Answer:
The clip is denser than the three liquids, and water is denser than oil.
Explanation:
In this exercise, the Archimedes principle must be used, on the thrust that is equal to the weight of the dislodged liquid
B = ρ_liquid g V_body
when a body is placed on a liquid, the equilibrium equation must be fulfilled
W - B = 0
W = B
ρ_body g V_body = ρ _liquid g V’
from this expression we see that we have three possibilities
* the density of the body is less than the density of the liquid, therefore the body floats
* The density of the body is equal to the density of the liquid, the body is in equilibrium with the liquid, neither floats nor sinks
* the density of the body greater than that of the liquid, the body sinks.
Based on this, the liquids are arranged in the cylinder according to their density.
ρ_oil < ρ_water < ρ_starch
as the clip sinks
the density of the clip is higher than that of liquids
We review the final statements and the correct one is: Clip is denser than liquids and water is denser than oil
Answer: D
Explanation:
calculate the electric field acting on a proton so that proton remains stationary in a space a)2.04*10^-2 b)1.02*10^-7
Answer:
No electric field will exist.
Explanation:
Given the following:
In other to for the proton to remain stationary in space, the electric field acting on the proton will be 0 or no electric field will exist. From the formulae ;
F = qE ; where q = charge of the particle
E = electric field intensity
The electric field force = F
At a stationary position in space, the electric field intensity = 0
F = qE = q * 0 = 0.
Also according to Heisinberg, measuring the momentum and position of a quantum object becomes more and more uncertain when measured simultaneously.
Here, one of position or momentum is know, measuring the electric field becomes very uncertain.
Greek engineers had the unenviable task of moving large columns from the quarries to the city. One engineer, Chersiphron, tried several different techniques to do this. One method was to cut pivot holes into the ends of the stone and then use oxen to pull the column. The 4-ft diameter column weighs 13200 lbs, and the team of oxen generates a constant pull force of 1500 lbs on the center of the cylinder G. Knowing that the column starts from rest and rolls without slipping, determine the velocity of its center G after it has moved 5 ft and the minimum static coefficient of friction that will keep it from slipping.
The velocity is a vector quantity. The velocity of center G of the column after it has moved 5 ft is 5.18 ft.
From work Energy equation:[tex]U_{12} = T_2[/tex]First, the potential energy of column,
[tex]U_{12} = \int\limits^5_0 {F} \, dx[/tex]
Here, the column moves from zero and displaces 5 ft.
[tex]F[/tex] - force = 1500 lbs
Thus,
[tex]U_{12 } = 7500\rm \ ft\ lbs[/tex]
Now, total kinetic energy at position 2,
[tex]T_ 2 = \dfrac 12 mv_2^{-2} + \dfrac 12 \vec I \omega_2^2[/tex]
Where,
m = 372.67 slugs
r = 2 ft
Since,
[tex]\omega_2 = \dfrac {\vec V}{r}[/tex]
So,
[tex]7500 = \dfrac {12000}{2g}v_2^{-2}+\dfrac {12000}{4g}r^2 \times \dfrac {\vec V}{r}\\\\\vec v_2 = 5.18 \rm \ ft[/tex]
Therefore, the velocity of center G of the column after it has moved 5 ft is 5.18 ft.
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Hi i was wondering if you could help me understand Kelvins? My question on my work says "Which of the following is the SI unit used in measuring the temperature of a hot cup of coffee" and the other question says, "Which of the following would be the SI unit to use in measuring the temperature of a hot liquid?" I said both are Kelvin but i dont really understand and i dont want to be wrong.
Answer:
Hey there!
Kelvin is correct. Farenheit and Celsius are scales derived from the Kelvin scale. For example, K=C+273.15 is the conversion between Kelvin and Celsius.
Let me know if this helps :)
A student walks 6 meters due east and then walks 10 meters due west from the history room to the reading room. The total distance travelled by the student is. m
Answer:
16
Explanation:
10+6=16
A basketball player runs a drill in which he runs the
length of the 30.0 meter court and back. He does
this three times in 50.0 seconds.
30. m
(Not drawn to scale)
1. The magnitude of the player's total displacement
after running the drill is
(1) 0.0 m
(2) 30.0 m
(3) 60.0 m
(4) 180 m
Answer: (1) 0.0 m
Explanation: In physics, displacement is defined as the change in position of a moving object. It is a vector, so has magnitude and direction, determined by a referential create to the system, i.e., the moving object. Mathematically, displacement is calculated by: [tex]\Delta x=x_{f}-x_{0}[/tex], in which:
[tex]x_{f}[/tex] is the final position;[tex]x_{0}[/tex] is the initial postion;[tex]\Delta x[/tex] is the diplacement;For the basketball player, he runs 30m, 3 times, court and back. Assuming the initial position is 0:
[tex]\Delta x=0-0[/tex]
[tex]\Delta x[/tex] = 0.0
Since displacement is given by, only, the initial and final position and the player started at the initial point and ended at the initial point of the court, displacement is 0.
What is the relation between the gravitational force acting between any two bodies object with their masses and the distance between their centres?
Answer:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. ... increases, the force of gravity decreases. If the distance is doubled, the force of gravity is one-fourth as strong as before.
1. An ant travels toward the right along a meter stick. If it starts at the 25.00 cm
mark and then travels to the 80.00 cm mark, what is its distance &
displacement?
Distance 55cm; Displacement 55cm
Answer:
The total distance traveled is 28 inches.
The displacement is 2 inches to the east.
If an ant travels toward the right along a meter stick. If it starts at the 25.00 cm mark and then travels to the 80.00 cm mark, the distance covered by the and would be 55 centimeters and the displacement covered by the ant would be 55 centimeters as well.
What is displacement?Displacement describes this shift in location.
As given in the problem statement If an ant travels toward the right along a meter stick. If it starts at the 25.00 cm mark and then travels to the 80.00 cm mark, then we have to find the distance and the displacement covered by the ant,
For a straight linear motion in a single direction, the distance is equal to the displacement covered by the object.
Thus, the the distance covered by the ant would be 55 centimeters and the displacement covered by the ant would be 55 centimeters as well.
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A student is conducting an experiment to determine how far a ballwill roll down a ramp based on the angle of incline what are the three possible controls for the experiment
Answer:ball, ramp, and angle
Explanation: these are the three things that are controls because you can control them
How is energy related to the change of state represented by the model?
Answer: atoms gain energy as a solid changes to a gas
Explanation:
Answer:
atoms gain energy as a solid changes to a gas
Explanation:
What is the number at the end of an isotope’s name? atomic number neutron number mass number electron number
Answer:
C) mass number
Explanation:
I got it correct on edge
Answer: c
Explanation:
Can scientific ideas and concepts be changed? Why or why not?
Answer:
Yes
Explanation:
Scientific concept is a scientific theory or law that gives proof of how and why a natural event or process occurs.
Yes, scientific ideas and concepts can be changed because the research never stop and when scientists come with a new theory which is more strong than old theory, the old theory is required to be changed.
For example: In the scientific concept of classification of biodiversity, earlier organisms were classified into binomial system including plant and animal kingdoms but now we have five kingdoms that includes monera, protists, fungi, plant and animal kingdoms.
The modern standard of length is 1 m
and the speed of light is approximately
2.99792 x 10° m/s.
Find the time At for light to cover 1 m at
the given speed.
1. Atz 3.3 x 10-73
2. A = 3 x 10-6S
3. At 2 3.3 x 10-ºs
4. At 3.3 x 10-8s
5. At 3.3 x 10-10s
6. At = 3 x 10-83
7. At = 3 x 10-9S
8. AL 3 x 10-10
9. At 3.3 x 10-6S
10. AR 3 x 10-7
Answer:
he correct answer is 7 3 10⁻⁹ s
Explanation:
The speed of light is constant, so we can use the uniform motion ratios
v = x / t
t = x / v
let's calculate
t = 1 / 2.9972 10⁸8
t = 3.336 10⁻⁹ s
the correct answer is 7 3 10⁻⁹ s
The movement of thermal energy from a warmer object to a cooler object is called a. heat. b. temperature. c. motion. d. momentum. Please select the best answer from the choices provided
The energy responsible for temperature is referred as thermal energy. the movement of thermal energy from a warmer object to a cooler object is called heat.
What is heat?Heat is energy that is transferred from one body to another as a result of a temperature difference.
When two bodies at different temperatures come into contact, energy is transferred (i.e., heat flows) from the hotter to the colder.
Thus, the correct option is A.
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I am primarily made of calcium. I protect and act as camouflage. I can be found as a filler in most household spices. What am I?
Answer:
Explanation:
Bones?
Bones are primarily made of calcium. Also, they protect the body, which is pretty much obvious. They also act as camouflage.
The only but I have is, can they be found as a filler in most household?
Asides that, bones pretty much fits in to the answer.
a taller trees has greater chance to fall down than a shorter tree during storm
Answer:
Hi! This is true.
Explanation:
During a storm, high winds are persistent. Taller trees have a longer length than short trees, making the structural integrity lesser. Shorter trees are closer to the ground and have a small chance of falling.
Hope this helped!
Light is emitted by electrons when they drop from one energy level to a lower level. Which transition results in the emission of light with the greatest energy?
Answer:
Level 4 to level 2
Explanation:
Electrons in an atom are contained in specific energy levels (1, 2, 3, and so on) having different distances from the nucleus. When light is emitted by electrons from one energy level to a lower level, level 4 to level 2 has the greatest energy.
Hence, the correct option is "Level 4 to level 2".
A company wants to build a new type of spaceship for transporting astronauts to the moon. What should the company do first?A. Test the prototype.B. Evaluate the design.C. Build a model.D. Identify needs.
Answer: Identify needs
As a company wants to build a new type of spaceship for transporting astronauts to the moon. The company should identify the needs first. The correct option is D.
What is spaceship?A spacecraft is a vehicle or machine that is designed to travel through space.
Spacecraft, a type of artificial satellite, are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and human and cargo transportation.
In addition to science instruments, a spacecraft has a number of critical components such as an engine, power subsystem, steering system, and communications system.
The majority of these systems are housed in the service module, while the science instruments are housed in the payload module.
A company wishes to construct a new type of spaceship capable of transporting astronauts to the moon. The company should start by identifying the needs.
Thus, the correct option is D.
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Several motorboats with the same mass are used in an experiment. The forces of the different motors versus their accelerations are graphed. What is the y-intercept of this graph? (1point) Does anyone know the answer?
Answer:
C. the velocity
Explanation:
Answer:
1.) As rocket mass increases, acceleration decreases
2.) The inverse of the mass of the boat
3.) Zero
4.) When the velocity increases
5.) It increases
Explanation:
took the test, all were correct
A current of 0.300 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heart beat and disrupting the flow of blood (and thus oxygen) to your brain. If that current persists for 3.06 min, how many conduction electrons pass through your heart?
Explanation:
Given that,
Current passes through our chest is 0.3 A
The current persists for 3.06 minutes
We need to find the number of conduction electrons pass through your heart. Charge flowing divided by time equals current. Also, q = ne
[tex]I=\dfrac{ne}{t}\\\\n=\dfrac{It}{e}\\\\n=\dfrac{0.3\times 3.06\times 60}{1.6\times 10^{-19}}\\\\n=3.44\times 10^{20}[/tex]
So, [tex]3.44\times 10^{20}[/tex] electrons would pass through your heart.
If the maximum acceleration that is tolerable for passengers in a subway train is 1.21 m/s2 and subway stations are located 810 m apart, what is the maximum speed a subway train can attain between stations
Answer:
v = 44.27 m / s
Explanation:
This is an exercise in kinematics since they ask the maximum speed of the train
v² = v₀² + 2 a x
a train departs with zero initial velocity
v² = 2 a x
v = √ 2ax
calculate
v = √ (2 1.21 810)
v = 44.27 m / s
in this solution we have assumed that the train uses the entire distance with acceleration
The modern standard of length is 1 m and the speed of light is approximately 2.99792 x 10^8 m/s. Find the time change in t for light to cover 1 m at the given speed.
Explanation:
Distance = rate × time
1 m = (2.99792×10⁸ m/s) t
t = 3.33565×10⁻⁹ s
Light is the fastest thing in the universe. The speed of light is 2.99792 x 10⁸ m/s . The time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
What is speed?Speed is a physical quantity that means the distance in meter covered by a moving body in one second. The speed of light is 2.99792 x 10⁸ m/s. Light from sun only takes 8 min to travel to the earth surface.
The speed of a moving particle or wave is mathematically the ratio of distance and time. Thus time of travel can be found out from the distance and speed.
It is given that the distance travelled by light is 1 m and its speed is 2.99792 x 10⁸ m/s. Thus the time taken to travel is calculated as follows:
Time = distance/speed
= 1 m/ (2.99792 x 10⁸ m/s)
= 3.39 x 10⁻⁹s
Therefore, the time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
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The AC voltage source is connected to an inductor and a resistor in series. If the frequency of the source is increased the current in the circuit will _________.
Answer:
If the frequency of the source is increased the current in the circuit will decrease.
Explanation:
The current through the circuit is given as;
[tex]I = \frac{V}{Z}[/tex]
Where;
V is the voltage in the AC circuit
Z is the impedance
[tex]Z = \sqrt{R^2 + X_L^2}[/tex]
Where;
R is the resistance
[tex]X_L[/tex] is the inductive reactance
[tex]X_L[/tex] = ωL = 2πfL
where;
L is the inductance
f is the frequency of the source
Finally, the current in the circuit is given as;
[tex]I = \frac{V}{\sqrt{R^2 + (2\pi fL)^2} }[/tex]
From the equation above, an increase in frequency (f) will cause a decrease in current (I).
Therefore, If the frequency of the source is increased the current in the circuit will decrease.
A crowbar having the length of 1.75 m is used to balance a load of 500 N If the distance between the fulcrum and the load is 0.5 calculate MA and VR and efficiency
load distance*l=effort distance*e
o.5*500=x*1.25
250/1.25=x
200=x
ma=load/effort
500/200
2.5
vr=ed/ld
1.25/0.5
2.5
effciency=ma/vr*100
100%
astronauts feel weightlessness, why?
Answer:
They are weightless because there is no external contact force pushing or pulling upon their body.
Explanation:
Answer:
nope because the ground created a normal force
Explanation:
A ______ is a single encased electrochemical unit, with one positive and one negative electrode, with a voltage differential across its two terminals
Answer:
Cathode: The positive electrode of a cell. Cell: A single encased electrochemical unit (one positive and one negative electrode) which exhibits a voltage differential across its two terminals.
Answer:
Cell
Explanation:
A cell is a single encased electrochemical unit (one positive and one negative electrode) which exhibits a voltage differential across its two terminals.
12. You are building a go-cart. You want to know how you can make it go as fast as it can.
Explain how you can use both chemistry and physics to help you build your go-cart (5 points). I
Answer:
Physical measures: Reduction of internal friction, high static friction tire system
chemist. : air-fuel ratio as efficient
Explanation:
A go-Kart is a vehicle that can be with a motor or with pedals, which is in contact with the ground.
Physical measures that help increase vehicle speed are:
* Reduction of internal friction, use bearings, with greased joints to reduce friction
* Decreased friction when forward creating an aerodynamic raindrop shape, sharp at the front and with a rapid descent at the rear, but without abrupt cuts to the geometry
* Path difference for air passing through the top and bottom, to create a downward force help lower the car by increasing speed
* A high static friction tire system so you can move faster on surfaces and take turns faster
* A shifting system to have an effective torque either pedal or motor, gear shifting system
From the point of chemist.
* Obtain an air-fuel ratio as efficient as possible to increase the force per unit of fuel.
Cell theory, the theory of evolution, the theory of relativity, and the big bang theory are all examples of scientific theories. The law of inertia, the law of universal gravitation, the laws of thermodynamics, and the law of independent assortment are all examples of scientific laws. What is the primary difference between scientific theories and scientific laws? A. Scientific theories are often discarded and replaced by completely different theories. B. Scientific laws have been proven without exception under certain stated conditions. C. Scientific laws can change over time as new technology is developed and new data is collected. D. Scientific theories are educated guesses still need to be verified through experimentation.
Answer:
B
Explanation:
Answer:
B. scientific laws have been proven without exception under certain stated conditions.
Explanation:
A 4 kg kitten is sliding at 12 m/s on a horizontal frictionless surface. A constant force is applied that slows it with an acceleration of 3 m/s/s. How much work must this force do to stop the kitten
Answer:
288 Joules
Explanation:
Work= delta kinetic energy. To find the work required to stop the kitten, you have to find the delta kinetic energy between when the kitten is moving and when it is stopped. Since it is not moving when it's stopped, it has no kinetic energy. So to find the work, just find the kinetic energy of the kitten moving at 12m/s.
KE=1/2((m)(v^2)), therefore
delta KE=(1/2)*((4kg)*((12m/s)^2))-0
The work done must this force do to stop the kitten will be "288 Joules". To understand the calculation, check below.
Work done and AccelerationAccording to the question,
Mass of kitten, m = 4 kg
Speed, v = 12 m/s
Acceleration, a = 3 m/s²
We know the formula,
→ Kinetic energy, K.E = [tex]\frac{1}{2}[/tex] mv²
then,
→ ΔK.E = [tex]\frac{1}{2}[/tex] mv² - 0
By substituting the values, we get
= [tex]\frac{1}{2}[/tex] × 4 × (12)² - 0
= [tex]\frac{1}{2}[/tex] × 4 × 144 - 0
= 2 × 144
= 288 Joules
Thus the above response is correct.
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You are in an elevator that is accelerating you upward at 4.55 m/s^2. How much time does it take you to reach a speed of 11.0 m/s?
Answer:
t = 2.01 seconds
Explanation:
It is given that,
The acceleration of the elevator is 4.55 m/s².
We need to find time taken by you to reach a speed of 11 m/s
The initial velocity of the person is equal to 0 (at rest). Let t is the time.
Using equation of kinematics as follows :
v = u +at
Acceleration = g-a and u = 0
So,
[tex]t=\dfrac{v}{g-a}\\\\t=\dfrac{11}{10-4.55}\\\\t=2.01\ s[/tex]
So, 2.01 seconds is taken to reach a speed of 11 m/s.
When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region.
Required:
What is the frequency of this radiation?
Answer:
14.3 x 10^8Hz
Explanation:
Using
Frequency= speed of light /wavelength
Then substituting
3*10^8m/s / 0.21m
= 14.3 x10^8 Hz