Answer:
x_total = 20m
Explanation:
This is an exercise in kinematics, we will look for the distance it travels during the reaction time, where there is no braking, and then the distance during the deceleration.
Distance traveled during response time
v = x₁ / t
x₁ = v t
let's calculate
x₁ = 10 0.75
x₁ = 7.5 m
Now we calculate the distance during braking, the final speed is zero (v = 0)
v² = v₀² - 2 a x₂
x₂ = v₀² / 2 a
let's calculate
x₂ = 10² / (2 4)
x₂ = 12.5m
the total stopping distance is
x_total = x₁ + x₂
X_total = 7.5 + 12.5
x_total = 20m
This demonstrates which of the following?
Answer:
A. is the answer
A kettle transfers 1500 J of energy, 1200 J to a thermal energy store and 300 J to a vibrational energy store (sound). How efficient is the kettle?
Answer: 0.8
Explanation:
The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.
So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.
So the efficiency is n = 1200j/1500j = 0.8
This means that a 80% of the energy imput is actually used to heat the kettle.
A homogenous rod of length 5 m and a mass of 60 kg is kept in lever. Calculate the effort required to balance lever.
Answer:
Junior Member. A 60 lb weight is located 3 feet from the fulcrum of a lever.
Explanation:
Q2: The RMS potential difference of an AC household outlet is 117 v.
a) What is the maximum potential difference across a lamp connected to the outlet?
b) If the RMS current through the lamp is 5.5 A, what is the lamp's maximum current?
Answer:
(a) 165.46 V
(b) 7.78 A
Explanation:
(a) From the question,
Vrms = V₀/√2...................... Equation 1
Where V₀ = maximum potential difference across a lamp connected to the outlet.
make V₀ the subject of the equation.
V₀ = √2(Vrms)............... Equation 2
Given: Vrms = 117 V.
Substitute into equation 2
V₀ = (√2)(117)
V₀ = 165.46 V.
(b) Similarly,
I₀ = √2(Irms)....................... Equation 3
Given: Irms = 5.5 A
Substitute into equation 3
I₀ = (√2)(5.5)
I₀ = 7.78 A.
A nightlight uses 4.0W of power when plugged into an outlet. The current of the circuit is .034A. What is the voltage across the light bulb's filament?
Answer:
Voltage V = 117.65 volts
the voltage across the light bulb's filament is 117.65 V
Explanation:
The power of a light bulb can be expressed with respect to voltage and current flow.
Power = voltage × current
P = VI
Making Voltage V the subject of formula;
V = P/I
Given;
Power P = 4.0W
Current I = 0.034A
Substituting the given values;
V = 4/0.034
V = 117.65 volts
A motorcycle starting from rest covers 200 metre distance in 6 second. Calculate final velocity and acceleration of the motorcycle.
Answer:
Explanation:I don't say you must have to mark my ans as brainliest but if you think it has really helped u plz don't forget to thank me....
Why is creativity important in constructing scientific questions?
A. Science only works when everyone does exactly the same thing.
B. Creativity is the only way to make a controlled experiment.
C. There are very few scientists who are creative people.
D. Asking an unusual question can lead to major breakthroughs.
Science does not work when every one does the same thing, some creative thinking will be major breakthroughs for an invention. Therefore, option B is correct.
Why creativity plays a role in scientific experiments ?So how do researchers come up with those particular questions to look into ! It may come as a shock to learn how much imagination is required for the procedure.
Peter Medawar, a Nobel Prize-winning biologist, once described scientific inquiry as "the art of the soluble" In order to succeed in science, one must first identify the questions that may be answered by scientific study and then determine the answers to those questions, according to Medawar.
Because of how intricate the natural world is, it is frequently impossible to directly address the really intriguing, significant scientific topics
The art of science includes repeatedly re-imagining these complex issues, mentally dividing them into more manageable components, and then guessing as to which of these more manageable components might hold the answer to solving the larger issue.
Therefore, all the discoveries and inventions are resulted from the creative ideas and thoughts of scientists. Therefore, creativity is the only way to make a controlled experiment.
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explain the application of pascals law
Answer:
pplications of Pascal’s Law
Hydraulic Lift: The image you saw at the beginning of this article is a simple line diagram of a hydraulic lift. This is...
The construction is such that a narrow cylinder (in this case A) is connected to a wider cylinder (in this case B). They...
Pressure applied at piston A is transmitted equally to piston B without diminishing, on use of an incompressible fluid.
Explanation:
A police car chases a speeder along a straight road towards a cliff both vehicles move at 160km/h the siren on the police car produces sound at a frequency of 100hz calculate Doppler shift in the frequency heard by the driver in a car behind the police at 120km/h moving towards the cliff and velocity if sound in air is 330m/s
Answer:
f ’= 97.0 Hz
Explanation:
This is an exercise of the doppler effect use the frequency change due to the relative movement of the fort and the observer
in this case the source is the police cases that go to vs = 160 km / h
and the observer is vo = 120 km / h
the relationship of the doppler effect is
f ’= f₀ (v + v₀ / v- [tex]v_{s}[/tex])
let's reduce the magnitude to the SI system
v_{s} = 160 km / h (1000 m / 1km) (1h / 3600s) = 44.44 m / s
v₀ = 120 km / h (1000m / 1km) (1h / 3600s) = 33.33 m / s
we substitute in the equation of the Doppler effect
f ‘= 100 (330+ 33.33 / 330-44.44)
f ’= 97.0 Hz
help please! This question is driving me crazy
Answer:
-10.8°, or 10.8° below the +x axis
Explanation:
The x component of the resultant vector is:
x = 3.14 cos(30.0°) + 2.71 cos(-60.0°)
x = 4.07
The y component of the resultant vector is:
y = 3.14 sin(30.0°) + 2.71 sin(-60.0°)
y = -0.777
Therefore, the angle between the resultant vector and the +x axis is:
θ = atan(y / x)
θ = atan(-0.777 / 4.07)
θ = -10.8°
The angle is -10.8°, or 10.8° below the +x axis.
The distance between Neptune and the Sun is 30.06 AU. What is this distance in millions of kilometers? (One AU is about 150 million kilometers.)
A. 450 million kilometers
B. 450.9 million kilometers
C. 4,000 million kilometers
D. 4,509 million kilometers
Answer:
It will be B
Explanation:
Answer:The answer is B
5 different energy stores
i got
chemical, kinetic, internal, nuclear
what am i missing?
Answer: There are seven main stores of energy: magnetic
internal (thermal)
chemical
kinetic
electrostatic
elastic potential
gravitational potential
Explanation: So you can have any of these
A thermometer measures the temperature of air and uses units like?
Answer:
A thermometer is an instrument that measures temperature.
Explanation:
It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air.
some amusement parks have a ride where people are attached to a long cable, pulled back, and let go, like a pendulum. if the cable is 45.5 m long, what will the period of oscillation be?(unit=s)
Answer:
The period is [tex]T = 13.53 \ sec[/tex]
Explanation:
From the question we are told that
The length of the cable is [tex]L = 45.5 \ m[/tex]
Let take acceleration due to gravity as [tex]g = 9.8 \ m/s^2[/tex]
Now the period of the oscillation is mathematically represented as
[tex]T = 2 \pi \sqrt{\frac{L}{g} }[/tex]
substituting values
[tex]T = 2 * 3.142 \sqrt{\frac{45.5}{9.8} }[/tex]
[tex]T = 13.53 \ sec[/tex]
Answer: 13.53
Explanation:
An 85kg man is jogging with a velocity of 2.6m/s to the north .nearby a 65kg person is skateboarding and traveling with a velocity of 3m/s north .which person has greater momentum show your calculations
Answer:
P1 = 85×2.6=221kgm/s
P2= 65×3=195kgm/s
so first person had more momentum
how much space does 1pound of butter occupy if the density of butter is 0.94 grams/cm cubed
Answer:
483.6 centimeters³
Explanation:
Taking into account the definition of density, 1 pound of butter occupies 482.54 cm³.
First of all, you have to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know:
density= 0.94 [tex]\frac{grams}{cm^{3} }[/tex]mass= 1 pound= 453.592 gramsvolume= ?Replacing in the definition of density:
[tex]0.94\frac{grams}{cm^{3} } =\frac{453.592 grams}{volume}[/tex]
Solving:
volume× 0.94 [tex]\frac{grams}{cm^{3} }[/tex]= 453.592 grams
[tex]volume =\frac{453.592 grams}{0.94\frac{grams}{cm^{3} }}[/tex]
volume= 482.54 cm³
Finally, 1 pound of butter occupies 482.54 cm³.
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SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous for his square shape, but SpongeSusie is homozygous for her round shape. Create a Punnett square to show the possibilities that would result if SpongeBob and SpongeSusie had children. HINT: square shape is dominant. A. List the possible genotypes and phenotypes for their children. B. What are the chances of a child with a square shape? out of or % C. What are the chances of a child with a round shape? out of or ____%
Answer:
A. Pp - square pant
pp - round pant
B. 1 out of 2 or 50%
C. 1 out of 2 or 50%
Explanation:
Assuming that square pant shape is represented by the allele P, the alternate version (round pant) will be p.
Spongebob's genotype will be Pp since he is heterozygous for his square pant shape.
SpongeSusie's genotype will be pp since she is homozygous for her round pant shape.
Pp x pp
Progeny: 2Pp, 2pp (See the attached image for the Punnet's square)
Possible genotypes and phenotypes of the children:
Pp - Square pant
pp - round pant
Chances of a child with a square shape = 1/2 or 50%
Chances of a child with a round shape = 1/2 or 50%
Answer:
50
Explanation:
Look around the room you are in. Name
something in the space that would be a
conductor. How about an insulator?
Answer:
A wire,rubber
Explanation:
yes
Answer:
Water is a conductor,
An Eraser is an insulator.
Explanation:
Water contains charged ions and impurities that make it a very good conductor of electricity.
The properties of rubber (eraser) causes the electrons to slow down and eventually prevent them from moving at all. Keeping electricity bound within the material is the main goal of an insulator.
expansion is greatest in A solid B gases C liquid D all
Answer: b)Gases
Explanation: Because the Particle are moving freely
list all the types of energy
Answer:
See Below
Explanation:
1: Thermal Energy
2: Chemical Energy
3: Nuclear Energy
4: Electrical Energy
5: Radiant Energy
6: Light Energy
7: Motion Energy
8: Sound Energy
There are 8 types are energy that are above.
Hope this helps.
During photosynthesis, ___________ energy is converted into ____________ energy.
Answer:
Answer is radiant and chemical.
Hope this help:)
Sry if wrong
What are five differences between drama and prose
Answer:
Drama: it has sadness anger and romance
and
i forgot about Prose =w=
Explanation:
A block of metal has a mass of 0.5Kg and density of 8000kg/m3. if it is suspended from a string and completely immerged in water(gw=1000kg/m3). the tension in the string(the answer is 4.375N what are the steps)
Explanation:
Draw a free body diagram. There are three forces on the block:
Weight force mg pulling down,
Buoyancy force B pushing up,
Tension force T pushing up.
Sum of the forces in the y direction:
∑F = ma
B + T − mg = 0
T = mg − B
Buoyancy is the weight of the displaced fluid:
T = mg − ρVg
The block is fully submerged, so the volume of displaced fluid equals the volume of the block. The volume of the block is its mass divided by its density.
T = mg − ρ (m/ρₓ) g
T = mg (1 − ρ/ρₓ)
Plug in values and solve.
T = (0.5 kg) (10 m/s²) (1 − (1000 kg/m³) / (8000 kg/m³))
T = (5 N) (1 − ⅛)
T = 4.375 N
What is an example of a wave that is not mechanical and how is it different?
Answer:
light is an example of a wave that is not mechanical .
it is different as it does not need material medium for its propagation
Which airplane has more potential energy, a boeing 787 dreamliner having a mass of 2,450kg at 11,500 m above Earth, or a boeing 747 having a mass of 3150 kg at 9000 m above Earth?
Explanation:
For 787 dreamliner airplane,
Mass, [tex]m_1=2450\ kg[/tex]
Height, [tex]h_1=11500\ m[/tex]
Potential energy of 787 dreamliner airplane is given by :
[tex]E_1=m_1gh_1\\\\E_1=2450\times 9.8\times 11500\\\\E_1=2.76\times 10^8\ J[/tex]
For a boeing 747,
Mass, [tex]m_2=3150\ kg[/tex]
Height, [tex]h_2=9000 \ m[/tex]
:
Potential energy of a boeing 747 airplane is given by
[tex]E_2=m_2gh_2\\\\E_2=3150\times 9.8\times 9000\\\\E_2=2.77\times 10^8\ J[/tex]
So, the potential energy of a boeing 747 airplane is more than the 787 dreamliner airplane.
Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. Which part of the scientific method is this? Group of answer choices conclusion experiment observation none of these hypothesis
Answer:
a
Explanation:
i took the test
Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. This is observation of the scientific method.
What is scientific method?Since at least the 17th century, the scientific method—an empirical approach to learning—has guided the advancement of science. Since one's interpretation of the observation may be distorted by cognitive presumptions, it requires careful observation and the application of severe skepticism regarding what is observed.
It entails developing hypotheses through induction based on these observations, testing the validity of those hypotheses through experimental and measurement-based statistical testing of the inferences made from them, and then fine-tuning (or discarding) those hypotheses in light of the experimental results.
These are the guiding principles of the scientific process, as opposed to a predetermined set of steps that apply to all scientific endeavors.
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A solute depresses the freezing point because the solute ____.
a. is colder than the solvent
b. disrupts crystal formation of the solvent
c. tends to sink to the bottom of the solution
d. has bigger molecules than the solvent
Answer:
The correct option is b: A solute depresses the freezing point because the solute disrupts the crystal formation of the solvent.
Explanation:
The depression of the solvent's freezing point is caused by the addition of a solute because the presence of the molecules of the solute interferes in the arrange and close up of the molecules of the solvent to form the crystal of the solid.
The attraction of the solute molecules to the solvent molecules interfere with the formation of the solid, so the solution must be cooled to a lower temperature so it can form the solid.
Hence, the correct option is b: A solute depresses the freezing point because the solute disrupts the crystal formation of the solvent. The other options are incorrect.
I hope it helps you!
6) what is ararge of speed
Answer:
in everyday use and in kinematic the speed of an object is the magnitude of the change of its position it is thus a scalar quantity
Two waves with Amplitude of 75 units and 74 units arrive at a point in a medium simultaneously. If the two waves are out of phase with each other what is the resultant amplitude of the wave
Answer:
Resultant amplitude = 1 unit.
Explanation:
The amplitude of a wave is its maximum displacement during propagation.
Since the two waves are out of phase, the resultant amplitude can be determine by;
Resultant amplitude, [tex]A_{R}[/tex] = [tex]\sqrt{A_{1} ^{2} + A_{2} ^{2} + 2A_{1} A_{2}cos \alpha }[/tex]
= [tex]\sqrt{(A_{1} - A_{2} )^{2} }[/tex]
= [tex]A_{1}[/tex] - [tex]A_{2}[/tex]
where [tex]\alpha[/tex] is the phase difference.
Given that: [tex]A_{1}[/tex] = 75 units, [tex]A_{2}[/tex] = 74 units, so that;
[tex]A_{R}[/tex] = 75 - 74
= 1
The resultant amplitude of the two wave when out of phase is 1 unit.
Answer:
Resultant amplitude = 1 unit.
Explanation:
The amplitude of a wave is its maximum displacement during propagation.
Since the two waves are out of phase, the resultant amplitude can be determine by;
Resultant amplitude, =
=
= -
where is the phase difference.
Given that: = 75 units, = 74 units, so that;
= 75 - 74
= 1
The resultant amplitude of the two wave when out of phase is 1 unit.
Rock composed of many thin layers. This image appears in an Earth science magazine with this caption: "A non-foliated rock found in the Himalayan Mountains.” Is the caption for this image correct? Why or why not? Yes, because the grains are arranged in thin, parallel layers. No, because the grains are arranged in thin, parallel layers. Yes, because the grains are arranged randomly. No, because the grains are arranged randomly.
Answer:
its B
Explanation:
Answer:
It's B, No, because the grains are arranged in thin, parallel layers.
Explanation:
I literally took the test 5 seconds ago and it was right.