Answer:
42
Explanation:
p=mv
momentum=mass*velocity
x=2.8*15
x=42
In football we see unbalanced forces. When 1 player exerts an unbalanced force on another player and causes a player to
Answer:
Fall
Explanation:
Forces that are equal in size but opposite in direction are called what ?
Answer:
I think they are called balanced forces
Explanation:
which one is correct:
Average acceleration of an object is the:
Change in its position divided by the change in time
Change in time divided by the change in its position
Change in its velocity divided by the change in time
Change in time divided by the change in its velocity
Answer:
Option (c) is correct.
Explanation:
Acceleration of an object is given by the formula as follows :
[tex]a=\dfrac{v-u}{t}[/tex]
Where
u and v are initial and final velocity
t is time
(v-u) is also called the change in velocity
So, the acceleration of an object is equal to the rate of change of velocity. Hence, the correct option is (c) " Change in its velocity divided by the change in time".
A stone is thrown horizontally from a cliff 30m high with an initial speed of 20m/s. How long was the stone in the air before hitting the ground? How far did the rock land from the edge of the cliff?
Answer:
Substitute the numbers for YOUR problem this is NOT the answer.
Explanation:
A snow age is a period of time when much of the Earth’s land is covered in glaciers.
A: True
B: False
A ____________________ is a thick ice mass that moves slowly over the land surface.
The glacial budget is the balance or lack of balance between accumulation at the head of a glacier and loss, or wastage, at the foot
A: True
B: False
Although chemical weathering occurs in deserts, _____________________ is far more dominant in shaping desert landscapes.
An alluvial fan is a fan-shaped deposits of sediments formed when a stream’s slop[e is abruptly reduced
A: True
B: False
A __________________ is a flat area on the floor of an undrained desert basin that fills and becomes a lake after heavy rain.
Wind erodes land surfaces in two ways. Name them!
WIndblown silt can be build up, forming thick deposits called what ?
Which of the following isn’t a real sand dune?
A: barchan dunes
B: latitudinal dunes
C: transversal dunes
D: parabolic dunes
What is known as the vibration of the earth produced by the rapid release of energy within the lithosphere?
A: blizzard
B: mudflow
C: earthquake
The point within earth where an earthquake starts is called the focus
A: True
B: False
_______________ are fractures in earth where movement has occurred
A(n) ________________________ is an earthquake that occurs sometimes soon after the major earthquake.
Foreshocks can happen days, weeks or even months before the major quake
A: True
B: False
Earthquakes produce 2 main types of seismic waves. Name them!
There are 2 types of body waves. Name them!
17. The Greek word “seismo” means what?
18. A seismogram is an instrument that records seismic waves
A: True
B: False
19. A seismograph is the record made by a moment magnitude
A: True
B: False
20. The ____________________ ______________ and the moment magnitude scale
measure earthquake magnitude.
21. If Los Angeles had a moment magnitude reading of 2.5, the results would be?
A: generally not felt
B: rarely felt
C: destructive in built-up areas
22. If New York City had a moment magnitude reading of 5.5, the results would be?
A: generally not felt
B: potentially perceptible
C: can be damaging shocks
23. If E. St. Louis, Illinois had a moment magnitude reading of 6.4, the results would be?
A: generally not felt
B: rarely felt
C: destructive in built-up areas
24. Earthquake -related hazards include seismic shaking, liquefaction. Landslides,
__________________ and tsunamis
25. Define the term, “liquefaction”!
26. A _______________________ is a wave formed when the ocean floor shifts suddenly during an earthquake.
27. The earth’s interior consists of 3 major layers defined by their chemical composition. Name them!
28. Out of these 3 layers of the earth, which is the highest in volume?
29. Which of the following isn’t a real layer of the earth, based on physical properties?
A: lithosphere
B: middle core
C: inner core
30. The outer core is a solid layer of the earth.
A: True
B: False
Answer:
1.true
2.true
3.true
4.d
17to30.
a
d
a
d
a
d
a
d
a
d
a
d
What destructive feature is created by photons?
Answer:
...........................
Which cell structure is the fluid that fills a eukaryotic or prokaryotic cell?
O A) nucleus
OB) cytoplasm
OC) mitochondrion
OD) cell membrane
pleaseeee answer quick
Answer:
the answer would be be B cytoplasm
Draw a graph of these results
Answer:
Actually I know but I can't cause it will take time
How does the abundance of hydrogen and helium support the Big Bang Theory?
It is the proportion predicted to be present in the early universe.
The hydrogen and helium abundance helps us to model the expansion rate of the early universe.
In the abundance of hydrogen and helium, we can say that they account for nearly all the nuclear matter in today's universe.
In big Bang model, the universe is mostly light or protons.
This abundance of hydrogen and helium is consistent with this big bang model. The process of forming this hydrogen and helium is often called big bang nucleosynthesis.The Schramm's model for relative abundances indicate that helium is about 25% by mass and hydrogen about 73% with all other elements constituting less than 2%.
Several proponents of big Bang theory has proposed similar relative abundance for hydrogen and helium. In all it is clear that hydrogen and helium constitute of more than 98% of the ordinary matter in the universe.
Finally, the hydrogen and helium abundance helps us to model the expansion rate of the early universe.
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What kind of food would you expect a turtle with a hard, sharp beak and short neck to eat?
A child cart is given an initial velocity of 8 m/s and undergoes a constant acceleration of 4 m/s2. Calculate the distance moved.
please hellppppp 30points
Answer: This is Yazan From 10-C
Explanation
A jogger runs 6km north, 5km east, then another 4km north. Her average speed is 8 km/h. How long will it take her to complete her run?
Answer:
t = 1.875 hours
Explanation:
Speed
The speed is the rate at which an object moves. If the speed is constant, then the formula to calculate it is:
[tex]\displaystyle v=\frac{d}{t}[/tex]
Where d is the distance traveled in time t.
The jogger runs 6 Km plus 5 Km plus 4 Km north for a total of 15 Km.
It's given her average speed is 8 Km/h. We can calculate the time take to complete the run by solving the above formula for t:
[tex]\displaystyle t=\frac{d}{v}[/tex]
[tex]\displaystyle t=\frac{15\ Km}{8\ Km/h}[/tex]
t = 1.875 hours
4.
Vectors P and Q are drawn to scale.
P
Which diagram represents the vector (P +Q)?
A
B
с
D
plz help I will fail.
can anyone plz help me.
plz
Answer:
hindi ko gets
Explanation:
ang gulo naman nyan
An incident ray of light strikes water at an angle of 30°. The index of refraction of air is 1.0003, and the index of refraction of water is 1.33.
What is the angle of refraction rounded to the nearest whole number?
22°
24°
30°
42°
Answer: It’s A
Explanation:
22 degrees
The angle of refraction rounded to the nearest whole number is 22°.
What is refraction?It is the phenomenon of bending of light when it travels from one medium to another medium. The bending towards or away from the normal depends upon the medium of travel as well as the refractive index of the material.
By using Snell's law,
n₁sin(θ₁) = n₂sin(θ₂)
Where n is the refractive index and θ represents angles
Substituting the respective values given into the equation:
1.0003 * sin(30°) = 1.33 * sin(θ₂)
θ₂= 22°
The angle of refraction rounded to the nearest whole number would be 22°.
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In ultimate the disc may be passed in any direction.
True
False
I think is True: Because...
when you throw a disc you can throw it in any direction, many people call it "Flying Saucer" I'll give you an example ... When you throw something, for example a paper, you want to throw it at your classmate. You already know what address you want to send it to, then I say it is: True ...
Sorry if it's wrong :(
In a vacuum, a 74 gram feather will fall to the Earth at the same rate (acceleration) as a 7.26 kg bowling ball. Which one will hit the ground first? Then use Newton’s 2nd Law of Motion to explain which object (the feather or the bowling ball) experiences a greater force due to gravity.
Answer:
We know that both objects fall at with the same acceleration, let's define that acceleration as g = 9.8m/s^2
Then the acceleration of both objects will be:
A(t) = -9.8m/s^2
Where the minus sign is because the gravity pulls the objects down.
Now, to get the velocity of the objects, we integrate over time, and get:
V(t) = (-9.8m/s^2)*t + v0
Where V0 is the initial velocity of the objects, because we do not have information about this, we can assume that both objects have the same value of V0, so for now, the movement equations are the same for both of them
To get the position we integrate again over time and get:
P(t) = (1/2)*(-9.8m/s^2)*t^2 + v0*t + P0
Where P0 is the initial position and same as above, we can assume that is the same for both objects.
Then both objects have the same motion equations, and the mass does not appear in any of them, then we can conclude that they will hit the ground at exactly the same time, because their motion equations are exactly the same.
B) By Newton's second law we know that:
F = m*a
Force equals mass times acceleration.
We know that both objects suffer the same acceleration, 9.8m/s^2
Then the force for the feather will be:
(remember that 1kg = 1000g, then 74g = (74/1000) kg = 0.074kg)
F = 0.074kg*9.8m/s^2 = 0.7252 N
And for the bowling ball will be:
F = 7.26kg*9.8m/s^2 = 71.148 N
Then you can see that the bowling ball experiences a greater force.
1. explain how the concept of atomic number led to the synthesis of new elements in the laboratory;
Answer:
Because from the atomic number of an element we can predict some of its properties; the properties of elements are a periodic function of their atomic numbers. That is the periodic law which is basically used to synthesize new and understand existing and undiscovered elements
Explanation:
New elements can be formed by bombarding atoms of different chemical elements with ions.
The atomic number also called proton number, refers to the number of protons (positive charge) present in the nucleus of an atom. Each chemical element contains one different atomic number (AN).In the laboratory, chemical elements can be generated by bombarding atoms with ions in order to produce new elements.In conclusion, new elements can be formed by bombarding atoms of different chemical elements with ions.
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What's the difference between speed and velocity
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
if 6.24×10¹⁸ electron pass through a wire in 1s how many pass through it during a time interval of 2hr, 47min and 10s
During a time interval of 2hr, 47min and 10s, 6.25× [tex]10^{28[/tex] electrons pas through the wire.
What is electron?A negatively charged subatomic particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons.
Given parameter:
The electron pass through a wire in 1s = 6.24 × [tex]10^{18}[/tex].
The time interval = 2 hour 47 minute 10 second.
= (2×60×60 + 47×60 +10) second = 1030 second.
Total number of electrons pass through the wire during the time interval = number of electrons pass per second × time interval in second.
= 6.24×[tex]10^{24[/tex]×1030
= 6.25× [tex]10^{28[/tex].
Hence, total number of electrons pass during a time interval of 2hr, 47min and 10s is 6.25× [tex]10^{28[/tex].
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Building contractors often install double-glazed windows to prevent thermal energy (heat) from entering or exiting a building. In addition to being effective insulators, such windows present interesting optical effects.
In the figure, a double-glazed window consists of two identical panes of glass ( g=1.50 ), each g=42.0 mm thick, separated by an air gap of a=33.6 mm . If light incident on the glass makes an angle of =40.00∘ with respect to the glass, find the shift in path Δ as the light enters the room. Use a=1.00 for the index of refraction of air.
Two parallel, horizontal rectangular regions representing glass panes, separated by an open rectangular region representing the air gap between the glass. The thickness of each glass pane is y subscript g. The thickness of the air gap is y subscript a. A light ray is incident upon the upper glass pane, and makes an angle phi with respect to the glass surface. The ray bends downward toward the normal at the air-glass boundary. The ray passes through the glass and strikes the bottom glass-air boundary, where it bends away from the normal and enters the air gap. The beam continues to the second glass sheet, where it once again bends toward the normal at the air-glass boundary. The ray passes through the second sheet and again bends away from the normal at the glass-air boundary. The ray that emerges from the second sheet propagates parallel to a straight line extending the trajectory of the ray incident on the first glass sheet, and is a perpendicular distance delta x away from it.
Δ=
mm
Answer:
x_total = 0.46 cm
Explanation:
Let's analyze this exercise we can calculate the lateral displacement formed by the displacement of the glass plate plus the displacement in the part of air between the glasses.
x_total = d₁ - d₂ + d₃
The sign of displacement in the air is because it reduces lateral displacement.
Let's use the law of refraction to find the angle refracted in the glass, which will determine the displacement
n₁ sin θ₁ = n₂ sin θ₂
where subscript 1 is for the indicating part and subscript 2 for the refracted part (glass)
sin θ₂ = n₁ /n₂ sin θ₁
sin θ₂ = 1 /n_g sin θ₁
for the specific case
sin θ₂ = 1 /1.5 sin 40
θ₂ = sin⁻¹ (0.4285)
θ₂ = 25.37º
so the lateral displacement when exiting the plate is
tan θ₂ = d₁ / y_g
d₁ = y_g tan 25.37
d₁ = 4.20 so 25.37
d₁ = 1.99 cm
when the ray leaves glass and enters the air, it will recover its initial direction, therefore the angle is θ = 40º, the displacement for this part is
tan θ = d₂ / y_a
d₂ = y_a sin θ
suppose that the width is equal to the thickness of the glass y_a = 4.20 cm
d₂ = 4.20 tan 40
d₂ = 3.52 cm
At this time it enters the second glass plate, we see that it is identical to the analysis of the first plate. So the displacement is
d₃ = y_g tan 25.37
d₃ = 4.2 tan 2537
d₃ = 1.99 cm
consequently the total displacement is
general fromula
x_total = 2 y_g tan 25.37 - y_a tan 40
The offset for the given values is
x_total = 1.99 - 3.52 + 1.99
x_total = 0.46 cm
The perpendicular distance delta x away from it will be 0.46 cm.
What is the law of refraction?The incident ray refracted ray, and normal to the interface of two media at the moment of incidence all lie on the same plane,
According to refraction laws. A constant is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Snell's law of refraction is another name for this.
Let's look at this activity in more detail. We can compute the lateral displacement created by the displacement of the glass plate plus the displacement of the air between the glasses.
[tex]\rm x_{total} = d_1 - d_2 + d_3[/tex]
Because it lowers lateral displacement, displacement in the air is an indication. To compute the displacement, we'll utilize the law of refraction to determine the angle refracted in the glass.
[tex]\rm n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
[tex]sin \theta_2 = \frac{n_1}{n_2} sin \theta_1[/tex]
[tex]\rm sin \theta_2 = \frac{1}{15} sin 40^0 \\\\ \theta_2 = sin^{-1}(0.4285) \\\\\ sin \theta_2 =25.37 ^0[/tex]
As a result, while departing the plate, the lateral displacement is;
[tex]tan \theta_2 = \frac{d_1}{y_g} \\\\\ d_1 = y_g tan 25.37^0 \\\\\ d_1 = 4.20 cos 25.37^0 \\\\ d_1= 1.99 cm[/tex]
The ray will revert to its original orientation when it exits the glass and enters the air, therefore the angle is = 40° and the displacement for this section is
[tex]\rm tan = \frac{d_s}{y_a} \\\\\ d_s = y_a sin \theta \\\\[/tex]
Assume that the breadth of the glass is equal to its thickness, y a = 4.20 cm.
[tex]\rm d_2 = 4.20 tan 40^0\\\\ d_2 = 3.52 cm[/tex]
When it reaches the second glass plate, we notice that the analysis is identical to the first plate's. As a result, the displacement
[tex]\rm d_3 = y_g tan 25.37^0\\\\ d_3 = 4.2 tan 2537 \\\\\ d_3 = 1.99 cm[/tex]
Consequently, the total displacement will be;
[tex]\rm x_{total} = 2 y_g tan 25.37^0 - y_a tan 40^0[/tex]
[tex]x_{total} = 1.99 - 3.52 + 1.99\\\\ x_{tota}l = 0.46 \ cm[/tex]
Hence the perpendicular distance delta x away from it will be 0.46 cm.
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A scale reads 184 N when a piece of copper is hanging from it. What does it read (in N) when it is lowered so that the copper is submerged in water?
Answer:
163 N
Explanation:
The density of copper is about 8.96. The ratio of the weight in water to the weight in air is about 1-1/ρ, so is about 0.8884.
0.8884 × 184 N ≈ 163 N
The submerged weight is about 163 N.
What is the name of the phenomenon shown in the picture below?
Answer:
retrograde, so the second answer
Explanation:
i just googled retrograde and the exact picture came up, check if you like
months
a. How long will it take to pay off the debt?
years
b. How much is the total interest paid on the $1,000 debt? $
Answer:
Explanation:
A. Determines on how much dept you got your self into,and if you have a job to help to pay off the credit card dept
B.It could take awhile
Is any force exerted on the vertical sides of the loop that you used in the experiment and how does it affect the apparent mass?
a. There is a force exerted on each side of the loop that are equal in magnitude and opposite in direction.
b. No force is exerted on the sides of the loop.The lengths of the sides of the loop are much smaller than the bottom section and therefore the force on the sides are negligible.
c. The force on the sides are not in the same direction in which the mass is measured and therefore it does not affect the results.
d. The force exerted on the sides of the loop cancel each other out.
The force on the sides is not in the same direction in which the mass is measured and therefore it does not affect the results. Option c is correct.
What is force?Force is defined as the push or pulls applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.
The force on the sides does not alter the results since it is not in the same direction as the mass being measured. The forces acting on the loop's sides cancel one another out.
The force on the sides is not in the same direction in which the mass is measured and therefore it does not affect the results.
Hence option c is correct.
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A typical blood pressure is 120 mm Hg. How high would you need to hang an IV bag so that the fluid enters the blood stream at this pressure? Assume the IV fluid has a density of 1000 kg/m^3.
Answer:
1.63 m
Explanation:
The following data were obtained from the question given above:
Pressure (P) = 120 mmHg
Density (d) = 1000 Kg/m³
Height (h) =?
Next, we shall convert 120 mmHg to N/m². This can be obtained as follow:
760 mmHg = 101325 N/m²
Therefore,
120 mmHg = 120 mmHg × 101325 N/m² / 760 mmHg
120 mmHg = 15998.68 N/m²
Thus, 120 mmHg is equivalent to 15998.68 N/m².
Finally, we shall determine the height to which the IV bag should be placed so that the fluid can enter the blood stream. This is illustrated below:
Pressure (P) = 15998.68 N/m².
Density (d) = 1000 Kg/m³
Acceleration due to gravity (g) = 9.8 m/s²
Height (h) =?
P = dgh
15998.68 = 1000 × 9.8 × h
15998.68 = 9800 × h
Divide both side by 9800
h = 15998.68 / 9800
h = 1.63 m
Therefore, the the IV bag should be placed at a height of 1.63 m
If the forces acting on an object are balanced, what must be true about the motion of this object?
A. It must be moving
B. It must be accelerating
C. It must be changing direction
D. It must have a constant velocity
Answer:
D Constant velocity
Explanation:
if it has forces moving on it it has constant velocity
Calculate the average induced voltage between the tips of the wings of a Boeing 747 flying at 970 km/hr above East Lansing. The downward component of the earth's magnetic field at this place is
This question is incomplete, the complete question is;
Calculate the average induced voltage between the tips of the wings of a Boeing 747 flying at 970 km/hr above East Lansing. The downward component of the earth's magnetic field at this place is 0.7 × 10⁻⁴ T. (DATA: Assume that the wingspan is 60 meters.)
Answer:
the average induced voltage between the tips of the wings of a Boeing 747 flying is 1.132 Volts
Explanation:
Given that;
Speed S = 970 KM/hr
downward component of the earth's magnetic field B = 0.7 × 10⁻⁴
wingspan 1 = 60min
Velocity V = (970 × 10³) / 3600 = 269.44 m/s
So Average Induced Voltage E = VBI
we substitute
E = 269.44 × (0.7 × 10⁻⁴) × 60
E = 1.132 Volts
Therefore the average induced voltage between the tips of the wings of a Boeing 747 flying is 1.132 Volts
An automobile traveling 88.0 km/h has tires of 72.0 cm diameter. (a) What is the angular speed of the tires about their axles
Answer:
angular speed = 67.91 rad/s
Explanation:
Given that,
The diameter of a tire, d = 72 cm
The radius of a tire, r = 36 cm = 0.36 m
Linear speed of an automobile, v = 88 km/h = 24.45 m/s
We need to find the angular speed of the tires about their axles. The relation between angular speed and angular speed is given by :
[tex]v=r\omega\\\\\omega=\dfrac{v}{r}\\\\\omega=\dfrac{24.45 }{0.36}\\\\\omega=67.91\ rad/s[/tex]
So, the angular speed of the tire is 67.91 rad/s.
Some vitamins can not be stored in the body and so they must be replenished by intake on a regular basis. Which of the following is not true about these vitamins?
1 they are water-soluble
2 they need to be taken daily
3 they are fat-soluble
4 They include vitamin C and the B complex vitamins.
Answer:
Explanation:
3
what is environment
Answer:
Explanation:
all biotic and abiotic factors around a living organism is its environment
Answer: An environment is the surroundings or conditions in which a person, animal, or plant lives or operates. the natural world, as a whole or in a particular geographical area, especially as affected by human activity. The best synonym for environment would be nature.
Explanation: Environment is a place where different things are such as a swampy or hot environment. They constantly interact with it and adapt themselves to conditions in their environment. In the environment there are different interactions between animals, plants, soil, water, and other living and non-living things. Environment plays an important role in healthy living and the existence of life on planet earth. Earth is a home for different living species and we all are dependent on the environment for food, air, water, and other needs. Therefore, it is important for every individual to save and protect our environment. To divide environments' sorts we can mention 3 kinds of environments Natural, industrial, and social environment. Natural environment: Include water, light, land, air and all organisms that live in nature.
