Answer:
Option (b) is correct.
Explanation:
An object travels down a ramp at a constant acceleration.
Friction force and the gravitational force is there.
(a). It is false. As the friction acts in the opposite direction of motion of the object.
(b). It is true. As the object moves down the ramp so the force of friction is less the component of gravitational force along the ramp.
(c). It is false. the acceleration does not depends on the mass.
a = g sin A - u g cos A
where, A is the angle of inclination and u is the coefficient of friction.
(d). It is false. The normal force is given by
N = m g cos A
so it depends on the mass.
what is the length of x of the side of the triangle below?
Match each date to the correct description.
1. autumnal equinox
June 21
2. vernal equinox
September 22
3. longest day in Northern Hemisphere
December 22
4. longest day in Southern Hemisphere
March 21
June 21: longest day in Northern Hemisphere
December 22: longest day in Southern Hemisphere
September 22: autumnal equinox
march 21: vernal equinox
Answer:
Autumnal Equinox: September 22nd
Vernal Equinox: March 21st
Longest day in the Northern Hemisphere: June 21st
Longest day in the Southern Hemisphere: December 22nd
Explanation:
I hope this helps! <3
what is hydrofluorocarbon
Answer:
Hydrofluorocarbons (HFCs) are man-made organic compounds that contain fluorine and hydrogen atoms, and are the most common type of organofluorine compounds. Most are gases at room temperature and pressure.
Answer:
Hydrofluorocarbons (HFC) are man-made organic compounds that contain fluorine and hydrogen atoms and are the most common type of organofluorine compounds. Most are gases at room temperature and pressure. HFCs are produced synthetically and are used primarily as refrigerants. In general, they are relatively non-flammable, chemically stable, and nonreactive.
Động cơ khởi động của một ô tô bị quay chậm , thợ cơ khí quyết định phải thay động cơ , dây cap hoặc acquy. Hướng dẫn sử dụng nói rằng acquy 12v phải có điện trở 0.002 ( ôm) , động cơ có điện trở không quá 0.2 (ôm) và dây cáp có điện trở không quá 0.04 ( ôm) , thợ cơ khí cho động cơ chạy đo được là 11,4v trên acquy , 3v trên cáp và dòng bằng 50 A , vậy phần nào bị hỏng ?
Answer:
Việc nắm được các thông số của bình ắc quy cho xe máy sẽ giúp bạn ... Khi di chuyển với tốc độ chậm hoặc gặp phải tắc đường, đối với xe có ... sau: ắc quy có điện áp 12V, CCA = 600, có nghĩa là ắc quy có thể cung cấp
Explanation:
Question 23 of 33 Which phrase best describes when kinetic friction occurs? A. When two surfaces are moving relative to each other B. When one object is resting on another C. When two surfaces are in contact but not moving relative to eatn other D. When balanced forces are acting on an object
Answer:
A. When two surfaces are moving relative to each other.
Explanation:
It is also know as dynamic friction
State the relation between acceleration and momentum
Answer:
Acceleration is the rate of change of velocity. Momentum is the mass times the velocity. So if you multiply the mass times the acceleration, you get the rate of change of momentum
Research indicates that genetics does not influence levels of aggression.
Please select the best answer from the choices provided
True or
False
Answer:
False
Explanation:
Took the test and got a 100%
The statement " Research indicates that genetics does not influence levels of aggression." is False.
What is genetics?Genetics is the branch of biology that studies genes, heredity, and genetic variation in living organisms. It involves the study of how traits and characteristics are passed down from one generation to another through the genetic material, such as DNA, that is contained in the chromosomes of cells. Genetics plays a crucial role in understanding the development, growth, and functioning of organisms, as well as the causes and treatment of genetic diseases.
Here in the Question,
The statement that "genetics does not influence levels of aggression" is not entirely accurate. While there is no single gene that determines aggressive behavior, research has shown that genetics can play a role in influencing aggression.
Studies have found that certain genes are associated with increased risk for aggressive behavior, including those involved in the regulation of neurotransmitters such as serotonin and dopamine, which are known to affect mood and behavior. Additionally, environmental factors can interact with genetic factors to increase or decrease the expression of genes that influence aggression.
So, it is important to note that genetics is not the sole determinant of aggression. Environmental factors, such as childhood experiences, exposure to violence, and social and cultural influences, also play a significant role in shaping behavior.
Therefore, it is more accurate to say that aggression is a complex interplay between genetic and environmental factors.
To learn more about genes click:
https://brainly.com/question/29762819
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What do different forms of energy have in common?
A. They can push or pull on objects.
B. They give objects mass.
C. They can cause changes in matter.
D. They can cause objects to move.
Answer:
C because it changes your energy
A solid sphere a solid cylinder, and a hoop each have the same mass and radius. If they are spinning at the same angular velocity, which one has the greatest rotational kinetic energy
Answer:
KE = 1/2 I * w^2 where I = moment of inertia and w the angular velocity
The hoop has all of it mass at a distance of R from the axis of rotation,
I = M R^2 for the hoop, the others have values of I that are less that of the hoop.
A _____ is used to make magnifying glasses.
convex mirror
concave lens
plane mirror
convex lens
concave mirror
You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12 angle with the horizontal. As you face the window (0.90 m high, 2.0 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window corner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall
Questions Diagram is attached below
Answer:
[tex]T=2.08s[/tex]
Explanation:
From the question we are told that:
Speed of Train [tex]V=3.0m.s[/tex]
Angle [tex]\theta=12\textdegree[/tex]
Height of window [tex]h_w=0.90m[/tex]
Width of window [tex]w_w=2.0m[/tex]
The Horizontal distance between B and A from Trigonometric Laws is mathematically given by
[tex]b=\frac{0.9}{tan12}[/tex]
[tex]b=4.23[/tex]
Therefore
Distance from A-A
[tex]d_a=2.0+4.23[/tex]
[tex]d_a=6.23[/tex]
Therefore
Time Required to travel trough d is mathematically given as
[tex]T=\frac{d_a}{v}[/tex]
[tex]T=\frac{6.23}{3}[/tex]
[tex]T=2.08s[/tex]
A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is Group of answer choices Zero down the hill and greater than the weight of the car. down the hill and equal to the weight of the car up the hill and equal to the weight of the car. up the hill and greater than the weight of the car.
Answer:
Zero
Explanation:
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
Mathematically, net force is given by the formula;
[tex] Fnet = Fapp + Fg[/tex]
Where;
Fnet is the net force.
Fapp is the applied force.
Fg is the force due to gravitation.
In this scenario, a stalled car is being pushed up a hill at constant velocity by three people. Thus, the net force on the car is zero because all the forces acting on any physical object is equal to zero and represents a constant velocity; by balancing or cancelling each other out.
According to Sir Isaac Newton's First Law of Motion which is known as Law of Inertia, it states that an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
A car starting from rest has a constant acceleration of 4 meters per second per second. How fast will it be going in 5 seconds?
Answer:
18 m
Explanation:
Given : vo = 0 m/s ; t = 3 s; a = 4 m/s^2 ; d = ? m ; average velocity = ? m/s ; fonal velocity = ? m/s
solving for the final velocity, v
v = a * t
v = 4 m/s^2 * 3 s
v = 12 m / s
Solving for the average velocity. avg v
avg v = (vo + v) / 2
avg v = (0 m / s + 12 m/s) / 2
avg v = 6 m / s
Solving for the distance traveled after 3 s
d = avg v * t
d = 6 m / s * 3 s
d = 18 meters
In the first 3s the car travels 18 meters.
If a car starting from rest has a constant acceleration of 4 meters per second per second, then it would be going at a speed of 20 m / s.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2 × a × t²
v² - u² = 2 × a × s
As given in the problem, a car starting from rest has a constant acceleration of 4 meters per second per second,
By using the first equation of the motion,
v = u + at
v = 0 + 4 × 5
v = 20 m / s
Thus,If a car starting from rest has a constant acceleration of 4 meters per second per second, then it would be going at a speed of 20 m / s.
To learn more about equations of motion here, refer to the link given below ;
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How does image differ from shadow?
Answer:
Image is formed by the reflection of light rays by an object. Image has the colour of the object. ... Shadow is formed by the obstruction of light by an opaque object. Shadow is always black.
Image is formed by the reflection of light rays by an object. Image has the colour of the object.
Shadow is formed by the obstruction of light by an opaque object. Shadow is always black.
Ftension = 120 N
10 kg
Fg
What is the weight (not mass) of the box?
O 10 kg
0 19 N
Ô 98 N
O 98 kg
Answer:
98Kg
Explanation:
What is the voltage drop across the 10.0 alpha resistor
Answer:
wow so cool the answer is vr 10
true or False? PLEASE HELP ME
Answer:
a. True - Joules is the unit measure for energy.
b. False - Potential energy is associated with position
c. False - Kinetic energy is associated with movement.
d. False - It's climbing, which means it also has kinetic energy.
The current in the wire (blue) is directed to the right. A conducting loop (green) is in the plane of the wire. The current is increasing with time. Find the direction of current in the conducting loop, if any.
Image of the blue and green wire is missing, so i have attached it.
Answer:
Counterclockwise
Explanation:
We are told that the current is increasing with time. Now, if the current is increasing, it means that the flux going through the wire loop will also be increasing.
Now, according to Lenz law of electromagnetic induction, from the right hand rule, the right thumb points In the counterclockwise direction and so the current will flow in the anti clockwise direction to counter the effect of the magnetic filed being projected outside the loop.
A good-quality measuring tape can be off by 0.58 cm over a distance of 22 m. What is its percent uncertainty
Answer:
22 m = 2200 cm
.58 / 2200 = .00026 = .026 %
Percent error = +_ .026
a 4 kg block of iron weighs about
a.) 4 N
b.) 40 N
c.) 0.4 N
d.) more than 400 N
Answer:
40 N
Explanation:
[tex]w = mg \\ w = 4 \times 9.81 \\ w = 39.24 = 40 \: [/tex]
Atoms of elements in the same group have the same
Explanation:
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
Look at the graph and extrapolate how many baskets were made by the team at 8.5 minutes.
A.
3
B.
1
C.
23
D.
24
What are possible units for impulse? Check all that apply.
▪️kg•m
▪️kg• m/s
▪️N•s
▪️N•m
▪️N•m/s
Answer:
kg.m/s
Explanation:
it is a division of a mass and a speed
A hovering mosquito is hit by a raindrop that is 45 times as massive and falling at 8.2 m/s , a typical raindrop speed. How fast is the raindrop, with the attached mosquito, falling immediately afterward if the collision is perfectly inelastic
Answer:
The speed of the raindrop and the mosquito is 8.02 m/s.
Explanation:
mass of mosquito = m
mass of drop = 45 m
initial velocity of mosquito, u = 0 m/s
initial velocity of drop, u' = 8.2 m/s
During the inelastic collision, the momentum of the system is conserved.
Let the speed of rain drop and the mosquito is v.
Use the conservation of momentum
m x u + 45 m x u' = (m + 45 m) v
m x 0 + 45 m x 8.2 = 46 m x v
v = 8.02 m/s
Which of the following statements is NOT true?
Answer:
D
Explanation:
hope i helped ya :D
Answer: The magnetic poles of Earth are at the same locations of as the geographic poles is false.
Explanation:
A car is traveling at a constant speed of 33 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 2.5 km away
Answer:
0.8712 m/s²
Explanation:
We are given;
Velocity of first car; v1 = 33 m/s
Distance; d = 2.5 km = 2500 m
Acceleration of first car; a1 = 0 m/s² (constant acceleration)
Velocity of second car; v2 = 0 m/s (since the second car starts from rest)
From Newton's equation of motion, we know that;
d = ut + ½at²
Thus,for first car, we have;
d = v1•t + ½(a1)t²
Plugging in the relevant values, we have;
d = 33t + 0
d = 33t
For second car, we have;
d = v2•t + ½(a2)•t²
Plugging in the relevant values, we have;
d = 0 + ½(a2)t²
d = ½(a2)t²
Since they meet at the next exit, then;
33t = ½(a2)t²
simplifying to get;
33 = ½(a2)t
Now, we also know that;
t = distance/speed = d/v1 = 2500/33
Thus;
33 = ½ × (a2) × (2500/33)
Rearranging, we have;
a2 = (33 × 33 × 2)/2500
a2 = 0.8712 m/s²
Which three gasses that contribute most to Climate Change?
ans) 1.Green House gasses 2. carbon dioxide 3.nitrious gases
Answer:
Water vapor.
Carbon dioxide.
Methane.
Ozone.
Nitrous oxide.
Chlorofluorocarbons.
Explanation:
thank me later
What do the planets Saturn, Neptune, and Uranus have in common?
A. They are all smaller than Earth.
B. They are the closest to the Sun.
C. They are all outer planets.
D. They are all inner planets.
Answer:
they are all outer planets
whats this spell? cause i have no clue
This is trying to show you that if you know the rules of the code, you can figure out the whole message from only having a part of it.
In this picture, the rules of the code are how the letters are formed.
This is an important concept for communication. It's related to the questions of
. . . Can you understand a person on the phone if there's also static or noise mixed with his voice ?
. . . Can you accurately decode a digital message made of 1's and zeroes, even if some of them are missing, or got reversed on the way to you ?
The answer to both of these questions is 'Yes, you can. If you have ENOUGH of the message, you can fill in the missing parts.'.
In this case, I hate to say it, but I don't think the question gives us enough of the message for us to be able to fill in the missing part. Maybe some people can look at this and understand what it says, but I can't.
To show you a better example of how you can fill in the whole message when part of it is missing, I made my own, and it's attached to this answer.
A trumpet player hears 5 beats per second when she plays a note and simultaneously sounds a 440 Hz tuning fork. After pulling her tuning valve out to slightly increase the length of her trumpet, she hears 3 beats per second against the tuning fork. Was her initial frequency 435 Hz or 445 Hz? Explain.
Answer:
her initial frequency is 445 Hz
Explanation:
Given;
initial beat frequency, [tex]F_B[/tex] = 5
observed frequency, F = 440 Hz
let the initial frequency = F₁
F₁ = F ± 5 Hz
F₁ = 440 Hz ± 5 Hz
F₁ = 435 or 445 Hz
This result obtained shows that her initial frequency can either be 435 Hz or 445 Hz
The last beat frequency will be used to determine the actual initial frequency.
F = v/λ
Frequency (F) is inversely proportional to wavelength. That is an increase in length will cause a proportional decrease in frequency.
This shows that the final frequency is smaller than the initial frequency because of the increase in length.
Initial frequency - frequency of tuning fork = 5 beat frequency
Reduced initial frequency - frequency of tuning fork = 3 beat frequency
Initial frequency = 5Hz + 440 Hz = 445 Hz
Final frequency (Reduced initial frequency) = 440 + 3 = 443 Hz
Check: 445 Hz - 440 Hz = 5 Hz
443 Hz - 440 Hz = 3 Hz