Answer:
Explanation:
Earth's atmosphere contains greenhouse gases that trap heat. While they allow sunlight to pass through the atmosphere, they also prevent the heat it brings from leaving it.
If a person has an acceleration of -1.5 m/s/s, then after 3.0 s thier velocity will have changed by m/s. If the initial velocity of the person was 2.0 m/s, then their new velocity is m/s. The initial velocity was in the direction and their final velocity was in the direction, so this person must have turned around during the 3.0 s. The average velocity of the person during the 3.0 s was m/s so their change in position during the 3.0 s must have been m. However, the distance the actual distance they covered was than their change in position because they changed direction.
If the person's initial position was 2.0 m, then their final position will be _____________ m.
Answer:
-1.5 m/s/s + (3.0 s + 2.0 m/s) = -7.5 m/s/s
-7.5 m/s/s x 3.0 s × 3.0 s × 3.0 s = - 202.5
New metals like bohrium our blank or made by people
Assertion: An object will continue moving uniformly on a plane frictionless surface till the resultant force acting on it is Not Zero. Reason: The bodies do not change their state of Rest or uniform motion unless an external unbalanced force acts on it
A body continues in its state of rest until it is acted upon by an unbalanced external force.
According to Newton's first law of motion, the reason for motion is the action of unbalanced forces. A body will continue in its state of rest or uniform motion unless it is acted upon by an unbalanced external force. This law also referred to as the law of inertia.
Hence, an object will continue moving uniformly on a plane friction-less surface till the resultant force acting on it is not zero according to this law. Thus, the reason is an explanation for the assertion.
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[tex]A_x = 5.0[/tex]
[tex]A_y = -6.3[/tex]
Write 1,000,000w
1,000m
0.001 cm using scientific notation
Answer:
1×10^6 w
1×10^3 m
1×10^(-3) cm
You want to determine if three different concentrations (25%, 50%, & 100%) are equally effective at inhibiting the growth of Streptococcus in the antimicrobial assay; which of the following statistical tests would be most appropriate to use? a) Student's paired t-test b) t-test for two independent groups c) Analysis of Variance (ANOVA) d) 2x2 contingency table (Chi-squared test)
Answer:
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In a race, Usain Bolt accelerates at
1.99 m/s2 for the first 60.0 m, then
decelerates at -0.266 m/s2 for the final
40.0 m. What was his final velocity? (Unit = m/s)
một trái banh đỏ được ném lên từ mặt đất với vận tốc ban đầu 25m/s . cùng lúc đó 1 trái banh xanh được thả xuống từ tầng ba của tòa nhả độ cao 15m. hỏi sao bao lâu 2 trái banh đạt cùng độ sao so với mặt đất
Answer:
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Once you start pulling your object With less force than friction, what should you expect your object to do? What about when your object is pulled with more force than friction?
#Case -1
If Pulling force is less than frictional force the object won't move .
#Case-2
If Pulling force is greater than frictional force then object will be .
In order to calculate friction force you need Limiting friction first .
[tex]\\ \sf\longmapsto F_L=\mu sN[/tex]
u s is coefficient of static friction and N is normal reactionWhat is the mass of a truck if it produces a force of 14,000 N while accelerating at a rate of 5m/s2
Answer:
F= mass× acceleration
14000 = mass × 5
mass= 14000÷5
mass= 2800
Each of the rods depicted below were machined from same stock metal. They were originally machined to be the same length, but their cross-sectional areas were different. If axial force is applied to each rod such that they all change length by the same amount, which rod experienced the largest force
The force required to extend a rod increases as the cross sectional area
increases.
The rod that experiences the largest force is rod B
Reason:
The elongation of a rod by the application of a force is given by the
following formula;
[tex]\Delta L = \dfrac{F \cdot L}{A \cdot E}[/tex]
From the above equation, we have that the elongation is inversely
proportional to the cross sectional area, such that the extension of a rod by
a given force reduces as the cross sectional area of the rod increases.
Therefore, the force required to extend the length of a rod by a specific
amount increases as the cross sectional area of the rod increases,
indicating that the rod with the largest cross sectional area require the
most force and therefore, experiences the largest force.
The rod that experiences the largest force is the rod with the largest cross
sectional area, which is rod B
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describe how heat energy can be transferred to either kinetic energy or gravitational potential energy
Answer:
Potential energy can transfer into other forms of energy like kinetic energy. Kinetic energy is energy an object has because of its motion. ... If released, as the ball moves faster and faster toward the ground, the force of gravity will transfer the potential energy to kinetic energy.
On a microscopic scale, conduction occurs as rapidly moving or vibrating atoms and molecules interact with neighboring particles, transferring some of their kinetic energy. Heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another.
In steam engine , pistons remove some heat energy from hot gases and then uses these moving pistons to power the device attached that is hooked up . This is how heat energy can be converted to kinetic energy.
Heat engine with their thermal energy can lift up weights or pumping water to a certain height is an example that how thermal energy can be used to move an automobile to higher altitude .
What is Heat/Thermal energy ?
Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another.
In steam engine , pistons remove some heat energy from hot gases and the steam engine then uses these moving pistons to power the device attached that is hooked up . This is how heat energy can be converted to kinetic energy.
Similarly heat engine with their heat energy can lift up weights or pumping water to a certain height is an example that how heat energy can be used to move an automobile to higher altitude.
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A hypothesis is
a type of research method that involves experimentation
a statement describing the actual outcome of an experiment
the question that forms the foundation for a particular study
a statement describing what the researchers expect to find in a study
Help plz
Answer:
A hypothesis is a tentative statement about the relationship between two or more variables. It is a specific, testable prediction about what you expect to happen in a study.
A hypothesis is a tentative statement about the relationship between two or more variables. is a specific, testable prediction about what you expect to happen in a study.
Explanation:
This is answer
Answer:
hey there
hypothesis is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories
Explanation:
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What is the change in the internal energy of a system that does 400 joules of
work and absorbs 700 joules of heat?
A. -1,100 J
B. 1,100 J
C. 300 J
D. -300 J
Answer:
B
Explanation:
Which of the following correctly identifies the relationship between the immune system and the integumentary system (skin, hair, & nails)?
A
The body releases solid, liquid, and gas pathogens
B
Mucus in the mouth, nose, trachea, and lungs captures pathogens
C
Bones create white blood cells
D
Hydrochloric acid in the stomach dissolves pathogens that are ingested
E
Blood carries white blood cells around the arteries, veins, and capillaries
F
The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens
Answer:
F - The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens
All ball is thrown up with a vertical velocity of 54 m/s and a horizontal velocity of 39 m/s. Calculate how many seconds it will take for it to reach its peak (assume no air resistance). (Answer to two decimal places).
5.5 s
Explanation:
The time it takes for the ball to reach its maximum height can be calculated using
[tex]v_y = v_{0y} - gt \Rightarrow t = \dfrac{v_{0y}}{g}[/tex]
since [tex]v_y = 0[/tex] at the top of its trajectory. Plugging in the numbers,
[tex]t = \dfrac{(54\:\text{m/s})}{(9.8\:\text{m/s}^2)} = 5.5\:\text{s}[/tex]
the speed of the water at the tap of lower storey is more than that in the upper storey,why?
write in one sentence.
Hurry up
With lower, the mechanics have to work harder to give water. Resulting in faster spray. But with upper, they do not have to work as hard which makes it not work as fast.
which of the following is not a pure substance. A. air B. water C. gold D. glucose
Answer:
C. Gold
Explanation:
Why?
Because air , water, glucose is pure substance or liquid
The figure(Figure 1) shows the angular-velocity-versus-time graph for a particle moving in a circle, starting from θ0=0 rad at t=0s. Draw the angular-position-versus-time graph. Include an appropriate scale on both axes.
Answer:
As position is the product of velocity and time, the area under the velocity-time curve will be the position.
Between 2 and 4 s, the area increases linearly to 20(4) = 80
Between 4 and 6 s, the additional area is 0(2) = 0
Between 6 and 8 s the area increases linearly by -10(2) = -20
which is a decrease.
In the angular-position vs time graph; The angular position is derived from the area under the velocity vs time graph
Attached below is the angular position vs time graph
Given that : Angular position = Angular Velocity * time
As Time increases from 0 to 4 secs the area increases from 0 to 80 rad
As Time increases from 4 to 6 secs the area remains constant i.e. 0 rad
As Time increases from 6 to 8 secs the area under the graph decreases 80 to 60 rad
Hence we can conclude that the Angular position of the graph is derived from the area under the velocity vs time graph.
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a student whose mass is 60kg runs up a height of 7.2m in 10.4 seconds find the power used by the student. (g=g.8m/s)
Answer:
p = w/t = mgh/t = 60kg*7.2m*10.4sec/10.4 = 432 watt
If we were to make water (H20) based on the Key Provided above,what would the water molecule look like
Answer:
Individual H2O molecules are V-shaped, consisting of two hydrogen atoms (depicted in white) attached to the sides of a single oxygen atom (depicted in red). Neighboring H2O molecules interact transiently by way of hydrogen bonds (depicted as blue and white ovals).
simple daily routine ? also add habits to make it healthier
1. Can you give an example of any energy transformation where there is no
dissipation of energy?
Answer:
The notable examples are metal bearings, with occasional lumps on the otherwise smooth surfaces catching against each other, and the flow of an electric
Conversions of Kinetic energy to and from potential energy in vacuum converts with very little loss. If you throw a rock up against gravity in a vacuum, that rock will reach a potential energy that is almost exactly equal to the initial kinetic energy. When the rock reaches its peak and comes back down, its kinetic energy will be almost exactly the same when it reaches the original altitude.
How to Convert N/m2 to N/cm2 ?
1 newton / square metre =0.0001 newton / square centimetre
Formula = divide the pressure value by 10000
Pls Help FAST
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Answer:
1. S
2.×
3.×
4.×
I hope this can help u
Por una tuberia de 2.65 cm de diámetro fluye agua con una velocidad de 5 m/s; en una parte de la
tuberia hay una reducción en su diámetro de 0.65 cm. ¿Qué velocidad llevará el agua en este punto?
La ecuación de continuidad podemos encontrar el resultado para la velocidad de fluido en la reducción de la tubería es:
v = 83,1 m/s
La mecánica de fluidos estudia el movimiento de líquidos y gases por diferentes sistemas, la conservación de la masa es escrita como la ecuación de continuidad
A₁ v₁ = A₂ v₂
Donde los subíndices son en dos puntos de interés, A el área de la tubería y v la velocidad del fluido.
Indican la velocidad de fluido es v₁ = 5 m/s y el diámetro de la tubería es d₁= 2,65 cm, piden encontrar la velocidad en la parte con un diámetro de d₂ = 0,65 cm
El área de la tubería es
A = [tex]\pi ^r^2 = \pi \frac{d^2}{4}[/tex]
[tex]v_2 =\frac{A_1}{A_2} \ v_1 \\v_2 = ( \frac{d_1}{d_2} )^2 \ v_1[/tex]
Calculemos
v₂ = [tex]( \frac{2.65}{0.65} )^2 \ 5[/tex]
v₂ = 83,1 m/s
En conclusión usando la ecuación de continuidad podemos encontrar el resultado para la velocidad de fluido en la reducción de la tubería es:
v = 83,1 m/s
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Вариант 3.
1. Можно ли считать Землю материальной точкой при определении длины экватора Земли? Ответ поясните
Answer:
Для ответа на этот вопрос нужно открыть терадочку в том месте, где ты записывала определение материальной точки. На случай, если ты этот момент успешно проспала (что не стало бы сюрпризом), поясню - материальной точкой можно считать тело, размерами которого можно пренебречь. А теперь скажи мне, как можно измерить размер, которым пренебрегаешь?
Why would it be better to record larger forces when trying to determine the frictional coefficient between two objects?
An airplane makes a gradual 90 turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is
Answer:
Explanation:
The plane travels a distance of 200 m/s(20.0 s) = 4000 m
A 90° turn is π/2 radians
4000 = (π/2)R
R = 8000/π m
a = v²/R = 200²/8000/π = 5π m/s² ≈ 15.7 m/s²
When a airplane makes the graduall 90 turn at constant speed the average acceleration is 14.14 m/s.
What is acceleration?Acceleration equals the change in velocity. The rate of change of velocity per unit time is called acceleration. The unit of acceleration is m/s². It represents the speed of the object along with direction.
Acceleration(a) = dv/dt, dv represents change in velocity and dt represents change in time. Velocity is defined as rate of change of position with time. Acceleration has both magnitude and direction and it is a vector quantity.
Acceleration is of two types- Instantaneous acceleration and average acceleration. Instantaneos acceleration gives the acceleration at that instant where as the average acceleration is obtained by rate of change of velocity with elapsed time.
Average acceleration = Δv / Δt. Δv is the change in velocity and Δt is the elapsed time.
From the given,
An airplane makes 90° turn,
v₁ = 200 i^ (before 90 turn)
v₂ = 200 j^ (after 90 turn)
Δt = change in time
Average acceleration = Δv / Δt
= v₂ - v₁ / 20
= 200 i^ - 200 j^ /20
avg.acc = 10(-i) + 10 (j)
| avg.acc | = √ 10(-i) + 10 (j)
= √2×10
= 14.14 m/s²
Hence, the average accleration is 14.14 m/s².
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