Answer:
distance=speed×time.
45×20=900m.
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.
The critical angle for refraction from glass to air is 30° and that from water to air is 37°.Find the critical angle for refraction from glass to water.
Answer:
Å
1,55
5 400 Å
n
=
193548,4 km/s
1,55
3 10 m/s
n
c
Vidrio v: =
3 724,14 Å
1,45
5 400 Å
n
=
206 896,5 km/s
1,45
3 10 m/s
n
c
Aceite = v:
07,1
45,1
55,1
n
n
I
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:
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.
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.
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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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:
What forces come in pairs?
Answer:
Newton's Third Law of Motion
Explanation:
it explains that forces always come in action-reaction pairs. The Third Law states that for every action force, there is an equal and opposite reaction force
Answer:
newtons third law of motion
Explanation:
newtons third law of motion explains that forces always come in action-reaction pairs
if the
D=19.3g/cm^3
v= 1.61 cm^3 what is the mass
Answer:
Mass=DV
=19.3g/cm^3 ×1.61cm^3
=31.266g
Explanation:
Mass is the product of an objects density and the space it occupies (volume)
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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this is how Florine appears in the periodic table. which is one best piece of information that "9" gives about an atom of florine? atomic mass is different than atomic number, and the number of neutrons is the difference between the atomic mass and the atomic number.
Answer:
9 is the number of protons in the fluorine atom (atomic number)
Explanation:
Answer:
Atomic number
Explanation:
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.
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
a student places a 13 gram piece of quartz in a graduated cylinder. the water level rises from 30mL to 35mL. what is the density of the quartz
Answer:
2.6 g/cubic centimeter
Explanation:
Given :
Weight of the quartz = 13 gram
Original level of water = 30mL
Level of water after quartz was is placed inside the cylinder = 35 mL
Therefore rise in water = 35 - 30 = 5 mL
We known that 1 mL = 1 cubic centimeter
And density = mass / volume
Therefore, density of the quartz is = 13/5
= 2.6 g/ cubic centimeter
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
how does this explain the action of a bullet fired from a gun.
Answer:
When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is force is called as the action force. The bullet also exerts an equal and opposite force on the gun in the backward direction. Therefore a gun recoils when a bullet is fired from it.
Newton's Laws of Motion and Newton's Law of Gravity explain why?
a) the Earth moves around (orbits) the Sun.
b) the Moon moves around Earth
c) an apple from a tree falls down to ground (as opposed to "rising up into the sky")
d) all of the above
Answer:
D all of the above
Explanation:
This is because newtons laws of motion explains movement of a body due to a force applied while that of gravity explains motion of a body under gravity and this captures a, b, and c
All the given options are following the Newton's laws of motion and Newton's law of gravity separately. All of the above options are correct. Hence, option (d) is correct.
The given problem is based upon the Newton's law of motion as well as Newton's law of gravity. So let us analyze each of the given cases as:
(a)
The Earth moves around the Sun : This statement follows the Newton's first law of motion, which says that an object will continue its state of motion, until any external force is being applied on the object. Since, Earth is offered with no net force. Therefore, Newton's law is applicable.
(b)
Moon movers around Earth: This statement also follows the above explanation for the Newton's first law. Which makes moon to revolve around the Earth on an account of no net force. Hence, it will continue its circular motion and hence Newton's law of motion is followed.
(c)
An apple falls from a tree: This statement is based on Newton's law of gravity, which says that every particle in the universe attracts other particles such that the force of attraction is directly proportional to the product of their masses and inversely proportional to square of distance between them. Since, Earth has more mass than apply, therefore Earth will attract the apple downwards.
Thus, we can conclude that all the given options are following the Newton's laws of motion and Newton's law of gravity separately. All of the above options are correct. Hence, option (d) is correct.
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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
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.
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
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"
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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7.
You run from your house to a friend's house that is 3 miles away. You then walk home.
Answer:
whats the question??????
What is the best use of an atomic model to explain the charge of the particles in Thomason beans
does increase in length affect period T?
Yes,increase in length affects period T.
if heat is transferred from gas which could happen
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:
An object moves, along a line,from point A to B to C and then back to B
again as shown in the figure below in half an hour.
a) find the average speed of the moving object in km/hr.
b) find the magnitude of the average velocity of the object in km/hr
help me pleaseddddd!!!
Answer:
a). Average speed = 26 km per hour
b). Average velocity = 10 km per hour
Explanation:
a). Distance between A to B = 5 km
Distance between B to C = 4 km
Total distance traveled between A to B to C and then back to B
= 5 + 4 + 4
= 13 km
Time taken to cover this distance of 13 km = [tex]\frac{1}{2}[/tex] an hour
Therefore, average speed during this trip = [tex]\frac{13}{\frac{1}{2}}[/tex]
= 26 km per hour
b). Average velocity = [tex]\frac{\text{Displacement}}{\text{Duration}}[/tex]
Displacement = (Distance between A to B) + (Distance traveled between B to C) - (Distance traveled from C to B)
= 5 + 4 - 4
= 5 km towards A
Average velocity = [tex]\frac{5}{\frac{1}{2}}[/tex]
= 10 km per hour
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A plane flies for 2 hours at a speed of 430 km/hr. How far did the plane travel?
Answer:
860km
Explanation:
2× 430 = 860km
the rate is 430km per hr. 2 hours means you multiply by 2
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