Answer:
kinetic friction is expressed as
Fk≈ μkFn
Where
the coefficient of kinetic friction is μk
the normal force is Fn
Explanation:
Which answer best describes the scientific method?
A. An experiment that has no independent variables
o
B. Ten steps that are followed in a certain order
C. The basic categories for five processes that scientists use
D. The exact order of steps used in every experiment
SUBMIT
Answer:
D. The exact order of steps used in every experiment
Explanation:
since the scientific meathod is a process of exact steps used to create an experiment this would be the closest answer
Answer:
C. The basic categories for five processes that scientists use
An object moving north with an initial velocity of 14 m/s accelerates 5 m/s2 for 20 seconds. What is the final velocity of the object? 39 m/s 90 m/s 114 m/s 414 m/s
Answer:
Final velocity of the object(v) = 114 m/s
Explanation:
Given:
Initial velocity (u) = 14 m/s
Accelerates (a) = 5 m/s²
Time taken = 20 seconds
Find:
Final velocity of the object(v) = ?
Computation:
According to 1st law of motion.
⇒ v = u +at
⇒ v = 14 + (5)(20)
⇒ v = 14 + 100
⇒ v = 114 m/s
Final velocity of the object(v) = 114 m/s
Which of the following is an example of a primary source?
A. A dictionary definition of a science term
B. An article written by a scientist
C. A textbook written by a scientist
D. An encyclopedia entry about an experiment
Answer:
i think its no c.
a textbook written by a scientist. because its a first hand data.
An article written by a scientist is an example of a primary source. The correct option is option (B).
A primary source refers to an original, firsthand account or direct evidence of an event, topic, or research. It is created by individuals who directly participated in or witnessed the subject matter. An article written by a scientist would be considered a primary source as it typically presents the researcher's own observations, experiments, methodology, and conclusions.
It provides direct access to the original research and findings, making it an important source for scholarly and scientific purposes. In contrast, options A, C, and D are secondary sources that provide interpretations or summaries of information from primary sources.
Therefore, The correct option is an option (B).
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Which line shows both positive velocity and positive acceleration?
I THINK LINE [ D ] IS THE RIGHT ANSWER....
Explanation:
BECAUSE IN [ D ] THERE SHOWS MANY ANGLE AND THERE LIES BOTH POSITIVE VELOCITY AND POSITIVE ACCELERATION.......
HOPE IT HELP.......❣❣❣
Answer:
Line C
Explanation:
Start at point O and accelerates upwards in a positive slope.
What Variables Affect Friction? Select all that apply.
Frank gives a box of books a push to the right, which makes it slide across his
bedroom floor. Friction slows the box down as it slides. Which free-body
diagram shows the box as it is sliding to the right, after Frank has stopped
pushing it?
Answer:
C
Explanation:
Answer:
yea its c
Explanation:
Please help me in this question!! There is NO picture fo this question! In a physics lab, 0.30 kg puck A, moving at 5.0 m/s [W], undergoes a collision with 0.40 kg puck B, which is initially at rest. Puck A moves off at 4.2 m/s [W 30° N]. Find the final velocity of puck B.
15. The above figure shows the path of a ray of light falling on the mirror(s) represented by a box. Which of the following arrangements of mirrors will produce light rays in the path shown above?
Answer: A
Explanation:
From the figure given as attachments, the error pointing upward signifies the incident ray while the one point downwards signifies the reflected ray.
One of the laws of reflection is stated that the angle of incidence is equal to the angle of reflection.
Since the two arrows are parallel to each other, then the mirror must be perpendicular to the two arrows. That is, the incident ray and the reflected ray must be perpendicular to the mirror.
Option A is the correct answer.
Answer: answer is NOT A, ITS B!
Explanation:
ik
The _________of friction is a number that represents the resistance to sliding between two surfaces in contact with one another.
Answer:
coefficient
Explanation:
vocabulary
Answer:
Hey!
Your answer is definitely coefficient!
Explanation:
Hope this helps!
Can please tell what mistake I did??question number 10
Explanation:
When we draw the diagram of the motion we get a right angled triangle.
We have an angle of 30° and a base of 17.3M.
We will use trigonometric ratios to solve this.
We will use tan.
Tan = Opposite / adjacent
Tan 30° = h / 17.3
h = Tan 30 × 17.3
h = 0.5774 × 17.3 = 9.99 M
or 9.99 can be roundoffed with 10m
What causes the particles within the nucleus of an atom to bond together? Question 12 options: electromagnetism gravity weak nuclear force strong nuclear force
Answer:
Strong nuclear force
Explanation:
The particles in the atom's nucleus bond together because there is a strong nuclear force between the protons and neutrons that attracts them to each other and binds together the nucleus.
48:09 Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? The first law describes how thermal energy is conserved but not the direction it moves. The first law describes the direction thermal energy moves but not how it is conserved. The first law describes how thermal energy can be created but not how it can be destroyed. The first law describes how thermal energy can be destroyed but not how it can be created.
Answer:
A). The first law describes how thermal energy is conserved but not the direction it moves.
Explanation:
Thermodynamics is demonstrated as the branch of physics that deals with the associations or relationships between heat and other energy forms like mechanical, chemical, and electrical).
As per the question, the first law discusses that heat is a kind or form of energy and thus, processes associated with thermodynamics are subject to energy conservation principle. Therefore, heat energy can neither be destroyed nor created but rather transferred to one place to another and converted to and from other energy forms.
Thus, the first law of thermodynamics is distinct from the second law as 'the former describes how thermal energy can be conserved to and from other forms of energy and not the direction in which it moves' while the second law focuses on entropy. Therefore, option A is the correct answer.
The first law of thermodynamics describes the conservation of heat energy but not the direction it moves. Option A correct.
First law of Thermodynamics:
It states that the energy cannot be produced or destroyed it just change from one form to another.
Heat is a form of energy and thus, follow the energy conservation principle. So, heat can be change into mechanical energy.
The second law describe the direction of movement of heat.
Therefore, option A is the correct answer.
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What is the force of gravity (from the Earth) on the 700kg satellite if it’s 10km above the Earth's surface?
Answer:
g = 4.7 × [tex]10^{-16}[/tex] m/[tex]s^{2}[/tex]
Explanation:
Given that the mass of the satellite = 700 kg, and 10,000 m above the earth;s surface.
From Newton's second law,
F = mg ............... 1
From Newton's gravitation law,
F = [tex]\frac{GMm}{r^{2} }[/tex] .................. 2
Where: F is the force, G is the gravitational constant, M is the mass of the first body, m is the mass of the second body, g is the gravitational force and r is the distance between the centers of the two bodies.
Equate 1 and 2 to have,
mg = [tex]\frac{GMm}{r^{2} }[/tex]
⇒ g = [tex]\frac{GM}{r^{2} }[/tex]
But; G = 6.67 × [tex]10^{-11}[/tex] N [tex]m^{2} Kg^{-2}[/tex], M = 700 Kg, r = 10000 m
Thus,
g = [tex]\frac{6.67*10^{-11*700} }{10000^{2} }[/tex]
= [tex]\frac{4.669*10^{-8} }{1*10^{8} }[/tex]
= 4.669 × [tex]10^{-16}[/tex] m/[tex]s^{2}[/tex]
The force of gravity on the satellite is 4.7 × [tex]10^{-16}[/tex] m/[tex]s^{2}[/tex].
A pendulum clock is taken to the moon (g = 1.6 N/kg). How long must the pendulum be in order for the clock to
continue keeping accurate time (1 second cycle)?
3.2 m
7.9 m
0 0.25 m
0.041 m
Answer:
0.041 m
Explanation:
T = 2π√(L/g)
1 s = 2π√(L / (1.6 N/kg))
L = 0.041 m
Answer:
0.041
Explanation:
got right on test!
What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.30 m? please no bad answers
Answer:
39 m/s
Explanation:
speed = frequency x wavelength (All SI Unit)
speed = 100 Hz x 0.30 m = 30 m/s
A 51-kg woman runs up a vertical flight of stairs in 5.0 s. Her net upward displacement is 5.0 m. Approximately, what average power did the woman exert while she was running?
Answer:
The average power the woman exerts is 0.5 kW
Explanation:
We note that power, P = The rate at which work is done = Work/Time
Work = Energy
The total work done is the potential energy gained which is the energy due to vertical displacement
Given that the vertical displacement = 5.0 m, we have
Total work done = Potential energy gained = Mass, m × Acceleration due to gravity, g × Vertical height, h
m = 51 kg
g = Constant = 9.81 m/s²
h = 5.0 m
Also, time, t = 5.0 s
Total work done = 51 kg × 9.81 m/s²× 5 m = 2501.55 kg·m²/s² = 2501.55 J
P = 2501.55 J/(5 s) = 500.31 J/s = 500.31 W ≈ 500 W = 0.5 kW.
A man travels 15 km east before turning around and heading 5 km west. What is his displacement?
A) 20 km
B) 10 km west
C) 10 km East
D) 20 km East
Answer:
10 km East
Displacement is the shortest path between two points.
Oddyssey was named after the film 2001 A space Odyssey. Suggest a reason for this
Answer:
was inspired by Clarke's 1951 short story "The Sentinel" and other short stories by Clarke. :)
Ethan made a diagram to compare examples of the first and second laws of thermodynamics. What belongs in the areas marked X and Y?
X: The internal energy of a piston system increases
as heat is added and rises to a cool area
Y: As thermal energy is added to a container, some
of the energy is lost to the environment
X: As thermal energy is added to a container, some
of the energy is lost to the environment
Y: The internal energy of a piston system increases
as heat is added and rises to a cool area
X: A cold spoon placed in hot liquid gets warmer
Y: Thermal energy is converted to light energy
X: Thermal energy is converted to light energy
Y: A cold spoon placed in hot liquid gets warmer
Answer:
D: X: Thermal energy is converted to light energy
Y: A cold spoon placed in hot liquid gets warmer
Explanation:
j took the quiz
The first and second laws of thermodynamics are used to describe the process of heat transfer.
What are the laws of thermodynamics?The laws of thermodynamics are laws that show the transfer of heat energy there are three laws of thermodynamics that guide heat transfer.
From the statements of the first and second laws of thermodynamics, the statements that fit into the circles are;
X: Thermal energy is converted to light energy
Y: A cold spoon placed in hot liquid gets warmer
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Which option describes a phase change
Answer:
b. Gasloine evaporating into the air
I tryed to answer
The line graph below shows the number of downloads of two songs after
they are released. The downloads are shown in units of hundreds.
70
Number of downloads
(hundreds)
30
10
10 11 12 13 14 15
Time minutes)
a
About how many downloads did song 2 have at minute 8?
Which of the following statements about atomic masses is true? Question 14 options: Atomic masses include masses of neutral atoms. Atomic masses include masses of bare nuclei. Atomic masses do not include masses of electrons. Atomic masses do not include masses of neutrons.
Answer:
Atomic masses do not include masses of neutrons
Atomic masses do not include masses of electrons is the statement that is true about atomic mass.
What is atomic mass?It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus. It is used to consider the total mass of the atom because electrons have a very negligible mass as compared to protons and neutrons.
Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom
While the atomic number represents only the number of the protons present in the nucleus, for example, the atomic number of the carbon atom is six
For example, the atomic mass of the carbon atom is 12 because a single carbon atom has 6 protons as well as 6 neutrons.
Atomic masses do not include masses of electrons is the true statement about atomic mass.
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Sandra wants to know how many students are a part of the business department at her school. She has a list of 240
students' majors. She goes to her record and selects the column for the department and the column with the student
names. She clicks on the Total button and in the Student Name column selects
Average
Count
Maximum
Minimum
Answer:
Count
Explanation:
The count will show you how many students are apart of the business department
Which explains the operation of a hydraulic lift system? A. Archimedes' principle B. Pascal's principle C. Newton's principle D. Bernoulli's principle
Answer: B. Pascal's principle
This is the idea where you compress a liquid on one end of a tube (more or less), and the liquid's pressure is transmitted to the other end to help lift a heavy object. Often the compressing force is downward to take advantage of gravity.
an object that does not allow any light to pass through it is commonly known as
A: Translucent
B: Visible
C: Transparent
D: Opaque
This is not physics fyi this is physical science but it was not on the list
Answer: D: Opaque
Explanation:
Definition of Opaque on Merriam Webster: blocking the passage of radiant energy and especially light
Answer:
opaque
Explanation:
Definition of Opaque on Merriam Webster: blocking the passage of radiant energy and especially light
hope this helps stay safe :)
A town is considering building a biodiesel power plant that would burn biomass to generate electricity. Which of the following correctly lists an advantage and a disadvantage of this project?
A) Advantage: it could help get rid of unwanted waste. Disadvantage: there is no way to use the electricity created.
B) Advantage: it reduces dependence on fossil fuels. Disadvantage: it would emit pollution into the air.
C) Advantage: it is a commonly used energy source. Disadvantage: building the plant would attract new people to the area.
D) Advantage: it would use energy from the sun and wind. Disadvantage: it is a non-renewable source of energy.
Answer:
A ' is the only choice that has a true advantage and a true disadvantage.
Explanation:
hello:)!
I don’t really understand the uniform deceleration too :/
Answer:
Deceleration is the opposite of acceleration.
The mathematical formula for deceleration is:
[tex]Deceleration = \frac{Final velocity - Initial velocity}{Time taken}[/tex]
Uniform deceleration of an object can be defined as decreasing the velocity of an object in equal amount in an equal interval of time.
The graph attached below shows a constant decrease in the velocity with a uniform time interval.
Which of the following elements are in this chemical reaction: Zn (s) + HCl (9) → ZnCl2 (s) + H2 ?
Multiple answers
Α. Η
B. CI
C. Zn
D. nCI
Answer:
A, B and C
Explanation:
You are given the chemical equation.
The chemical reaction:
Zn (s) + HCl (9) → ZnCl2 (s) + H2
The elements involved are
Zinc, hydrogen and Chlorine.
That is, H, Cl and Zn
The Zinc is in solid form
While hydrochloric acid is in aqueous form.
The correct answers are A ,B and C
A 100 N child slides down a frictionless inclined plane as shown in the figure below. Which one of the following statements is true concerning the normal force that the plane exerts on the child?
Answer:
Normal force may be less than weight, if there is some force with a component that acts opposite to the weight force. ... If the pulling force is horizontal, on a horizontal surface, then the normal force is equal to the weight. This is something your chould be able to see from a free-body diagram
Explanation:
Would you have been a Federalist or an Anti-Federalist? Why?
Answer:
Explanation:
I would have been an anti-federalist. They favored a weak central government because they related it to the British tyranny. Federalists believed in a strong central government, almost controlling. I would not have respected this type of government.