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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How long will it take a ball to roll 20 meters along the floor at a speed of 0.4 m/s
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. \
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
plz mark as brainliest!!!!!!
the unit of mass is fundamental unit
Answer:
Kilogram and symbol kg.
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
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.
A college student walking on a sidewalk throws his keys to a friend on a balcony 6m above him. If the college student throws the keys upward at 9.4 m/sec, can his friend on the balcony catch the keys? If not, what distance will the keys reach?
Only for people who know the answer to this question fully can answer this others please leave this question.So, Variation is caused by what two factors...????
PLEASE ANSWER IF YOU KNOW 100% TO THE ANSWER OF THIS QUESTION ...Thanks
Answer:
Please elaborate which variation. There are different types of variation
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
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:
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.
Identify all the forms of energy in the picture below
identify thermal energy, mechanical energy, radiant energy, electrical energy, sound energy, and chemical energy
Answer:
we are going to focus on just a few. • Heat energy ( Thermal). • Mechanical energy. • Light (Radiant) energy. • Electrical energy. • Sound energy. • Chemical energy
PLEASE HELP I NEED THIS DONE BY 11:59!
After how long do the cars pass each other???
Answer:
They pass after roughly 5 hours and 35 minutes.
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...
♥️♥️♥️♥️♥️
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
John is riding the bus to the next samuell football game. The bus is traveling to the right at 20 m/s and Jon is walking towards the back (left) of the bus at 5 m/s. What is Jon’s relative velocity to a stationary observer?
Answer:
Vrel_jon's = 15 [m/s] to the right
Explanation:
Relative velocity is defined as the relative motion between two bodies, taking into account the directions of motion.
Relative velocity is defined as the relative motion between two bodies, taking into account the directions of motion. The relative velocity is defined as the algebraic sum of the velocities, if the movements are opposite the vectors are subtracted, as will be done below.
Vrel = 20 - 5 = 15 [m/s]
A person watching Jon sees him moving to the right at a speed of 15 [m/s]
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
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).
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.
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:
Your body temperature begins to rise during strenuous exercise in hot weather. Specialized nerve cells on the skin detect an increase in temperature; your brain detects an increase in blood temperature. You begin to sweat and as the sweat evaporates, more latent heat of vaporization is removed from your body and you cool down. In this case, your skin and brain acts as ________________ in maintaining homeostasis.
Answer:
receptors
Explanation:
In this case, your skin and brain act as receptors in maintaining homeostasis. These receptors are monitors in different parts of an organism's body that are there to detect specific changes that occur and activate very specific responses in order to counteract these changes and maintain a very stable system. This is exactly, what your skin and brain are doing in this scenario, they detect the change in temperature and counteract its effects through sweat which ultimately causes the opposite effect and maintains equilibrium in your body.
Assume that a scale is in an elevator on Earth.
what force would the scale exert on a 53-kg person
standing on it during the following situations?
(use Fnet = ma and F = mg and g = 10m/s^2)
a. The elevator moves up at a constant speed.
b. It slows at 2.0 m/s^2 while moving upward.
C. It speeds up at 2.0 m/s^2 while moving downward.
d. It moves downward at a constant speed.
Blank 1:
Blank 2:
Blank 3:
★ Remember :
The reading of scale of a man in an elevator :
When the elevator moves upward with acceleration a, R = m(g + a)When the elevator moves downwards with acceleration a , R = m(g - a)When the elevator falls freely, we take a = g so, R = m(g - g) = 0When the lift is at rest or moves with uniform velocity, a = 0, so R = m(g - 0) = mgA). The elevator moves up at a constant speed[tex].[/tex]
∴ Acceleration of elevator = 0
➠ R = mg
➠ 53 × 10
➠ R = 530N
B). It slows at 2m/s² while moving upward.
∴ Acceleration of elevator = -2m/s²
[Negative sign shows that speed decreases with time]
➠ R = m(g + a)
➠ R = 53(10 + (-2))
➠ R = 53 × 8
➠ R = 424N
C). It speeds up at 2m/s² while moving downward.
∴ Acceleration of elevator = 2m/s²
➠ R = m(g - a)
➠ R = 53(10 - 2)
➠ R = 53 × 8
➠ R = 424N
D). It moves downward at constant speed.
∴ Acceleration of elevator = 0
➠ R = mg
➠ R = 53 × 10
➠ R = 530N
Hope It Helps!(a) When the elevator moves up with a constant speed, the force on the scale is 519.4 N.
(b) When the elevator slows down at 2 m/s² while moving up, the force on the scale is 625.4 N
(c) When the elevator speeds up at 2 m/s² while moving down, the force on the scale is 413.4 N.
(d) When the elevator moves down at constant speed, the force on the scale is 519.4 N.
The given parameters;
mass of the person , m = 53 kgThe force that scale must exert on the person is calculated as follows;
F = mg + ma
F = m(a + g)
(a)
When the elevator moves up with a constant speed, the acceleration is zero.
F = m(0 + g)
F = mg
F = 53 x 9.8 = 519.4 N
(b)
When the elevator slows down at 2 m/s² while moving up;
F = m(a + g)
F = 53(2 + 9.8)
F = 625.4 N
(c)
When the elevator speeds up at 2 m/s² while moving down;
F = m(g - a)
F = 53(9.8 - 2)
F = 413.4 N
(d)
when the elevator moves down at constant speed;
F = m(g - a)
F = 53(9.8 - 0)
F = 519.4 N
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Plz Help 100 points
Cool air moves from an air conditioning unit to the rest of a room in a process called ____________.
Explanation:
Ventilation
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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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:
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.
I need help for this displacement question.
Answer:
577656.0
Explanation:
Are there differences in how the size/radius changes over time, when you compare stars with different initial masses?
An object is dropped from rest.
What is its instantaneous speed when it has
been in motion for 3 s? The acceleration of
gravity is 9.8 m/s
2
.
Answer in units of m/s.
Answer:
29.4m/s
Explanation:
Given parameters:
Duration of motion = 3s
Acceleration due to gravity = 9.8m/s²
Unknown:
Instantaneous speed = ?
Solution:
Instantaneous speed is the speed at an instant or a particular time.
Since initial speed = 0 because it was at rest, the best motion equation to solve this problem is given as;
V = U + gt
Where V is the instantaneous speed
U is the initial speed
g is the acceleration due to gravity
t is the time taken
Insert the parameters and solve;
V = 0 + 9.8 x 3 = 29.4m/s
