Answer:
33m/s to the west
Explanation:
To describe the motion of Jackie you use the simple sum of velocities in a classical frame of reference. First of all you compute the speed of Jackie measured by an observer at rest. This velocity is the difference between the velocity of the bus and the velocity of Jackie because their motion are opposite.
[tex]v_J'=v_B-v_J[/tex]
v'J: velocity of Jackie as seen by an observer at rest
vJ: velocity of Jackie = 2m/s
vB: Bus velocity = 20m/s
By replacing you obtain:
[tex]v_J'=20m/s-2m/s[/tex] = 18m/s
Now, due to the semi-truck is traveling in the same direction of Jackie, you sum this velocities, in order to calculate the velocity of Jackie as seen by the driver in the semi-truck:
[tex]v_J''=v_J'+v_s=18m/s+15m/s=33m/s[/tex]
hence, the driver of semi-truck sees that Jackie is moving with a velocity of 33m/s to the west
From the semi-truck driver's perspective, Jackie Chan appears to be moving 3 m/s to the west, calculated using the principles of relative motion.
Explanation:The question involves analyzing Jackie Chan's motion from the perspective of the driver of the semi-truck in a scene from a fictitious movie. Here's how you can understand this scenario using basic physics principles:
The bus is moving at 20 m/s to the west.Jackie Chan is running at 2 m/s to the east, relative to the bus.The semi-truck is moving at 15 m/s to the east.From the semi-truck driver's perspective, we calculate relative motion to understand how fast Jackie appears to be moving. Since the semi-truck and Jackie are moving in the same direction (east), you subtract the speed of the bus from the sum of Jackie's speed and the truck's speed. The calculation is as follows:
Effective speed of Jackie from the semi-truck = (Jackie's speed + Truck's speed) - Bus's speed
Effective speed of Jackie = (2 m/s + 15 m/s) - 20 m/s = -3 m/s
This means, from the driver's perspective, Jackie appears to be moving 3 m/s to the west, opposite to the semi-truck's direction. The negative sign indicates the direction opposite to the positive convention, which is east in our initial setup.
What is indicated by the slope of an acceleration vs. time graph?
Answer: The velocity of an object
Explanation: The slope of an acceleration vs. time graph is also the velocity of the object.
2.1kilograms into grams (1000g=1kg)
Answer:
2100 grams
Explanation:
You multiply 2.1 kg by 1000
The velocity of an object is the _____ of the object
A. Speed
B. Acceleration
C. Momentum and weight
D. Speed and direction
How can you tell the difference between chemical sedimentary rocks and intrusive
igneous rocks?
Answer:
Sedimentary rocks are usually formed under water when grains of broken rocks are glued together while igneous rocks form when melted rock (magma or lava) cools and metamorphic are rocks that once were igneous or sedimentary rocks but have been changed by pressure and temperature.
Igneous rock is formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks are formed from the products of weathering by cementation or precipitation on the Earth's surface. Metamorphic rocks are formed by temperature and pressure changes inside the Earth.
Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following situation?
You put a heating pad on your back after exercising.
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up
A 2000 kg boat drifts along the waves at a velocity of 3 m/s. What is the kinetic energy of the boat?
9000 J
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightPhysics
SI Units
Energy is in Joules J = 1 Newton per meter N/mMass m is in kilograms (kg)Velocity v is in meters per second m/sEnergy
Kinetic Energy Formula: [tex]\displaystyle KE = \frac{1}{2}mv^2[/tex]
m is massv is velocityKE is kinetic energyExplanation:Step 1: Define
m = 2000 kg
v = 3 m/s
Step 2: Find KE
Substitute [KEF]: [tex]\displaystyle KE = \frac{1}{2}(2000)(3)^2[/tex]Exponents: [tex]\displaystyle KE = \frac{1}{2}(2000)(9)[/tex]Multiply: [tex]\displaystyle KE = (1000)(9)[/tex]Multiply: [tex]\displaystyle KE = 9000[/tex]Which of the following would cause the force of kinetic friction to increase?
O
A. An increase in the normal force
O
B. A decrease in the normal force
O
C. A decrease in Hy
O
D. An increase in us
Answer: an increase in the normal force
Explanation:
Option A : An increase in the normal force
Experimental results have been presented showing that when an elastically soft material slides on a smooth surface, the coefficient of sliding friction increases with speed over a wide range of sliding velocities.
Slip friction is defined as the force acting between moving surfaces. An object moving on the surface receives a force opposite to its direction of motion. The magnitude of the force depends on the coefficient of dynamic friction between the two materials.
Is dynamic friction the same as frictional force?Even if two surfaces pass each other, there may be frictional force between the surfaces, and this sliding friction is called dynamic friction.
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The change of motion of an object depends on ___
A. Both the mass of the object and the size of the force
B. Only the size of the
force on the object
C. Only the weight of the object and the size of the object
D. Only the mass of the object
The change in motion of an object is influenced by both the mass of the object and the size of the force applied to it, as per Newton's second law of motion.
Explanation:The change in motion of an object, also known as acceleration, is dictated by Newton's second law of motion. According to this law, the acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass. Therefore, the correct answer is A) Both the mass of the object and the size of the force. The quantity of the force applied and the mass of the object are both crucial factors that determine the change in an object's motion.
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Directions: Select ALL the correct answers.
Friction is a force that can oppose the motion of two objects that are touching each other. Which of the following are examples of friction?
A. A nail holds two wooden boards together.
B. A parachute softens the landing of a skydiver.
C. A space probe orbits the Moon.
D. The brakes on a bike rub against the wheel.
Climate and weather are related but different. Which of the following describes the climate of a place?
Group of answer choices
Thunderstorms frequently occur in the summer
Fertile soil makes farms in the region very productive.
The temperature dropped below freezing every night last week.
A meteorologist predicts that tomorrow will be sunny and warm.
Climate. What does it mean?
Climate is a long-term weather, or recurring every time. Examples of climate? Every day, the desert is hot the day and cold in the night. This won't change, at least for hundreds, thousands, millions of years. This is climate.
Weather. What does it mean?
Weather is short-term, usually not recurring every time. Examples of weather? Today is very sunny. This will change-for all we know, tomorrow will be cloudy and rainy!
This is why your answer will NOT be a meteorologist predicts that tomorrow will be sunny and warm. This is weather, because it is only tomorrow.
This is why your answer will NOT be fertile soil makes farms in the region very productive. This does not relate to weather, or climate.
This is why your answer will NOT be the temperature dropped below freezing every night last week. This will only be "last week", not the week right now or the week after this week.
Therefore, your answer is "Thunderstorms frequently occur in the summer. This is because that's the climate in that part- thunderstorms always happen.
Brainliest?
Climate refers to long-term weather patterns and conditions experienced in a location. Thunderstorms occurring in the summer and fertile soil making farms productive are not climate indicators. However, dropping temperatures below freezing every night indicates a cold climate, while a sunny and warm prediction suggests a hot climate.
Explanation:The climate of a place refers to the long-term weather patterns and conditions experienced in that location. It is characterized by factors such as temperature, precipitation, humidity, and wind patterns. Of the given options, thunderstorms frequently occur in the summer is more indicative of the weather, rather than the climate. In contrast, fertile soil making farms in the region very productive is not directly related to climate but rather to a region's agricultural potential. However, the temperature dropped below freezing every night last week describes a cold climate, while a meteorologist predicting that tomorrow will be sunny and warm suggests a hot climate.
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when will magnets start moving up or down
Answer:
When there is an opposite to attract to it in the up area.
Explanation:
Humans start from a single cell. Eventually, as cells divide, they start to differentiate, or specialize. Some cells are specialized for movement of the human body. What type cells would these be?
Answer:
interphase im sure
Explanation:
What might happen if transformers didn't exist?
Electricity could not be distributed through power lines to people's homes
The electricity in your house might have an extremely high voltage
The direction of the electric current in your home might switch back and forth
Electricity could not be created at power plants
Answer:
The electricity in your house might have an extremely high voltage
Explanation:
To travel efficitenly elelectricty needs to be at a high voltage and transformers take it town to a resonable level.
What statement is NOT true about fossils?
a.Fossils give us clues about past climate
b.Fossils give us clues about the ground they are formed in
c.Fossils give us clues about surface changes
d.Fossils give us clues about changes in organisms over time
The statement that is not true about fossils is that they give us clues about the ground they are formed in. Option b
Among the given options, the statement that is NOT true about fossils is that fossils give us clues about the ground they are formed in. Fossils indeed give us valuable information about past climates, geological surface changes, and the evolutionary changes in organisms over time. However, the composition or characteristics of the ground in which they're formed isn't typically information that fossils can provide.
Fossils serve as a rich source of data for paleontologists and geologists, often providing insights into major geological events and the past climates on Earth. The fossil record, which consists of all the fossils found on Earth, maps out how life forms have changed over the millennia and reflects the history of life on our planet. Option b
blank is the transfer of thermal energy by collisions between particles
The complete statement is -
Conduction is the transfer of thermal energy by collisions between particles.
What is thermal energy?Thermal energy is the energy that is due to the temperature of the body. The molecules, atoms and ions are in constant motion. When the body is heated, the particles start to move fast enough and collide with the walls. Due to this the temperature of the body rises.
Given is the transfer of thermal energy by collisions between particles.
Conduction takes place more fastly in solids and liquids. This is due to the fact that the particles are a lot closer in them as compared to the gases where the particles are far enough. Therefore, we can complete the blank as follows -
Conduction is the transfer of thermal energy by collisions between particles.
Therefore, the complete statement is -
Conduction is the transfer of thermal energy by collisions between particles.
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When a 5 kilogram mass is
raised vertically
2 meters from the ground, what is its gain in potential energy?
Answer:If a 5-kilogram mass is raised vertically 2 meters from the surface of the Earth, its gain in potential energy is approximately 1) 0 J 2) 10 J 3) 20 J 4) 100 J 43.
Explanation:
The gain of potential energy of the object is 980 joule.
What is potential energy?Potential energy is the energy held by an object as a result of its position relative to other objects, internal stresses, electric charge, or other factors.
The gravitational potential energy of an object, the elastic potential energy of an extended spring, and the electric potential energy of an electric charge in an electric field are all examples of common types of potential energy. The joule, denoted by the symbol J, is the unit of energy in the International System of Units (SI).
Mass of the object: M = 5 kilogram
Vertical distance raised: h = 2 meter.
Acceleration of the gravity: g = 9.8 m/s ².
Hence, its gain in potential energy = Mgh
= 5 kilogram × 2 meter × 9.8 m/s²
= 980 Joule.
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In multicellular organisms, which choice ranks the level of organization from simplest to increasingly more complex?
A.
cells, tissues, organ systems, organs
B.
organs, cells, tissues, organ systems
C.
cells, tissues, organs, organ systems
D.
organs, tissues, organ systems, cells
Answer:
The answer is C.
Explanation:
Cells are the smallest organisms and makes up all living thing or being. The tissues are made of cells. The organs are made of tissues. The organ systems are made of organs. Therefore the order is C. cells, tissues, organs, and organ systems.
How is photon energy calculated? (choose 2)
o Using Plank's constant.
o It cannot be calculated.
o Using the frequency.
How much voltage would be necessary to generate a 10 amps in a circuit with a 5 ohms resistance.
Answer:
Voltage: 50V
Hope this helps
Answer:
50 volts
Explanation:
ohms law is V=IR so take 10 and multiply it by 5 and its 50 volts hope this helps god bless
The current through a device is 0.30 A, and the resistance in the device is 20 many 1.5 V batteries are required to run the device?
Explanation:
V=IR
V=0.3x20
V=6
thus to find the number of 1.5v batteries you divide 6 by 1.5
6÷1.5=4
thus four 1.5v batteries are needed
A longitudinal wave is shown.
Which label identifies a rarefaction?
Answer:
B.
Explanation:
Answer:
B
Explanation: Have a nice day :)
1. Car A has a mass of 8,000 Kg and is traveling at 40 miles per hour. Car B has a mass of 10,000 Kg and is traveling at 40 miles per hour. Which car has more kinetic energy?
Answer:
car B
Explanation:
K.E=1/2mv(squared)
K.E=1/2x10000x40x40
K.E=5000x1600
K.E=8000000J
convert to KJ
K.E=8000000/1000
K.E=8000KJ
A watershed is
a. A building that is close to a water
source.
b. An area where water drains into one
location such as a lake, river or ocean
C. Water that flows over the land surface
from rain, snowmelt, or other sources
d. None of the above
Answer:
B
Explanation:
51. Which two of the resistor arrangements below
have the same equivalent resistance?
112
192
NM
802
812
232
2.2
N
.
W
212
(1) A and B
(2) B and C
(3) C and D
(4) D and A
Answer:
(2) B and C
Explanation:
In B resistors are parallel
so
1/R = 1/R1 + 1/R2
= 1/8+1/8
= 2/8
so
R = 4 ohms
In C resistors are in series
so,
R= R1+R2
= 2+2
= 4
The two resistors with the same equivalent resistance are B and C. So, option 2 is correct.
What is meant by series resistance circuit ?A series resistance circuit is defined as the circuit in which two or more resistances are connected in such a way that the current flowing through all the resistors are the same.
Here,
Two series resistance circuits and two parallel resistance circuits are given.
Calculating the equivalent resistance in each of them.
A) It is a series resistance
R₁ = R₂ = R = 1 Ω
Effective resistance, Reff = R₁ + R₂ = 2R
Reff = 1 + 1
Reff = 2 Ω
B) Parallel resistance circuit
R₁ = R₂ = R = 8 Ω
Effective resistance, Reff = R₁R₂/(R₁ + R₂)
Reff = R/2 = 8/2
Reff = 4 Ω
C) Series resistance circuit
R₁ = R₂ = R = 2 Ω
Reff = 2R = 2 x 2
Reff = 4 Ω
D) Parallel resistance circuit
R₁ = R₂ = R = 2 Ω
Reff = R/2 = 2/2
Reff = 1 Ω
Hence,
The two resistors with the same equivalent resistance are B and C.
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What unit messures amplitude?
Hi there! Hopefully this helps!
-------------------------------------------------------------------------------------------------
The SI system of amplitude is a metre (m).
Nathan holds two magnets near each other. He finds that the magnets stick to each other as shown in this illustration. Magnet A has the poles labelled in the picture. How would you label the poles on Magnet B?
A) Both Point 1 and Point 2 are north poles
B) Both Point 1 and Point 2 are south poles
C) Point 1 is the north Pole and Point 2 is the south Pole.
D) Point 1 is the south Pole and Point 2 is the north Pole.
Answer: D
Explanation: Did the usa prept test yw :)
Answer:
D) Point 1 is the south Pole and Point 2 is the north Pole.
Roshan makes the table below to describe how to draw a ray diagram for a convex lens.
What error did Roshan make?
The ray that goes through the center should bend and go through the focal point on the other side.
The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side.
The ray that goes parallel to the main axis after passing through the lens should also be parallel from the object to the lens.
The rays in the table describe how rays are drawn for a concave lens rather than for a convex lens.
The error that Roshan made is: the rays in the table describe how rays are drawn for a concave lens rather than for a convex lens.
What is lens?A lens is an optical device that is used to focus or diverge light rays through refraction. It is made up of a transparent material, such as glass or plastic, with at least one curved surface.
Roshan's table contained an error because he described the ray diagram for a concave lens rather than a convex lens.
A concave lens's ray diagram differs from that of a convex lens because the concave lens diverges light while the convex lens converges light.
After passing through the lens, the ray should be parallel to the main axis from the object to the lens. This is due to the law of refraction, which states that the incident angle equals the refracted angle.
Thus, Roshan's error was describing the ray diagram for a concave lens rather than a convex lens.
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Roshan's error was in stating that a ray passing through the center of a convex lens should bend and go through the focal point on the other side, which is incorrect as such rays do not change direction.
Roshan's error in describing how to draw a ray diagram for a convex lens is in the statement that 'The ray that goes through the center should bend and go through the focal point on the other side.' In fact, rays that pass through the center of a convex (converging) lens continue in a straight line without bending. The correct rules are:
A ray entering a converging lens parallel to its axis passes through the focal point F of the lens on the other side.A ray passing through the center of either a converging or a diverging lens does not change direction.Therefore, the correct statements for a convex lens would be that a ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side, and that the ray passing through the center of the lens should not deviate from its path.
How would a small bar magnet be oriented when placed at position X
Answer:
D
Explanation:
Well opposites attract, don't they?
A bar magnet at position X will align according to external magnetic fields, typically aligning its north pole towards the geographic North Pole. When experimenting with two magnets, opposite poles attract while like poles repel, which can be visualized with iron filings arranging along a magnetic field.
When a small bar magnet is placed at position X, its orientation will be determined by the external magnetic fields present. If there is no significant external field other than the Earth's magnetic field, a freely suspended bar magnet would align with the Earth's magnetic field lines, where one pole (north-seeking) faces the geographic North Pole and the south-seeking pole faces the geographic South Pole.
However, if we follow instructions similar to those given—placing one bar magnet on the table and bringing the north end of another bar magnet close to the south end of the first, we expect to see attraction between the opposite poles. Conversely, if two like poles are brought close together, they will repel each other. These interactions are due to the magnetic field lines that emerge from the north pole of a magnet and enter at the south pole.
Bar Magnet and Magnetic Field Lines: Utilizing iron filings around bar magnets can visualize these lines. The filings align with the magnetic field, showing the typical dipole pattern. When two bar magnets are placed with the same poles facing each other, the filings will show a pattern indicating repulsion, with field lines diverging. In contrast, when opposite poles are near each other, filings will align to show attraction, with field lines converging.
What happens to a wave when reflected off a node
Which graph above shows the highest pitch?
Answer:
Graph 3
Explanation:
when a wave has a higher pitch, that means it has a higher frequency. Frequency is the number of crests that happen in a certain amount of time and as you can see number 3 has the most crests in that amount of time so its frequency is greater so its pitch is higher