A motorcycle travels 15 km west in an hour. The motorcycle then travels 35 km east in another hour. If east is taken as the positive direction, what is the velocity of the motorcycle?
A. -10 km/h
B. 10 km/h
C. 50 km/h
D. -50 km/h
Answer:10km/hr
Explanation:
Displacement=35-10
displacement=20km
Velocity =displacement/time
Velocity =20/2
Velocity =10km/hr
James decides to walk home from school today. He lives 3 miles from school and can walk home in 45 minutes. At what rate is James traveling?
A) 1 mile/10 minutes
B) 1 mile/15 minutes
C) 1 mile/20 minutes
D) 1 mile/30 minutes
A child received a toy train set that moves on a flat track. The child pushed and released the train to move down the tracks, and the train eventually slowed. What is the force responsible for the train slowing to a stop?
A child received a toy train set that moves on a flat track. The child pushed and released the train to move down the tracks, and the train eventually slowed. The force responsible for the train slowing to a stop was :
Friction
Explanation:
Friction is the resistance of motion when one object rubs against another. Anytime two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction. When one object is sliding on another it starts to slow down due to friction.Friction is the force that opposes the relative motion between the two surfaces of objects in contact. The force of friction always acts in the direction opposite to that of the applied force. Since friction is a type of force, it is measured in Newton (N).Friction is responsible for many types of motion. It helps us walk on the ground. Brakes in a car make use of friction to stop the car. Asteroids are burnt in the atmosphere before reaching Earth due to friction. It helps in the generation of heat when we rub our hands.Friction is used in car brakes, when we walk or climb a hill, making a fire, skiing down a hill, and more. Different types of surfaces create different amounts of friction.What factors affect the strength of electronic and magnetic force? Use evidence to support your answer
Answer:
Explanation:
Factors Affecting the Strength of the Magnetic Field of an Electromagnet: Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core
Which of the following is an example of a push?
A. Throwing a baseball
B. Doing chin-ups
C. Reeling in a fish with a fishing pole
D. Opening a car door from the outside.
Answer:
throwing a baseball.
Explanation:
chin ups are also called pull ups
reeling in a fish is pulling it in
opening a car door is pulling it open
someone pls help with question 4
Answer:
given.. mass of copper 2kg
initial temperature is copper(I)=100°cvolume of water(5l)=5kg of waterinitial water temperature =20°cwhat's the final temperature(f)??from the concept
heat lost from an object=heat gained by the other object
Heat=McΔT
Mč x Cč x ΔTč = Mw x Cw x ΔTw
2kg x 385J/kg°C x (100°c - {F}) = 5kg x 4200J/kg°C x ({f} - 20°C)
77000 - 770F = 21000F - 420,000
21770F =497000
....divide both sides....
F=22.83°C
therefore the final temperature of the water was 22.83°C
On the electromagnetic spectrum, the waves with the shortest wavelength have the most energy.
True
False
Answer:
I believe it's True
Explanation:
The shortest the wavelength is the faster the molecules travel producing more energy.
What would happen if you shone a ray of light at right angles to the surface of the glass block?
Answer:
it would reflect at a 90 degree angle
Explanation:
when light is shone onto glass, it will reflect the direction it is facing no matter what. right angles will shine it at a 90 degree angle if you shine light at the exact angle above it
a farmer moves along the boundary of a square field of side 10 m in 40 s.what will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position ?
Answer:
i think 80 m.
Explanation:
una bala de 20 g choca con un fango como se muestra en la figura y penetra una distancia de 6 cm antes de detenerse. calcule la fuerza de frenado f si la velocidad de entrada fue de 80m/s
Answer:
A 20g bullet collides with a mud as shown in the figure and penetrates a distance of 6cm before stopping. calculate the braking force f if the input speed was 80m/s
Explanation:
Given that,
A bullet of mass
M = 20g = 0.02kg
The bullet is fired into a mud initially at rest
The bullet penetrate a distance of 6cm in the mud
S = 6cm = 0.06m
The input velocity into the mud is 80m/s, this implies that, the initial velocity is 80m/s
U = 80m/s
So, the bullet stop after a distance of 6cm, so the final velocity is 0m/s
V = 0m/s
So, we need to find the braking force
Breaking force (F) is given as
F = ma
Where m is mass and 'a' is deceleration
So, we need to find the deceleration, using equation of motion
V² = U² + 2as
0² = 80² + 2 × a × 0.06
0 = 6400 + 0.12a
0.12a = -6400
a = -6400 / 0.12
a = - 53,333.33 m/s²
So, the negative sign shows that the bullet is decelerating
So, a = 53,333.33 m/s²
So, breaking force
F = ma
F = 0.02 × 53,333.33
F = 1066.67 N
The breaking force is 1066.67 N
In spanish
Dado que,
Una bala de masa
M = 20 g = 0.02 kg
La bala se dispara en un lodo inicialmente en reposo
La bala penetra una distancia de 6 cm en el barro.
S = 6 cm = 0.06 m
La velocidad de entrada al lodo es de 80 m / s, esto implica que la velocidad inicial es de 80 m / s
U = 80 m / s
Entonces, la bala se detiene después de una distancia de 6 cm, por lo que la velocidad final es de 0 m / s
V = 0 m / s
Entonces, necesitamos encontrar la fuerza de frenado
La fuerza de ruptura (F) se da como
F = ma
Donde m es masa y 'a' es desaceleración
Entonces, necesitamos encontrar la desaceleración, usando la ecuación de movimiento
V² = U² + 2as
0² = 80² + 2 × a × 0.06
0 = 6400 + 0.12a
0.12a = -6400
a = -6400 / 0.12
a = - 53,333.33 m / s²
Entonces, el signo negativo muestra que la bala se está desacelerando
Entonces, a = 53,333.33 m / s²
Entonces, fuerza de ruptura
F = ma
F = 0.02 × 53,333.33
F = 1066.67 N
La fuerza de ruptura es 1066.67 N
Jackie Chan is filming a stunt for his new movie The Last Emperor of Des Moines. In the scene, Jackie is running across the top of a charter bus as it speeds down the highway directly into the path of an oncoming semi-truck. The bus is traveling at 20 m/s due west, Jackie is running 2 m/s due east, and the semi-truck is traveling 15 m/s due east. Describe Jackie's motion from the perspective of the driver of the semi-truck. Be sure to explain your reasoning.
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 event led to the birth of the sun
Explanation:
A massive concentration of interstellar gas and dust created a molecular cloud that would form the sun's birthplace. Cold temperatures caused the gas to clump together, growing steadily denser, gradually to form the sun.
The birth of the sun and other stars is attributed to a process called stellar nucleosynthesis, which occurs within vast clouds of gas and dust known as nebulae.
What events led to it?The specific event that led to the birth of the sun is commonly referred to as "solar nebula hypothesis" or "solar nebula theory and is based on current understanding and observations of star formation and the early solar system.
The solar nebula hypothesis has it that :
About 4.6 billion years ago, a region of space within the Milky Way galaxy experienced the gravitational collapse of a massive molecular cloud. This molecular cloud was composed mostly of hydrogen and helium, along with trace amounts of other elements.
The gravitational collapse led to an increase in density and temperature at the center of the cloud, resulting in the formation of a protostar.
The protostar is the early stage of the sun, where nuclear fusion reactions have not yet initiated.
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if many household substances classify as acids or bases what is the ph scale
Answer: Some household items that contain acids include: yogurt, vinegar,lemon juice, citric acid, apples, jelly, pineapples, cranberry sauce, milk, and batteries and In chemistry, pH is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. At room temperature, pure water is neither acidic nor basic and has a pH of 7.
(PLEASE HELP) Georgia dropped a glass in the kitchen and it shattered. What happened?
A. A chemical change
B. A physical change
C. A chemical reaction
D. The destruction of matter
Answer:
A physical change
Explanation:
This is a chemical change because, the glass only changed in its form, not its composition. The glass is glass but in a form a shattered pieces of glass. This is not a chemical change because the glass did not change in its composition; this is not a chemical reaction because no other substance caused the glass to break. And, this is not the destruction of matter because matter cannot be destroyed.
The physical change has occurred in the glass dropped by Georgia in the kitchen. Option B is correct.
What is Physical change:The change in the shape, size of the object is considered as the physical change. Chemical change:The change in the constituting chemicals in the matter is called a chemical change. Here, the glass has been dropped and changed in the shape of the glass.Therefore, the physical change has occurred in the glass dropped by Georgia in the kitchen.
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the substance dinitrogen monoxide is a molecule with 3 atoms?
options :
true
false
Answer:
True
Explanation:
You can find it with the abbreviation of N2O
If the force used to push a shopping cart increases, the cart's acceleration will
A) decrease
B) increase
C) remain the same
Answer:
b) increase
Explanation:
What's wrong with the following statement? “The racing car turns around
the corner with a constant velocity of 80 m/s."
Lightning bolts occur when negative charges in clouds:
A. Flow positively to the ground
B. Flows negatively to the ground
C. Flows to the negatively charged clouds
D. cause thunder to sound
Which statement is true about the atom?
A: it contains positive electrons, uncharged protons and negative protons.
B: it contains uncharged neutrons, positive electrons and negative protons.
C: it contains negative electrons, uncharged protons and positive neutrons.
D: it contains negative electrons, positive protons and uncharged neutrons.
E: it contains negative neutrons, positive protons and uncharged electrons.
Answer:
Its d
atome contain
negative electrons,
positive protons and uncharged neutrons.
Explanation:
The correct statement about an atom is option D: it contains negative electrons, positive protons, and uncharged neutrons.
Explanation:Option D accurately characterizes the constituents of an atom, delineating the essential subatomic particles that define its structure. Electrons, carrying a negative charge, orbit the nucleus, which houses positively charged protons and neutrally charged neutrons.
The intricate interplay of these particles governs the atom's overall charge and stability. Understanding this composition is fundamental to delving into the complexities of atomic interactions and the diverse array of elements comprising the periodic table. In essence, the concise yet comprehensive depiction in option D provides a foundational insight into the fundamental components shaping the nature of atoms and their role in the vast landscape of chemistry.
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Which of the following best represents a neutralization reaction?
a) acid + salt > base + water
b) acid + base > salt + water
c) water + salt > acid + base
d) acid + water > base + salt
Answer:
It’s B
Explanation:
Hope it helps
The equation that best represents a neutralization reaction is acid + base > salt + water. The correct option is b.
An acid and a base combine to generate a salt and water in a neutralization process.
Acids are chemicals that emit hydrogen ions (H+) in water, whereas bases emit hydroxide ions (OH-) in water.
When an acid and a base react, the acid's hydrogen ions join with the base's hydroxide ions to generate water (H2O). Simultaneously, the leftover ions from the acid and base combine to create a salt.
Thus, option b) acid + base > salt + water appropriately describes a neutralization reaction in which an acid and a base combine to form a salt and water.
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The angle of incidence is the angle between the WHAT and the normal of the surface?
Answer:incident ray thats the CORRECT ANSWER just did it
Explanation:
A ray diagram without the produced image is shown.
A car acting as an object in front of a biconvex lens between F and 2 F on the object side of the lens. There is a light ray parallel to the principal axis that is bent through F on the image side of the lens. There is a ray straight through the center of the lens. The rays intersect below the x axis further than 2 F away from the lens and farther from the principal axis than the object is tall.
Which describes the image produced by the lens?
upright and real
inverted and real
smaller than the object and upright
smaller than the object and inverted
A car acting as an object in front of a biconvex lens between F and 2 F on the object side of the lens. There is a light ray parallel to the principal axis that is bent through F on the image side of the lens. There is a ray straight through the center of the lens. The rays intersect below the x axis further than 2 F away from the lens and farther from the principal axis than the object is tall.
The image produced by the lens is (b) inverted and real
Explanation:
A real image occurs where the rays converge.
Real images can be produced both by the concave mirrors or converging lenses, but the condition is that the object of consideration is always placed far away from the mirror or the lens than the focal point, and thus the real image produced is inverted.
A car acting as an object in front of a biconvex lens between F and 2 F on the object side of the lens. There is a light ray parallel to the principal axis that is bent through F on the image side of the lens. There is a ray straight through the center of the lens. The rays intersect below the x axis further than 2 F away from the lens and farther from the principal axis than the object is tall.
The image produced by the lens is (b) inverted and real
Answer:
b
Explanation:
edge 2021
On which planet would a 15.0 kg object weigh the most? How much would a 15.0 kg object weigh on that planet? Round the answer to the nearest whole number.
Answer:
The first would be Neptune
then second would be 168
Jupiter planet has the maximum gravitation as compared to other planets. So the 15.0 kg object will weigh the most over there, and its weight on Jupiter will be 36 kg.
What are Planets?The word "planet" has a long history and associations with myth, science, and religion. Many ancient cultures first viewed the planets as divine or as messengers of gods. The human perspective of the planets altered as scientific knowledge increased, encompassing a variety of different objects. A resolution outlining planets in the Solar System was officially accepted by the International Astronomical Union (IAU) in 2006.
Because it excludes numerous objects of planetary mass based on where or what they orbit, this concept has received both acclaim and criticism and is still being contested by some scientists.
According to the question, the given values are :
Mass on earth is 15 kg,
The gravity is 2.4 times of earth on Jupiter planet.
Hence, the weight on Jupiter will be = 2.4 × 15 =36 kg.
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A reference point allows you to determine the _____________ of an object.
Answer:
a reference point allows you to determine the motion of an object :)
example: when your in a car and u look out the window and your moving fast than the car next to you. It seems that way because the car next to you is actually moving much slower.
Final answer:
A reference point is used to determine the position of an object, providing context for its location. A frame of reference builds upon this to include a set of directions, enabling precise measurement of displacement, which includes both magnitude and direction, making it a vector quantity.
Explanation:
A reference point allows you to determine the position of an object. This concept is instrumental when studying motion as it helps to define an object's location in a spatial context. For example, if you wanted to tell a classmate your location in a classroom, you could say that you are 2 meters from the classroom door, directly inside. Here, the classroom door serves as the reference point, and your description of being inside provides a rudimentary coordinate system, defining your position in a one-dimensional space.
A frame of reference is an extension of a reference point, which includes a set of directions to precisely describe the location of an object. In physics, the displacement of an object is defined as the vector that represents the shortest distance from the reference point to the object, providing not only the magnitude of the distance but also its direction.
Choosing different frames of reference can yield the same physical results in a problem. For instance, regardless of whether you are inside a train or standing on a platform, if you take your respective positions as the reference points, the motion observed will be coherent when analyzed from either perspective.
some energy is free but other types must be bought true or false
Answer:
energy is free or can be bought
Explanation:
Its true
Answer:
The correct answer is true!
Explanation:
Have a horse-some day!!!!
-Alaska
Kinetic Energy - What does it depend on?
The greater the ______________ of a moving object, the _____________________ it has.
Help!
Answer:
faster; more kinetic energy
Explanation:
A pendulum completes 30 cycles every minute what is the period of the pendulum?
Answer:
1 cycle every 2 seconds if that is what it is asking.
Explanation:
If a car has a velocity of 40 km/h west and then comes to a stop in 5 s, what is its acceleration in m/s2?
acceleration = change in velocity /change in time
convert 40km to meter then divide it with 5
Acceleration in m/s² is 2.2 m/s²
Given that;Initial velocity of car = 40 km/h
Time taken to stop = 5 s
Find:Acceleration in m/s²
Computation:Initial velocity of car = 40(1000) / [(60)(60)]
Initial velocity of car = 40,000 / 3600
Initial velocity of car = 11.11 m/s
v = u + at
0 = 11.11 + (a)(5)
5a = -11.11
a = 2.2 m/s²
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If a positive metal sphere touches a negative metal sphere what will happen?
What is air resistance a form of? Define air resistance
Answer:
By definition, air resistance describes the forces that are in opposition to the relative motion of an object as it passes through the air. These drag forces act opposite to the oncoming flow velocity, thus slowing the object down.
Explanation:
Air resistance is a form of frictional force that slows down the motion of objects as they travel through the air.
Explanation:In the subject of physics, air resistance is a form of frictional force that slows down the motion of objects as they travel through the air. It is caused by the interaction between the moving object and the molecules in the air.
For example, when an object falls through the air, air resistance acts in the opposite direction of its motion, causing it to fall slower than it would in a vacuum. Similarly, when a car moves forward, it pushes the air in its direction of motion, which creates air resistance that opposes the car's movement.