Answer:
i think it is C
Explanation:
Answer: A. Long wire and high temperature
Explanation:
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
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:
The planet most like the earth in size and gravitation is:
Mars
Jupiter
Venus
Pluto
Answer:
Mars
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:
Which one is made up of one or more molecules
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
Which object would a geologist date using carbon-14 dating?
A.a dinosaur fossil
B.a woolly mammoth fossil
C.an ancient volcanic rock
D.an igneous rock
Answer:
B.) A woolly mammoth fossil
Explanation:
Carbon-14 dating is normally used to find the age of a once-living object.
C and D are not accurate because they both refer to types of igneous rocks -- only sedimentary rocks can be used for Carbon Dating.
A isn't accurate because dinosaurs lived a very, very long time ago, therefore, the isotopes wouldn't be detectable during modern times.
Though woolly mammoths lived a long time ago, it is a short time compared to the long time gap between dinosaurs and modern era. Radioactive isotopes may still be present in a woolly mammoth fossil sample.
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
A bowling ball has a mass of 1.7 The ball leaves a bowler's hand at a speed of 7.0 m/s calculate the kinetic energy of the bowling ball (I NEED QUICK ANSWERS PLEASE)
Answer:
the answer is 41.65 J
Final answer:
The kinetic energy of a bowling ball with a mass of 1.7 kg and a velocity of 7.0 m/s is calculated using the kinetic energy formula KE = 1/2 mv^2, resulting in a kinetic energy of 41.65 joules.
Explanation:
The subject of this question is physics, specifically covering the topic of kinetic energy which is a part of mechanical energy. The grade level of this question is high school. To calculate the kinetic energy of the bowling ball, we use the kinetic energy formula:
KE = ½ mv² where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.
Plugging in the given values (mass m = 1.7 kg, velocity v = 7.0 m/s), the calculation is as follows:
KE = ½ × 1.7 kg × (7.0 m/s)²
KE = 0.85 kg × 49 m²/s²
KE = 41.65 joules
So, the kinetic energy of the bowling ball is 41.65 joules.
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.
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.
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
Students created a drawing to represent waves traveling along a slinky spring.
Which of the following accurately describes the properties of a wave if the students decided to increase the energy transmitted by the wave?
A) The frequency of the wave would increase and the wavelength would decreases
B) The frequency of the wave would decrease and the wavelength would increases
Eliminate
C) The frequency of the wave would increase and the wavelength would increases
D) The frequency of the wave would decrease and the wavelength would decreases
Answer:
The answer is A.
Explanation:
Since you're increasing the energy, the frequency would start increasing. The wavelength would start decreasing, since you're putting more energy into the slinky and making it go faster and faster.
I need help fast pleaseeee
I h abitats is a boy or a party for me and you Friday the 13th to make a hoodie is better single
why do scientists use two different models of light
Answer:
To distinguish results based on the only two variables of
awareness.
Explanation:
Final answer:
Scientists use two models of light: the wave model for interference and color observations, and the particle model for emission and absorption processes.
Explanation:
Scientists use two different models of light, namely the wave model and the particle model, because each is useful in explaining different phenomena associated with light.
While the wave model of light is excellent for describing scenarios such as the bending of light around edges, interference patterns, and observations of color, the particle model explains how light is emitted or absorbed by material.
Moreover, ray tracing, a more straightforward approach, is used for predicting images formed by lenses and mirrors, where light is interacting with objects much larger than a wavelength of light.
According to Essential Knowledge 6.F.4, the nature of light requires that different models are most appropriate at different scales. Furthermore, in the realm of quantitative models, a model of light propagation can predict outcomes that are testable and applicable in fields like lithography and sample analyses.
Thus, scientists often select a model based on the scale and context of the phenomenon they are investigating.
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
5. Because velocity is a _____ quantity, ______ matters.
Answer:
First blank is Speed, The Second Blank is Mass
Explanation:
Velocity is always speed and for mass thats just what they taught us>>>
Because velocity is a vector quantity, direction matters.
What is velocity?Velocity is the rate of change of displacement. It is essentially a vector quantity.
Speed of an object moving can never be negative. The velocity of a moving object can be zero.
Speed gives us an idea of how fast an object is moving whereas velocity not only tells us its speed but also tells us the direction the body is moving in.
Initial velocity describes how fast an object travels when gravity first applies force on the object. On the other hand, the final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration.
The motion with constant velocity is the simplest form of motion.
What is vector quantity?Vector is the quantity that has both magnitude and direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
Thus, velocity has speed as well as direction, so it is vector quantity.
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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 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:
What is one difference between an electromagnetic wave and a mechanical wave?
A
An electromagnetic wave can travel through a vacuum. A mechanical wave must have a medium to travel through.
B
An electromagnetic wave moves parallel to the direction of the wave's travel. A mechanical wave can move only perpendicular to the direction of the wave's travel.
C
An electromagnetic wave moves perpendicular to the direction of the wave's travel. A mechanical wave can move only parallel to the direction of the wave's travel.
D
A mechanical wave can travel through a vacuum. An electromagnetic wave must have a medium to travel through.
An electromagnetic wave can travel through a vacuum without a medium, while a mechanical wave requires a medium to propagate. The answer is option D.
One difference between an electromagnetic wave and a mechanical wave is how they propagate through space. An electromagnetic wave can travel through a vacuum without the need for a medium, whereas a mechanical wave must have a medium like air, water, or solids to travel through. This is because electromagnetic waves, which include light waves, are composed of oscillating electric and magnetic fields that can generate each other, whereas mechanical waves, like sound waves, rely on the vibration of particles in a medium to propagate.
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:
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
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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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
A 0.450-kg soccer ball has a kinetic energy of 119 J. What is the velocity of the
soccer ball?
Answer: 23m/s
Explanation:
Given that:
Mass of soccer ball = 0.450kg
kinetic energy = 119 J
velocity of the soccer ball = ?
Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the velocity (v) by which it moves
i.e K.E = 1/2mv^2
119J = 1/2 x 0.450kg x v^2
119J = 0.225kg x v^2
v^2 = 119J / 0.225kg
v^2 = 528.9
To get the value of velocity, find the square root of v
v = √528.9
v = 22.997m/s (Round result to 23)
Thus, the velocity of the soccer ball is 23m/s
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.
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.
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
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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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.