Answer:
B
Explanation:
Gravity is an invisible force, and so is magnetism and electricity. Friction involves the rubbing of things together to create energy.
Answer:
B
Explanation:
Friction is the force that you feel whenever you try to drag an object across a surface. Like a box along the floor, or your hand across a counter-top. It requires two objects to be in direct contact with each other (don't worry about air friction AKA "drag").
Which of the following statements describes a battery?
Batteries store electric charge.
Batteries use electrolytes and similar metals to produce a flow of electrons.
The negative electrode of a battery has an excess of positive charge.
Batteries convert chemical potential energy into electric energy.
Answer:
Batteries use electrolytes and similar metals to produce a flow of electrons.
Answer:
D. Batteries convert chemical potential energy into electric energy
Explanation:
It was the correct answer on OW
What is the momentum of a 65kg ball rolling at 5 m/s?
Explanation:
Momentum = mass × velocity
p = (65 kg) (5 m/s)
p = 325 kg m/s
Fast please. What is the main source of the sun's energy?
Answer:
radiation
Explanation:
if there was no radiation there would be an iceage
A main goal of most environmental scientists is to achieve _________________________.
Group of answer choices
sustainability
supply and demand
biodiversity
cost-benefit balance
Answer:
The answer is biodiversity
Explanation:
50 POINTS HELP ME PLEASE!!!!!!!!!!!!
Which arrows represent the way a person should go to escape the rip current?
W and X
X and Y
Y and Z
Z and W
Answer:
W and X
Explanation:
When escaping a rip current, one should always walk to the side until you escape from the rip current. If you walk towards the shore, you have the ability to keep getting dragged toward the current, such as with X and Y.
Answer:A
Explanation:
Please help ASAP. Describe the trajectory of a ball in terms of energy.
Answer: A familiar example of a trajectory is the path of a projectile, such as a thrown ball or rock. In a significantly simplified model, the object moves only under the influence of a uniform gravitational force field. ... In this simple approximation, the trajectory takes the shape of a parabola.
Explanation:
Pre-Test: Chemical Bonding
Which type of solid is likely to be the best conductor of electric current?
O ionic compound
O covalent compound
O metal element
O nonmetal element
the air pressure in a car is 210kPa at a temperature of 26°C. What is the temperature of the air in the tyre of the pressure of 220kPa? [assume that the volume of the air in the tyre is constant]
Answer: 313.24K
Explanation:
Given that:
Initial air pressure P1 = 210kPa
Initial Temperature T1 = 26°C
(Since, the SI unit of temperature is Kelvin, convert temperature in celsius to kelvin
26°C + 273 = 299K)
Final temperature T2 = ?
Final pressure P2 = 220kPa
Since, pressure and temperature are involved while volume is constant, apply the formula for pressure law
P1/T1 = P2/T2
210kPa/299K = 220kPa/T2
Cross multiply
210kPa x T2 = 220kPa x 299K
210 x T2 = 65780
T2 = (65780/210)
T2 = 313.24K
Thus, the temperature of the air in the tyre is 313.24K
After a recent experiment, a meteorologist noticed that the computer simulation varied from the actual experiment. What should the meteorologist do?
a: Repeat the experiment several times in order to verify the results
b: Adjust the computer's program so it matches the actual results.
c: Ignore the actual results as inaccurate because computers are very precise
d: Ignore the simulation as inaccurate because of a possible computer virus
Answer:
a: Repeat the experiment several times in order to verify the results
Explanation:
Computer simulations are models. They follow specific instructions and act based on those set of parameters.
Models study a part of the real world and makes useful inference from them. It is often common place to observe discrepancies between computer simulation and what is found in the actual experiment.
The most efficient thing to do is to run and repeat the experiment several times so as to verify the result. It will also help the precision and to know how accurate the readings might be.
Charges
The glass is attracting the pieces of paper. What does
this tell you about the charges on the glass and the
paper
The glass and the paper have the same charge.
The glass and the paper have different charges
Neither the glass nor the paper has a charge
Answer:
B.) The glass and paper have different charges
Explanation:
Answer:
The glass and paper have different charges
Explanation:
did the instruction on edge
Which one is made up of one or more molecules
Electric field lines:
A. always surround a neutron.
B. are visible to the human eye.
C. are bent when two charges interact.
D. always exert attractive forces.
Answer:
A
Explanation:
Answer:
C. are bent when two charges interact.
Explanation:
took the quiz on A p e x
when arti kicks a football two forces interact, arti's foot exerts a force of 5N on the ball. what size force will be exerted on arti's foot?
Answer:
5N
Explanation:
From Newton's third law, we understood that to every action, there is an equal an opposite reaction.
Since Arti's foot exerts a force of 5N on the ball, then, an equal and opposite force of 5N will be exerted on Arti's foot as understood from Newton's third law.
Therefore, a force of 5N will be exerted on Arti's foot.
Two forces interact when Arti kicks a football - Arti's foot exerts a 5N force on the ball, and the ball exerts a 5N force on Arti's foot.
Explanation:When Arti kicks a football, two forces interact - Arti's foot exerts a force of 5N on the ball.
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. So, the ball exerts a force of 5N on Arti's foot in the opposite direction. Therefore, the size of the force exerted on Arti's foot is also 5N.
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Calculate the power provided by a 240 volt, 30 ampere common household dryer.
A) 80w
B) 220w
C) 840w
D) 7200w
Answer:
the answer is D
Explanation:
30-amp 240-volt circuit: 30 amps x 240 volts = 7,200 watts hope this helps
Answer:
I believe the answer is 7200Wats
Explanation: checked the other sources and they didn't match up
he graph shows a marble rolling down a curve from position 1 to position 5. In which position is the potential energy of the marble greatest?
Should be position 1.
a climber has potential energy of 11000 J. If the mass of the climber is 85 determine their height
PLZ HELP ME!!!!!!!!!!!!!!!!
Answer:
12.9m
Explanation:
Gravitational Potential Energy=mass×gravitational
field strength×height
GPE=mgh
11000J=85kg×10N/kg×Height
Height=11000÷850
= 12.9m(to 3s.f)
The climber's height is approximately 13.2 meters.
Using the formula for gravitational potential energy:
PE = mgh, where PE is potential energy, m is mass, g is the acceleration due to gravity (9.8 m/s2), and h is height.
Based on the information provided, the climber has a potential energy (PE) of 11000 J and a mass (m) of 85 kg.
Therefore, we can rearrange the formula to solve for height (h):
h = PE / (mg).
Plugging in the given values gives us
h = 11000 J / (85 kg× 9.8 m/s2), which we can then calculate.
After performing the calculation, the climber's height comes out to be approximately
h = 11000 J / (85 kg×9.8 m/s2)
= 11000 / 833
= 13.2 meters.
A motorcycle is traveling with a velocity of 4 m/s and has a mass of 112 kg
Answer: 896J
Explanation:
Given that
Mass of motorcycle = 112kg
kinetic energy = ?
velocity of the motorcycle = 4m/s
Since kinetic energy is the energy possessed by a moving object, and it depends on the mass (m) of the object and the velocity (v) by which it moves. Therefore, the motorcycle has kinetic energy
i.e K.E = 1/2mv^2
KE = 1/2 x 112kg x (4m/s)^2
KE = 0.5 x 112 x 16
KE = 896J
Thus, the motorcycle has 896 joules of kinetic energy.
What are some of the most common materials that display the photoelectric effect?
Answer:
the so-called alkali metals, the most used of all is potassium
Explanation:
The photoelectric effect is the expulsion of electrons from metals by effect of incident radiation.
To see this effect, materials with a small work function are needed, so the most used materials are the materials of group i of the periodic table, the so-called alkali metals, the most used of all is potassium
In which part of the wave are the particles of the medium closer together?
rarefactions
compressions
solids
liquids
Answer:
compressions
Explanation:
compressions part of the wave are the particles of the medium closer together. Hence option B is correct.
What is wave ?Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.
Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.
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Which of the following is an example of diffraction
A. Hearing a person around a corner before you can see them
B. Seeing a person around a corner before you can hear them
C. A straw in a glass of water appearing "broken"
D. Yelling out in a cave and hearing your voice call back to you
Answer:
the answer would be D. Yelling out in a cave and hearing your voice call back to you
Explanation:
Ice melts to form water. And water freezes to form ice. Choose the TRUE statement about these changes.
A. Both melting and freezing are physical changes.
B. Both melting and freezing are chemical changes.
C. Melting is a physical change while freezing is a chemical change.
D. Melting is a chemical change while freezing is a physical change.
Answer:
A. Both melting and freezing are physical changes
Explanation:
A chemical reaction occurs when there are new properties but the water keeps being water whether it is freezed or liquid so is not a,c,d.
A physical change occurs when the substance changes its state but no its components or properties so is A is the correct answer.
The true statement is A. Both melting and freezing are physical changes because the substance's composition remains H2O, and only its state changes.
When ice melts to form water or water freezes to form ice, the physical state of water changes from solid to liquid or vice versa, but the composition of water remains the same. This means that the molecules are not changed chemically.
Melting is when a solid becomes a liquid by absorbing heat or ambient temperature increases, during which its shape can change, but its composition does not. Freezing is the reverse process, where a liquid turns into a solid as it loses heat. Both processes are reversible, meaning you can switch from one state to another without altering the chemical identity of the substance. This marks the key characteristic of a physical change.
If a polar bear runs at a speed of about 8.3 m/s, how far will it travel in 10.0 hours
Answer: 298800 metres
Explanation:
Given that:
speed of polar bear = 8.3 m/s
Distance traveled = ?
Time taken = 10.0 hours
Since the SI unit of time is seconds, convert time in hours to seconds
1 hour = 60 minutes & 1 minute = 60 sec
So, 10.0 hours = (10 x 60 x 60)
= 36000 seconds
Apply the formula:
speed = distance traveled / time taken
8.3 m/s = distance traveled / 36000 seconds
Distance traveled = 8.3m/s x 36000 sec
= 298800 metres
Thus, the polar bear traveled 298800 metres.
a proton is placed 100 micrometers from a helium nucleus. Gravity pulls the proton and nucleus together, while the electric force pushes them apart. Which is stronger, and by how much?
Answer:
The electric force is [tex]6.2\cdot 10^{35}[/tex] times stronger than the gravitational force
Explanation:
The magnitude of the electrostatic force between two charges is given by:
[tex]F_E=k\frac{q_1 q_2}{r^2}[/tex]
where:
[tex]k=8.99\cdot 10^9 Nm^{-2}C^{-2}[/tex] is the Coulomb's constant
[tex]q_1, q_2[/tex] are the two charges
r is the separation between the two charges
In this problem:
[tex]q_1=1.6\cdot 10^{-19}C[/tex] (charge of the proton)
[tex]q_2=3.2\cdot 10^{-19}C[/tex] (charge of a nucleus of helium, twice the charge of a proton)
[tex]r=100 \mu m = 100\cdot 10^{-6} m[/tex]
So the electric force is
[tex]F_E=(8.99\cdot 10^9)\frac{(1.6\cdot 10^{-19})(3.2\cdot 10^{-19})}{(100\cdot 10^{-6})^2}=4.6\cdot 10^{-20} N[/tex]
Instead, the magnitude of the gravitational force between two objects is given by :
[tex]F_G=G\frac{m_1 m_2}{r^2}[/tex]
where
[tex]G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}[/tex] is the gravitational constant
m1, m2 are the masses of the two objects
r is the separation between them
Here we have:
[tex]m_1=1.67\cdot 10^{-27}kg[/tex] is the mass of the proton
[tex]m_2=6.68\cdot 10^{-27}kg[/tex] is the mass of a nucleus of helium (4 times the mass of the proton)
[tex]r=100 \mu m = 100\cdot 10^{-6} m[/tex] is the separation
So the gravitational force is
[tex]F_G=(6.67\cdot 10^{-11})\frac{(1.67\cdot 10^{-27})(6.68\cdot 10^{-27})}{(100\cdot 10^{-6})^2}=7.4\cdot 10^{-56} N[/tex]
So, we see that the electric force is much stronger than the gravitational factor, by a factor of:
[tex]\frac{F_E}{F_G}=\frac{4.6\cdot 10^{-20}}{7.4\cdot 10^{-56}}=6.2\cdot 10^{35}[/tex]
What is the description of destructive interference between two light waves
Answer:
Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.
Scientists were studying three different embryos to determine their relationship to humans. The notes about each embryo are shown in the chart. Based on the information, what can you determine? Species A and B are related to humans. Species A and C are related to humans. Species B and C are not related to humans. Species A and C are not related to humans.
Answer:
yes B is correct
Explanation:
Species A and C are related to humans. Therefore, the correct option is option B among all the given options.
What is embryos?A multicellular organism's embryo is the first stage of development. In sexually reproducing animals, gametophyte is the stage of the life cycle which thus begins immediately after implantation of both the female egg cell even by male sperm cell.
The resultant merger of these two cells results in a single-celled zygote which divides into cells are known as blastomeres. Species A and C are related to humans.
Therefore, the correct option is option B.
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The planet most like the earth in size and gravitation is:
Mars
Jupiter
Venus
Pluto
Answer:
Mars
Explanation:
a father has brown hair (B), but the offspring have red hair (a recessive trait), like their mother (b). How is this possible?
Answer:yes it is possible
Explanation:it is possible because when you add both of them it becomes red
Answer: the mother has bb (or red) hair.
Explanation:
The mother is red headed. So, a Bb brown haired father and a bb red headed mom gave their child bb (recessive) traits. When shown in a punnet square, bb is an option.
An ion contains 8 protons, 10 electrons, and 7 neutrons. What is the mass of the ion?
Answer: 15
Explanation:
The mass of the ion is the sum of the protons and neutrons inside its nucleus.
i.e Mass number = protons + neutrons
Mass number = 8 protons + 7 neutrons
= 15
Furthermore, since the number of protons differ from the number of electrons by 2, the ion was formed when its atom gained 2 electrons. Thus, it is a negatively charged ion (anion) with a mass of 15
True or False? Sometimes, substances can be added to a reaction to cause the reaction to start or speed up. These are not considered reactants or products. They are called CATALYSTS.
A) True
B) False
Answer:
A catalyst is a chemical substance that affects the rate of a chemical reaction by altering the activation energy required for the reaction to proceed. This process is called catalysis. A catalyst is not consumed by the reaction and it may participate in multiple reactions at a time.
Explanation:
a
why was the geocentric model of the solar system accepted by scientist for many years?
The geocentric model of the solar system was accepted because it made sense based on observations at the time. The heliocentric model became accepted later thanks to the work of Copernicus and Galileo.
Explanation:The geocentric model of the solar system was accepted by scientists for many years because it appeared to make sense based on the observations at the time. In the geocentric model, Earth was believed to be at the center of the universe, with the planets and the Sun orbiting around it. This model was supported by the apparent motion of the celestial bodies in the sky.
For centuries, people observed that the Sun appeared to rise in the east and set in the west, while the planets seemed to move across the sky in different paths. The geocentric model provided a simple explanation for these observations. Additionally, there was a lack of evidence at the time to support an alternative model.
It was not until the 16th century, with the work of Nicolaus Copernicus and later Galileo Galilei, that the heliocentric model of the solar system started gaining acceptance. The heliocentric model, with the Sun at the center, provided a more accurate explanation for the motion of the planets, as well as other astronomical phenomena. The development of telescopes and advancements in observations also contributed to the acceptance of the heliocentric model.
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The geocentric model was accepted for years due to its ability to predict planetary motions and its alignment with religious and philosophical beliefs.
The geocentric model, which positioned Earth at the center of the universe, was accepted by scientists and scholars for many years due to a combination of observational, philosophical, and religious reasons.
Even when Greek astronomers suggested that it was more natural for smaller objects to revolve around larger ones, the Ptolemaic model persisted because it was able to predict planetary motion with reasonable accuracy through complex mechanisms like epicycles and deferents.
The geocentric model was further reinforced by the fact that it was embedded in the teachings of the Church, and the heliocentric idea faced significant resistance due to the societal and theological implications of displacing Earth from the cosmic center.
It was not until the works of astronomers such as Copernicus, Brahe, Kepler, and Galileo provided substantial evidence that the heliocentric model began to gain acceptance over the geocentric model.