t=5s
it was correct on my do-now
so I hope it was useful for you
Answer:
Time, t = 5 seconds
Explanation:
It is given that,
Initial speed of the bike, u = 8 m/s
Final speed of the bike, v = 14 m/s
Length of the hill, d = 55 m
Firstly, we can find the acceleration of the bike. Let it is equal to a. It can be calculated using third equation of motion as :
[tex]a=\dfrac{v^2-u^2}{2d}[/tex]
[tex]a=\dfrac{(14)^2-(8)^2}{2\times 55}[/tex]
[tex]a=1.2\ m/s^2[/tex]
Let t is the time passes during the descent. It can be calculated using the first equation of motion as :
[tex]t=\dfrac{v-u}{a}[/tex]
[tex]t=\dfrac{14-8}{1.2}[/tex]
t = 5 seconds
So, the time passes during the descent is 5 seconds. Hence, this is the required solution.
Questions
1.1 A rectangular block of wood has dimensions
240 mm x 20.5 cm x 0.040 m. Calculate its
volume in cm
Answer:
1968
Explanation:
2400*20.5*0.004
What force would be needed to make a 10kg bowling ball accelerate down the alleyway with an acceleration of 3m/s2
Answer:
30 N
Explanation:
From Newton's second law:
F = ma
F = (10 kg) (3 m/s²)
F = 30 N
Answer:
F = 30 N
Explanation:
F = (10 kg) (3 m/s²)
F= ma
m= 10 kg
a= 3 m/s^2
How can a global dependence on fossil fuels have associated social costs?
Answer:
Global dependence on fossil fuels has associated social costs.
Explanation:
Increased dependence on fossil fuels reduces their availability. When the demand is high and the availability is low, the price rises. Not every nation would then be able to afford buying fossil fuels at such high costs.
Developing and underdeveloped countries would then be left behind and only the wealthy nations would be able to afford fossil fuel purchase. This would be the immediate impact of global dependence on fossil fuels.
Fossil fuels are mainly coal, petroleum and natural gas. Since fossil fuels are non-renewable in nature over exploitation may lead to fossil fuels getting exhausted.
one car moving in a straight line covers one third distance in 20km/h and rest in 60km/h . find the average speed
Answer:
36 km/h
Explanation:
If d is the total distance, then the time spent driving at 20 km/h is:
t₁ = (d/3) / 20
t₁ = d / 60
And the time spent driving at 60 km/h is:
t₂ = (2d/3) / 60
t₂ = d / 90
So the total time is:
t = t₁ + t₂
t = d/60 + d/90
t = d/36
The average speed is the total distance divided by total time:
s = d / t
s = d / (d/36)
s = 36
The average speed is 36 km/h.
A student pushes a box with a total mass of 50 kg. What is the net force on the box
if it accelerates 1.5 m/s2?
51.5 N.
48.5 N
75N
33.3 N
Answer:
75 N
Explanation:
Apply Newton's second law:
∑F = ma
∑F = (50 kg) (1.5 m/s²)
∑F = 75 N
Which row shows what happens to the temperature of a solid as it melts and what happens to the temperature when
a liquid as it boils?
When ice melts, its temperature doesn't change ... ice at 32 degrees becomes water at 32 degrees.
When water boils, its temperature doesn't change ... water at 212 degrees becomes steam at 212 degrees.
The row that says both of these is row-D .
Why do you float in space
Answer:
because you don't got gravity in space that's why you float in space
Astronauts float in space due to being in a state of free-fall, experiencing weightlessness as a result.
Weightlessness in space occurs because astronauts and their spacecraft are in a state of free-fall, falling towards Earth without resistance. This creates the sensation of weightlessness as everything inside the spacecraft falls at the same rate, hence objects float. Weightlessness in space, often referred to as microgravity or zero gravity, occurs due to the conditions experienced by astronauts and objects in orbit around the Earth or other celestial bodies. Here's a more detailed explanation:
Free-Fall: Objects in orbit around a planet are essentially in a continuous state of free-fall towards that planet. This is because they are moving forward at a sufficient velocity to balance the force of gravity pulling them towards the planet's center. As a result, they are constantly falling towards the planet but are also moving tangentially at a high speed, causing them to continuously miss the planet.
Two 6.0 kg masses are separated by a distance of 4.0 m. What is the magnitude of the gravitational force between the two masses?
Answer: [tex]1.50075*10^{-10}\ N[/tex]
Explanation:
For this exercise we need to use the Gravitational Force Formula. This is:
[tex]F_g=G(\frac{m_1*m_2}{r^2})[/tex]
Where [tex]F_g[/tex] is the gravitational force between two objects, [tex]G[/tex] is the gravitational constant ([tex]G=6.67*10^{-11}\ \frac{Nm^2}{kg^2}[/tex]) and [tex]r[/tex] is the distance between the objects.
We know that:
[tex]m_1=6.0\ kg\\\\m_2=6.0\ kg\\\\r=4.0\ m[/tex]
Therefore, in order to calculate the magnitude of the gravitational force between the two masses, we must substitute these values into the formula.
Then we get:
[tex]F_g=(G=6.67*10^{-11}\ \frac{Nm^2}{kg^2})(\frac{(6.0\ kg)(6.0\ kg)}{(4.0\ m)^2})\\\\F_g=1.50075*10^{-10}\ N[/tex]
Give one advantage and one disadvantage of physical models
Answer:
Advantage of physical model :
Easily understandable. Finding circumstances and end results utilizing model discernibly. Improving framework understanding through a visual examination. Finding mistakes prior and lessening framework surrenders.Disadvantage of physical model :
Time consuming to make. It takes more time to make any physical model. We should be revamped whenever decimated.In terms of saturation (unsaturated, saturated, super-saturated). How would you classify the following?
1. A NaCl solution with a concentration of 50g/100mL of water at 40°C
2. A sugar solution with a concentration of 200g/100mL of water at 40°C
3. A sugar solution with a concentration of 240g/100mL of water at 40°C
Answer:
1. A NaCl solution with a concentration of 50g/100mL of water at 40°C: The NaCl solution with a given concentration is saturated at this temperature .As the temperature increases the solution will more dissolves.
2. A sugar solution with a concentration of 200g/100mL of water at 40°C: The sugar solution with a given concentration is saturated at this temperature. As the temperature increases the solution will more dissolves.
3. A sugar solution with a concentration of 240g/100mL of water at 40°C: The sugar solution with a given concentration is saturated at given temperature.
Final answer:
The NaCl solution is unsaturated, the sugar solution is saturated, and the other sugar solution is supersaturated.
Explanation:
In terms of saturation, a solution can be classified as either unsaturated, saturated, or supersaturated.
The NaCl solution with a concentration of 50g/100 of water at 40°C is unsaturated because it contains less than the maximum amount of solute that can dissolve in the given amount of solvent.The sugar solution with a concentration of 200g/100 of water at 40°C is saturated because it contains the maximum amount of solute that can dissolve in the given amount of solvent.The sugar solution with a concentration of 240g/100 of water at 40°C is supersaturated because it contains more solute than can normally dissolve in the given amount of solvent at that temperature.properties of convex mirror
Answer:
The image result of an object reflected by a convex mirror is typically virtual, upright, and smaller. Discover how moving the object farther away from the mirror's surface affects the size of the virtual image formed behind the mirror
Explanation:
Final answer:
Convex mirrors have specific properties such as a virtual focal point behind the mirror, a negative focal length and power, and they always form virtual, upright, and smaller images compared to the object, which enables a wider field of view.
Explanation:
Properties of Convex Mirrors
A convex mirror, also known as a diverging mirror, has several distinct properties that are useful in various applications, such as security and automotive mirrors. The most notable characteristics of a convex mirror include:
The focal point (F) of a convex mirror is virtual and located behind the mirror.
Parallel rays of light after reflecting off the mirror appear to originate from this focal point.
The focal length (f) and power of a convex mirror are negative because it diverges light rays.
All images formed by a convex mirror are virtual, upright, and smaller than the object, allowing a larger area to be viewed.
Ray diagrams for convex mirrors show that all reflected rays diverge and seem to be coming from a point behind the mirror, creating a virtual image.
This set of properties makes the convex mirror a staple in situations where a wide field of view is crucial, such as security mirrors in stores and side-view mirrors on vehicles.
at what tempreature farenhite scale and celcius scale show the same reading
Answer:
-40°F = -40°C
Explanation:
To convert Celsius to Fahrenheit, the following equation is used:
F = 1.8C + 32
When the temperature on the Fahrenheit scale is the same on the Celsius scale, that means F = C. Substituting:
C = 1.8C + 32
0 = 0.8C + 32
-0.8C = 32
C = -40
Therefore -40°F = -40°C.
Answer:-40°F = -40°C
Explanation:
A ball falls from a height of 25 cm what is the same distance described in meters? Someone help ASAP THIS IS DO TONIGHT
.25 meters
divide the value by 100 to get your answer.
Answer:
Explanation:
im pretty sure its 0.25 because your dividing the 25 cm by 100
A bullet fired straight through a board 0.10 m thick strikes the board with a speed of 480 m/s and emerges with a speed of 310 m .
Part A
What is the x component of the average acceleration of the bullet while in the board? The positive x direction is the initial direction of motion of the bullet.
Express your answer with the appropriate units.
Answer:
Explanation:
givens
vf = 310 m/s
vi = 480 m/s
d = 0.1 m
formula
vf^2 = vi^2 + 2*a*d
Solution
310^2 (m/s)^2 = 480^2 (m/s)^2 + 2 * a * 0.1 meters
96100 = 230400 + 2*a * 0.1
96100 - 230400 = 2*a*0.1
-134300 = 2*0.1*a
-134300 = 0.2 *a
-134300/0.2 = a
a = -671500 m/s^2
The important thing to notice is that the acceleration is minus which means the bullet is slowing down.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
Answer:
Two factors effecting the magnitude of the force of gravity between 2 objects are the product of their masses and square of distance between them.
Explanation:
According to Newton's law of universal gravitation
[tex]F = G\frac{m_{1}m_{2} }{r^{2} } }[/tex]
where F is the gravitational force, G is the universal gravitational constant and its value is 6.6743 × 10⁻¹¹ Nm²/kg₂ , m₁ and m₂ are masses of bodies and r is the distance between them.
It can be seen from the above equation that F is directly proportional to the product of the masses and inversely proportional to the square of distance between them.
F ∝ m₁m₂
F ∝ 1/r²
As far as the masses of the bodies increase, magnitude of the Gravitational force increases and if distance between them increase then Gravitational force between them decreases.
The magnitude of the force of gravity between two objects is affected by the product of their masses and inversely by the square of the distance between them, in accordance with Newton's Universal Law of Gravitation.
Explanation:Two factors that affect the magnitude of the gravitational force between two objects are: the product of their masses (M1 and M2) and the square of the distance (R²) between their centers.
According to Newton's Universal Law of Gravitation, the force of gravity (Fgravity) is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them.
This is mathematically represented as Fgravity = G * (M1 * M2) / R², where G is the constant of proportionality, known as the gravitational constant.
The mass of an object contributes to its gravitational pull; the more mass an object has, the greater its gravitational force. Similarly, distance plays a crucial role; as the distance between objects increases, the force of gravity decreases exponentially.
For example, if the distance between two objects is doubled, the gravitational force between them becomes one fourth of what it was at the initial distance.
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Which of the following best describes gravitational force?
An attraction between two objects that have mass
An attraction between two objects due to their electrons
The force that keeps atoms and molecules bound together
The force that keeps objects from moving when they are at rest
Answer:
2
Explanation:
Answer:
A. An attraction between two objects that have mass
Explanation:
i looked it up lol
What. Is the acceleration of a racing car if it’s speed is decreased uniformly from 66 m/sec to 44 m/sec over an 11 sec period
Answer:
2 m/s²
Explanation:
Acceleration is change in velocity over change in time.
a = Δv/Δt
a = (66 m/s − 44 m/s) / 11 s
a = 2 m/s²
2. Calculate the average magnitude of the force of gravity on the planet Neptune (mass of 1.02*10^ 26 kg) due to the Sun (mass of 1.99*10^ 30 kg) , assuming an average orbital distance of 4.50*10^ 12 m.
Answer:
The answer to your question is: F = 6.69 x 10²⁰ N
Explanation:
To solve this problem we need to use the Newton's law of universal gravitation.
F = G(m1m2)/r²
where
F = ?
G = 6.674×10−11 N · (m/kg)2 is the gravitational constant
m1 = Neptune mass = 1.02 x 10²⁶ kg
m2 = Sun mass = 1.99 x 10³⁰ kg
r orbital distance among the planets = 4.50 x 10¹² m
Substitution
F = 6.674×10−11 N · (m/kg) x 1.02 x 10²⁶ kg x 1.99 x 10³⁰ kg / (4.50 x 10¹² m)²
F = 1.355 x 10⁴⁶ / 2.025 x 10²⁵
F = 6.69 x 10²⁰ N
The average magnitude of the force of gravity on Neptune due to the Sun is approximately [tex]\( 6.714 \times 10^{20} \, \text{Newtons} \).[/tex]
The average magnitude of the force of gravity F on the planet Neptune due to the Sun can be calculated using Newton's law of universal gravitation, which states that the force between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The formula is given by:
[tex]\[ F = G \frac{m_1 m_2}{r^2} \][/tex]
Plugging in the values, we get:
[tex]\[ F = (6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2) \frac{(1.99 \times 10^{30} \, \text{kg}) (1.02 \times 10^{26} \, \text{kg})}{(4.50 \times 10^{12} \, \text{m})^2} \] \[ F = (6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2) \frac{2.03 \times 10^{56} \, \text{kg}^2}{2.025 \times 10^{25} \, \text{m}^2} \] \[ F = 6.697 \times 10^{-11} \times 1.003 \times 10^{31} \, \text{N} \]\\ \[ F \approx 6.714 \times 10^{20} \, \text{N} \][/tex]
6. What is the acceleration of an object that accelerated steadily from rest, traveling 10 m in 10 s?
Answer:
0.2 m/s²
Explanation:
Given:
x₀ = 0 m
x = 10 m
v₀ = 0 m/s
t = 10 s
Find: a
x = x₀ + v₀ t + ½ at²
10 m = 0 m + (0 m/s) (10 s) + ½ a (10 s)²
a = 0.2 m/s²
Why did Aristotle’s theory of everything falling to its “natural place” last more than 1,000 years even though it was incorrect?
No one else pointed out the inconsistencies in the theory.
He had patented the idea and held a copyright on this theory.
The idea of the Sun as the center of the solar system was not yet established.
His framework of thought was very robust, despite the strangeness of his conclusion.
Aristotle's theory of everything falling to its 'natural place' lasted more than 1,000 years for various reasons, including limited scientific knowledge and the robustness of his framework of thought.
Aristotle's theory of everything falling to its 'natural place' lasted more than 1,000 years even though it was incorrect for several reasons. One reason is that no one else pointed out the inconsistencies in the theory, as scientific methods and knowledge were limited during that time. Additionally, the idea of the Sun as the center of the solar system was not yet established, so alternative explanations were scarce. Finally, despite the strangeness of his conclusion, Aristotle's framework of thought was very robust, which may have contributed to the longevity of his theory.
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What is the most critical piece of evidence that is used today in forensics?
Physical evidence is the most critical piece of evidence that is used today in forensics.
Explanation:
Evidence, such as items found on-site, is called physical evidence. The physical evidence is hand prints, footprints, fingerprints, cut marks, tidemarks, tool marks and so on. They are carefully collected and analyzed in the laboratory using forensic methods.
According to criminal law, this physical evidence is the king and not biased. It exists despite all expectations and desires. For this reason, it is very important that physical evidence has to be found, uncontaminated, and properly examined.
Which variable is changed in an experiment?
A. The Stable Variable
B. The Graphing Variable
C. The Independent Variable
D. The Dependent Variable
Answer:The Independent Variable
Explanation: took the test
!!!!!!!!!!!PLEASE HELP!!!!!!!!!!!
Answer: im too young to know
Explanation:
An element with 5 protons 6 neutrons and 8 electron has an mass number of
Answer: The mass is eleven with a negative 3 charge
Explanation:
Add the protons and neutrons. This makes 11. In a stable molecule, the protons and electrons would have the same number, but this is not a stable molecule, so subtract the number of protons from the number of electrons. this makes your negative charge. Electrons are not counted when calculating molecular mass.
An element with 5 protons, 6 neutrons and 8 electrons has a mass number of 11. The mass number is the sum of the protons and neutrons in an atom's nucleus.
Explanation:The concept of the mass number in the realm of atomic structure is indeed a fundamental one, as it serves as a vital identifier for each element. The mass number of an element is the result of adding up the number of protons, which defines the element's identity, and the neutrons, found within the atomic nucleus. This addition yields the overall mass of the atom.
In response to your query, an element characterized by 5 protons and 6 neutrons indeed boasts a mass number of 11. The rationale behind this calculation is rooted in the minute mass of electrons relative to protons and neutrons. Electrons, which orbit the atomic nucleus, make a negligible contribution to the overall mass of the atom. As a result, when determining the mass number, they are rightfully omitted from the equation, and the sum of protons and neutrons stands as the decisive factor.
This core concept of mass number elucidates the distinction between various isotopes of an element, where the number of neutrons may vary, while the number of protons remains constant. It plays a pivotal role in our understanding of atomic structure and the organization of the periodic table, guiding the systematic classification of elements based on their mass characteristics.
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Which type of force will an object move towards?
A) weakest
B) strongest
C) net
D) balanced
Answer:
i think it's weakest
EDIT: It's net. I answered weakest but it was wrong and the correct answer was net. oops
Explanation:
if a strong force is acting on something it will push it away, meaning the object would go towards the weaker force
An object will move towards the strongest force acting on it. Option B is correct.
In physics, the net force on an object determines its motion. The net force is the vector sum of all the individual forces acting on the object. When there is a stronger force in a particular direction compared to the other forces, the object will accelerate in that direction.
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. Mathematically, this can be expressed as
F=ma, where
F is the net force,
m is the mass of the object, and
a is the acceleration.
When multiple forces act on an object, they can either be in the same direction, adding up to create a stronger net force and causing acceleration, or they can be in opposite directions, balancing each other out and resulting in no net force and no acceleration (balanced forces).
In summary, an object will move towards the direction of the strongest force acting on it because that force will result in the greatest acceleration, according to Newton's second law of motion.
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Ann is driving down a street at 64 km/h.
Suddenly a child runs into the street.
If it takes Ann 0.761 s to react and apply
the brakes, how far will she have moved before
she begins to slow down?
Answer in units of m.
Answer:
13.5 m
Explanation:
First, convert km/h to m/s:
64 km/h × (1000 m / km) × (1 h / 3600 s) = 17.8 m/s
Distance = rate × time
d = 17.8 m/s × 0.761 s
d = 13.5 m
Answer:
13.5 m
Explanation:
64 km * 1000 m/km
-----------------------
1 hr * 3600 s/hr
= 17.8 m/s
d = vt
= (17.8 m/s)(0.761 s)
= 13.5 m
A cup of hot water cannot melt a large block of ice. However, the same block melts when dropped into a lake. This is because
(HELP ME PLEASE ;-;) The National Academy of Sciences reported that the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century. This is an example of a change in Earth's
Climate or Weather?
Answer:
Climate
Explanation:
I am pretty sure this is climate because climate is what the temperature over time while weather is what the temperature is today. For example, it may we windy today. That is an example of weather. It is hot in Arizona and Cold in Idaho. This is an example of climate.
Final answer:
The increase of the Earth's surface temperature by about 1 degree Fahrenheit over the past century is an example of a change in Earth's climate, which is a long-term trend, as opposed to weather which is short-term. This change is indicative of global warming and has profound effects on the environment and living organisms.
Explanation:
The National Academy of Sciences report stating that the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century is an example of a change in Earth's climate. This rise in temperature represents a long-term trend that affects ecosystems, weather patterns, and geological processes on a global scale. In contrast, weather refers to short-term atmospheric conditions. The concept of global warming is closely related to this change, as it describes the increase in Earth's average surface temperature due to activities such as burning fossil fuels which release gases that warm the planet. Notably, the increase in global temperatures has implications for habitats, species survival, and agricultural practices. Regional variations in climate change are expected, with some areas, like the Arctic, experiencing more rapid warming.
Dalton’s completing an investigation in the science lab. He observes that a sample of liquid turns to gas at 135°C. What’s this temperature called? A. boiling point B. freezing point C. melting point D. room temperature E. standard temperature
The temperature at which the sample of liquid turns to gas at 135 °C is termed as boiling point.
Answer: Option A
Explanation:
The observation of conversion of liquid to gas indicates that there is occurrence of change in the state of matter. The inter-conversion from one state to another can be done by either varying the temperature or by varying the pressure.
In this case, the liquid on heating gets converted to gaseous state after attaining a particular temperature say 135 °C. So, this process of conversion from liquid to gaseous state on heating is termed as boiling.
The temperature at which a liquid converts to gas is termed as the boiling point of that liquid.
Answer:
option a
Explanation:
A machine lifts a 1000 N object 40 meters in 15 seconds. How much work is done by the machine
Answer:
40000 J or 40 kJ
Explanation:
Work is the net force times the distance.
W = Fd
W = (1000 N) (40 m)
W = 40000 J
Notice that the time doesn't affect the amount of work done.