Physics Middle School
its actually a,c & d :) on edg
Answers are, A, B, C, and D
What are newtons laws?
Newton's 1st law: An object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force.
Newton's 2nd law: Force equals mass times acceleration.
Newton's 3rd law: For every action, there is an opposite and equal reaction.
The denser a substance, the more tightly packed it is. The table below shows the volume and mass of two different substances. Comparison of Substances SubstanceVolume (cm3)Mass (g) R2210 S5525 Which of the two substances is more tightly packed? Object R is more tightly packed. Object S is more tightly packed. Both objects are packed equally tightly. This cannot be determined.
Both objects are packed equally tightly.
For Substance R we have
mass = 10 g
Volume = 22 cubic cm
So we know that density is defined as
here we have
For substance S we have
mass = 25 g
Volume = 55 cubic cm
So we know that density is defined as
here we have
So here both have same density
so correct answer would be
Both objects are packed equally tightly.
According to Newton's first law of motion, what will an object in motion do when external force acts
come to a stop
move at the same velocity
It could speed up, change direction, come to a complete stop, or slow down without stopping.
The one thing the object could NOT do is keep moving with the same velocity. Its velocity must change.
move at the same velocity
Acid rain is a secondary pollutant.
T or F
True, acid rain is a secondary pollutant
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons and nitrogen oxides combine in the presence of sunlight, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.
What is one of Kepler's laws of planetary motion?
The Kepler laws of planetary motion are:
1) The planets revolve around the Sun following elliptical orbits, in which the Sun occupies one of the two focii
2) A line segment connecting the Sun with the center of each planet sweeps out equal areas in equal intervals of time --> this means that the speed of the planet changes according to its distance from the Sun: the closer to the Sun, the faster the planet
3) The square of the orbital period of the planets is proportional to the cube of the semi-major axis of the orbit. In formula
and the constant in the equation has the same value for every planet orbiting around the Sun.
Which is an example of convection?
Boiling water - The heat passes from the burner into the pot, heating the water at the bottom.
In which section of nuclear fussion occur A. reactor vessel
B. heat exchanger
D. cooling tower
Answer It is the reactor vessel
What are the primary colors of visable light
Light Color Primaries (Red, Green, Blue)Pigment Color Primaries (Cyan, Magenta, Yellow)
Which type of material is good at transferring heat?
Please mark brainliest and have a great day!
Metal is the most !!
Fluorine and chlorine molecules are blamed for
Destroying ozon molecules
Please mark brainliest and have a great day!
The theory that light exists in quantized "chunks" was proposed in response to which of the following?
A. Electron interference patterns
B. Discovery of Planck's constant
C. The ultraviolet catastrophe
D. Emission spectra
The ultraviolet catastrophe.
Its D because of the emission spectra
10. A person with a mass of 15 kg is walking uphill at a velocity of 2 m/s. What is the walker's momentum? A. 15 kg-m/s
B. 30 kg-m/s
C. 10 kg-m/s
D. 13 kg-m/s
16. Two bouncy balls colliding with each other is an example of what type of collision?
A. Inelastic collision
B. Elastic collision
C. Parallel collision
D. Mass collision
Which of the following is considered to be a vector?
10. B. 30 kg.m/s
16. B. Elastic collision
10. Momentum is simply the product of mass and velocity of an object. So it can be soved with the equation:
p = mv
p = momentum (kg.m/s)
m = mass (kg)
v = velocity (m/s)
Your problem gives you the following:
m = 15 kg
v = 2 m/s
So just fill in what you know:
p = mv
p = (15kg)(2m/s) = 30 kg.m/s
16. Elastic collision occurs when two objects collide and no loss in energy occurs after collision. Supposing that the balls are very bouncy, let's say they bumped into each other and they bounce-off of each other. If there is no loss in speed on both ends, that means that this is an elastic collision.
20. To differentiate vector and scalar quantity, just remember that vectors have direction. Both quanitites show magnitude, but vector quantities indicate the direction the magnitude is going. Among all the choices, it is only velocity that is considered as a VECTOR quantity.
Which from the following is NOT a Renewable Energy?
Which of the following reactions is a synthesis reaction? N2 + 3H2 → 2NH3
MgI2 + Br2 → MgBr2 + I2
KClO3 → KCl + O2
HCl + NaOH → NaCl + H2O
the answer is A) N2 + 3H2 → 2NH3
multiple reactants combine to form one product
option b is a single replacement
option c is a decomposition
options c is a double replacement
so the answer has to be A out of elimination anyway
Answer:The answer is B
Which of the following equations is not balanced? N2 + 3H2 → 2NH3
A. N2 + 3H2 → 2NH3
B. MgI2 + Br2 → MgBr2 + I2
C. KClO3 → KCl + O2
D.HCl + NaOH → NaCl + H2O
(C) is correct option
Balanced equation :
In balanced equation, The number of atoms of each element in product side equal to the number of atoms of each element in reactant side.
The equation is not balanced in option C.
In this equation, The number of oxygen element in product side is not equal to the number of oxygen element in reactant side.
All equations are balanced.
Answer: C) KClO3 → KCl + O2
the equation has an unequal amount of oxygen.
you can confirm because all the other equations are balanced so the answer is c
Suppose that the half-life of an element is 1000 years. How many half-lives will it take before one-eighth of the original sample remains? 8
The half-life of a radioactive isotope is the time it takes for the mass of the sample to halve.
This can be rewritten as follows:
m(t) is the mass of the sample at time t
m0 is the original mass of the sample
n is the number of half-lives that passed
We see that if we take n=3, the amount of original sample left is
So 3 (3 half-lives) is the correct answer.
the answer is 3
The change from a liquid to a gas or solid to a liquid is an example of a change of.. a.) chemical b.) physical c.) atomic d.) nuclear e.) phase
the answer is a.) chemical
It is a base because of the presence of hydroxide
An acid is a compound that has H as its metal as HCl
A base is a compound that has OH as its nonmetal as in KOH.
A salt has neither, and that's what this is (CuSO4)
An acid has H as its metal as in H2SO4
A base has OH as its nonmetal as in Mg(OH)2
A salt is made of neither. That's what NaCl is -- a salt.
What does a weather balloon do? ›
Weather balloons are the primary source of data above the ground. They provide valuable input for computer forecast models, local data for meteorologists to make forecasts and predict storms, and data for research.What weather data do they get from a weather balloon? ›
These observations include vertical profiles of temperature, humidity, wind speed and direction, atmospheric pressure, and geopotential height.What is the purpose of launching a weather balloon quizlet? ›
A weather balloon is launched into the atmosphere by meteorologists. When the balloon reaches an altitude where it is neutrally buoyant, it transmits information about weather conditions to monitoring stations on the ground.How can a weather balloon be used to predict future weather conditions in a location? ›
Thanks to weather balloons, officials can prepare for a weather disaster hours before it strikes. Weather balloons collect and send the following critical data back to the ground: wind speed, wind direction, air pressure, air temperature, relative humidity, cloud type, and GPS location.What happens when weather balloons rise? ›
As the balloon rises, the gas inside the balloon expands because the atmospheric pressure surrounding the balloon drops. The atmosphere is 100 to 200 times less dense at the float altitudes than on the ground.How accurate is a weather balloon? ›
On average, the balloons make it around 20 miles high before they burst. Airplanes only fly between 6 and 7 miles high. According to NWS meteorologist Francis Kredensor, the data the balloons send back is some of the most accurate in the world of weather.What sensors are on a weather balloon? ›
People use a radiosonde, hanging on a string underneath the balloon, to measure atmospheric data for making an accurate weather forecast. The radiosonde carries sensors to collect observation including the gathering of air pressure, temperature, and relative humidity.What are the advantages of using weather balloon rather than an aircraft? ›
Fewer errors as the aircraft movement/heat could affect the data from the sensors. If the air balloon is checking wind speed it is floating/constant speed therefore more accurate. Safer, in the event of severe/extreme weather conditions due to the weather balloon not being manned.What is the reason why a balloon will pop in the atmosphere? ›
Pressure decreases as we go up in the atmosphere so when the helium balloon rises up the pressure inside the balloon becomes more than the pressure outside and so the balloon first expands and then finally bursts.What was the purpose of the hot air balloon when it was invented? ›
In 1874 Jean Pierre Blanchard successfully flew across the English channel using hydrogen. Ballooning made major advances through scientists and because of war. Gas balloons were used by the french as lookouts and were often called the spies of the sky.
What is used to predict weather changes? ›
Observational data collected by doppler radar, radiosondes, weather satellites, buoys and other instruments are fed into computerized NWS numerical forecast models. The models use equations, along with new and past weather data, to provide forecast guidance to our meteorologists.What are the things used to predict the weather? ›
Land-based weather stations around the world and automatic stations observe the atmospheric pressure, wind direction and speed, temperature of the air, humidity, clouds, precipitation and visibility using standard weather instruments such as the barometer, wind vane, anemometer, thermometer, psychrometer or hygrometer ...What factors determine the altitude at which a weather balloon will burst? ›
The atmospheric temperature, pressure, air density, size of balloon, amount of fill, payload mass and many other factors contribute to what altitude a balloon can reach.What is the explanation of a balloon? ›
A balloon can be defined as an inflatable flexible bag filled with a gas, such as helium, hydrogen, nitrous oxide, oxygen, or air. Modern balloons are made from materials such as rubber, latex, polychloroprene, metalized plastic or a nylon fabric. Long before there was something as stretchy as rubber, balloons existed.What is the balloon experiment? ›
SCIENCE: When baking soda and vinegar are mixed together, it creates a gas called carbon dioxide. The gas begins to expand in the bottle and starts to inflate the balloon. The more gas that is created, the larger the balloon will inflate.What is a sentence with weather balloon? ›
He told that the debris recovered was not a weather balloon, and claimed it did not come from this planet. This example is from Wikipedia and may be reused under a CC BY-SA license. She claimed the pieces looked like a weather balloon.What happens to weather balloons when they come down? ›
Eventually, the weather balloon will pop and the parachute, string, and radiosonde land back on the Earth surface. All items used in a launch are biodegradable except for the radiosonde, which if found, can be returned to the National Weather Service.How far can a balloon travel? ›
The balloon can only rise up until the atmosphere surrounding it has the same weight as the helium in the balloon. This happens at about a height of 20 miles (32 kilometers) above Earth's surface. So, this is as far as a helium balloon can rise.Why do weather balloons get bigger? ›
Answer: The volume of the gas is inversely proportional to the pressure at a given temperature according to Boyle's law. As the weather balloon ascends, the pressure tends to decrease. As a result, the volume of the gas inside the balloon or the size of the balloon is likely to increase.Can anyone fly a weather balloon? ›
To launch a weather balloon in the USA, you must have the approval from the 'Federal Aviation Administration (FAA)'. Please check for the links below for the latest updates on the Laws and Regulations: Federal Aviation Administration (FAA):
How much can a weather balloon hold? ›
Helium, the same gas used to fill party balloons, is used in NASA balloons. These very large balloons can carry a payload weighing as much as 3,600 kilograms (8,000 pounds), about the weight of three small cars.Do weather balloons hit planes? ›
A: Yes, I have seen several weather balloons while in flight. There have been cases where weather balloons have been struck by airplanes. Usually there is no damage to the aircraft, but occasionally to the weather instruments. It's a rare occurrence.Who invented the weather balloon? › What are balloons used for remote sensing observation of? ›
Balloons are used for remote sensing observation (aerial photography) and nature conservation studies. The first aerial images were acquired with a camera carried aloft by a balloon in 1859. Balloon floats at a constant height of about 30 km.What is a fun fact about weather balloon? ›
- The Upper Air Observing Program of NOAA started back in the 1930s.
- Balloons are either filled with helium or hydrogen, both of which are lighter than air.
- The radiosonde is exposed to temperatures as low as -130˚F during its flight.
- Balloon expands as it rises due to the lack of pressure.
Not your average party balloon
As the balloon soars into the atmosphere, they expand to the size of a two-story house. Eventually, the pressure inside the balloon becomes too great for the balloon, and it pops.
Three different colors provide easier sighting under varying weather conditions. The natural color has the greatest visibility on clear days; red is easiest to see in scattered clouds; and black is best for overcast conditions.What are the advantages of ballooning? ›
As you will probably know, hot air balloon rides expose you to a higher quality of fresh air than you are likely to experience on the ground. This has numerous benefits, including increasing energy, producing a higher level of serotonin – the hormone that promotes happiness – and fostering a general sense of wellbeing.Will a balloon with more or less air have greater speed? ›
While the balloon with less air will travel faster but will only end up at a shorter distance.What is the advantage of using a balloon as a mission platform? ›
Balloons have been used for decades to conduct scientific studies. They can be launched from locations across the globe and are a low-cost method to carry payloads with instruments that conduct scientific observations.
Which explains why work is done when blowing a balloon? ›
Newton's third law explains how balloons and rocket engines work. When the neck of an inflated balloon is released, the stretched rubber material pushes against the air in the balloon. The air rushes out of the neck of the balloon.What is the reason why a balloon will stick to a wall? ›
It is due to the electrostatic force between the balloon and the wall. Opposite charges attract each other. Was this answer helpful?What would most likely happen to the balloon if it was instead kept outside in the sun for some time? ›
The balloon has air filled in it. The balloon when kept in sun gets heated and the air inside it also gets heated. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Due to this expansion of gases the balloon bursts.What impact did the hot air balloon have? ›
The invention of the hot air balloon revolutionized the 18th and 19th century fad culture. After years of skepticism, trial and error; the widespread use of this marvel change the American culture of the day.Do you need permission to use a weather balloon? ›
To launch a weather balloon in the USA, you must have the approval from the 'Federal Aviation Administration (FAA)'. Please check for the links below for the latest updates on the Laws and Regulations: Federal Aviation Administration (FAA): FAA Part 101.What causes a weather balloon to burst? ›
As the balloon ascends, the pressure of its environment decreases, and the balloon begins to expand. This expansion continues until the material of the balloon is stretched to its breaking point, causing the balloon to burst. This typically occurs at stratospheric altitudes between 30 and 35 km.Are flying balloons safe? ›
Pilots of hot air balloons will typically take off shortly after sunrise or shortly before nightfall. According to the FAA's Aviation Accident Database, hot air ballooning is the safest form of air travel and is rarely involved in aviation crashes.Can balloons float in air? ›
The helium balloon displaces an amount of air (just like the empty bottle displaces an amount of water). As long as the weight of the helium plus the balloon fabric is lighter than the air it displaces, the balloon will float in the air.Can a weather balloon pick up a person? ›
To lift an adult of average weight, you would need about 5,000 balloons to have enough force. This is too many to use in practice, but people have achieved flight by attaching larger helium weather balloons to lawn chairs and office chairs.Are hobby balloons legal? ›
Federal law requires most large flying objects to be registered with the Federal Aviation Administration. But amateur pico balloons, like K9YO-15, are so small and light that they are not subject to those requirements.
How much weight can a weather balloon lift? ›
Helium, the same gas used to fill party balloons, is used in NASA balloons. These very large balloons can carry a payload weighing as much as 3,600 kilograms (8,000 pounds), about the weight of three small cars.How high can a balloon go before it pops? ›
The balloon can only rise up until the atmosphere surrounding it has the same weight as the helium in the balloon. This happens at about a height of 20 miles (32 kilometers) above Earth's surface. So, this is as far as a helium balloon can rise.What is the highest a weather balloon has gone? ›
While no one can ever guarantee a weather balloon will soar to a specific height, the balloons typically reach between 60,000 and 105,000 feet. However, the highest recorded weather balloon flight on record was launched in 2002 and soared to an incredible height of 173,000 feet.What type of weather is favorable for flying balloons? ›
Good weather for hot air ballooning typically includes calm wind conditions, clear skies, and warm weather. Ideally, light wind speeds should be less than 10 mph, with no gusts present.