Answer:
Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.
Which types of changes observe the law of conservation of mass?
A.only changes of state
B.only physical changes
C.only chemical changes
D.physical changes and chemical changes
Answer:
I think it might be umm... b
The correct answer is actually D
Explanation: i got it right on my district assignment! :)
How can positive feedback influence the stability of a system?
A. It can cause the system to remain stable as long as inputs are
constant
B. It can cause the system to oscillate between stability and
instability
c. It can cause instability that eventually results in the system's
destruction
D. It can cause instability by reversing the direction of the system,
The positive feedback influence the stability of a system is: It can cause the system to remain stable as long as inputs are constant. Hence, option (A) is correct.
What is stability ?A body's capacity to return to its initial static equilibrium after being slightly shifted is referred to as stability.
A body in equilibrium doesn't suffer linear acceleration or a turning effect, and unless a force from the outside disturbs it, it will stay in that state forever. (The First Law of Newton)
When tiny, externally induced displacements from an equilibrium result in forces or torques that tend to oppose the displacement and bring the body back to its initial equilibrium, the equilibrium is said to be stable.If even the smallest deviations result in forces or torques that tend to increase the displacement, the equilibrium is said to be unstable.Learn more about stability here:
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Answer:c
Explanation:got it wrong bc the other person didn’t know bc their small minded
An airplane flying due north at 90 km/h is being blown due
west at 50 km/h. What is the resultant velocity of the plane?
a
74 km/hr
b 82 km/hr
С
103 km/hr
d 95 km/hr
Answer:
74km/h
Explanation:
Answer:
103 km/hr
Explanation:
Which statement best describes the size of the outer planets? All the outer planets are large. All the outer planets, except Saturn, are large. The inner planets are larger than the outer planets. Jupiter is a large planet, while the other outer planets are small.
Answer:
all outer planets are large
Explanation:
The sun and the planets compose the solar system. The common factor among all the outer planets is that they are large.
What are the planets?The planets constitute an essential part of the solar system. The sun is at the center of the solar system and is surrounded by the planets.
Now the earth is the third planet in the solar system. The outer planets are the planets that are all far from the sun. The common factor among all the outer planets is that they are large.
Learn more about planets: https://brainly.com/question/14581221
A scientist has two containers. Inside each container, there is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the SAME substance? *
Cosmologists are scientists who study stars, galaxies, black holes, and other objects in the universe. In order to study the billions and billions of stars, cosmologists use highly advanced telescopes and create computer models to trace the stars’ motion.
What is one type of limitation that requires cosmologists to use these telescopes?
A.money
B.time
C.the size of the system
D.ethical concerns
Answer:
a
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The answer is D, ethical concerns.
Good luck on the Unit Test, fellow edge.nuity user.
Determine the skater's average velocity from t= os to t= 16s. (average velocity is the displacement (final position minus initial position) divided by time elapsed.)
Answer:
v = 0.5 m/s
Explanation:
The attached figure shows Robin's positions wrt time who is rollerskating down a marked side walk.
We need to find the skater's average velocity from t= os to t= 16s.
Average velocity = displacement/time
Displacement = final postion - initial position
Displacement = (8 - 0) m/s
Displacement = 8 m/s
Time, t = (16 - 0) s
So,
[tex]v=\dfrac{(8-0)\ m}{(16-0)\ s}\\\\v=0.5\ m/s[/tex]
So, the skater's average velocity from t= os to t= 16s is 0.5 m/s.
What is the momentum of A 200 kg shark swimming at 15 m/s? bruh please help im failing and dont understand this:)
Answer:
p = 3000 kg-m/s.
Explanation:
Given that,
Mass of shark, m = 200 kg
Speed of the shark, v = 15 m/s
We need to find the momentum of the shark. It can be calcullated as follows :
p = mv[tex]p=200\ kg\times 15\ m/s\\\\p=3000\ kg-m/s[/tex]
So, the momentum of the shrak is 3000 kg-m/s.
Basketball is __________ to the United States
Question 4 options:
Native
Foreign
New
Unknown
Answer:
native
Explanation:
bc it was started when we were playing it with baskets
An advertising balloon shaped like a giant soda can is 15 feet tall and 7 feet wide. How many cubic feet of helium will be needed to fully inflate the balloon?
Answer:
576.975 cubic feet of helium will be needed to fully inflate the balloon
Explanation:
To determine how many cubic feet of helium will be needed to fully inflate the balloon, we will determine the volume of the balloon.
From the question,
The balloon is shaped like a giant soda can.
A giant soda can is cylindrical.
Hence, we can determine the volume of the balloon shaped like a giant soda can by using the formula for finding the volume of a cylinder.
The formula for finding the volume of a cylinder is
V = πr²h
Where V is the volume of the cylinder
π is a constant (Take π = 3.14)
r is the radius of the cylinder
and h is the height of the cylinder
From the question, the balloon is 15 feet tall and 7 feet wide
Hence,
Height, h = 15 feet
Width = 7 feet
(NOTE: The width of a cylinder is the same as the diameter)
Then, diameter = 7 feet
Radius, r is given by
Radius = Diameter / 2
Then, Radius = 7 feet / 2 = 3.5 feet
∴ Radius, r = 3.5 feet
Now, for the volume of the balloon,
V = πr²h
V = 3.14 × (3.5)² × 15
V = 3.14 × 12.25 × 15
V = 576.975 cubic feet
This is the volume of the balloon.
Hence, 576.975 cubic feet of helium will be needed to fully inflate the balloon.
Love, which can’t be observed or measured directly, is an example of a psychological construct. true or false
Answer:
The answer is True
Love, which can’t be observed or measured directly, is an example of a psychological construct.
Explanation:
On edge 2020
Irene was investigating the behavior of gases at certain conditions. Which would most likely cause an increase in the rate of collisions between gas molecules in a container?
Answer:
Increase in temperature
Increase in pressure
Explanation:
For the rate of collisions to increase, It can happen in various ways
1. The gasses can be made to move faster: This can be done by increasing their temperature. An increase in the temperature of the gases directly relates to a corresponding increase in their kinetic energy. This means that the molecules of the gases can move with a greater velocity, which will increase collision rates.
2. The volume of the container can be reduced: Consider this; If the container is made smaller, the molecules of the gases will have less space to move about. This means that they will be bumping into the walls of the container more frequently. This reduction in volume leads to an increase in the pressure of the gas. This is exactly what happens in a piston-cylinder assembly
The increase in the rate of collisions between gas molecules in a container should result in Increase in temperature and Increase in pressure
Reasons for increasing the rate of collisions:1. In the case when the gasses should be quick faster, due to this, the temperature should be increased. In this, the gases molecules should be moved have high velocity
2, Here the container volume should be decreased. Due to this, the volume should be decreased that results in the increment of the gas pressure.
Therefore, The increase in the rate of collisions between gas molecules in a container should result in Increase in temperature and Increase in pressure
Learn more about gases here: https://brainly.com/question/24862829
Which action might lead scientists to develop new explanations about the universe?
Answer:
Designing experiments to replicate the conditions in which life may have first evolved on Earth
Explanation:
In 1953, Stanley L. Miller and Harold C. Urey conducted an experiment to prove that life started from inanimate objects. The research was conducted by utilizing proposed chemical substances, mixed together through a scientific design process. The outcome of the research is the predicted atmospheric conditions before the pre-living form started on earth.
Therefore, in this case, the action that might lead scientists to develop new explanations about the universe is "Designing experiments to replicate the conditions in which life may have first evolved on Earth."
1. Reflection Question: What are some actions or activities that can affect your heart rate and respiratory rate and cause either or both of them to increase or decrease?
Answer:
There are following two activities which affect heart rate and respiratory rate.
1-Exercise
2-Hiking
Explanation:
when we are exercising or hiking our heart rate and respiratory rate affected. This is because during hiking and exercising our body may need three or four time your normal cardiac output. This is because our body consuming energy during the workout and our muscles needs more oxygen. To meet the need of energy and oxygen respiration rate become fast and heart rate also increase.
What was the caloric theory of heat?
Answer:Caloric theory, explanation, widely accepted in the 18th century, of the phenomena of heat and combustion in terms of the flow of a hypothetical weightless fluid known as caloric. ... The idea of an imaginary fluid to represent heat helped explain many but not all aspects of heat phenomena.
Explanation:
please give me brainliest....
Write a hypothesis about the effect of the fan speed on the acceleration of the cart. Use the "if . . . then . . . because . . .” format and be sure to answer the lesson question: "How does an object's position and velocity change as the object accelerates?”
Answer:
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
Explanation:
Edge
Please help me its physics and i need help
1: About 63% of this electricity generation was from fossil fuels
B: The demand for electricity varies throughout the day. When the demand for electricity is greater than the base load, the National Grid reacts by providing additional electricity. ... Hydroelectric power stations have a very short start-up time and are used to provide additional electricity at peak times.
Mickey walks Pluto 4 miles North to the dog park. Mickey finds beautiful
flowers in the park and decides to pick a bouquet. He then walks with
Pluto 3 miles West to give this new gift to Minnie. Mickey's distance is-
1 mile
5 miles
7 miles
12 miles
which of the following best describes inertia?
a) Inertia is the same as mass
b) Inertia is a result of net force
c) Inertia is the ability of an object to change its motion
d) Inertia is the tendency of objects to resist changes in its motion
Answer:
d) inertia is the tendency of object's to resist changes in its motion
Which object has the most thermal energy?
A. A 6 kg rock at 15°C
B. A 6 kg rock at 10°C
C. A 10 kg rock at 10°C
D. A 10 kg rock at 15°C
Answer:
D. A 10 kg rock at 15°C
Explanation:
Thermal energy is heat energy, meaning that the hotter rocks will have more energy.
The heavier/larger rocks can store more energy.
So if we combine the largest two variables, we get a 10kg rock at 15°C.
Answer: D
Explanation:
Density is a chemical property of matter.
TRUE
FALSE
Answer:
False
Explanation:
Density is a physical property of matter.
Answer:
False
Explanation:
Density is NOT a chemical property, it is a physical property.
HELP ME PLZ!!!!! I'LL DO ANYTHING!!!!
PLEASE READ THIS FIRST SO WE GET THE CORRECT ANSWER
In studies about new medicines, researchers usually give one group of patients the medicine that is designed to treat an illness. They give another group of patients a placebo, which is taken the same way as the medicine but does not actually contain the ingredients of any medicine. Different medicines are tested in different experiments, but the placebos usually contain the same non-medical ingredients. If both groups of patients are healed, then researchers cannot be sure whether the medicine caused improvement, but if the group given the medicine is healed while the group given the placebo remains ill, researchers can conclude that the medicine causes the illness to go away.
IN MEDICAL EXPERIMENTS, WHICH GROUP RECEIVES PLACEBOS?
A.the experimental group
B.the control group
C.both the experimental and control groups
D.neither the experimental nor control group
Answer:
B=the control group
Explanation:
Answer:
B
Explanation:
Which statement correctly describes the differences between positive and negative acceleration?
Positive acceleration describes a change in speed; negative acceleration describes no change in speed.
Positive acceleration describes no change in speed; negative acceleration describes a change in speed.
Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.
Positive acceleration describes a decrease in speed; negative acceleration describes an increase in speed.
Which event causes the least amount of time to go by on the game clock?
Question 3 options:
A three-point shot
A bounce pass
A free throw
An alley-oop
The event that causes the least amount of time to go by on the game clock is a free throw.
In basketball, a free throw is an unhindered shot made from behind a set line.This throw (free throw) is produced because of a foul caused by an opponent.The obtention of free throws can be a strategy to win a game.In conclusion, the event that causes the least amount of time to go by on the game clock is a free throw.
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A competitive go-cart driver is traveling 32 m/s. He sees a caution flag go up, so he slows at a rate of -1.5 m/s^2 in 10.8 s. What is his final velocity?
Answer:
15.8 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 32 m/s.
Acceleration (a) = – 1.5 m/s²
Time (t) = 10.8 s.
Final velocity (v) =?
Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it is expressed as:
Acceleration (a) = [final velocity (v) – initial velocity (u)] / time (t)
a = (v – u) /t
With the above formula, we can obtain the final velocity of go-cart driver as follow:
Initial velocity (u) = 32 m/s.
Acceleration (a) = – 1.5 m/s²
Time (t) = 10.8 s.
Final velocity (v) =?
a = (v – u) /t
– 1.5 = (v – 32) / 10.8
Cross multiply
(v – 32) = –1.5 × 10.8
v – 32 = – 16.2
Collect like terms
v = – 16.2 + 32
v = 15.8 m/s
Therefore, the final velocity of go-cart driver is 15.8 m/s.
A dog chase is a cat until the dog gets tired. A graph of its velocity overtime is shown below. What is the dogs average acceleration from 0-12 seconds?
Answer: 0.67 m/s^2
Explanation:
Bc it is trust me
Answer:
.67 m/s^2
Explanation:
khan academy
Difference between si unit and derived unit
Answer:
Derived units are derived from these 7 base units. Derived units are dependent on the base units and are not independent of each other. ... Mass has SI units of kg, distance is measured in m and t has the SI unit of second. Thus, SI unit of force is kg.
Mrs. Franklin loves teaching science and thinks about it all the time. While walking one day, she steps on a warm, fresh piece of used gum. The gum flattens and sticks to her shoe. When she lifts her foot, she sees long strings of gum between her shoe and the sidewalk. She thinks, “What a great demonstration of the properties of metals!” What properties of metals would Mrs. Franklin most likely teach about with this demonstration?
Answer:
Ductility and Malleability
Explanation:
In 1993, Ileana Salvador of Italy walked 3.0 km in under 12.0 min. Suppose that during 115 m of her walk Salvador is observed to steadily increase her speed from 4.20 m/s to 5.00 m/s. How long does this increase in speed take?
Answer:
t = 25 seconds
Explanation:
Given that,
Distance, d = 115 m
Initial speed, u = 4.2 m/s
Final speed, v = 5 m/s
We need to find the time taken in increasing the speed.
We know that,
Acceleration, [tex]a=\dfrac{v-u}{t}[/tex] ....(1)
The third equation of kinematics is as follows :
[tex]v^2-u^2=2ad\\\\\text{Put the value of a in above equation}\\\\v^2-u^2=2\times \dfrac{v-u}{t}\times d\\\\\because (a^2-b^2)=(a-b)(a+b)\\\\(v-u)(v+u)=\dfrac{2\times (v-u)d}{t}\\\\t=\dfrac{2d}{v+u}\\\\\text{Putting all the values}\\\\t=\dfrac{2\times 115}{4.2+5}\\\\t=25\ s[/tex]
Hence, it will take 25 seconds to increase the speed.