Answer:
25 minutes
Explanation:
Plz Help 100 points
Cool air moves from an air conditioning unit to the rest of a room in a process called ____________.
Explanation:
Ventilation
A ball is thrown straight up with a velocity of 16 m/s; what will be its velocity 2.0s after being released?
Answer:
The ball will be travelling downward with a speed of 9.8 m/s.
Explanation:
The ball will be travelling downward with a speed of 9.8 m/s.
Explanation:
The acceleration of the ball will be a constant
9.8 m s 2
(downward), regardless of whether the ball is travelling upward or downward.
The equation that makes this calculation simplest is
v f = v i − g ( Δ t )
where the negative sign has been used to account for the opposite directions of v i and g . After 3 seconds, v f = 19.6 − ( 9.8 ) ( 3 ) = 19.6 − 29.4 = − 9.8 m s
The negative result tells us that the ball is on its way downward by this time (consistent with our choice of a negative value for the downward acceleration of gravity).
When the Northern hemisphere is tilted towards the sun, it is ___ in the northern hemisphere and ___ in the southern hemisphere
Summer in the northern
Winter in the southern
A change in position of an object relating to time
Answer:
Speed describes how far an object moves in a given amount of time (for example, miles per hour).
Explanation:
If a race car wants to change its velocity then a net force is
required to cause the necessary
Answer:acceleration
Explanation:
We define acceleration as the rate of change of velocity. So if a moving object wants to change its velocity, it needs to accelerate.
Thus the statement would be:
"If a race car wants to change its velocity then a net force is required to cause the necessary acceleration".
--------------------------------
Acceleration defines how the velocity changes, suppose that you are in one dimension and you move with positive velocity, if you have also positive acceleration your velocity will increase.
If you have negative acceleration your velocity will decrease.
But if we go to 2 dimensions we can see that acceleration is way more complex, because it is what allows the changes of direction of motion (by changing the direction of the velocity).
Now, acceleration comes from Newton's second law of motion:
F = m*a
Force equals mass times acceleration.
Then if we know that a car wants to change its velocity, it needs to apply a force such that it causes the necessary acceleration to change the velocity as wanted.
From this we can see that the complete statement would be:
"If a race car wants to change its velocity then a net force is required to cause the necessary acceleration"
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A high-speed train travels with an average speed of 227 km/hr. The train travels for 2 hrs. How far does the train travel?
Answer: The answer would be 454 miles.
Explanation: You multiply the average speed by time travelled
A car moves a distance of 2400 meters in 55 seconds What is the speed of
the car?
[tex]v = \frac{covered \: distance}{time \: of \: the \: covered \: distance} \\ [/tex]
[tex]v = \frac{2400}{55} \\ [/tex]
[tex]v = \frac{24 \times 100}{5 \times 11} = \frac{24 \times 20}{11} = \frac{480}{11} \\ [/tex]
[tex]v = 43.63 \: \: \frac{m}{s} [/tex]
_________________________________
And we're done...
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Answer:
The average speed is about 44 m/s
Step by Step:
[tex]S= \frac{distance}{time}\\ d= 2400m\\t = 55 seconds\\\\\frac{2400m}{55 seconds}\\\\= approximately\\ 44 m/s[/tex]
I hope you found this helpful
Which of the following are conditions required for static equilibrium? Select TWO answers. Elimination Tool A Linear Momentum = →p=0. B:Angular Momentum = →L=0. C:Change in Energy = ΔEtotal=0. D: Net Force ≠0.
Answer:
The correct answers are Choices 'A' and 'B'.
Explanation:
The correct answers are Choices 'A' and 'B'.
Static equilibrium means that the object is not moving relative to a given frame of reference.
Choice 'A' Linear Momentum = →p=0
is required. "Not moving" means the velocity
v must be 0(otherwise the object would be moving across the reference frame), so an object's linear momentum (which is its mass times its velocity) must be 0.
Choice 'B' Angular Momentum = →L=0 is required. "Not moving" also means that the object can not be rotating or spinning inside the reference frame, which means the rotational velocity ω must be 0. So an object's angular momentum (which is its mass times its rotational velocity) must be 0 .
Choice 'C' Change in Energy is true (this is known as conservation of energy), but it is not a requirement of static equilibrium because "not moving" is not the same as "isolated."
There are many forms of energy, many of which are not related to movement. For example, a light bulb in a stationary lamp is in static equilibrium, but if the light is turned on .
Similarly, when you add gasoline to your car at a gas station, the car must be in static equilibrium, but the addition of the gasoline from outside the car changes the Total Energy of the car.
Choice 'D' Net Force ≠0 is a non-equilibrium condition because by Newton's second law of motion, so any non-zero net force will cause an acceleration, and acceleration is not a state of static (or dynamic) equilibrium.
The director of the swimming program at the YFCA wanted to try out a new method of teaching. For half the summer session he told his instructors to use their usual teaching methods. Then half way through the summer he had all the instructors switch to his new method. Between the middle and end of the summer a significant portion of the students showed marked improvement. What is the independent, and dependent variable, and confound.
Answer:
Independent variable: method of teaching.
Dependent variable: summer sessions.
confound variable: improvement.
Explanation:
Independent variable is described as a variable that is being manipulated and changed in order to see its effect on the dependent variable. The dependent variable is directly affected by the independent variable.
The dependent variable is described as a variable that is being tested by an experimenter in particular research or experiment.
Confound variable is determined as a "third variable" in an experiment which is responsible for examining an already existing "cause-and-effect" relationship.
need help this is timed
Viscous lidocaine 2% 30 mL Maalox (do not substitute Kaopectate) 60mL Diphenhydramine (use on hand stock 12.5mg/5mL elixir) 75 mg Carafate 1gm/10mL 40 mL The doctor wants the patient to use a daily dose of 2 teaspoons. How many doses are in the final product?
Answer:
There are approximately 16 dozes in the final product
Explanation:
The given parameters are;
The viscous lidocaine 2% 30 mL + Maalox 60mL + Diphenhydramine (12.5 mg/5mL elixir)75 mg + Carafate 1gm/10mL 40mL
The total volume becomes;
30 mL + 60 mL + 5 × 75/12.5 mL + 40 mL = 160 mL
1 Teaspoon = 4.928922 mL
Therefore, 2 teaspoon = 2 × 4.928922 mL = 9.857843 mL
Which gives;
The number of doses in 160 mL = 160 mL/(9.857843 mL) = 16.2307312 doses
Which is approximately 16 doses
Therefore, there are approximately 16 dozes in the final product.
the unit of mass is fundamental unit
Answer:
Kilogram and symbol kg.
whats this symbol?
∑
If you walk 90 meters and you complete the walk in 50 seconds what is your speed?
Answer:
i think this is the answer
Explanation:
If I am throwing a bowling ball off a roof and a watermelon off a roof at 30
feet, which object do you think will have more energy?
Answer:
Th ball
Explanation:
I need help for this displacement question.
Answer:
577656.0
Explanation:
How do I answer number 5?
Answer:
He needs to throw the trash before he gets to the Trash can because he
needs some force for it to be able to go in because it he throw it after he passed it, it would not make it because your going a certain speed, and if you try to throw it when it is right in front of you, it will still miss because it is still going the same speed as the car.
Explanation:
Hope that helps you :)
The worker’s pull on the handle of the cart can best be described as a force having
Group of answer choices
magnitude, only
neither magnitude nor direction
direction, only
both magnitude and direction
Answer:
both magnitude and direction
Explanation:
The worker's pull on the handle of the cart is best described as the force having both magnitude and direction.
This is a vector quantityThe force is channeled to move the cart in a specific direction. Also, the pull on the cart can be quantified, and so it have magnitude. Most physical properties either have magnitude or direction or both.In this case, the worker is pulling the cart towards a specified direction.
Therefore, the fitting choice is both magnitude and direction.
jet aeroplanes and rockets work on the principal of newton's third law of motion. explain. fast I will mark brainly
Answer:
Explanation:
According to Newton's third law of motion, every action has an equal and opposite reaction. When a rocket starts, it releases some gases which exerts and equal and opposite force which helps the rocket to move.
Hope this helps
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How long will it take a ball to roll 20 meters along the floor at a speed of 0.4 m/s
In 1996, Michael Johnson ran 200.0 m in 19.32 s. Johnson's mass at the time
of his record-breaking run was about 77 kg. What was his momentum at his
average speed?
================================================
Work Shown:
velocity = (change in distance)/(change in time)
velocity = (200.0 meters)/(19.32 seconds)
velocity = (200.0/19.32) meters per second
velocity = 10.351966873706 meters per second
velocity = 10.35 m/s after rounding to 4 sig figs
------------------
Momentum = (mass)*(velocity)
Momentum = (77 kg)*(10.35 m/s)
Momentum = (77*103.5) kg m/s
Momentum = 796.95 kg m/s
------------------
Edit: Corrected from 2000.0 to 200.0
HELP
What’s the input and output force of a stapler
:)
Answer:
The input force is the force that when you push down and the output force is the stable going into the paper.
Explanation:
I really hope this helps ;)
Answer: yes
Explanation:
because so
Are there differences in how the size/radius changes over time, when you compare stars with different initial masses?
What is the average speed (in miles per hour) of the car that traveled a total of 200 miles in 5.5 hours
Answer:
Average speed of the car is 36.36 miles per hour
Explanation:
It is given that,
Total distance traveled by the car, d = 200 miles
Total time taken, t = 5.5 hours
In this case, we have to find the average speed of the car. Average speed of the car is defined as the total distance divided by total time taken. Mathematically, it can be written as :
s = 36.36 miles per hour
Hence, the average speed of the car is 36.36 miles per hour. \
Trace the changes that take place in a flower from gamete formation to fruit
formation.
5
36 In the given circuit, A, B, C and D are four lamps connected with a battery of
60V.
Analyse the circuit to answer the following questions.
(i) What kind of combination are the lamps arranged in (series or parallel)?
(ii) Explain with reference to your above answer, what are the advantages (any
two) of this combination of lamps?
(iii) Explain with proper calculations which lamp glows the brightest?
(iv) Find out the total resistance of the circuit.
Pollination is the transfer of pollen for plant fertilization
The correct responses are as follows;
The description of the changes that take place is included in this response
6 (i) The circuit arrangement is a parallel circuit arrangement
(ii) The advantages are;
Brighter bulbsHigher uptime of the bulbs(iii) Lamp C glows the brightest
(iv) The total resistance is 4 Ω
The reason roe the above responses are as follows:
During the course of pollination, the pollen, through movement, finds it way to the germ-cell in the female ovary, where it fuses with the female egg (gamete) located inside the ovule
The resulting fertilization produces the zygote, which forms an embryo inside the ovule by dividing several times
A seed is formed from the ovule when it develops a tough coat, and by rapid growth a fruit is formed as the ovary matures
5 (i) The kind of combination, where all the wires that enters the bulb are joined on one side of the bulbs, and all the wires that comes from the bulbs are joined on the other end of the bulb, before joining the circuit is a parallel connection
(ii) The advantages of bulbs connected in parallel are;
The voltage available in the power source reaches all the bulbs. That is each bulb had the voltage of the power source across it and therefore, is brighter than when the bulbs are arranged in seriesOther bulbs remain functional following the disconnection of one of the bulbs or loops(iii) The bulb that glows brightest is given by the bulb that consumes the most energy per unit time, and therefore, the bulb that has the most power
Power consumed by each bulb is given as follows;
Bulb A, [tex]P_A[/tex] = 3 A × 60 V = 180 W
Bulb B, [tex]P_B[/tex] = 4 A × 60 V = 240 W
Bulb C, [tex]P_C[/tex] = 5 A × 60 V = 300 W
Bulb D, [tex]P_D[/tex] = 3 A × 60 V = 240 W
The highest power used by a bulb is 300 W, by bulb C
Therefore;
Bulb C is the brightest bulb
(iv) The total resistance of the circuit is given as follows;
[tex]Total \ resistance =\dfrac{Circuit \ voltage}{Total \ current}[/tex]
Total current, [tex]I_{tot}[/tex] = 3 A + 4 A + 5 A + 3 A = 15 A
Circuit voltage, V = 60 V (Given)
Therefore, we have;
[tex]Total \ resistance =\dfrac{60 \, V}{15 \, A} = 4 \, \Omega[/tex]
The total resistance is 4 Ω
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why do some objects fall faster than others?
Answer:
Weight and Mass !!!!!!
Explanation:
Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and brick dropped together. Air resistance causes the feather to fall more slowly.
Susie estimated that she can run for hours at a steady speed of 8m/h. She enters a
marathon, a distance of 26meters. How long should it take her to complete the race?
Time = (distance) / (speed)
Time = (26 meters) / (8 meters/hour)
Time = 3.25 hours or 3 hours 15 minutes
A car moving at 30 m/s has 900 kj of kinetic energy. What is the car’s mass?
If a car moving at 30 m / s has 900 kJ of kinetic energy, then the mass of the car would have been 2000 kilograms.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.
As for the given problem, we have to find out the mass of the car if the car moving at 30 m/s has 900 kJ of kinetic energy.
Kinetic energy = 1 / 2 m v²
900000 = 0.5 × m × 30²
m = 1000 / 0.5
= 2000 kilograms
Thus, If a car moving at 30 m / s has 900 kJ of kinetic energy, then the mass of the car would have been 2000 kilograms.
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a ball weighs 0.25 kg and is moving at 15 m/s. what is the momentum of the ball?
Answer:
The answer is 3.75 kgm/sExplanation:
The momentum of an object given it's mass and velocity can be found by using the formula
momentum = mass × velocityFrom the question
mass = 0.25 kg
velocity = 15 m/s
We have
momentum = 0.25 × 15
We have the final answer as
3.75 kgm/sHope this helps you
11. When gathering glassware and equipment for an experiment, you should
a. Read all directions carefully to know what equipment is necessary
b. Examine all glassware to check for chips or cracks.
C. Clean any glassware that appears dirty
d. All of the above
Answer:
C
Explanation:
Option D is the correct answer.
What are the importance when gathering glassware and equipment for experiment?Usually in the research labs there were some rules and we have follow those for our safety measures. Some importance rules while doing experiments were:
Flammable materials should be used in open.Always must use the experimental equipment given.While gathering we must read all directions carefully to know the necessary of the equipment.Glassware should be checked whether it's broken or not before using the equipment.All the glassware and equipment using for experiment must be clean.Should ask our lead or instructor before and after the experiment.While using a test tube we should be away from other people.We should use tongs before picking up the heating material and heated equipment.For any clarifications and doubts we should always ask and listen to the instructor.Hence, option D is the correct answer.
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