The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kgm/s. What is it's
velocity? m/s
Answer:
the velocity is like 17 or something ion even know
Explanation:
For an object sliding at velocity v with a force of friction Fk and a normal force FNs which equation can be usedto calculate the coefficient of kinetic friction?
Answer:
C.
Explanation:
Apex says so
For an object sliding at velocity v with a force of friction [tex]F[/tex] and a normal force [tex]Fn[/tex] , an equation that can be used to calculate the coefficient of kinetic friction [tex]\mu_k[/tex] is
[tex]\mu_k=\dfrac{F}{Fn}[/tex]
What is Kinetic friction?It is a type of resistive force which comes to play when two contacting surfaces have relative motion with respect to each other.
in general, the coefficient of kinetic friction ([tex]\mu_k[/tex]) is slightly less than the coefficient of static friction([tex]\mu_s[/tex]).
The coefficient of kinetic friction is calculated by the mathematical expression
[tex]\mu_k=\dfrac{F}{Fn}[/tex]
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A wave has a frequency of 4.0 Hz. If it is traveling at a velocity of 20 m/s, what is the wavelength of the wave? A. 80 m B. 0.2 m C. 16 m D. 5.0 m
Answer:
D
Explanation:
λ=v/f where λ is wave length
v is speed
f is frequency
The wavelength of the wave is equal to: D. 5.0 meters.
Given the following data:
Frequency = 4.0 HzVelocity = 20 m/sTo determine the wavelength of the wave:
Mathematically, the wavelength of a wave is calculated by using the formula;
[tex]Wavelength = \frac{Speed }{frequency}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Wavelength = \frac{20}{4.0}[/tex]
Wavelength = 5.0 meters
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If you cut a piece of wood in half, each half would have *
1 point
a) Half the density of the original piece
b) Twice the density of the original piece
c) The same density as the original piece
Answer:
c
Explanation:
let's assume that you are splitting the piece of wood horizontally. This would not change the density of the wood at all, only the length. I rest my case. Ur awesome and have an amazing day.
a car starts from rest and accelerated at a rate of 9m/s squared for 6.5 seconds. How much distance was covered by the car?
please explain and give answer if possible
Answer:
58.5 meters
Explanation:
1. Find your formula. Use distance = speed x time for this problem
2. Plug in the given information. d (for distance) = 9m/s^2 * 6.5 s
3. Multiply number AND units. d = 58.5m
4. Check to make sure units & numbers make sense. In this case check that the answer is a lot bigger than what we stated with and that our units go with distance
if an organism reproduces quickly, its population can _____ faster
Answer:
Grow
Explanation:
If an organism is reproducing quickly, the population will grow faster
What distance could a toddler travel if they crawl at a rate of .73 m/s for 20 seconds?
Answer:
14.6 m (meters)
Explanation:
When working with time, and speed.
Use d = st, since s = d/t (just rearanging the formula for speed). d is for distance, t is for time, and s is for speed (velocity with no direction).
To solve for the distance just multiply the rate of speed by the time to get distance.
Given .73m/s is the speed, and 20s is the time.
d = st
d = .73 m/s × 20s
d = .73m × 20
d = 14.6 m
What is the weight of a 200 kg mass?
Answer:
W 1920 N
Explanation:
200kg at a location where g=9.6m/s^2
Which of the following is an example of distance equaling displacement?
A. Mr. Mercer leaves his house and drives to PFHS and then returns home
B. Dr. Wolfe runs away from a dinosaur in a straight line
C. Coach Longchamp jogs one lap around the PFHS track
D. A student leaves class, realizes they forgot their iPhone, then returns to retrieve it.
Answer:
D
Explanation:
The student had displaced their in the class when she left. The phone is what's displaced and student leaving equals distance.
What is a likely direct effect of a community program for local residents?
A. lower education costs
B. higher healthcare costs
C. higher salaries
D. Improved safety for children
Explanation:
improved saftey for children
Answer:
D. Improved safety for children
Explanation:
Select ALL of the situations that describe Newton's Second Law. (There may be more than 1 answer) Question 9 options: A cart is rolling at a constant velocity An apple is in free fall A marble is accelerating down a ramp An ice skater is sliding across frictionless ice A car is at rest A rolling chair is slowing down A roller coaster changes directions
Answer:
Please find the answer in the explanation
Explanation:
Newton 2nd law state that:
The rate of change of momentum is directly proportional to the force applied.
To Select ALL of the situations that describe Newton's Second Law, the correct answers are:
A marble is accelerating down a ramp
If it is accelerating, the velocity will be changing
A rolling chair is slowing down. This also depict the change in momentum
and A roller coaster changes directions
A ball is projected horizontally from the top of a building. One second later, another ball is projected horizontally from the same point, with the same velocity. Will the first ball always be travelling faster than the second one?
The speed of the balls will be same but the time to reach ground will be different.
Final velocity of the ballsThe final velocity of each of the balls will be determined by applying the first kinematic equation as shown below;
Vf = Vi + gt
where;
Vf is the final velocity of the ballsVi is the initial velocity of the ballsg is acceleration due to gravityt is time of motion of the ballFinal velocity of the first ballVf = Vi + 9.8t₁
Final velocity of the second ballVf = Vi + 9.8t₂
Thus, we can conclude that, the speed of the balls will be same but the time to reach ground will be different.
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Which of the following is an example of potential energy?
A kite flying in the sky.
B dog chasing his tail.
C book sitting on a shelf.
D basketball player running down the court.
Answer:
C book sitting on a shelf.
Explanation:
An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position
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Jaime knew that altitude influenced the climate because he lived in the Rocky Mountains at a high altitude. Altitude is a more important factor in climate than latitude in mountainous areas. What relationship exists between altitude and other climate factors? A. An increase in altitude results in higher levels of precipitation. B. An increase in altitude results in an increase in air pressure. C. An increase in altitude results in a decrease in temperature. D. An increase in altitude results in a lessening of wind speed
Answer:
C. An increase in altitude results in a decrease in temperature.
Explanation:
The climate of an area is highly influenced by its altitude especially in mountain areas.
At higher altitudes or mountains, the air molecules above a given surface are fewer that decreases the air pressure in the area and decreases the temperature of the area as well. Because of fewer air molecules, gases absorb very little of the incoming solar radiation and cause decrease in temperature.
Hence, the correct answer is "C. An increase in altitude results in a decrease in temperature."
A rock is thrown upward with a vertical speed of 35 m/s and a horizontal speed of 12 m/s on
level ground. How far away does it land?
Answer:
R = 85.73 m
Explanation:
It is given that,
The vertical speed of a rock, [tex]v_y=35\ m/s[/tex]
The horizontal speed of a rock, [tex]v_x=12\ m/s[/tex]
We know that,
The vertical speed,
[tex]v_y=v\sin\theta=35\ ....(1)[/tex]
Horizontal speed,
[tex]v_x=v\cos\theta=12\ ....(2)[/tex]
Dividing equation (1) by (2) such that,
[tex]\dfrac{v_y}{v_x}=\dfrac{v\sin\theta}{v\cos\theta}\\\\\dfrac{35}{12}=\tan \theta\\\\\theta=\tan^{-1}(\dfrac{35}{12})\\\\\theta=71.07^{\circ}[/tex]
Let v is the initial velocity of the projection. So,
[tex]v=\sqrt{v_x^2+v_y^2} \\\\v=\sqrt{12^2+35^2} \\\\v=37\ m/s[/tex]
We need to find the distance where it will land i.e. the range of the projectile. It is given by the formula as follows :
[tex]R=\dfrac{v^2\sin2\theta}{g}\\\\\text{Putting all the values, we get }\\\\R=\dfrac{37^2\times \sin(2\times 71.07)}{9.8}\\\\R=85.73\ m[/tex]
So, it will land at a distance of 85.73 m.
Today’s temperature of 42 in Chicago set a record high for the month of August.” Which temperature scale is being used? What would be the corresponding temperature on the other two scales?
Answer:
Celsius scale; 315 K; Explanation: The scale used to express the temperature in Chicago in this problem is the Celsius scale.
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Make a claim about the relationship between potential energy, kinetic energy, and speed.What is your evidence?
Answer: When an object falls, its gravitational potential energy is changed to kinetic energy. You can use this relationship to calculate the speed of the object's descent.
There are 24 teeth on the input gear and 6 teeth on the output gear. What is the gear ratio?
Does research lessen its value for its being cyclical? Enumerate Two Possible advantages of a cyclical research
Answer:
Research usually is a cyclical process because it starts with a problem and ends with a problem.
This is bad or lessens the value of the research?
No, because there are problems that in nature are cyclical, (for example the related ones to action research).
And it also may be a good thing, solving one "problem" leads to another problem, but in the process of solving the first one we may win a lot of knowledge, and the same happens with the next one, and so on.
Two possible advantages of cyclical research are:
Knowing beforehand that the research will be cyclical, will allow us to estimate better the amount of time and money needed because we already know (more or less) where to aim.
It also may lead to a better end product, as we already know that we must focus in solving one thing and then we can focus in the next one.
Another possible advantage may be that we know that after the work, there will be a new thing to research, and it is fun, so if you are curious enough this may be a good thing (especially in scientific areas, physics, chemistry, etc).
Prior to science lab, Maria had been drinking a can of soda. When she walked into the lab she set it down on the hot plate at her station. She heard a liquid beginning to boil, and realized that the previous students had forgotten to turn off the hotplate and the boiling noise was from the remaining soda in the can. Without thinking, she picked up the can with her bare hands, and put it upside down into the sink which was half full of liquid. Immediately the can crushed as though it was going to be recycled. What do you think is happening to the soda and air in the can? Support you claim in Question 4, by explaining why you think it is happening. Formulate your hypothesis for the problem. Critique Maria's laboratory safety procedures.
Answer:
The hypothesis as to what happened to the soda and the air in the can are as follows;
The solubility of air in the soda is high at low temperatures, such that air (carbon dioxide, CO₂) is trapped in the soda and when it is drank, it gives it its fresh taste
By placing the can of soda on the hot plate, drives off the air in the soda such that the space directly above the liquid soda is filled with the original air (carbon dioxide), in the soda
By dipping the soda upside down in the sink half filled with water, the soda is cooled down and the air (carbon dioxide) directly above the surface of the liquid soda is reabsorbed into the liquid soda, such that if the lid of the soda is sealed, the vacuum created by the empty space directly above the liquid soda becomes a region of low pressure and the combined pressure from the atmosphere and the liquid level in the sink, causes the can to immediately crushed (deformed).
Explanation:
HELP!!!
7. A block rests on a frictionless table on Earth. After a 20-N horizontal force is applied to the
block, it accelerates at 3.9 m/s^2.Then the block and table are carried to the moon, where the
acceleration due to gravity is 1.62 m/s^2. A horizontal force of 10 N is then applied to the block.
What is the acceleration?
A)2.0 m/s2
B)2.1 m/s2
C)1.8 m/s2
D)2.3 m/s2
E)2.5 m/s2
When throwing curveballs in baseball, is it important to have air hit the ______ part of the ball.
A. smooth
B. rough
C. seam
Answer: A (smooth)
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a major difference between a chemical reaction and a nuclear reaction is?
Explanation:
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.
Google's work^^
I will mark as brainlest
Answer:
Is this science you are talking about
Explanation:
Why do objects fall?
Answer:
gravity
Explanation:
the Forest of gravity causes objects to fall toward the center of the Earth.
Answer:
due to gravitational force.
Scientists have differing views on the origin of the universe. One view suggests the universe is expanding everywhere at the same time. This would mean galaxy clusters must have been closer in the past. Which of the following correctly identifies the proper name given to this thought?
a
Big Bang Theory
b
Doppler Shift
c
Oscillating Model
d
Steady State Theory
A car slows down from 80 km/h to 60 km/h in 2 seconds.
a. Convert both the initial and final velocities into m/s.
b. What is the car’s acceleration in m/s2?
c. What is the distance traveled?
Answer:
please mark brainlist
Explanation:
Initial speed u=80 km/h=80×185=22.22 m/s
Final speed v=60 km/h=60×185=16.67 m/s
Using v=u+at
Or 16.67=22.22+α×5
⟹ a=−1.1 m/s2
The number of electrons in an atom decreases as you move from left to right in the periodic table.
Help please with homework
Answer:
Mhm mhm yes very easy
Explanation:
The answer is 12345678910 and then subtract
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Katie's teacher has given her a sample that contains a mixture of salt, sand, and iron fillings. She is instructed to separate the mixture into the three individual components. What would be the best physical property to focus on for the first step in separating the mixture?
density
electrical conductivity
magnetism
melting point
The best physical property to focus on for the first step in separating the mixture would be magnetism, therefore the correct answer would be option C.
What is a magnetic field?An area where the magnetic force is being applied might be described as a magnetic field. This area could be found around a magnet, magnetic substance, or electric charge.
The magnet's N-pole and S-pole have the strongest magnetic fields for a basic bar magnet. A magnet's north pole serves as the source of the magnetic field, which ends at the south pole.
As given in the problem Katie's teacher has given her a sample that contains a mixture of salt, sand, and iron fillings. She is instructed to separate the mixture into three individual components.
The first step in separating the mixture would be to separate iron fillings with the help of the property of magnetism as iron fillings are the magnetic material. therefore the correct answer would be option C.
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