Which statement describes an energy measurement?
A. Gravity applies 800 N to a person on Earth's surface.
B. A plane accelerates at 4.1 m/s2
C. An object has a mass of 250 kg.
D. One gram of wood stores 16,000 J.
The statement that describes an energy measurement is one gram of wood stores 16,000 J, therefore the correct answer is option D
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
Thermal energy can be produced with help of various means such as by burning fossil fuels, with the help of solar energy.
The Joule is the recognized unit of measurement for energy (J). Kilowatt/hour (kWh), which is used specifically for electric energy, should be listed among the most used units for measuring energy (in fact it is used to calculate electricity bills). The Terawatt/hour (TWh), or one billion kW/h, is used to calculate the output of big power facilities or the country's consumption.
Thus, The statement that describes an energy measurement is one gram of wood stores 16,000 J, therefore the correct answer is option D
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True or False: Translations are rigid transformations.
Answer:
Explanation:
Yes, translations are rigid transformations. You can verify that the distances between the points are preserved.
Answer:
True
Explanation:
In translation, all points of the figure move the same distance and in the same direction. The shape and size of the image remains the same as the preimage
What is the best use of an atomic model to explain the charge of the particles in Thomason beans
if heat is transferred from gas which could happen
Why would you get a more accurate measure of the volume of an irregular solid by using
displacement instead of measuring with a ruler?
Answer:Displacement method
Explanation:Placing irregular object in a Tube and then measuring the amount of water that either gets displaced from the container or goes up with the creatube and then measuring the amount of water that either gets displaced from the container or goes showing how much volume irregular object is.
In displacement method can be used to accurately measure the volume of oddly shaped objects.
What is the displacement method?The water displacement method can be described as a system of measurements used to find the volume of an object that has an irregular shape. A graduated cylinder will be used to measure the amount of liquid volume an object filled, but it can be done with less scientific techniques.
In order to determine the volume of an irregularly shaped solid, a person can use the water displacement formula. A container of water would require to be measured accurately, and precisely, with a starting volume of water.
Next, the solid will need to be completely submerged underwater, without any part of the object above the water. The water level has risen, and the final volume of the water requires to be recorded. The starting volume of the container requires to be subtracted from the final volume to get the volume of only the object.
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Suppose s(t) is the position of an object moving along a line at time t0. What is the average velocity between the times ta and tb?
Answer:
[tex]V = \frac{s(t_b) - s(t_a)}{t_b -t_a}[/tex]
Explanation:
Given;
position of the object as s(t)
The average velocity is given by;
[tex]V = \frac{s(t_b) - s(t_a)}{t_b -t_a}[/tex]
where;
s(tb) is the object's final position at time tb
s(ta) is the initial position of the object at time ta
tb is the final time of the object's displacement
ta is the initial time of the object's displacement
1. What is the velocity if the displacement is 50 m and the time interval is 10 s?
Answer:
Velocity=5m/s
Explanation:
V=?
S=50m
t=10s
V=S/t
V=50/10
V=5m/s
Which option is part of designing a set of experimental procedures
determining how data will he gathered
Explanation: Apex
Answer:
determining the hypophysis
Explanation:
here you go
Round each of the following to 3 significant figures.
a) 77.0653 g
c) 0.00023350 m
b) 6,310,028.2 mm
d) 10.2030°C
Answer:
a. 77.1 g
b.0.000234 m
c. 6310000 mm
d. 10.2°C
Explanation:
Why do prokaryotic cells usually reproduce more quickly than eukaryotic cells?
Choose 1 answer:
(Choice A) A Eukaryotic cells are more structurally complex than prokaryotic cells.
(Choice B) B Eukaryotic cells have less DNA than prokaryotic cells.
(Choice C) C Eukaryotic cells have more cell walls than prokaryotic cells.
(Choice D) D Eukaryotic cells are smaller than prokaryotic cells.
Prokaryotic cells reproduce more quickly than eukaryotic cells because the latter are more structurally complex. The correct option is A.
Structural complexity of cellsEukaryotic cells have nuclei and membrane-bound organelles such as mitochondrion. This is unlike prokaryotic cells whose DNA lies freely in the cytoplasm and lacks membrane-bound organelles.
In order words, eukaryotic cells are structurally more complex than prokaryotic cells. Thus, reproductive times in prokaryotes are usually quicker than in eukaryotes.
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What happens to the charged electroscope when a conductor is moved between its plastic sheets, and why?
Answer: Please find the answer in the explanation
Explanation:
The question goes thus :
What happens to the charged electroscope when a conductor is moved between its plastic sheets, and why?
When a conductor is moved between its plastic sheets of a charged electroscope, the divergence between the brass plate and the gold leaf will decrease.
And why ?
Because of the unlike charges or neutral uncharged charges between the conductor and the plastic Sheets.
Mad scientists looked at the growth of claw size in mutant lobsters due to drinking different amounts of seawater contaminated with Pepsi. Independent Variable: Dependent Variable: Controlled Variable:
Answer:
Dependent Variable: growth of claw size in mutant lobsters
Independent variable: different amounts of seawater contaminated with Pepsi
Controlled variable: Mutant Lobsters
Explanation:
A dependent variable is one that depends on another factor to get it's result.
An independent variable is one that doesn't rely on another factor/variable to derive it's result.
A controlled variable is one which is constant and remains unchanged throughout the course of the experiment/investigation. Which means it verifies the behavior between the dependent and independent variables.
Now, in the question, the growth of claw size in the mutant lobsters depends on the different amounts of seawater contaminated with Pepsi.
Thus growth of claw size in mutant lobsters is a dependent variable while different amounts of seawater contaminated with Pepsi is an independent variable.
The mutant lobsters would be used throughout the investigation to know the relationship between the dependent and independent variable and wouldn't be changed. Thus, they are controlled variable.
Use the motion map to answer the question, describe the position and velocity of the object based moo the motion map?
Which are characteristics of refraction
Answer:
When light travels from one medium to another, the frequency of light does not change. However, the velocity and wavelength change.
Explanation:
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A stone falls freely from rest for 8.0 s.
a. Calculate the stone's velocity after 8.0 s.
b. What is the stone's displacement during
this time?
a) The acceleration that the stone has is the gravitational acceleration and it is always the same (Actually not but assumed to be so)
The gravitational acceleration is 9.81 m/s²
Since this acceleration is always constant, we can use the formula of V = g × t, where V is velocity, g is the gravitational acceleration and t is time.
Let's use this formula: V = g × t = 9.81 × 8.0 = 78.48 m/s
b) Displacement in free falls is calculated by the formula of d = 1/2 × g × t², which is actually derivated from average velocity.
If we use the formula, d = 1/2 × 9.81 × 8² = is found to be 313.92 m
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A billiard ball moves with 3 kg⋅m/s of momentum and strikes three other billiard balls. What is the total momentum of the balls after the collision?
(1 point)
more than 3 kg⋅m/s
3 kg⋅m/s
It depends on the mass of each ball.
less than 3 kg⋅m/s
A billiard ball moves with 3 kg⋅m/s of momentum and strikes three other billiard balls that have been just sitting there at rest and not moving.
The total momentum of all four balls after the collision is 3 kg⋅m/s, because momentum is not created or destroyed. The total amount of it after an event is the same as the total amount of it before the event.
The momentum of the billiard balls after the collision is 3 Kgm/s.
Let the billiard ball be B.Given the following data:
Momentum B = 3 Kgm/sTo find the momentum of the balls after the collision:
Momentum is simply a multiplication (product) of the mass of an object with its velocity. Also, momentum is a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex]Momentum = Mass[/tex] × [tex]Velocity[/tex]
[tex]Total \; momentum = Momentum \; B + Momentum \;of \;the \;other\; balls.[/tex]
Since the other billiard balls were at rest (not experience any motion), there velocities would be zero (0) m/s.
Substituting the given values, we have:
[tex]Total \; Momentum = 3 + 0[/tex]
Total momentum = 3 Kgm/s.
Therefore, the momentum of the billiard balls after the collision is 3 Kgm/s.
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why sound heard better at night than at day?
Answer:
it is because it is quieter at night than in the daytime. Therefore it is easy to hear the sound far away. However, it is only one of the reasons. Actually, sound transmits farther at night may be related to refraction of sound waves! First, sound is the vibration of air, and it is a kind of wave motion.
Explanation:
Mia is driving at 15m/s. she accelerates for 6sec and reaches 25m/s what is her acceleration
Answer:
1.67m/s²Explanation:
acceleration is the change i velocity with respect to time.
Acceleration = change in velocity/time take
Acceleration = final velocity - initial velocity/time taken
Given initial velocity = 15m/s
final velocity = 25m/s
time = 6sec
Substituting the given value into the formula above to get acceleration
acceleration = 25-15/6
acceleration = 10/6
acceleration = 1.67m/s²
Hence Mia acceleration is 1.67m/s²
Please Help Me with This
Answer:
Explanation:
a). Find the graph attached for the motion.
b). If a shopper walk 5.4 m westwards then 7.8 m eastwards,
Distance traveled by the shopper = Distance traveled in eastwards + Distance traveled westwards
= 5.4 + 7.8
= 13.2 m
c). Displacement of the shopper = Distance walked westwards - Distance traveled eastwards
= 5.4 - 7.8
= -2.4 m
Therefore, magnitude of the displacement of the shopper is = 2.4 m
And the direction of the displacement is eastwards.
any push or pull on an object is called (n)
Answer: Any push/pull on any object is made by a force of some sort.
Explanation:
In physics lab, you measure three quantities: , , and . Suppose that =1.5 kg , =0.4 m , and =3.9 kg/m . Which of the mathematical combinations might be meaningful?
Answer:
1.5 kg is mass, .4 m is volume, and 3.9 kg/m is volume
Explanation:
When looking at these types of problems, consider each part. First, whenever problems have measurements that have similar units of measurement, check if they are density related. In this case, we use the formula of D=M/V, where D stands for density, M stands for mass, and V stands for volume. Any measurements that relate to grams or pounds are mass. In solids, volume is written in cm or m, while in liquid, volume is considered in liters and gallons. Density is always mass divided by volume, so we know that 3.9 kg/m is the density due to the units provided.
What is the number at the end of an isotope’s name?
Explanation:
The liquid contains only one element. -The liquid is a pure substance. The number at the end of an isotope's name is the -mass number. While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group.
katie measured the distance her friend morgan ran on a straight track every 2s. her measurements are recorded in the table below. what was morgan’s average speed? what was her acceleration for the entire trip?
Answer:
The average speed of her is 2 m/s.
The acceleration for the entire trip is 0.2 m/s²
Explanation:
Given that,
katie measured the distance her friend morgan ran on a straight track every 2s.
According to given chart,
We need to calculate the average speed
Using formula of average speed
[tex]v_{avg}=\dfrac{D}{T}[/tex]
Where, D = total distance
T = total time
Put the value into the formula
[tex]v_{avg}=\dfrac{20}{10}[/tex]
[tex]v_{avg}=2\ m/s[/tex]
We need to calculate the acceleration for the entire trip
Using equation of motion
[tex]v=u+at[/tex]
[tex]2=0+a\times10[/tex]
[tex]a=\dfrac{2}{10}[/tex]
[tex]a=0.2\ m/s^2[/tex]
Hence, The average speed of her is 2 m/s.
The acceleration for the entire trip is 0.2 m/s²
What is an example of a concentric contraction
Answer:
an example is a bicep curl
Explanation:
A concentric contraction is a type of muscle activation that causes tension on your muscle as it shortens. As your muscle shortens, it generates enough force to move an object.
two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N
Answer:
team A - team B = 450 N - 415 N
= 35 N
Explanation:
net force on the rope is 35 N and the direction is towards A.since the two teams are pulling away from each other with the given forces, the net force can be calculated by subtracting the forces.
The net force on the rope is 35N in right direction
What is Net Force? The net force is the vector sum of forces acting on an object,How to calculate the Net force?The force applied by Team A is 450N to the right (Given)The force applied by Team B is 415 N to the left (Given)We need to find the Net force applied on the rope and the directionAs We know that ,
[tex]F_{net} = F_1+F_2[/tex]
Now as The direction of the Team A is right so the Force applied will be positive, that is 450N
Simultaneously , The direction of Team B is left so the Force applied will be negative , that is -415N
Here,
F1 = 450N
F2 = -415N
[tex]F_{net} = F_1+F_2[/tex]
= 450+ (-415N)
= 450-415
=35N
Hence the net force applied is 35N and as the net force is positive the direction will be right
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what is meant by pressure?write its unit.
Answer:
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed
Unit: Pascal (Pa)
1Pa = 1N/m^2
When the Moon is a distance of 0.25 D from the Earth, the gravitational force on the Moon from Earth is 16.00 Fm. At what distance with the force on the Moon be 4.00 Fm?
Answer:
When the gravitational force on the Moon from the Earth = 4.00 Fm, the distance of the Moon from the Earth is 0.5·D
Explanation:
The given information includes;
The distance of the moon from the Earth = 0.25·D
The gravitational force, F, on the Moon from the Earth = 16.00 Fm
When the gravitational force on the Moon from the Earth = 4.00 Fm, the distance of the Moon from the Earth is found as follows;
From Newton's law of gravitation;
[tex]F_{1} = F_{2} =G\dfrac{m_{1}m_{2}}{r^{2}}[/tex]
At r = 0.25·D, F = 16.00 Fm
Therefore;
G×m₁×m₂ = (0.25·D)²×16.00 Fm = D²×Fm = Constant
When, the gravitational force of the Moon from the Earth = 4.00 Fm, we have;
[tex]F = 4.00 \ Fm =\dfrac{D^2 \times Fm}{r_2^{2}}[/tex]
Therefore;
[tex]r_2^{2} =\dfrac{D^2 \times Fm}{4.00 \ Fm} = \dfrac{D^2}{4}[/tex]
[tex]r_2 =\sqrt{\dfrac{D^2}{4}} = \dfrac{D}{2} = 0.5 \cdot D[/tex]
r₂ = 0.5·D
Where;
r₂ = The new distance of the Moon from the Earth
Therefore the distance of the Moon from the Earth when the gravitational force on the Moon from the Earth = 4.00 Fm is r₂ = 0.5·D.
What happens when a substance is heated, based on the particles model ( the particles)
Answer:When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
Explanation:
A car travels 500 km at an average speed of 120 m/s. How long will the trip take in hours?
Explanation:
120 m/s × (1 km / 1000 m) × (3600 s / hr) = 432 km/hr
t = (500 km) / (432 km/hr) = 1.16 hr
Which of the following hypotheses is written correctly?*
1.If I heat up a tennis ball it will bounce high.
2.Frozen tennis balls will not bounce as high because they are more dense.
3.If a tennis ball is frozen, it won't bounce as high as one that is not frozen.
4.If I freeze a tennis ball, then it will not bounce as high because the ball is more dense.
Answer:
4 Because Hypothesis sentence always have to be "If" and Then a "then"