Answer:
at T = 0ºC the change of state is from the solid state to the gaseous state
Explanation:
In this exercise we are asked about the changes of state, from the data we will assume that the material is water.
Water can exist in three solid states, liquid and gas, in a graph of pressure ℗ against temperature (T) there is a point called triple at T = 0.01ºC, below this point the curve has two states at high pressure solid and low pressure gas.
As a result of the previous ones at T = 0ºC the change of state is from the solid state to the gaseous state
HELPP!!!
1)Explain how a diode could be used to convert a.c. to d.c., and suggest one disadvantage of this.
2) Some energy is always transferred to the surroundings when a current flows through a wire.
a) How is this energy transferred?
b) Is this energy always wasted energy? Explain your answer.
3) You can induce an electric current in a wire by moving a magnet relative to the coil.
A) Describe two different ways in which you can increase the size of the induced current.
B) Describe how you can reverse the direction of the induced current.
Try to split the questions for easy access
What is the net force on the block shown above?
50 N Up
50 N Down
0 N
5 N Down
Answer:
50 N UP
Explanation:
[tex]F_{g} = 150[/tex]
to
[tex]F_{n} = 200[/tex]
Is adding 50 which means you are going up.
Hope this helped!
Have a supercalifragilisticexpialidocious day!
Particulate Motion Unit Test Part 2
1. A gas leak where methane gas combines with oxygen in the air can start a fire, releasing its energy at ignition temperature.
What does the ignition have to do with this chemical reaction?
(1 point)
The ignition provides the energy to break the bonds in molecules and start the reaction.
The ignition adds more atoms to increase its energy during the reaction.
The ignition targets methane gas only and releases oxygen before the fire.
The ignition forces atoms to combine and start a reaction.
2.
Particulate Motion Unit Test
10 of 16Items
Item 10
Gasoline has various chemicals that contain large amounts of chemical potential energy that is released when burned in a car engine.
What happens to the energy produced by burning gasoline in a car engine?
(1 point)
The energy multiplies to keep the engine running.
Some of the energy is lost as heat.
None of the energy is transformed but is sustained as work to run the engine.
The energy released is less than the energy absorbed by the molecules.
3. The reaction between methane gas and oxygen to produce carbon dioxide and water is an exothermic process. Which statement describes the energy in the system?(1 point)
The chemical energy of the reactants is greater than the chemical energy of the products. Energy is absorbed from the surroundings.
The chemical energy of the reactants is greater than the chemical energy of the products. Energy is released to the surroundings.
The chemical energy of the reactants is less than the chemical energy of the products. Energy is released to the surroundings.
The chemical energy of the reactants is less than the chemical energy of the products. Energy is absorbed from the surroundings.
4. How does the energy in the light of the aurora borealis compare to the energy as an excited electron returns to its original energy level?(1 point)
half of the energy
one-third of the energy
equal to
twice the energy
5. A solar flare causes the sun to release a large number of particles along with excess amounts of electromagnetic radiation. Which helps prevent this radiation from harming Earth’s living organisms?(1 point)
Earth’s magnetic field absorbs most of this radiation.
Earth’s magnetic field deflects most of this radiation.
Satellites directly deflect most of this radiation.
Satellites indirectly absorb most of this radiation.
6. Several energy transfers occur during the process of the aurora borealis. During which transfer is the energy the greatest?(1 point)
Energy is the same at each step.
Electrons from the sun transfer energy to atoms in the atmosphere.
Electrons fall and release energy as light.
Electrons in the atoms jump to a higher energy level.
7. Develop a model and use it to explain in 3–4 sentences why a person feels cold when rubbing alcohol is applied to skin. (4 points)
8. Using the concepts of macroscopic and molecular scales of energy, describe in 1–2 sentences how the heating element of a toaster works.(2 points)
Explanation:
The ignition provides the energy to break the bonds in molecules and start the reactionThe energy multiplies to keep the engine runningThe chemical energy of the reactants is greater than the chemical energy of the products. Energy is released to the surroundings.twice the energyEarth’s magnetic field deflects most of this radiation.Electrons in the atoms jump to a higher energy level.it is because alcohol i.look on photo. look it upA large pendulum swings in the lobby of the United Nations building in New York City. The pendulum has a 91-kg gold-plated bob and a length of 22.9 m. Assume g = 9.81 m/s2.
Part A
How much time does it take for the bob to swing from its maximum displacement to its equilibrium position?
Express your answer to three significant figures and include the appropriate units.
Answer:
t = 2.40 s
Explanation:
It just told me
A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?
Answer:
17.6 m/s²
Explanation:
Given:
[tex]v_{f}[/tex] = 90 m/s (final velocity)
[tex]v_{i}[/tex] = 2 m/s (initial velocity)
Δt = 5s (change in time)
The formula for acceleration is:
[tex]a_{avg}[/tex] = Δv / Δt
We can find Δv by doing
Δv = [tex]v_{f}[/tex] - [tex]v_{i}[/tex]
Replace the values
Δv = 90m/s - 2m/s
Δv= 88m/s
Using the equation from earlier, we can find the acceleration by dividing the average velocity by time.
[tex]a_{avg}[/tex] = Δv / Δt
[tex]a_{avg}[/tex] = [tex]\frac{88m/s}{5/s}[/tex]
acceleration = 17.6 [tex]m/s^{2}[/tex]
What is the correct definition of a hypothesis
Answer:
Hypothesis is simply a theory given on something which may be correct or not.
Particulate Motion Unit Test
1. There are two pieces of copper. Piece A is at 70 degrees, while piece B is at 150 degrees. Which piece has more thermal energy? (1 point)
Piece A, because its particles move slower
Piece B, because its particles move faster
Piece A, because its particles move faster
Piece B, because its particles move slower
2. The electrons in the copper atoms in a wire start to move when an electric potential difference is introduced. Which statement about this situation is true?(1 point)
The macroscopic movement of the electrons creates a microscopic flow of electricity.
The macroscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a microscopic flow of electricity.
3. Which statement describes the gravitational energy and energy stored in a magnetic field when objects are drawn close to each other?(1 point)
Both gravitational energy and energy stored in a magnetic field attract.
Both gravitational energy and energy stored in a magnetic field repel.
Gravitational energy attracts; energy stored in a magnetic field attracts or repels.
Gravitational energy attracts; energy stored in a magnetic field repels.
4. A scientist is heating a piece of metal and measuring its temperature. She observes that the temperature of the metal is rapidly increasing. Which statement is correct about the thermal energy of the metal? (1 point)
Thermal energy will increase for as long as temperature is increasing.
Thermal energy will increase for as long as the metal is in solid state.
Thermal energy will increase for as long as the metal is absorbing heat energy.
Thermal energy will increase for as long as the potential energy is zero.
5. A student places a piece of ice inside a glass beaker at room temperature and heats them until they both come to 70°C. Which statement is correct about the energies of the ice and beaker? (1 point)
The thermal energy of the beaker has increased more than the thermal energy of the ice.
The thermal energy of the ice has increased more than the thermal energy of the beaker.
The potential energy of both the ice and beaker have increased the same amount.
The kinetic energy of both the ice and beaker have increased the same amount.
6. Which energy types are both examples of energy on a macroscopic scale?(1 point)
chemical energy and gravitational potential energy
thermal energy and spring potential energy
gravitational potential energy and kinetic energy
kinetic energy and thermal energy
7. A high diver steps off the diving platform and begins falling toward the pool of water below. Which statement about this situation is correct?(1 point)
The amount of energy that is transferred to thermal energy due to friction will be greater at the the top of the fall than at the bottom of the fall.
The gravitational potential energy of the diver decreases as it changes to kinetic energy.
The kinetic energy of the diver decreases as the diver approaches the water.
The gravitational potential energy of the diver increases because of the change in thermal energy due to friction.
8. For a system that contains a rock falling through the air, which situation is always true?(1 point)
The total potential energy of the system is conserved.
The total kinetic energy of the system is conserved.
The total mechanical energy of the system is conserved.
The total energy of the system is conserved.
Answer:
1. piece b because it’s particles move faster.
2. the microscopic movement of the electrons creates a macroscopic flow of electricity.
3. gravitational energy attracts; energy stored in a magnetic field attracts or repels.
4. thermal energy will increase for as long as the metal is absorbing heat energy.
5. the thermal energy of the ice has increased more than the thermal energy of the beaker.
6. gravitational potential energy and kinetic energy
7. the gravitational potential energy of the river decreases as it changes to kinetic energy
8. the total energy of the system is conserved.
Explanation:
just took the test; these are all correct!
For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.
The piece that has a greater thermal energy is the piece that is at higher temperature because Piece B has particles that move faster. The statement that is true regarding electron movement in a copper wire is that; "the microscopic movement of the electrons creates a macroscopic flow of electricity."The energy stored in a magnetic field is related to the gravitational energy by the statement; "gravitational energy attracts; energy stored in a magnetic field attracts or repels."The statement that is correct about the metal whose temperature is increasing rapidly is; "thermal energy will increase for as long as temperature is increasing."The statement that is true about the ice inside a glass beaker is that; "the kinetic energy of both the ice and beaker have increased the same amount."The energy types that are both examples of energy on a macroscopic scale are chemical energy and gravitational potential energy.As the diver steps off the diving platform and begins falling toward the pool of water below, the gravitational potential energy of the diver decreases as it changes to kinetic energy.For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.Learn more about mechanical energy: https://brainly.com/question/15025401
Sergio wants to begin a sensible weight loss program. Along with healthy nutrition which fitness product would benefit him the most in this weight loss goal?
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
Analyzing the information and the options, the fitness product that would most assist Sergio in reaching his weight loss goals would be the pair of comfortable sports shoes, which he could use to do running exercises.
For beginning practitioners it is ideal to start exercising with short 30-minute walks until the body adapts and you gain physical conditioning and endurance.
Running has the advantage of being an excellent exercise that can be practiced anywhere, and helps in the production of dopamine, which produces a feeling of well-being and also helps in reducing hunger, in addition to working and strengthening various muscle groups in the body, activate blood circulation, decrease anxiety, improve cholesterol levels, control blood pressure, etc.
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
A spring with a spring constant of 400 n / M has a mass hung on it so it stretches 8 cm. calculate how much mass the spring is supporting.
Answer:
3.3kg
Explanation:
Given parameters:
Spring constant = 400N/m
Extension = 8cm = 0.08m
Unknown:
Amount of mass the spring is supporting = ?
Solution:
To solve this problem:
F = kE
F is the force
k is the spring constant
E is the extension
So;
F = 400 x 0.08 = 32N
Mass;
Force = mass x acceleration due to gravity
32 = mass x 9.8
Mass = 3.3kg
The mass the spring is supporting is 3.27 Kg.
We'll begin by calculating the force acting on the spring.
Spring constant (K) = 400 N/mExtension (e) = 8cm = 8 / 100 = 0.08 mForce (F) =?F = Ke
F = 400 × 0.08
F = 32 N
Finally, we shall determine the mass. This can be obtained as follow:
Force (F) = 32 NAcceleration due to gravity (g) = 9.8 m/s²Mass (m) =?m = F / g
m = 32 / 9.8
m = 3.27 Kg
Therefore, the mass the spring is supporting is 3.27 Kg
Learn more about spring constant:
https://brainly.com/question/13511965
Which of the following can break solid rock
I would think the answer would be c
Help! will give brainliest!
Answer:
I would say increasing the balls kinetic energy
Explanation:
Because she is moving the ball and increasing kinetic energy
A diagram is provided.What is the volume of the block of metal?
Answer:
You need to add a picture:)
In a binary ionic compound, the electrons are
Answer:
Transferred from one atom to another
Explanation:
In a binary ionic compound, the electrons are transferred from one atom to another, thus forming positive and negative charges on the respective atoms involved, and thereby creating electrostatic forces which thus form the ionic bond.
Answer:transfered from the metal to the nonmetal
Explanation:i took the quiz:)
An object that is 10 m above the ground, posesses 2.000 J of gravitational potential energy. What is the object's mass?
Answer:
20kilograms
Explanation:
GPE = MGH
2000 = M × 10m/s2 × 10
100m= 2000
m = 20kg ( Answer)
A satellite is orbiting the Earth. If the satellite was placed in an orbit at twice the original distance,
what would happen to the force of gravity? By how much would the gravitational force increase or
decrease?
teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?
A laser beam from Earth is reflected by a mirror placed on the Moon. If the speed of the beam is 3.00 x 108 m / s and the distance from Earth to the Moon is 3.81 x 108 m, how long in seconds will the laser beam take to return to its starting point?
Answer:
1.27seconds
Explanation:
Speed = 324 m/s , Distance = 411.48m
Time = Distance/Speed
Time = 411.48/324 seconds
Time = 1.27seconds ( Ans)
If you were to look at grains of table salt with a magnifying glass, you would see that each grain is a little cube. Why are salt grains cubical?
Answer:
All extended structure compounds form cubes. Sodium and chlorine atoms both have cubical shapes. In the extended structure of NaCI, atoms are arranged in a cubical pattern
Please answer the question for gravitational field attached in the image.
We are given:
Radius of Venus= 6 * 10⁶ m
Height above the planet's ground = 9.4 * 10⁶ m
Mass of Venus = 4.867 * 10²⁴ kg
Finding the Gravitational Field:
We first need to calculate the distance between the center of masses
Distance between center of masses:
Since the point is above the surface of Venus, the radius of Venus and the height will add
Distance between the center of masses = 9.4*10⁶ + 6 * 10⁶
Distance (r) = 15.4 * 10⁶ m
Now back to Gravitational field!
We know the formula for Gravitational Field:
g = GM / r² [where g is the gravitational field, M is the mass of the planet, r is the distance between the center of masses and G is the gravitational constant]
plugging the known values in the formula:
g = (6.67 * 10⁻¹¹ * 4.867 * 10²⁴) / (15.4*10⁶)² [G = 6.67*10⁻¹¹ Nm²/kg²]
g = (32.46 * 10¹³) / (237 * 10¹²)
g = (32.46 * 10¹³) / (23.7 * 10¹³)
g = 32.46/23.7 [the 10¹³ got cancelled out]
g = 1.367 N/kg² (or m/s²)
A rocket burns fuel as it shoots into the sky. What happens to the mass and volume of the rocket?
Answer:
mass goes down volume remains the same
Force is a push or pull that causes an object to change speed change direction or to change ___ or _____.
Answer:
acceleration or velocity
Explanation:
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
Negative charges can move from one insulator to another.
True
False
Answer:
True
Explanation:
Because in atom the negative charge become lose or gain.
A 57 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.1 m/s. The acceleration of gravity is 9.8 m/s 2 . Find her altitude as she crosses the bar. Neglect air resistance, as well as any energy absorbed by the pole. Answer in units of m.
Answer:
Her altitude as she crosses the bar, h₂ is approximately 6.1 m
Explanation:
The given parameters of the motion of the pole vaulter are;
The mass of the pole vaulter, m = 57 kg
The speed with which the pole vaulter is running, u = 11 m/s
The speed of the pole vaulter when she crosses the bar, v = 1.1 m/s
The acceleration due to gravity, g = 9.8 m/s²
From the total mechanical energy, M.E. equation, we have;
M.E. = P.E. + K.E.
Where;
P.E. = The potential energy of the motion = m·g·h
K.E. = The kinetic energy of the motion = 1/2·m·v²
By the principle of conservation of energy, we have;
The change (loss) in kinetic energy, ΔK.E. = The change (gain) in potential energy, ΔP.E.
ΔK.E. = 1/2·m·(v² - u²)
ΔP.E. = m·g·(h₂ - h₁)
Where;
h₁ = The ground level = 0 m
h₂ = The altitude with which she crosses the bar
∴ 1/2·m·(v² - u²) = m·g·(h₂ - h₁)
(h₂ - h₁) = (v² - u²)/(2·g) = (11² - 1.1²)/(2·9.8) = 6.11173469388
h₂ = 6.11173469388 + h₁ = 6.11173469388 + 0 = 6.11173469388
h₂ = 6.11173469388
Her altitude as she crosses over the bar, h₂ ≈ 6.1 m.
a light bulb with a resistance of 2.0 ohms is connected to a 1.5 v battery. what is the current in the circuit?
Explanation:
I= V/R V = 1.5v R = 2 ohm I =1.5/2 = 1.5×10/2×10 =15 / 20 =3/4 I = 0.75 ATaking into account the Ohm's Law, the current in the circuit is 0.75 amperes.
The basic relationships of the intensity of the current, voltage and resistance are as follows:
The current intensity of a circuit increases when the voltage is increased without varying the resistance. The current intensity of a circuit decreases when resistance is increased without varying the voltage.These two relationships constitute Ohm's Law. So, Ohm's law is the relationship between electrical conductors and their resistance, which establishes that the current that passes through the conductors is proportional to the voltage applied to them.
Ohm's law expressed mathematically is:
V = R×I
where:
V is the electric potential in voltsI is the current in amperesR is the resistance in ohms.In this case, you know:
V= 1.5 voltsR= 2 ohmsI= ?Replacing:
1.5 volts= 2 ohms* I
Solving:
I= 1.5 volts ÷2 ohms
I= 0.75 amperes
In summary, the current in the circuit is 0.75 amperes.
Learn more about Ohm's law:
https://brainly.com/question/12372387?referrer=searchResultshttps://brainly.com/question/11420583?referrer=searchResultshttps://brainly.com/question/796939?referrer=searchResultsif john's baseball has a uniform acceleration of 11.18 m/s2 at time T= 3, what should it's acceleration measure at time T= 5?
A slingshot is fired with an initial velocity of 100 m/s at an angle of 55° follows a parabolic trajectory and hits a stationary balloon at the top of its path. With what horizontal speed does the slingshot pebble hit the balloon?
Answer:
The horizontal speed with which the slingshot hits the balloon is approximately 57.358 m/s
Explanation:
The given parameters of the slingshot motion are;
The initial velocity of the slingshot, v = 100 m/s
The angle (to the horizontal) at which the slingshot is fired makes, θ = 55°
The path of the slingshot which hits the stationary balloon at the top of its flight = Parabolic trajectory
The horizontal component of the velocity = vₓ = v·cos(θ) = Constant
vₓ = 100 × cos(55°) ≈ 57.358
The horizontal speed with which the slingshot hits the balloon = vₓ ≈ 57.358 m/s.
PLZZZZ HELLPPP
Which topic might a television news show present to inform viewers about
evacuation procedures during a hurricane alert? (3 points)
O The story of one man who decided not to evacuate to take care of his pets
A human-interest segment about how local hospitals deal with weather problems
O A discussion of arrests and charges brought against looters during the last hurricane
An explanation of local evacuation routes and current traffic conditions on each
Type of mirror used as a side mirror on a vehicle to provide a wide angle view...
Answer:
yes done first thing tomorrow
Answer:
convex mirror is used in vehicle to provide a wide angle view
A 35 N force makes a 10 degree angle with the positive x-axis. What is the magnitude of the vertical component of the force?
Answer:
6.07 N
Explanation:
Given that,
Force, F = 35 N
It makes 10 degree angle with the positive x-axis.
We need to find the magnitude of the vertical component of the force. It can be given by :
[tex]F_y=F\sin\theta\\\\=35\times \sin(10)\\\\=6.07\ N[/tex]
So, the magnitude of the vertical component of the force is 6.07 N.
Answer:
Vertical component of force is equal to [tex]6.067[/tex] N
Explanation:
The magnitude of the vertical component on any force when α is the angle between the direction of force and the X -axis is
[tex]F_y = F * Sin\alpha[/tex]
Substituting the given values in above equation, we get -
[tex]F_y = 35 * Sin 10\\F_Y = 35 * 0.1736\\F_Y = 6.067[/tex]
Vertical component of force is equal to [tex]6.067[/tex] N