Answer
Softest mineral-Talc
Hardest mineral- Diamonds
Explaination
Talc is the softest mineral and has a value of 1.
Diamond, the hardest of all minerals, has a value of 10.
Answer:
Softest mineral-Talc
Hardest mineral- Diamonds
Explanation:
What is "Decrease in velocity" please help i need this!! offering 60 points!!!
Answer:
Explanation:
If you go from 60 km/hr or 60 mph and apply your brakes so that you go down to 20 mph or 20 km/hr that is a decrease in velocity. It means you have to slow down because your are in a school zone or a neighborhood zone.
Deceleration can be defined this way.
d = (vf - vi) / t
where vi is bigger than your final velocity. In this case you are slowing down.
What happens when an atom gives up loosely held valence electrons to another atom
Answer:
The number of valence electrons increases to 8 or, the atom gives up loosely held valence electrons.
Explanation:
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1
A ball is projected vertically upwards at t = 0. The
ball is at same height at time 4 s and 8 s. The
maximum height attained by the ball is
(g = 10 m/s2)
(1) 120 m
(2) 80 m
(3) 180 m
(4) 100 m
Answer:
(3) 180 m
Explanation:
y = y₀ + vt − ½ at²
where y is the final height,
y₀ is the initial height,
v is the final velocity,
a is acceleration,
and t is time.
Given y₀ = 0 and a = -10.
y = vt + 5t²
At maximum height, v = 0:
y = 5t²
The ball reaches the same height at 4s and 8s, so the peak is in the middle at 6s.
y = 5(6)²
y = 180
The ball reaches a maximum height of 180 m.
Estimate of the number of stars in our galaxy
Answer:
About 250 billion stars are in the Milky-way Galaxy
Acid rain is a secondary pollutant.
T or F
Answer: True
Explanation:
edgen 2022
Which of the following are appropriate acceleration units?
Answer:
meters per second squared is the appropriate units for acceleration units.
What happens when a rubber balloon is rubbed against wool and gains electrons?
A. A positive charged is induced on the balloon and the wool acquires a negative charge.
B. A negative charged is induced on the balloon and the wool acquires a positive charge.
C. The balloon and the wool both become positively charged.
D. The balloon and the wool both become negatively charged.
Answer:
A negative charged is induced on the balloon and the wool acquires a positive charge.
Explanation:
It gains negative electrons, therefore becoming negatively charged.
As charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Option B. A negative charge is induced on the balloon and the wool acquires a positive charge.
They stick to each other.
It gains negative electrons, therefore becoming negatively charged.
A charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Now that they have opposite charges, the two items attract.
What are 3 facts about electrons?Electrons are found free in nature (free electrons) and bound within atoms. Electrons are responsible for the negatively-charged component of an atom. In an atom, electrons orbit around the positively-charged atomic nucleus. In solids, electrons are the primary means of conducting current.
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what is the fourth planet from the sun and how many planets are there
Answer:
The fourth planet from the sun is Mars. There are 8 planets in our solar system. Its a source of debate of whether or not Pluto is a planet so there is 8 planets and not 9.
Explanation:
The fourth planet from the Sun is Mars.
Mars, commonly known as the "Red Planet," is known for its distinct reddish appearance, which is due to iron oxide, or rust, in its soil. Mars is smaller than Earth and has a thin atmosphere, which means it has lower surface pressure and cooler temperatures. Despite being colder and drier than Earth, Mars has some similarities with our planet, such as the presence of volcanoes.
In addition to its fascinating geological features, Mars has two small moons named Phobos and Deimos. It is also the only planet that has shown evidence of having water in the form of ice, particularly at its polar ice caps and possibly below its surface.
A combination reaction is when two or more _____ combine to form one product. A decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.
Answer:
elements
Explanation:
Answer:
Reactants
Explanation:
A combination reaction is usually defined as a type of chemical reaction in which two or more reactants are fused together to form a single product. For example, The two elements Hydrogen and Chlorine are linked together to form Hydrochloric acid.
This can be written as,
H + Cl -----> HCl (acid)
A decomposition reaction is usually defined as a type of chemical reaction in which a single and complex substance is disintegrated into two or more simple substances. For example, the same above reaction can be disintegrated into-
HCl (acid) ------> H + Cl
When a high-mass main sequence star runs out of both hydrogen and helium in its core, the core begins to fuse
.
When nuclear fusion ends in a high-mass star, the heavy elements formed in the star’s core are released through a
.
Answer:
Supernova
Explanation:
Stars have fixed lifespan. They are born and eventually die when they run out of fuel. An average mass star like sun ends of as white dwarf whereas a high mass star ends up as either neutron star or a blackhole. A high mass star when runs out of fuel first expands to become a supergiant red star and then blows of most of its mass on going supernova. The remnant core is either a neutron star or a blackhole.During supernova, all the heavy elements formed in fusion process is released.
When a high-mass star depletes its hydrogen and helium, it begins carbon fusion, creating heavier elements. After fusion ends, the star releases these elements via a supernova.
Explanation:When a high-mass main sequence star exhausts both its hydrogen and helium fuel, it starts a process known as carbon fusion. During this process, heavier elements like carbon, neon, oxygen, silicon, sulfur, and iron are formed. The elements formed depend on the mass and temperature of the star.
Eventually, when nuclear fusion ends in the star, the heavy elements that have been formed in the star's core are expelled through a catastrophic event known as a supernova. A supernova is a stellar explosion that briefly outshines an entire galaxy, releasing as much energy as the Sun is expected to emit over its whole life.
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What is the focal length of a lens
Answer:
The focal length of a lens is refers to the distance from the center of the lens to the principal foci.
PLEASE HURRY!
how much heat is absorbed by a 72g iron skillet when its temperature rises from 11°c to 23°c?
friction removes energy from objects in motion. Which statement best describes how this works?
a) friction transforms KE into thermal energy
b) friction transfers thermal energy to KE
c) friction transforms TE into PE
d) friction transforms PE into KE
e) friction transfers KE into PE
friction transforms KE into thermal energy (a)
That's why, if it goes on long enough, the moving object actually gets warm.
The correct answer is: a) friction transforms KE into thermal energy.Friction opposes motion by converting kinetic energy into thermal energy. This conversion can be observed through the generation of heat.
Friction is a force that opposes the motion of objects. It transforms the kinetic energy (KE) of an object into thermal energy.This can be observed when you rub your hands together, converting mechanical energy into heat.Thus, the correct answer is: a) friction transforms KE into thermal energy.
2 Points
Which of the following could be vector magnitudes?
A. 30 m/s
B. 15 hours
O
C. 25 milliliters
D. 15 kilometers
SUBMIT
Answer:
A. 30 m/s
D. 15 kilometers
Explanation:
Vector quantities have both magnitude and direction. Among the provided choices, B and C are scalar quantities as they have no direction.
30 m/s is the magnitude for velocity, a derivative of displacement.
15 kilometers is the metric magnitude (10³m) for displacement.
A boat has a mass of 20 kg and will carry 110 kg of passengers across a pool. If 50% of the boat is submerged, what is the total volume of the boat?
Answer:
0.26 m³
Explanation:
There are three forces on the boat: weight of the boat, weight of the passengers, and buoyancy.
∑F = ma
B - mg - Mg = 0
Buoyant force is equal to the weight of the fluid displaced.
ρVg - mg - Mg = 0
ρV - m - M = 0
V = (m + M) / ρ
Given m = 20 kg, M = 110 kg, and ρ = 1000 kg/m³:
V = (20 + 110) / 1000
V = 0.13 m³
Since this is half of the boat's volume, the total volume is 0.26 m³.
The total volume of the boat is 0.0265 cubic meters.
What is Archimedes' principle?Archimedes' principle, which states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.
Here in the Question,
Let's begin by finding the weight of the water displaced by the submerged part of the boat. Since we know that 50% of the boat is submerged, we can assume that the volume of water displaced is equal to half of the volume of the boat.
The weight of the water displaced can be found using the density of water, which is 1000 kg/m³. The formula for the weight of water displaced is:
Weight of water displaced = density of water x volume of water displaced x gravitational acceleration
where gravitational acceleration is 9.8 m/s².
Let V be the total volume of the boat. Then, the volume of water displaced is V/2, since 50% of the boat is submerged.
The weight of the boat is 20 kg, and the weight of the passengers is 110 kg. Therefore, the total weight of the boat and passengers is:
Total weight = weight of boat + weight of passengers
Total weight = 20 kg + 110 kg
Total weight = 130 kg
Now we can use Archimedes' principle to find the buoyant force on the boat:
Buoyant force = weight of water displaced = density of water x V/2 x gravitational acceleration
The buoyant force must be equal to the weight of the boat and passengers for the boat to float, so we have:
Buoyant force = Total weight
Substituting the values we have found, we get:
density of water x V/2 x gravitational acceleration = 130 kg x gravitational acceleration
Simplifying and solving for V, we get:
V = 130 kg / (density of water x 9.8 m/s² x 0.5)
Substituting the value of the density of water, we get:
V = 130 kg / (1000 kg/m³ x 9.8 m/s² x 0.5)
V = 0.0265 m³
Therefore, the total volume of the boat is approximately 0.0265 cubic meters.
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the turning effect of force is called
The answer is torque.
The turning effect of force is torque.
Answer:
The turning effect of force is called Torque
Match the following terms,
1. heat engine
2. heat pump
3. Boiler
4. Thermostat
•a machine that converts the internal energy of a fuel into mechanical energy.
•an appliance that extracts heat energy from one source and deposits it
elsewhere.
•an appliance that controls the maintenance temperature of a heating
system.
•a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or
convection heating systems.
Answer:
1. heat engine ~~ •a machine that converts the internal energy of a fuel into mechanical energy.
2. heat pump ~~ •an appliance that extracts heat energy from one source and deposits it
elsewhere.
3. Boiler ~~ •a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or
convection heating systems.
4. Thermostat ~~ •an appliance that controls the maintenance temperature of a heating
system
Final answer:
Heat engine is a machine converting internal energy to mechanical energy; a heat pump moves heat from cool to warm areas; a boiler heats water with fossil fuel energy; and a thermostat maintains temperature in heating systems.
Explanation:
To answer your question of matching each term with the correct definition:
Heat engine – This is a machine that converts the internal energy of a fuel into mechanical energy. Example devices include gasoline and diesel engines, jet engines, and steam turbines that generate electricity.Heat pump – This is an appliance that extracts heat energy from one source and deposits it elsewhere. This device typically moves heat from a cooler area to a warmer area, working against the natural direction of heat flow.Boiler – This is a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or convection heating systems. It is a crucial part of many heating systems.Thermostat – This is an appliance that controls the maintenance temperature of a heating system. It regulates the heat output by turning the system on and off to maintain a set temperature.What is the primary force that helps suspension bridges use cables to hold their spans up? A. tension force B. resistance force C. normal force D. elastic force E. applied force
Answer:
A. Tension force
Explanation:
These are bridges that use cables to hold the road way up.
The cables in a suspension bridge receive the tension force of the bridge. These cables transmit these forces to the towers supporting the bridge and are compressed into the ground.
Answer:
The correct answer is option A. "tension force".
Explanation:
Suspension bridges, like the Golden Gate Bridge or the Brooklyn Bridge, use tension force as the primary source of force that cables use to hold their spans up. The supporting cables receive the tension forces of the bridge, and this same force passes to the anchorages and into the ground. This equilibrium that the tension force gives among the different elements of the bridge, gives the support to hold the bridge together.
In this experiment, you will use a track, a toy car, and some washers to explore Newton’s first two laws of motion. You will make observations and collect data regarding the motion of these objects. In the space below, write a general scientific question that you will answer by doing this experiment.
Answer:
FORCE= MASS*ACCELERATION
Explanation:
By doing the experiments with track, toy car and some washers we can verify our first two Newton's laws.
When we run on a track or we run this car on the track, we need an external force to run the car and we again need an external force to stop that car. This verifies the law of inertia that a body do not want to change its mode.
And we will also verify that the amount of force applied on the body is directly proportional to the mass of the body and its acceleration.
A relevant scientific question for the experiment would be how Newton's first and second laws of motion affect the toy car's movement and the forces it experiences with varying additional masses (washers). Newton's first law, the law of inertia, dictates the car will remain at rest or continue at a constant speed unless an external force acts upon it. Newton's second law predicts the car's acceleration will be proportional to the force applied to it.
Explanation:A scientific question for the experiment could be: 'How do Newton's first and second laws of motion affect the movement and forces acting on the toy car when varying amounts of washers (increased mass) are added?'
According to Newton's first law of motion, also known as the law of inertia, an object will remain at rest or continue moving at a constant speed in a straight line unless acted upon by an external force. This means the toy car should stay at rest until you apply a force to set it in motion.
Newton's second law says that the change of motion (acceleration) of a body is proportional to the force acting on it and happens in the direction of the force. Thus, when applying different weights (washers), you are applying different forces which should result in different accelerations of the toy car.
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Glands that are responsible for lubricating the skin and minimizing water loss are called
Answer:
your answer would be Sebaceous glands
Explanation:
these glands secrete oil/wax called sebum to lubricate and waterproof your skin. Hope this helps :)
"The correct term for the glands responsible for lubricating the skin and minimizing water loss is sebaceous glands.
The skin has several types of glands, each with a specific function. Sebaceous glands are the glands that produce sebum, an oily substance that lubricates the skin and hair. Sebum helps to form a protective layer on the skin's surface, which serves multiple purposes:
1. It prevents the skin from drying out by reducing water loss through the epidermis, which is the outermost layer of the skin.
2. It provides a barrier against foreign pathogens and substances, helping to protect the skin from infections.
3. It contributes to the skin's flexibility and suppleness.
These glands are located all over the body, except for the palms of the hands and the soles of the feet, and are usually associated with hair follicles. The secretion of sebum is an essential process for maintaining healthy skin and hair.
In summary, sebaceous glands play a crucial role in skin health by secreting sebum, which lubricates and waterproofs the skin, thereby minimizing water loss and protecting against external threats."
Francois places a ring made of an unknown metal into a graduated cylinder.
The water level in the graduated cylinder rises from 10.0 cm to 11.5 cm. He
has already found that the mass of the ring is 16.5 g. What is the density of
the ring?
O A. 1.7 g/cm
O B. 0.09 g/cm3
O C. 11.0 g/cm
O D. 1.4 g/cm3
The density of the ring is calculated by dividing its mass (16.5 g) by its volume (1.5 cm^3). The resulting density is 11.0 g/cm^3.
Explanation:The density of an object can be calculated by dividing its mass by its volume, according to the formula Density = Mass/Volume. In this case, Francois found the mass of the ring is 16.5 g. The volume can be determined by the displacement of water in the graduated cylinder, which is 11.5 cm - 10.0 cm = 1.5 cm3. Now we can calculate the density using the given values: Density = 16.5 g / 1.5 cm3 = 11.0 g/cm3. So, the option C, 11.0 g/cm is the correct answer.
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Convection occurs when thermal energy is transferred by the movement of _______
Answer:
Convection occurs when thermal energy is transferred by the movement of fluid particles.
Explanation:
Transfer of heat energy by the movement of fluid particles is called convection. Convection takes place in liquids and gases due to kinetic energy. When heat is provided to liquids and gases they expand and move faster.
Molecules with higher kinetic energy become less dense and rise up to the surface of liquid, whereas molecules with lower energy move towards the bottom. This up and down movement of molecules causes convection currents in fluids.
Answer:
Convection occurs when thermal energy is transferred by the movement of fluids.
Explanation:
Convection is one of the three forms of heat transfer (conduction, convection and radiation) that transports heat between zones with different temperatures. Convection itself is the transport of heat through the movement of fluid. For example, when heating water in a saucepan, the water in contact with the base of the pan rises, while the water from the surface descends and occupies the place left by the hot one.
The coefficient of static friction between car's tires and a level road is 0.80 If car to be stopped in time of 3.0 sec its speed is
Answer:
23.5 m/s
Explanation:
The velocity of the car in decelerated motion is given by
v = u + at
where
v = 0 is the final velocity
u is the initial velocity
a is the acceleration of the car
t = 3.0 s is the time it takes for the car to stop
The acceleration of the car is given by the frictional force, which is the only force acting on the car along the direction of motion, so:
[tex]ma = -\mu mg\\a = -\mu g = -(0.80)(9.8 m/s^2)=-7.84 m/s^2[/tex]
where
[tex]\mu=0.80[/tex] is the coefficient of friction
Solving the previous equation for u, we find the initial velocity:
[tex]u=v-at=0-(-7.84 m/s^2)(3.0 s)=23.5 m/s[/tex]
What happens when Chlorine reacts with Bromine?
A. Electrons move from the Chlorine atoms to the Bromine atoms.
B. Electrons move from the Bromine atoms to the Chlorine atoms.
C. Electrons are shared between the Chlorine atoms and the Bromine atoms.
D. Electrons become delocalized among the atoms.
Chlorine and bromine would likely share electrons to form a covalent bond, not a common reaction. Answer C is correct, as halogens generally share electrons when bonded together.
Explanation:When chlorine reacts with bromine, the outcome depends on the specific conditions of the reaction, such as the presence of other substances and the reaction environment. However, chlorine and bromine are both halogens, and a reaction between them is not typical because they are both nonmetals with high electronegativity. Chlorine is more electronegative than bromine, but not enough to draw electrons away from bromine to form an ionic bond. Instead, if they were to react directly, they would most likely form a covalent bond where electrons are shared between the atoms. Therefore, the most applicable answer to this particular multiple-choice question would be, "C. Electrons are shared between the Chlorine atoms and the Bromine atoms."
It's important to note that this type of reaction isn't common, and the halogens more typically form compounds with metals, where a metal donates electrons to the halogen, as in the formation of ionic bonds such as sodium chloride (NaCl). An example of such electron transfer is seen when sodium (Na), which has a low ionization potential, reacts with chlorine (Cl), which has a high electron affinity, resulting in the chlorine atom gaining an electron and sodium donating one.
A 110-pound person pulls herself up 4.0 feet. This took her 2.5 seconds. How much power was developed?
0.13 hp
0.32 hp
2.0 hp
3.1 hp
Answer:
0.32 Hp is the answer. right
Answer: Power developed by her is 0.32 hp
Explanation:
Work done , W= Force(F) X Displacement (d) in the direction of force
Thus work done , [tex]W=Fd=110\times 4.0 ft-lbf = 440 ft-lbf[/tex]
Now 1.0 ft-lbf = 1.355 joules of energy
Therefore , work done, W= 440x 1.355 J = 596.2 J
Average Power , [tex]P=\frac{work done(W)}{time (t)}[/tex]
=> [tex]P=\frac{596.2}{2.5} watts = 238.5 watts[/tex]
We know 746 hp = 1.0 watts
=> [tex]P=\frac{238.5}{746} hp=0.32 hp[/tex]
Thus average power developed by her is 0.32 hp
What is the momentum of a 5 kg object that has a velocity of 1.2 m/s? 3.8 kg • m/s 4.2 kg • m/s 6.0 kg • m/s 6.2 kg • m/s
Answer:
Your answer will be 6.0kg•m/s
Explanation:
In the given question all the required details d given. Using these information's a person can easily find the momentum of the object. In the question it is already given that the mass of the object is 5 kg and the velocity at which it is traveling is 1.2 m/s.We know the equation of finding momentum asMomentum = mass * velocity = 5 * 1.2 = 6So the momentum of the object is 6 Newton.
Answer:
Momentum of an object, p = 6 kg-m/s
Explanation:
It is given that,
Mass of an object, m = 5 kg
Velocity of that object, v = 1.2 m/s
We need to find the momentum of an object. It is equal to the product of mass and its velocity. Mathematically, it is given by :
p = m v
[tex]p=5\ kg\times 1.2\ m/s[/tex]
p = 6 kg-m/s
So, the momentum of an object is 6 kg-m/s. Hence, this is the required solution.
A good hypothesis must be which of the following
Answer:
Testable
Explanation:
A good hypothesis must always be testable.
Answer:
Must be testable and falsifiable
In which source of water would a wave travel the fastest? A) ice B)cold C) room temperature D) hot
Answer:hot
Explanation:
Ice don’t move at all. cold makes it move slowly. Room temperature it’s ok it might be kinda fast but hot water moves fastest.
Answer: Option (D) is the correct answer.
Explanation:
In a hot source, molecules will have more kinetic energy. As a result, they tend to move randomly and at a rapid rate from their initial position.
So, when a wave travels through hot source then vibrations caused by it will also move at a faster rate due to high kinetic energy in the molecules of the source.
Whereas in ice or cold source molecules have very less kinetic energy. As a result, these molecules will be held much more closer to each other.
So, when a wave travels through it then it will find difficulty to pass through the molecules as they are held closer to each other due to which there is very less or no vacant space for the wave to pass on from one end to another.
At room temperature, a wave will travel less fast as compared to wave in a hot source.
Thus, we can conclude that in hot source of water would a wave travel the fastest.
battery of 12v is connected two series combination of restisator 3 ohm law 4 ohm law 5 ohm law how much current would flow through 12 ohm law resistance
Answer:
1 A
Explanation:
The total resistance of a circit in series is the added amount of individual resistants which is 3+4+5=12 ohms
According to Ohms's law, V=IR
V=voltage
I=current
R=resistance
12=12I
I=1 A
The current flowing through the 12 ohm resistor is 1 ampere.
Explanation:To find the current flowing through the 12 ohm resistor, we need to first find the equivalent resistance of the series combination of resistors.
The total resistance (Rtotal) is calculated by adding the individual resistances (R1, R2, R3) in the series combination:
Rtotal = R1 + R2 + R3
Substituting the given values:
Rtotal = 3 ohms + 4 ohms + 5 ohms = 12 ohms
Using Ohm's law, we can calculate the current (I) flowing through the 12 ohm resistor:
I = V / Rtotal
Substituting the given voltage (V = 12V):
I = 12V / 12 ohms = 1 ampere (A)
Therefore, the current flowing through the 12 ohm resistor is 1 ampere.
Kinetic energy is the energy an object has as a result of its
Answer:
as a result of its motion
Explanation:
Explanation:
The kinetic energy of an object is given by due to its motion. Mathematically, it is given by :
[tex]E_k=\dfrac{1}{2}\times m\times v^2[/tex]
Where
m = mass of an object
v = velocity
The kinetic energy of an object depends on its mass and the velocity with which it is moving. So, basically kinetic energy of an object depends on its motion.