
A.) Prominences look dark in regular photographs.
B.) Solar flares form when prominences connect.
C.) The number of sunspots on the sun's surface is always the same.
D.) Sunspots can greatly increase the solar wind.
Please Help Me Out!
Durante uma corrida de carros, o piloto da escuderia ganhadora percorreu a primeira volta da pista com velocidade media de 310 km/h. o que podemos dizer sobre as velocidades maxima e minima
HELP PLEASE .
Which of the following is an example of transuranium element ?
Samarium
Uranium
Thorium
Curium
Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
Samarium, uranium, and thorium are all elements with atomic numbers less than 92, which is the atomic number of uranium. Curium is the first transuranium element, with an atomic number of 96. It was discovered in 1944 by Glenn T. Seaborg and his colleagues at the University of California, Berkeley.
Curium is a radioactive element that decays into other elements, such as plutonium and barium. It has a variety of applications, including in nuclear weapons and medical research.
The other elements in the question are not transuranium elements. Samarium is an lanthanide element with an atomic number of 62. Uranium is an actinide element with an atomic number of 92. Thorium is an actinide element with an atomic number of 90.
Therefore, Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
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The region around the nucleus occupied by the electrons is called
Orbittal is referred to the region around the nucleus occupied by the electrons.
What is a Nucleus?This can be defined as a small, dense region consisting of protons and neutrons and is usually located at the center of an atom.
The electrons are present around the nucleus in a region which is referred to as orbittal and are actively involved in chemical reactions.
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The net force acting on a 5 kg discus is 50 n. what is the acceleration of the discus
Final answer:
The acceleration of the 5 kg discus is 10 m/s², calculated using Newton's second law of motion.
Explanation:
The acceleration of the 5 kg discus can be found using Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and its acceleration (F = ma). Given the net force (50 N) and the mass of the discus (5 kg), we can rearrange the formula to solve for acceleration (a = F/m).
Now, substituting the given values into the equation, we have:
a = 50 N / 5 kg
After performing the calculation, the acceleration of the discus is:
a = 10 m/s
PLEASE HELP WILL MEDAL !!!
In the water cycle, which state of matter is water vapor?
solid
liquid
gas
plasma
Which best describes the forces identified by Newton’s third law of motion?
equal and acting on different objects
equal and acting on the same object
unequal and acting on different objects
unequal and acting on the same object
Best answer is A: Equal and acting on different objects
Explanation, according to the third law of motion, this is how it works.
I can also confirm that I have tested on this question and got 100% on that test, so this answer has to be correct.
The forces identified by Newton’s third law of motion is best describes equal and acting on different objects.
What is Newton’s third law of motion?If an object exerts a force on another object, then another object must exert a force of equal magnitude and opposite direction back on first object.
Example of Newton’s third law of motion are
A swimmer moves forward by pushing off the side of pool. This way, the wall pushes in opposite direction and giving acceleration.Rockets move forward by expelling gas backward at high velocity. That means, the rocket exerts a large backward force on the gas in the rocket combustion chamber, and the gas thereby exerts a large reaction force forward on the rocket. This reaction force is called thrust.Helicopters create lift by pushing the air downward, therefore facing an upward reaction force. Birds fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air down and backward in order to get lift and forward motion.To learn more about Newton’s third law of motion here
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during a neap tide, which phase could the moon be in? select all that apply
a. new
b. third quarter
c. first quarter
d. full
Answer:
b. third quarter
c. first quarter
Explanation:
Neap tides happen in the third and first quarter of the moon phase, when the moon appears to be half full, this is because of the position of the moon and the gravitational force of the moon attracting the tides along with the gravitational force of the sun, tha causes high tides on new, and full phases, but the third quarter and first quarter, the moon makes a 90º line with the solar gravitational forces, cancelling out both forces making it low tide or neap tide.
You are standing in front of a flat large mirror. As you step 1.0 m farther from the mirror, the distance between you and your image changes by __________.
(Points : 1)
0 m
1.0 m
2.0 m
0.5 m,
The difference in temperature between 100°C and 101°C is _____ the difference between 100K and 101K.
Although objects can go through physical and changes, the amount of matter in those objects remains the same. This is known as the Law of Conservation of Matter. Matter can be broken into smaller pieces, dissolve in liquids, change physical states, and undergo other changes while still conserving its mass. Which pairs of matter demonstrate the law of conservation? * A structure made of building blocks * The blocks of the same structure bundled in a pile with the extra binding material * A snowman * The melted remains of the same snowman * A lump of clay * The same lump broken into three pieces * 1 cup of water and one gram of salt, separated * The same cup of water with two grams of salt mixed in * A lump of clay * An identical lump added to the original * One apple * The same apple cut into slices Submit An
Answer:
A snowman
* The melted remains of the same snowman
A lump of clay
* The same lump broken into three pieces
One apple
* The same apple cut into slices
Explanation:
Which phrase best describes a savanna biome?
Jill pulls on a rope to lift a 12 kg pail out of a well, while the clumsy Jack watches. For a 10.0 meter segment of the lift, she lifts the bucket straight up at constant speed. How much power is required to complete this task in 5.0 seconds?
To lift a 12 kg pail at a constant speed over a distance of 10 meters in 5 seconds, Jill requires a power of 235.44 W. This is calculated using the weight of the pail, the distance lifted, and the time taken.
To determine how much power is required to lift a 12 kg pail straight up at a constant speed over a distance of 10 meters in 5 seconds, we can follow these steps:
1. Calculate the force needed: Since the pail is moving at a constant speed, the force needed to lift it is equal to its weight.
The weight (force due to gravity) is given by:
F = m imes g, where m = 12 kg and g = 9.81 m/s².So, F = 12 kg imes 9.81 m/s² = 117.72 N2. Calculate the work done: Work done in lifting the pail can be calculated as:
W = F imes d, where d = 10 m.So, W = 117.72 N imes 10 m = 1177.2 J3. Calculate the power required: Power is the rate at which work is done. It can be calculated as:
P = W / t, where t = 5 seconds.So, P = 1177.2 J / 5 s = 235.44 WTherefore, the power required to lift the pail at a constant speed over the specified distance in the given time is 235.44 W.
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. exactly 5.0 s later, its speed is 6.0 m/s. what is the puck's average acceleration? what is the coefficient of kinetic friction between the puck and the ice?
a. The puck's average acceleration is equal to -1.2 [tex]m/s^2[/tex].
b. The coefficient of kinetic friction between the puck and the ice is 0.122.
Given the following data:
Initial speed = 12.0 m/sTime = 5.0 seconds.Final speed = 6.0 m/sa. To find the puck's average acceleration:
Mathematically, acceleration is given by the formula;
[tex]Acceleration = \frac{V_f\; - \;V_i}{t}[/tex]
Where:
V is the final velocity. U is the initial velocity. t is the time measured in seconds.[tex]Acceleration = \frac{6\; - \;12}{5}\\\\Acceleration = \frac{-6}{5}[/tex]
Average acceleration = -1.2 [tex]m/s^2[/tex]
b. To find the coefficient of kinetic friction between the puck and the ice:
The frictional force acting between the puck and the ice is given by the formula;
[tex]F = uN = -umg\\\\F = -umg\\\\\frac{F}{m} = -ug[/tex]....equation 1.
But, [tex]a = \frac{F}{m}[/tex] ....equation 2.
We know that acceleration due to gravity (g) of an object is equal to 9.8 meter per seconds square.
[tex]a = -ug\\\\u = \frac{-a}{g}\\\\u = \frac{-(-1.2)}{9.8} \\\\u = \frac{1.2}{9.8}[/tex]
Coefficient of kinetic friction, u = 0.122
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Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s^2
If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position?when released, what will be it’s kinetic energy if it flies past it’s starting position?
Answer:
Explanation:
A one volt change in potential means that the potential electrostatic energy changes by one Joule per Coulomb.
Since you would be pushing the charge against the field, and expend 10 J, the voltage would be 10 Volts higher.
That 10 J will be converted to kinetic energy if the charge flies back to the starting position without friction.
Final answer:
The voltage created when pushing 1 C of charge with 10 J of work is 10 V. Upon release, if no other forces act on the charge, it would have a kinetic energy of 10 J when it flies past its starting position.
Explanation:
When 10 J of work is done to push 1 C of charge against an electric field, the voltage (or electric potential difference) with respect to its starting position can be found using the formula V = W/Q, where V is the voltage, W is the work done, and Q is the charge. Therefore, V = 10 J / 1 C = 10 V.
According to the principle of conservation of energy, if no other forces act on the charge when it is released, all the potential energy will be converted into kinetic energy as it flies past its starting position. Therefore, the kinetic energy (KE) at that point will be equal to the work previously done on the charge, so KE = 10 J.