Answer: False
Explanation: Physical change is a change in which there is no rearrangement of atoms and hence there is no production of new substances.
[tex]H_2O(l)\righatleftharpoons H_2O(g)[/tex]
This is a physical change in which water only changes its state from liquid to gas.
Chemical change is a change in which there is rearrangement of atoms and hence there is production of new substances.
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
This is a chemical change in which sodium combines with chlorine to form new substance sodium chloride.
how is tempature related to kinetic energy
A spacecraft is separated into two parts by detonating the explosive bolts that hold them together. the masses of the parts are 1300 kg and 1700 kg. the magnitude of the impulse on each part from the bolts is 210 n · s. with what relative speed do the two parts separate because of the detonation?
Pitch describes the loudness of a sound.
True False?
Sean drew this diagram and labeled an unknown gas as gas A. Which gas does A represent?
What is the final speed?
How do fission nuclear reactions differ from fusion nuclear reactions?
In the 2008 Olympics, Jamaican sprinter usain's bolt average shocked the world as he ran the 100- meter dash in 9.69 seconds. Determine usain's average speed for the race.
Sources of natural gas include all of the following except:
flyash
oil wells
biomass
landfills
Answer: fly ash
Oil well, biomass and landfill are the sources of the natural gas. But fly ash is not the source of natural gas because it is formed by the combustion of the coal during the electricity generation process.
Oil well is a boring inside the earth crust which is digg open to obtain crude oil such as petroleum but the natural gas which sometimes lies above the liquid petroleum also collected.
Biomass is the reservoir of organic matter it is main composition of all living organisms. The decaying matter is a form of biomass. This biomass releases natural gason decomposition.
Landfill is the area where the biodegradable waste is disposed off. The action of biological agents such as bacteria feed upon these wastes and release natural gas.
When joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to select one:?
Answer:
the answer is heat. pleas give me a thanks if the answer is right
Candle wax gradually loses its shape as it is heated. What type of solids is candle wax. Explain
When you open a fridge door is it endothermic or exothermic?
Final answer:
When you open a fridge door, the process is endothermic because the refrigerator absorbs heat from the warm air that enters, which cools the inside.
Explanation:
When you open a fridge door, the process is endothermic. The refrigerator absorbs heat from the surroundings to cool the items inside. During this process, the system (inside of the fridge) gains heat from the warm air that enters when the door is open. By convention, the sign of q (the quantity of heat) for an endothermic process is positive because the system is gaining heat. On the other hand, an exothermic process would be like the inside of a freezer making ice, where heat is removed from the water to freeze it, thus releasing heat to the surroundings.
Understanding the endothermic nature of refrigeration is essential for designing efficient cooling systems, as it allows for the controlled absorption of heat to maintain lower temperatures inside the fridge. The principles of endothermic and exothermic processes guide the engineering of various thermal systems, influencing their energy efficiency and overall performance.
Hanna tosses a ball straight up with enough speed to remain in the air for several seconds?
a.what is the velocity of the ball when it reaches its highest point?
b.what is the velocity 1 s before it reaches its highest point?
c.what is the change in its velocity during this 1-s interval?
d.what is its velocity 1 s after it reaches its highest point?
e.what is the change in velocity during this 1-s interval?
f.what is the change in velocity during the 2-s interval(caution velocity not speed)?
g.what is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity
Answer:
Explanation:
In the free fall motion we have that the acceleration is constant and produced by gravity, this acceleration has a magnitude of 32 ft/s2 or 9.8 m/s2 depending on the units you are working with. This means that every second the speed changes a magnitude of 32 ft/2, the velocity will depend of whether the ball is going upward (positive) or downward (negative).
A) At the highest point the ball stops to start the descend, here v=0 ft/s
B) +32 ft/s. The vector is going up, in the next second the velocity is going to be 0 (negative acceleration)
C) V=vf-vo=0-32=-32 ft/s is the constant change in velocity in projectile motion
D) -32 ft/s. The vector is pointing downward
E) V=vf-vo=-32-0=-32 ft/s is the constant change in velocity in projectile motion, 32 ft/s per second
F) Delta V=vf-vo=-32-32=-72 ft/s
g) gravity acceleration is constant 32 ft/s2 (pointing downward vector)
What causes the moon's phases?
a. the rotation of the moon on its axis
b. earth's tilt on its axis as it revolves around the sun
c. changes in how much of the sunlit side of the moon faces earth.
d. the position of the moon each month in relation to?
C.
Changes in how much of the sunlit side of the moon faces Earth
Which of the following is a supersonic speed? Mach 0.005 Mach 0.05 Mach 0.5 Mach 5
I just had this question, the correct answer is March 5
What are the three subatomic particles? Where are they found within an atom? What charge do they each have?
How does the mass of an astronaut change when she travels from earth to the moon? how does her weight change?
Answer:
Mass does not change
Weight redueces on the moon
Explanation:
The mass of an object never changes with respect to the astronomical body it is on. The mass of an object is the resistance it provides to a force which is applied.
A 1 kg object is an 1 kg object anywhere in the universe.
Weight is the affect of an astronomical object's gravity on it
[tex]W=mg[/tex]
where,
m = Mass of the object
g = Acceleration due to gravity
[tex]g_e[/tex]=Acceleration due to gravity on Earth = 9.81 m/s²
[tex]g_m[/tex]=Acceleration due to gravity on Moon = 1.62 m/s²
Weight on Earth
[tex]W_e=mg_e\\\Rightarrow W_e=9.81m[/tex]
Weight on Moon
[tex]W_m=mg_m\\\Rightarrow W_m=1.62m[/tex]
Dividing the equations we get
[tex]W_m=\frac{1.62}{9.81}W_e\\\Rightarrow W_m=0.165W_e[/tex]
The weight of the astronaut on the moon will be 0.165 times the weight on Earth.
So, the weight of the astronaut will be reduced on the moon
The shopper pays for his groceries and pushes the shopping cart out of the store, where he encounters a ramp that helps him move the cart from the sidewalk down to the parking lot. What force accelerates the cart down the ramp?
Answer:
Gravitational force will accelerate the cart.
Explanation:
In the given case the cart is on a ramp in this situation the gravitational force is applied normally on the cart and its horizontal component which is [tex]mgcos\theta[/tex] and its vertical component which is [tex]mgsin\theta[/tex] acting along the ramp.
In this situation as we the acceleration is increased by a factor [tex]gsin\theta[/tex] which helps in increasing its acceleration.
Therefore acceleration due to gravity will accelerate the cart.
An analogy makes a comparison between objects based on their similar qualities. Cassidy wanted to create an analogy for the motion of atoms in solids, liquids, and gases, so she compared them to marbles in a tray. Which best compares the phases of matter to marbles in a tray? A solid is like the tray being shaken and the marbles moving around it, and a liquid is like the tray being shaken slowly and all the marbles moving in their positions. A solid is like the tray being shaken slowly and all the marbles moving in their positions, a liquid is like the tray being shaken and the marbles moving around it, and a gas is like the tray being shaken hard and the marbles moving vigorously around it. A gas is like the tray being shaken slowly and all the marbles moving in their positions, and a solid is like the tray being shaken hard and the marbles moving vigorously around it. A liquid is like the tray being shaken hard and the marbles moving vigorously around it, and a gas is like the tray being shaken slowly and all the marbles moving in their positions.
Answer:
The answer is b for anyone wondering.
Explanation:
As a cat pounces on a mouse, her muscles burn 10 units of potential energy (which the cat previously gained from eating). however, the pounce itself only required 4 units of kinetic energy. how many units of energy were dissipated as heat?
In the circuit diagram, what does the symbol made of two long lines and two short lines with a positive and a negative sign at each end represent? a source of electrical energy an electrical conductor an electrical resistor a closed switch
For those seeking for the answer, its a source of electrical energy.
Answer:
its a source of electrical energy.
Explanation:
What does a DIP sign mean
A DIP sign is a geological term that represents the inclination of a rock layer or feature, which includes the angle of dip and the compass direction. It is recorded using the right-hand rule, with the strike direction being perpendicular to the dip. An example would be 040/30 SE, indicating a strike of 040° and a dip of 30° towards the southeast.
Explanation:A DIP sign in geological terms refers to the angle at which a rock layer or geological feature is inclined from the horizontal plane. The measurement of the dip includes both the angle of inclination and the compass direction in which the layer is dipping. According to the right-hand rule for geological measurements, if you place your right hand on the dipping layer with your fingers pointed in the direction of the dip, your thumb will point in the direction of the strike. Therefore, the strike is always perpendicular to the dip direction.
For example, if the strike is 040° and the dip is 30°, you would record this as 040/30 SE. This indicates that the geological plane has a strike roughly in the NE direction and dips to the SE at a 30° angle. The indication of the compass direction (SE in this case) is important to confirm that the right-hand rule measurement was performed correctly. Conversely, a dip measurement of 225/30 would imply a NW dip direction, since it is clockwise from the strike.
Which of the following best describes what went wrong with the scientists’ study? an improper experimental procedure the lack of a control group selection bias human error
Newton Calculation Error
in the book "Principia Mathematica" contains a simple calculation error that was not discovered for 300 years. Errors occur in Proposition Eight, where Newton presents a formula for calculating the mass of the planet, involving angles formed by two specific lines.
Further explanation
The mistakes made by scientists:
Galileo's Tidal TheoriesHe was wrong from the start, starting his efforts to explain the tidal movements with a false premise - namely that it was caused by the rotation of the earth around the sun. This means the theory is incorrect because it is based on mistakes.
Darwin and the Theory of HeredityOne problem with Darwin's original theory concerns heredity. Many people have a misconception about how characteristics are passed down from parents to their children. The problem is that this notion of mixed genetics contradicts Darwin's own theory. If that is true, then the characteristics will not change from generation to generation through natural selection.
Triple helix from Linus PaulingDespite getting the Nobel Prize, Pauling admitted there was an error in his discovery. The model is wrong for a very simple reason: This includes the triple helix. He also made a basic mistake in his calculations, and the nucleic acid molecule in his model was actually not acidic.
Edwin Hubble's Universe CalculationsAccording to Hubble, the universe is two billion years old. This statement is proven wrong. In the 1930s, a study said the earth was between three and five billion years old. Obviously, our planet cannot be older than the universe, so something's wrong with Hubble.
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Scientist https://brainly.com/question/6701391
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Class: High School
Subject: Physics
Keywords: scientist, mistake, newton
Answer the question below based on the periodic table entry for bromine.
How many neutrons does bromine have?
10
35
45
80
How do you calculate force?
If an object moves with a constant velocity, what is the acceleration of the object? What is the net force acting on the object?
An object moving with constant velocity has an acceleration of zero and a net force acting on it also zero, as forces are balanced and it is in equilibrium according to Newton's second law.
Explanation:If an object moves with a constant velocity, the acceleration of the object is zero. This is because acceleration is defined as the change in velocity over time, and if the velocity is constant, there is no change. Therefore, according to Newton's second law, which states F = ma (force equals mass times acceleration), if the acceleration is zero, the net force acting on the object must also be zero. This scenario is true for all objects in equilibrium, whether they are moving at constant velocity or are stationary relative to Earth. Objects in equilibrium have net forces that are balanced, resulting in no acceleration.
As for the net force acting on the object, it would also be zero. When an object travels at constant velocity, it is not accelerating, which means the forces acting on it are in equilibrium—the sum of all forces equals zero. This could include situations such as a car moving at a steady speed on a flat road where the engine's thrust equals the frictional forces opposing it.
If you divide velocity m/s by time (s), what units do you get?
If you divide velocity meters/second by time (seconds )then we would get the acceleration in meters/second², because the rate of change in the velocity is known as the acceleration of the object.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem If you divide velocity meters/second by time (seconds )then we have to find the result,
acceleration= meters/second/ seconds
=meters/second²
Thus, the object's acceleration is the rate at which its velocity changes. We may determine acceleration in meters/second2 by dividing the object's meters/second velocity by the passage of time.
To learn more about acceleration from here, refer to the link;
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In the formula vy = ayt, what is the value of ay for an object in projectile motion?
–9.8 m/s2
0 m/s2
m/s2
1.0 m/s2
Answer : The correct option is (A) [tex]-9.8\ m/s^2[/tex]
Explanation :
The formula is given as :
[tex]v_y=a_yt[/tex]
Where,
[tex]v_y[/tex] is vertical component of velocity.
[tex]a_y[/tex] is the vertical component of acceleration.
In a projectile motion, the particle moves in a path under the influence of gravity.
So, the vertical component of acceleration is -g i.e acceleration due to gravity.
Hence, the correct option is (a) " [tex]a_y=-9.8\ m/s^2[/tex] ".
The light-gathering power of a 4-meter telescope is ________ than that of a 2-meter telescope.
Final answer:
The light-gathering power of a 4-meter telescope is significantly greater than that of a 2-meter telescope due to the proportional increase in aperture area, allowing it to collect four times as much light.
Explanation:
The light-gathering power of a 4-meter telescope is significantly greater than that of a 2-meter telescope. This is because the light-gathering ability of a telescope is determined by the area of its aperture (the mirror or lens that collects light), and this area increases with the square of the diameter of the aperture. Therefore, a 4-meter diameter telescope has an aperture area that is 4 times larger than that of a 2-meter diameter telescope, allowing it to gather significantly more light.
To illustrate, if a 1-meter telescope collects a certain amount of light, a 4-meter telescope, with 16 times the area, would collect 16 times as much light. Similarly, compared to a 2-meter telescope, a 4-meter telescope, having an area four times greater (since the area is proportional to the square of the diameter), can collect four times as much light.
If an electron loses energy what may happen to it
If a projectile fired beneath the water, straight up, breaks through the surface at a speed of 13m/s, to what height above the water will it ascend
The projectile will ascend to a height of 9.9 meters above the water's surface.
Explanation:To find the maximum height above the water, we can use the equations of motion for projectile motion. First, we need to find the time it takes for the projectile to reach the surface of the water. We can use the equation y = v0t + (1/2)at2, where y is the displacement, v0 is the initial velocity, a is the acceleration due to gravity, and t is the time.
Given that the initial velocity is -13m/s (since the projectile is moving in the opposite direction of the acceleration due to gravity), the acceleration due to gravity is -9.8m/s2, and the displacement is 0 (since the projectile breaks through the surface of the water), we can rearrange the equation to solve for t: 0 = -13t + (1/2)(-9.8)t2. By solving this quadratic equation, we find that t = 1.33s or t = 0.
Since the time can't be negative, we discard the t = 0 solution. Therefore, the time it takes for the projectile to reach the surface of the water is t = 1.33s. Now, to find the maximum height above the water, we can use the equation v = v0 + at, where v is the final velocity, v0 is the initial velocity, a is the acceleration, and t is the time.
Using the known values: v = 0m/s (since the projectile comes to a stop at its maximum height), v0 = -13m/s, a = -9.8m/s2, and t = 1.33s, we can rearrange the equation to solve for the maximum height h: 0 = -13 - 9.8(1.33) + h. By solving this equation, we find that h = 9.9m. Therefore, the projectile will ascend to a height of 9.9 meters above the water's surface.