What effect will the north pole of one magnet have on the north pole of another magnet.
A. REPULSIVE
B. ATTRACTIVE
C. COMBATIVE
D. NO EFFECT
2.Why are paperclips attracted to magnets?
A.The contain silver
B.They contain aluminum
C.They contain tin
D.They contain iron
3.What is the simplest requirement for an electromagnet?
A.A coil of electrified wire wrapped
B.A bar magnet and a power source
C.A coil of electrified wire
D.A length of electrified wire
please help for 20pts
why does trapped air in a vacuum flask reduce heat loss by conduction?
Answer:
Explanation:
The answers are:
1) D
2) B
3) D
4) C
5) A
6) A
7) D
8) D
9) A
10) B
11) C
12) C
13) C
14) B
15) B
How kinetic energy and speed are related?
A football player kicks a ball with a mass of 0.42 kg. The average acceleration of the football was 14.8 m/s square. How much force did the kicker supply to the football?
Please Help
Scientists have observed earths tectonic plates move in predictable directions. What is the cause of this observation?
A. Uniform pressure inside earths forces the plates to move.
B. Uniform temperature inside earth forces the plates move.
C. Variations in temperatures inside earth forces plates to move.
D. Vibrations in the core forces the plates to move.
Answer:
C Variations in temperatures inside earth forces plates to move.
Explanation: its Approved 2021
Jack and Jill have a pail of water. Which action will cause the molecules of water to move faster?
how many electrons does an element typically try to get on its outer level
What is a main reason why the scientific model of atoms is considered a theory rather than a law?
It has been proven as a fact.
It has been changed over time.
It predicts but does not explain.
It has stayed the same for a long time.
HELP ME PLEASE!!!!
B. It has changed over time.
a car moving 12 m/s stops in 3 seconds vf=
Answer:
The question seems to be looking for vf, which may be the final velocity.
We know that the car stops, so the car is at rest, this means that the final velocity is equal to zero.
vf = 0 m/s
Now, we also can find the acceleration, the velocity equation can be written as:
v(t) = a*t + 12m/s
We know that in 3 seconds the car stops, so we have:
v(3s) = 0 = a*3s + 12m/s
a= -12m/s*(1/3s) = -4m/s^2
So in those 3 seconds where the car is stoping, the acceleration of the car is -4m/s^2, and the velocity of the car in those 3 seconds can be described by the equation:
v(t) = -4m/s^2*t + 12m/s
I have a table that I recorded of my data and my partner's data
My table My partner's table
position (m) Time (s) position (m) time (s)
0m 0 0m 0
2m 2.30 2m 2.74
4m 4.28 4m 2.39
6m 5.00 6m 2.20
8m 5.89 8m 1.80
10m 6.59 10m 3.21
a. Explain how you can use your graph to figure out who had the fast average speed.
b. Explain how you can use your data table to figure out who had the faster average speed
c. Look at each person's line on the graph. How can you use the graph to tell whether you moved at a constant speed? Did you move at a constant speed? Did your partner?
d. Calculate each person's average speed in meters per second and in centimeters per second.
18)
The process of deposition causes
A) rock and soil to slowly be lost.
B) rock and soil to quickly be lost.
C) rock and soil to slowly be gained.
D) rock and soil to quickly be gained.
19)
Roberto's family went to the coast of Georgia. While they were there, Roberto noticed that the rocks close to the water were smooth, and the rocks farther away from the water had more jagged edges. What MOST LIKELY caused the rocks to be smooth instead of rough?
A) birds pecking at the rocks
B) fish swimming over the rocks
C) the sun shining on the rocks
D) waves crashing down on the rocks
20)
Deposition is a process that involves wind carrying sediment and then depositing it in a particular place. One common beach sight formed by deposition is a
A) reef.
B) sand dune.
C) sand castle.
D) barrier island.
21)
batteries properties
Battery Brand average life cost
A 12 hours $0.50
B 18 hours $2.00
C 24 hours $3.50
If a battery is needed for a smoke detector where the biggest priority is for the device to last as long as possible, then which brand is the best choice?
A) Battery A
B) Battery B
C) Battery C
D) All 3 brands are equally good choices.
Eliminate
23)
About 21% of Earth's atmosphere is composed of oxygen. Oxygen can combine with other substances. The chemical reaction of oxygen with other substances is called oxidation and it is a source of chemical weathering. The building on the left has undergone oxidation. Compare the picture on the left with the picture on the right. The building has changed. The rock has changed much like the building.
Describe how the rock on the right has changed over time.
A) Chemical weathering has happened due to acid rain in the area.
B) Oxygen has chemically reacted with minerals in the rock; oxidation has occurred.
C) Water in the atmosphere has caused the rock to rust; it has physically weathered.
D) Physical weathering has taken place and the rock is broken down into smaller pieces.
Eliminate
The difference between a hypothesis and an inference
What physical characteristic is the same for a particular substance regardless of the sample size .
Answer: The answer is melting point I think.
Explanation: I did the Performance Matters. I added a picture of the question just in case anyone else wants to answer.
melting wax
evaporating gasoline
freezing water
These changes are all examples of
A) nuclear changes.
B) physical changes.
C) chemical changes.
D) energy consumption.
Which of the following happens when unbalanced forces act on an object? The object remains stationary. The object moves with the same velocity. The object moves in the direction of the stronger force. The object's speed and direction of motion remain unchanged
The object move in the direction of the stronger force is the answer.
What are balanced and unbalanced forces?balanced force when two individual forces are of the same magnitude and point in opposite directions. We talk about unbalanced forces on an object only if there is a single force of the same magnitude but not balanced by opposite forces.
If the resultant force of all the forces acting on an object is not zero, the forces will be imbalanced. Power. These forces change the stationary state or the uniform movement of the body. Example: Push a toy car lying on the ground and it will start moving with one side force.
The object move in the direction of the stronger force happens when unbalanced forces act on an object
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Read the given list of organisms.
deer, sheep, wolf, cattle, insects
What best describes the role of these five organisms in a food web?
Carnivores, as they all eat meat
Herbivores, as they all feed on plants
Consumers, as they all make their own food
Consumers, as they all obtain food from plants or animals
Answer:
the answer would be B
Explanation:
all the animals are plant eaters or herbivores
Water is formed when two hydrogen atoms bond to an oxygen atom. The hydrogen and the oxygen in this example are different A) complexes. B) compounds. C) elements. AND) mixtures.
Water is formed when two hydrogen atoms bond to an oxygen atom. The hydrogen and the oxygen in this example are different elements. therefore the correct answer is option C.
What is a Chemical compound?A chemical compound is a combination of two or more either similar or dissimilar chemical elements.
For instance, the chemical molecule CO2 is composed of one carbon atom and two oxygen atoms.
As given in the problem statement water is formed when two hydrogen atoms bond to an oxygen atom.
Hydrogen and oxygen are examples of different kinds of elements.
Thus, when two hydrogen atoms join with an oxygen atom, water is created. In this illustration, hydrogen and oxygen are separate elements. the correct answer is option C.
To learn more about a chemical compound, refer to the link;
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PLEASE HELP ASAP
How is science different from other activities involving thought. Give 2-3 sentences to explain why.
Answer:
Science is different from other activities that involve thought because you can create experiments to test any ideas that you have. Another difference is that the government will pay you for being a scientist unlike being a random person with an idea.
Hope this helps/gives you some ideas :)
Explanation:
What has to be true about mass if a small object (like a metal ball) has a high density? A: The mass has to be high compared to the volume. B: The mass has to be low compared to the volume. C: The mass is not related to the density. D: The mass would be determined by throwing the ball in water.
Answer:
the mass must be high compared to the volume
Explanation:
i just took a test and got 100%
Approximately how old is the earth?
A) 4.5 trillion years
B) 4.5 million years
C) 4.5 billion years
D) 4.5 thousand years
Describe a theme-park ride that has constant speed but changing velocity.
Thank you!
What helped provide support for the Plate Tectonic theory in the 1960s?
A) Detailed research of the ocean floor
B) Shape of the continental coastlines matching up together
C) Mountain ranges that seem to match up on different continents
D) Mineral and fossil matches from tests done on different continents
as the moon changes appearance during the month, it follows a pattern. describe the pattern.
Moon can go through phases from quarter to half to three-forth to a full moon.
What is Full moon?When the moon is in its full brightness and its whole disc is illuminated.
The Moon reflects its light from the Sun. Only the part of the Moon that faces the Sun is visible. As the Moon revolves around the Earth, its shadow covers part of its surface. The full moon occurs when the entire moon is visible. A quarter way through the cycle, half of the moon is visible, known as the first quarter. When the Moon seems to disappear, which is known as a new moon or no moon.
Thus, Moon can go through phases from quarter to half to three-forth to a full moon.
Learn more about Full moon.
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Which statement best describes the role of gravity?
It decreases the mass of objects.
It increases the density of objects.
It repels objects in proportion to their temperature.
It draws objects together in proportion to their mass.
How did the mechanical legs using to building robots reassemble the walking motions how are they different
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The many volcanoes located along the edge of the Pacific Ocean make up the Ring of Fire. How does subduction play a role in the volcanic activity in the Ring of Fire? Make a full paragraph!
Answer:
When two plates collides of varying densities, one tends to subduct introducing volcanic material to the earth surface.
Explanation:
The ring of fire is a geographical area where seismic and volcanic activities are prevalent. This region extend around the edge of the pacific plates and including smaller plates like the Juan de Faca plate, coccus plate and the Philippine plate . The ring of fire is a place known for earthquake and volcanism due to the active plate boundary.
The plate boundaries around the rings of fire are known for subduction activities.
Usually, in a convergence boundary where continental crust collides with oceanic crust the more dense oceanic crust tends to subduct. The continental crust is less dense and possess more buoyancy. The less dense and buoyant nature of the continental crust will cause it to override the oceanic crust.
Generally, when oceanic crust and continental crust collides the oceanic crust subduct reaching the aesthenosphere area, Aesthenosphere material like magma are introduced to the earth surface through the subduction zone. The magma may creep through cracks and fissures or erupt to the earth surface. The subduction zone form trenches which is a prerequisite for creating mountains, volcanisms and earthquakes.
make a list of possible consequenes of solar flares to the following members of your community
What is the only truly liquid layer of the earth?
A) inner core
B) outer core
C) lower mantle
D) Upper Mantle
A mouse is moving in a straight line at a steady speed of 2 m/sec for 10 seconds. How far (in meters) did the mouse travel?
When you graph displacement vs. time, velocity is represented by .............................