Lenny wrote the steps he used to find the mass of an object with 400 J of energy moving at a velocity of 8 m/s.
1. Find the square of 8 m/s, which is 64 m2/s2.
2. Divide kinetic energy, 400 J, by 64 m2/s2, which is 6.25 J per m2/s2.
3. Divide 6.25 J per m2/s2 by 2 to get a mass of 3.125 kg.
Which best describes Lenny’s error?
A. In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
B. In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
C. In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 D. m2/s2.
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
Answer:
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
Explanation:
D. In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
What is Kinetic energy?The energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
According to the question,
The object posses an kinetic energy,
Given Mass of an object = 400 J
Energy moving at a velocity= 8 m/s.
[tex]E_k =\frac{1}{2} mv^2\\\\=400J = \frac{1}{2} *m(8)^2\\\\\\=\frac{400J}{64m^2/s^2} = \frac{1}{2}*m\\ \\ =6.25 *2 = m\\\\=12.25 kg[/tex]
Hence,
In the step 3 ,he should have multiplied 6.25 J per m²/s² by 2 instead of dividing it by 2.
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1. A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 high. How far from the base of the cliff does the stone strike the ground?
Answer:
64m away if the horizontal speed does not change
Explanation:
dont skip and pls help ASAP bc if you do i will give 10 pts + brainliest but pls hurry
ANSWER
Mass: The resistance of an object to acceleration, size-dependent
Volume: The amount of space an object occupies
Boiling point: The temperature at which a liquid boils and turns to vapor.
Melting point: The temperature at which a solid melts and turns to liquid
Density: Size-independent
Solubility: The ability of a substance (solvent) to dissolve when placed in a liquid (solute)
Magnetism: Size-dependent
EXPLANATION:
Mass: the more mass something has, the harder it is to accelerate. This is somewhat intuitive, but is also demonstrated in newton's third law. It's size-dependent because for an object of a given density, the size (volume) will change the mass.
Volume: big objects take up more space. If you put an apple in bucket filled to the brim with water, a little water will splash out, because the apple is now occupying the space that the water used to, but if you put in a watermelon, a lot of water will splash out, because the watermelon is taking up even more space.
Boiling point: when a liquid gets too hot, it will change to gas (example: water to steam)
Melting point: when a liquid gets too cold, it will change to a solid (example: water to ice)
Density: how much mass there is in a given volume. A sphere made of lead will have more mass than a sphere made of wood, even if they are the same size. Size-independent because a big lead sphere has the same density as a small lead sphere, they just have different masses.
Solubility: some substances dissolve in certain solvents, other's don't.
Magnetism: size-dependent because a bigger magnet is stronger than a smaller one if they are identical in every other way. More space means more domains means a stronger magnet.
Answer:
i agree
Explanation:
Okay so we are doing an experiment with some fake babies, the teacher gives you the name and you have to pick a nick name, What would be A good nickname for Rita
Answer:
RiRi
Explanation:
Scientific notation 47,000
47,000 written as 4.7 x 104 in s scientific notation
How much energy does a 50kg rock have if it sitting on the edge of a 15m cliff
Answer:
14715 joules
Explanation:
What is meant by the statement that you don’t “own” the atoms that make up your body?
Answer:
there are as many atoms in a normal breath of air as there are breathfuls of air in the atmosphere of the world
Explanation:
Which is not a fundamental force?
A) normal force
B) gravity
C) weak force
D) strong force
Answer:
A
Explanation:
the four fundamental forces are gravity, the weak force, electromagnetism, and the strong force.
A thief throws a ring down at his partner at 4.0 m/s. It is 9.0 m to the partner’s hands.
a) Find the velocity of the ring when the partner catches it.
b) How long will it take for the ring to pass between the two crooks?
Answer:
a) Vf = 13.87[m/s]
b) t = 1 [s]
Explanation:
a)
To solve this problem we can use kinematics equations:
[tex]v_{f}^{2}= v_{i}^{2}+(2*g*h)[/tex]
where:
Vf = final velocity [m/s]
Vi = initial velocity = 4 [m/s]
h = elevation = 9 [m]
g = gravity acceleration = 9.81 [m/s^2]
[tex]v_{f}=\sqrt{(4)^{2} +(2*9.81*9)}\\v_{f}=13.87[m/s][/tex]
b)
Now using the next equation we can find the time
[tex]v_{f}=v_{i} +(g*t) \\t = (13.87-4)/9.81\\t=1[s][/tex]
What is the total energy equation?
Total energy = kinetic energy / potential energy
Total energy = kinetic energy * potential energy
Total energy = kinetic energy + potential energy
Total energy = kinetic energy - potential energy
Answer:kinetic
Explanation:
A baseball is thrown to a height of 10 m and then falls back and is caught. What is the displacement of the baseball for the entire time period described?
a) -10m
b) 0m
c) 10m
d) 20m
Explain one way in which friction actually helps people
Answer:
Friction creates warmth
A proposed solution to a scientific prob-
lem is called a
A hypothesis and/or theory is s a proposed solution to a scientific problem.
A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.
What is scientific hypothesis ?The scientific hypothesis is defined as the relationship between two or more variables or a proposed explanation for some observed process. The scientific hypothesis can happen during scientific experiment.
The good scientific hypothesis may possess a hypothesis must be testable and falsifiable. Someone must be able to test a given hypothesis through scientific experimentation.
A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.
Thus, A proposed solution to a scientific problem is called a hypothesis.
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what are derive quantities
Answer:
Derived quantities are quantities that are calculated from two or more measurements. Derived quantities cannot be measured directly. They can only be computed. Many derived quantities are calculated in physical science. Three examples are area, volume, and density.
Answer:
What is derive quantities?
Derived quantities are those that may be expressed in terms of base or derived quantities by means of the mathematical symbols of multiplication and division only (no addition or subtraction or any other sign). ... The first group consists of derived quantities, which have proper units. Derived quantities are expressed as algebraic combinations of base quantities.
Examples of the Derive quantities
Derive Quantity and their units
Volume, V = m³Density, p = kgm⁻³Velocity, v = ms⁻¹Force, F = NAcceleration, a = ms⁻²What is one other thing that needs to be controlled when testing the effect of particle size?
am sorry i thout this was my question not your answer sorry
temperature of the water must be controlled
According to the FDA, food producers should label their products with the scientific name of the ingredients only.
Answer:
???
Explanation:
What specifically are you asking about
Answer:
no
Explanation:
because , not all the time the buyers can understand the scientific meaning
Which option gives an object's mass in SI units? O A. 8.1 m3 OB. 4.6 lb O C. 5.2 kg O D. 6.5K
Answer:
5.2kg
Explanation:
mass is measured in kilograms
therefore its si unit is kg
Question 3 (1 point)
Select the best answer from the choices below. When the wavelength decreases, the frequency.
a
Increases
Оооо
Decreases
Remains the same
с
d
Stops
Explanation:
the frequency remains the same
What is an astronomical unit?
the average distance between planets in the solar system
the average distance between the Earth and the moon
the approximate diameter of the Sun including its atmosphere
the average distance between the Earth and the Sun
Answer:
D
Explanation:
Introduction This section describes the principles and concepts related to the experiment. It is used to help the person reading your report to understand the information that serves as foundation for the experiment. It also includes a brief statement about the purpose of the lab. Example: Surface tension is the attractive force exerted upon the surface molecules of a liquid by the molecules beneath. Water has a high surface tension because there are strong attractive forces between water molecules. Adding surfactants, like soap, can reduce the surface tension of a liquid. The purpose of the experiment was to determine the effect of soap on the surface tension of water.
Answer:
See explanation
Explanation:
It is a common observation that when water drops on a clean glass surface, it appears as little bags of water.
Surface tension makes water surface act like a stretched elastic skin bag.
Surface tension is caused by attractive forces between the molecules at the surface and the molecules in the bulk of a liquid. Remember that the forces of cohesion between water molecules are very strong.
When surfactants such as soap are added to water, the surface tension of water is decreased, hence the experiment.
Aang and Appa are flying over Ba Sing Se. They covered 500 m in 30 seconds while heading east. What was their velocity?
Answer:
Explanation:
I need help to marysol;)
Which is NOT a symptom of hemophilia:
А.Excessive bleeding
B.Easy bruising
C.Heart attack
D. Joint pain
Answer:
c. heart pain
What did scientists create using scientific measurements?
Answer:
lines?
Explanation:
a car is driven 1.5 kilometers west in 2 minutes. what is the velocity in m/s?
Why do electrons flow in a circuit
Answer:
When a negative charge is brought near one end of a conductor electrons are repelled. ... When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side.
What is the theory for formation of fossil fuel plz help
A:cabon dioxide levels decreased, resulting in nitrogen fixation
B:earth cooled, changing oxygen to carbon
C:fossil fuels are the remnants of organisms that lived a long time ago and were buried, heated, and formed into hydrocarbons
D:fossil fuels arrived on earth from comets and asteroids
Answer:
C.fossil fuels are the remnants of organisms that lived a long time and were buried,heated and formed into hydrocarbons
A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is
Answer:
the answer is 173 m/s
Explanation:
the the sound traveled from the dog to the building and back to the dog in 0.5 seconds, every second passes the sound travels 346 m/s but if half a second passes then we divide 346 by 2 and get 173 m/s.
The difference of two numbers is 28. Find the number if the larger is 3 times smaller.
Answer:
14,42
Explanation:
Let the smaller number be x
Hence, the larger number = 3x
Hence,
[tex]3x-x=28\\2x=28\\x=14[/tex]
Hence, the smaller number = x = 14
The larger number = 3x = 42
100 points
And brainliest
A freeway exit curves with a radius of 30 m and a posted speed limit of 17.5 m/s. What is your radial
acceleration if you take this exit at the posted speed?
Answer:
10.21m/s²
Explanation:
Radial acceleration, also known as centripetal acceleration, refers to the acceleration of an object along the circular radius. It can be calculated using the formula:
a(r) = v²/r
Where a(r) = radial acceleration
v = velocity
r = radius of the circular path
According to the information provided in the question, velocity (v) = 17.5m/s, radius = 30m. Hence;
a(r) = v²/r
a(r) = 17.5²/30
a(r) = 10.208333
a(r) = 10.21m/s²
Lynette has made it to the final round of a tennis tournament. While watching a match between two other players, she attributes her racing heart and rapid breathing to excitement. The next night, just before her own match, she attributes her racing heart and rapid breathing to nervousness. Which theory of emotion best explains this situation?
Answer: D. the Schachter-Singer theory
Explanation:
The Schachter-Singer theory which is also called the Two-factor theory of emotion, explains that humans feel emotion after they appraise the changes in their body in reaction to a stimuli as this would then give them a better means to tell which emotion they are feeling.
Lynette in the first instance noticed she had a racing heart and rapid breathing in response to watching two other players and was then able to appraise this and attribute it to excitement.
When the same thing occurs again but under different circumstances, she is able to appraise it differently and attribute it to nervousness which shows that the Schachter-Singer theory is the relevant theory.