Answer:
Fats can be identified with a paper without any chemical. Just the food sample in Fats should be placed on the first paper than the rest three papers should be placed on and if any marks are there that shows the quantity of presence in Fats.
Explanation:
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A test car carrying a crash test dummy accelerates from 0 to 30 m/s and then crashes into a brick wall. Describe the direction of the initial acceleration vector and compare the initial acceleration vector’s magnitude with respect to the acceleration magnitude at the moment of the crash. [*** DRAW A DIAGRAM ***]
Answer:
the direction of acceleration of the vehicle is the same direction of its velocity of car
s acceleration has the opposite direction to the car speed.
Explanation:
The initial acceleration of the car can be calculated with
v = v₀ + a t
a = (v-v₀) t
indicate that the initial velocity is zero (v₀ = 0 m / s)
a = v / t
a = 300 / t
the direction of acceleration of the vehicle is the same direction of its acceleration movement.
When the car collides with the wall, it exerts a force in the opposite direction that stops the vehicle, therefore this acceleration has the opposite direction to the car speed. But your module must be much larger since the distance traveled to stop is small
Select the correct answer.
Matthew uses the combine harvester to harvest his crops. Which PPE should Mathew use?
А. сар
B.
earmuffs
C. gloves
D. respirator
E. safety glasses
Answer:
Matthew should use the safety glasses as his PPE.
Explanation:
HEY CAN ANYONE PLS HELP ME IN DIS! Which prefix represents a unit that is larger than "centi-" ? a. "nano-" b. "pico-" c. "milli-" d. "deci-" e. "micro-"
exlpain the process of harvesting
Answer:
harvesting is a proscess of gathering a ripe crop from the fileds
Explanation:
The model below shows a calcium atom. An image has a mix of red and blue balls in its center and 4 concentric black rings around the center. The first ring from the center has 2 small green balls on it. The second ring has 8 small green balls on it. The third ring has 8 small green balls on it. The outermost ring has 2 small green balls on it. How many electrons are in the third energy level?
Answer:
8 electrons in the third energy level
Explanation:
From the description,the third energy level has 8 electron (represented by the small green balls you describe)
Answer:
8
Explanation:
I gotcha fam
What is the acceleration of a car that goes from zero to 60m/s in 15s?
Answer:What is the acceleration of a car that moves from rest to 15.0 m/s in 10.0 s? Vi=0, vf= 15.0 m/s,t=10.0s, a=? a= vf =vi/tA=15.0m/s-0m/s/10.0s = 15.0s/10.0s m/s*1/s =1.50 m/s^2 11.
Explanation:
A watch manufacturer claims that its watches gain or lose no more than 8 seconds in a year. How accurate are these watches, expressed as a percentage?
Answer:
Accurate at 99.9999746%
Explanation:
First of all, let's calculate how many seconds we have in a year which has 365 days.
1day = 24 × 60 × 60 seconds = 86400 s
Thus, for 365 days, we have;
86400 × 365 = 31536000 seconds
Now, since 1 year has 31536000 seconds, let's find the ratio of efficiency.
We are told that the watch manufacturer claims that its watches gain or lose no more than 8 seconds in a year. Thus, efficiency is given by;
Efficiency = (8/31536000) × 100% = 0.00002536783 %
Thus, it will be be accurate at;
100% - 0.00002536783% ≈ 99.9999746%
An egg falls out of a nest of a tree. It freefalls for 1.5 seconds, and then hits the ground. From how high up did the egg fall?
Answer:
11.025m
Explanation:
Using kinematics,
u = Initial velocity = 0.
t = Time taken = 1.5sec.
a = Acceleration from gravity = 9.8m/s^2
Distance = s
= ut + 1/2 * a * t^2
= 0 + 1/2 * 9.8 * (1.5)^2
= 11.025m
The egg fall from the nest of a tree is 11.025 m.
To find height from where the egg fall, the given values are:
Time taken t = 1.5 seconds.
What is the distance of the egg fall? The egg was falling from the nest of a tree.By knowing the concept of Kinematics,
For a particle moving with a constant acceleration, its displacement after a time period is given by
s = ut +1/2 at²
where, u - initial velocity,
t - Time,
a - acceleration.
As u is the Initial velocity = 0.
t = 1.5s
Acceleration from gravity = 9.8m/s²
Here, Distance = s
Substituting all the values in the formula,
s = ut + 1/2 ( a × t²)
= 0 + 1/2 × 9.8 × (1.5)²
Distance s = 11.025m
So, the distance the egg fall from a nest of a tree is s = 11.025 m.
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If Angela ran to the bus and back to where she started what distance would she travel ?
Answer:
Distance = 30 m
Explanation:
Since the position of the bus is at zero, and distance is a scalar quantity. That is, we are only concerned about the magnitude
If Angela ran to the bus and back to where she started, the distance travelled will be:
Distance = 15 + 15 = 30 m
But her displacement will be:
Displacement = 15 - 15 = 0.
Which structure is represented by the letter D? Choose 1 answer: (Choice A) A Chloroplast (Choice B) B Vacuole (Choice C) C Mitochondria (Choice D) D Nucleus
Answer:
vacuole
Explanation:
Remember vacuoles in plant cells are a lot bigger than there animal cell counterparts.
As Sam comes to a stop on his bike, he slows from 9.00m/s to 0.00m/s in 5.00 seconds. Find the average acceleration of Sam on his bike. Hint: It will be a negative number.
Explanation:
Acceleration is change in velocity over time.
a = (v − v₀) / t
a = (0.00 m/s − 9.00 m/s) / 5.00 s
a = -1.80 m/s²
2. A car is moving south. It is getting faster. In which direction is the acceleration?
North
South
hy
Up
Down
A point charge of +3 C is located at the origin of a coordinate system and a second point charge of -6 C is at x = 1.0 m. At what point on the x-axis is the electrical potential zero?
Answer:
The point at which the electrical potential is zero is x = +0.33 m.
Explanation:
By definition the electrical potential is:
[tex] V_{E} = \frac{K*q}{r} [/tex]
Where:
K: is Coulomb's constant = 9x10⁹ N*m²/C²
q: is the charge
r: is the distance
The point at which the electrical potential is zero can be calculated as follows:
[tex] V_{1} + V_{2} = 0 [/tex]
[tex] K(\frac{q_{1}}{r_{1}} + \frac{q_{2}}{r_{2}}) = 0 [/tex] (1)
q₁ is the first charge = +3 mC
r₁ is the distance from the point to the first charge
q₂ is the first charge = -6 mC
r₂ is the distance from the point to the second charge
By replacing r₁ = 1 - r₂ into equation (1) we have:
[tex]K(\frac{q_{1}}{1 - r_{2}} + \frac{q_{2}}{r_{2}}) = 0[/tex] (2)
By solving equation (2) for r₂:
[tex]r_{2} = \frac{q_{1}}{q_{1} - q_{2}} = \frac{3 mC}{3 mC - (-6 mC)} = +0.33 m[/tex]
Therefore, the point at which the electrical potential is zero is x = +0.33 m.
I hope it helps you!
Since the two charges are placed on the x-axis. Then, the electric potential is zero at the distance of 0.66 m from the second point charge on the x-axis.
What is electric potential?The electric potential at any point is the amount of work needed to move a unit positive charge from infinity to that point.
Given data-
The magnitude of a point charge is, Q = + 3 C.
The magnitude of the second point charge is, Q' = -6 C.
The distance between the two charges is, x = 1.0 m.
The expression for the net electric potential due to both the charges is,
[tex]V = \dfrac{k \times Q}{x} +\dfrac{k \times Q'}{x-y}[/tex]
here,
k is the Coulomb's constant.
y is the distance from the second point charge on the x-axis, where the net potential is zero.
Now, for zero net electric potential due to both the charges we have,
[tex]0 = \dfrac{k \times Q}{x-y} +\dfrac{k \times Q'}{y}\\\\\\-\dfrac{k \times Q'}{y}=\dfrac{k \times Q}{x-y}[/tex]
Solving as,
[tex]-\dfrac{(-6)}{y}=\dfrac{3}{1-y}\\\\6-6y=3y\\\\y =0.66\;\rm m[/tex]
Thus, we can conclude that the electric potential is zero at the distance of 0.66 m from the second point charge on the x-axis.
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what are the 5 native elements?
Answer:
platinum, iridium, osmium, iron, zinc
A force of 25N acts on a body of mass 9 kg. calculate the acceleration produced
Answer:
2.7
Explanation:
[tex]Force = 25N\\mass = 9 kg\\acceleration = ?\\\\Force = mass \times acceleration\\\frac{Force}{mass}= acceleration\\ \\Acceleration = \frac{25}{9} \\\\Acceleration = 2.7[/tex]
what is machine
and type of machine
Answer:
A machine is a mechanical structure that uses power to apply forces and control movement to perform an intended action.
Explanation:
Example: Elevator
A car goes from 30 m/s to 20 m/s in 2 seconds. What is the acceleration of the car in m/s2?
Answer:
[tex] \boxed{\sf Acceleration \ of \ the \ car = -5 \ m/s^2} [/tex]
Given:
Initial speed (u) = 30 m/s
Final speed (v) = 20 m/s
Time taken (t) = 2s
To Find:
Acceleration (a) of the car
Explanation:
From equation of motion we have:
[tex] \boxed{ \bold{v = u + at}}[/tex]
By substituting value of v, u & t in the equation we get:
[tex]\sf \implies 20 = 30 + a(2) \\ \\ \sf \implies 2a + 30 = 20 \\ \\ \sf \implies 2a = 20 - 30 \\ \\ \sf \implies 2a = - 10 \\ \\ \sf \implies a = - \frac{10}{2} \\ \\ \sf \implies a = - 5 \: m {s}^{ - 2} [/tex]
[tex] \therefore[/tex]
Acceleration (a) of the car = -5 m/s²
Using the equation E = mc2, calculate how many joules of energy would be produced by converting 6.8 × 10-6 kg of matter into energy in this fusion reaction. Use c = 3 × 108 m/s.
Answer:
Explanation:
Using the formula : E = mc²
Where m = mass = 6.8 × 10^-6 kg
c = speed of light = 3 ×10^8 m/s
The amount of joules of energy that would be produced equals :
Plugging in our values :
E = mc²
E = (6.8 × 10^-6) kg × (3 ×10^8)²m/s
E = (6.8 × 10^-6) kg × 9 × 10^16 m/s
E = 61.2 × 10^(-6 + 16)
E = 61.2 × 10^10 J
Answer:
E = 6.12 × 1011 kg × m2/s2
Explanation:
What actions are permissible when you are graphically adding one vector to another?
Answer:
1. Which of the following actions is permissible when you are graphically adding one vector to another:
Explanation:
: move the vector, rotate the vector, change the vector's length?
When you graphically add one vector to another, you can only move the vector as long as you don't modify its length or the direction it points in.
What are vector quantities?In physics, a vector is a quantity with both a magnitude and a direction. It is often represented by an arrow whose length is proportional to the magnitude of the quantity and whose direction is the same as that of the quantity.
A vector does not have position, while having magnitude and direction. In other words, a vector's shape is unaltered if it is shifted parallel to itself as long as its length is unaltered.
Hence, when you are graphically adding one vector to another, permissible action is move the vector as long as you don't modify its length or the direction it points in.
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Help me plz science middle school
The correct answer is A. He created a way of naming organisms based on genus and species
Explanation:
Carl Linnaeus created a simple but precise system for naming organisms of any species and kind. This system was known as binomial nomenclature and the names of organisms depend on two main elements: the genus and the species. The first element is a broad category that covers species with a common origin, and the second one is the species, which describes organisms that can reproduce and share many common features including DNA sequence. According to this, the correct answer is A.
which scenario is an example of a scientific way of thinking?
Answer:
A example of a scientific way of thinking is making observations, forming questions, making hypotheses, doing an experiment, analyzing the data, and forming a conclusion.
A straw is placed in a cup of water. The straw has a diameter of 5 mm, the contact angle is 60 degrees and the surface tension of water is 0.073 Nm. Calculate the change in elevation between the water surface in the cup and that in the straw.
Answer:
The change in elevation is 0.0029mmExplanation:
This problem is on the capillary action of water and tube
we are going use the formula below for the rise in liquid level
h= 2Tcos∅/rgρwhere h= height of liquid level in the capillary tube
T= surface tension = 0.073 Nm
∅= angle of contact = 60 degrees
r= radius of bore of capillary tube = 5/2= 2.5 mm to m= 2.5/1000=
2.5*10^-3
g= acceleration due to gravity = 9.81 m/s^2
ρ= density of the liquid (assume water 1000 kg/m³)
we can now substitute to solve for h
[tex]h=\frac{2*0.073cos60}{ 2.5*10^-^3*9.81*10^3} \\\\h=\frac{2*0.073*0.5}{ 2.5*9.81}\\\\h=\frac{0.073}{ 2.5*9.81}\\\\h=\frac{0.073}{ 24.525}\\\\h=\frac{0.073}{ 24.525}\\\\h= 0.0029\\h= 2.9*10^-^3mm[/tex]
A hummingbird beats it’s wings up and down 60 times a second what is the frequency and period
Answer:
Period = 0.0167 seconds
Frequency = 60 Hz
Explanation:
Period: This can be defined as the time take by a wave to complete on cycle. The S.I unit is (s)
Frequency: This is the number of cycle completed by a wave. The S.I unit is (Hz)
From the question,
T = t/n................................... Equation 1
Where T = period, t = time take to complete n oscillation, n = number of oscillation.
Given: t = 1 seconds, n = 60.
Substitute these values into equation 1
T = 1/60
T = 0.0167 seconds.
Also,
F = 1/T........................... Equation 2
Where F = frequency
Given: T = 0.0167 seconds,
Substitute these value into equation 2
F = 1/0.0167
F = 60 Hz
The classification and collection of data that are in the form of numbers is called
Answer:
Statistics
Explanation:
what is relation of acceleration of a body to its mass and applied force
Tor F
Science and technology
are
mutually beneficial.
Answer:
I believe that it's True.
action and reaction are equal in magnitude and opposite in direction then , why do not they balance each other
Explanation:
Newton’s third law of motion states that every action has an equal and opposite reaction. This indicates that forces always act in pairs. Reaction forces are equal and opposite, but they are not balanced forces because they act on different objects so they don’t cancel each other out.
Besides the USA what is another country that does not use the metrio system?
Answer:
The USA, Liberia, and Myanmar (Burma) are the only countries that do not use the metric system
Which scientist created the most modern classification that we use today
Answer:
A. Aristotle
Explanation:
Answer:
A: Aristotle
Explanation:
There is no explanation
Why is a thermos considered a (mostly) closed system?
thermoses come in different shapes and sizes
different types of liquids
stayhot
matter and energy cannot enter or leave the system when the thermos lid is on
tightly
different types of hot or cold items can be stored in a thermos
Answer:
The answer is C. Matter and energy cannot enter or leave the system when the thermos lid is on tightly.
Hope this helps
Thermos considered a closed system as matter and energy cannot enter or leave the system when the thermos lid is on tightly. The correct option is C.
What is a physical system?Any artifact or part of an object that can be evaluated using physics laws is referred to as a physical system.
Physical systems include atoms and bodies of water. The environment is everything outside the system, and it is overlooked in the assessment except for its impacts on the system.
A physical system is a combination of parts or elements that exhibit behavior that the constituents do not. Physical systems are made up of matter and energy.
In physics, chemistry, or engineering, a closed system is a purely natural system that does not permit the transmission of matter into or out of the system, but does allow the transfer of energy.
Thus, C is the correct answer.
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