Answer:
Average speed = 40.50 km/h (Approx)
Explanation:
Distance = Time × Speed
Total distance = (40/60) 50 + (8/60) 70 + (35/60) 35
Total distance = 33.33 km + 9.33 km + 20.17 km
Total distance = 62.80 km
Average speed = Total distance / Total time taken
Average speed = 62.80 / [(40+8+35+40)/60]
Average speed = 62.80 / 1.55
Average speed = 40.50 km/h (Approx)
What allows negative feedback to control a system?
A. The system slows down when input is reduced.
B. The system speeds up when output is increased.
C. The system has parts that sense the amount of input O
D. The system has parts that sense the amount of output.
Answer: It's D.
Explanation:
I just did it.
The system has parts that sense the amount of output, allows negative feedback to control a system. Option D is correct.
What is system?A system is a collection of interconnected or interacting pieces that follow a set of rules to produce a coherent whole.
The limits, structure, and purpose of a system, which is surrounded and impacted by its environment, are characterized and expressed in its functioning.
A feedback system helps the system to work in the productive way. Negative comments might help you get back on track. It allows you to view projects and activities in a new light.
It allows you to learn, grow, and improve anything from your own talents to the project you're working on right now.
The system has parts that sense the amount of output, allows negative feedback to control a system.
Hence, option D is correct.
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hey can anyone pls help me out in dis!
Answer:
A. Liquid becomes a gas.
Answer:
A
Explanation:
Water changes to liquid because hydrogen bonds are constantly formed and broken as the water molecules slide past each other. The breaking of these bonds is caused by the motion (kinetic energy) of the water molecules due to the heat contained in the system.
How can positive feedback influence the stability of a system?
A. It can cause the system to remain stable as long as inputs are
constant
B. It can cause the system to oscillate between stability and
instability
c. It can cause instability that eventually results in the system's
destruction
D. It can cause instability by reversing the direction of the system,
The positive feedback influence the stability of a system is: It can cause the system to remain stable as long as inputs are constant. Hence, option (A) is correct.
What is stability ?A body's capacity to return to its initial static equilibrium after being slightly shifted is referred to as stability.
A body in equilibrium doesn't suffer linear acceleration or a turning effect, and unless a force from the outside disturbs it, it will stay in that state forever. (The First Law of Newton)
When tiny, externally induced displacements from an equilibrium result in forces or torques that tend to oppose the displacement and bring the body back to its initial equilibrium, the equilibrium is said to be stable.If even the smallest deviations result in forces or torques that tend to increase the displacement, the equilibrium is said to be unstable.Learn more about stability here:
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Answer:c
Explanation:got it wrong bc the other person didn’t know bc their small minded
A cliff diver from the top of a 100 (m) cliff. He begins his dive by jumping up with a velocity of 5 (m/s) a. How
long does it take for him to hit the water below? b. What is his velocity right before he hits the water?
Answer:
A.) 4.81 seconds
B.) 44.6 m/s
Explanation:
He begins his dive by jumping up with a velocity of 5 (m/s).
Let us first calculate the maximum height reached by using third equation of motion
V^2 = U^2 - 2gH
At maximum height, V = 0
0 = 5^5 - 2 × 9.8H
19.6H = 25
H = 25 /19.6
H = 1.28 m
The time taken for the diver to reach the water from the maximum height can be calculated by using second equation of motion.
Where height h = 1.28 + 100 = 101.28 m
h = Ut + 1/2gt^2
As the diver drop from maximum height, U = 0
101.28 = 1/2 × 9.8 × t^2
4.9t^2 = 101.28
t^2 = 101.28/4.9
t^2 = 20.669
t = sqrt ( 20.669)
t = 4.55s
As the diver jumped up, the time taken to reach the maximum height will be
Time = 1.28 / 5 = 0.256
The time taken for him to hit the water below will be 0.256 + 4.55 = 4.81 seconds
B.) Velocity right before he hits the water will be
V^2 = U^2 + 2gH
But U = 0
V^2 = 2 × 9.8 × 101.28
V^2 = 1985.09
V = 44.6 m/s
A.) The time taken should be 4.81 seconds
B.) The velocity should be 44.6 m/s
Calculation of the time taken and velocity:Here we used third equation of motion
V^2 = U^2 - 2gH
At maximum height, V = 0
Now
0 = 5^5 - 2 × 9.8H
19.6H = 25
H = 25 /19.6
H = 1.28 m
Here the second equation of motion.
Here height h = 1.28 + 100 = 101.28 m
So,
h = Ut + 1/2gt^2
Since the diver drop from maximum height, U = 0
So,
101.28 = 1/2 × 9.8 × t^2
4.9t^2 = 101.28
t^2 = 101.28/4.9
t^2 = 20.669
t = sqrt ( 20.669)
t = 4.55s
Now
Time = 1.28 / 5 = 0.256
Finally the time should be
= 0.256 + 4.55
= 4.81 seconds
B.)
We know that
V^2 = U^2 + 2gH
But U = 0
So,
V^2 = 2 × 9.8 × 101.28
V^2 = 1985.09
V = 44.6 m/s
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you throw a basketball straight up into the air with a speed of 24.5m/s. how long does it take to reach its highest point
Answer:
2.5 seconds.
Explanation:
Time equals speed divided by acceleration. gravitational acceleration is equal to 9.8 [tex]\frac{m}{s^{2} }[/tex]. You know that the speed is equal to 24.5 m/s, so plug those values into the equation.
24.5 / 9.8 = 2.5 seconds.
Hope this helps!
Answer: 2.5 s
Time=speed/acceleration
Gravitational Acceleration=9.8 m/s^2
Speed=24.5 m/s
Time=24.5/9.8=2.5 s
hopes this helps UwU
and if like my answer can you please mark me as brainliest please
thank you
and sorry it took so long i was trying to catch up with my missing assignments
What is the phase of water when its temperature is 150 °C?
Which pair of quantities represent scalar quantities, and how are they different from vector quantities?
A. energy and velocity
B. displacement and velocity
C. displacement and time
D. distance and time
D.
They don't have directions.
The quantities with only magnitude and no direction are called scalar quantities. Therefore, option D is the correct answer.
Scalar quantities have only magnitude but vector quantities have both magnitude and direction. Some examples of scalar quantities are,
• Mass
• Temperature
• Speed
• Density
Thus, we conclude that the quantities with only magnitude and no direction are scalar quantities. Hence option D is the correct pair.
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what property do all of the group 18 elements have that makes them stand out from other elements on the periodic table
Answer:
The noble gases are a group of chemical elements that make up Group 18 on the periodic table. These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.
What are the 4 categories that makes the human body
Answer:
epithelial, muscle, nervous, and connective tissues.
Explanation:
Study habits include
a.
How you prepare for assignments
c.
What questions you ask your teacher
b.
How you take tests
d.
All of these
Please select the best answer from the choices provided
A
B
C
D
Answer:
D
Explanation:
Study habits include, how you prepare for assignments, what questions you ask your teacher, and How you take tests, all of these come under study habits, therefore the correct answer is option D.
What is science?The deliberate evidenced based quest and application of information and comprehension of the natural implications for society is what is known as research.
Science is a methodology of discovering more about the world.
People may contribute to the development of new knowledge through science and utilize it to promote their objectives.
A student's study habits include factors like how they approach tasks, questions they ask their professors, and how they prepare for the exam
Thus, the correct answer is option D.
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using the following choice identify the choice that the best describe homeostasis.
1-maintaining internal balance
2-energy
3-unequal distribution
4-diffusion
Answer:
maintaining internal balance
Explanation:
this question is in biology not physics
In many locations, old abandoned stone quarries have become filled with water once excavating has been completed. While standing on a 10.0 m high quarry wall, Clarence tosses a piece of granite into the water below. If Clarence throws the rock horizontally with a velocity of 3.0 m/s how far out from the edge of the cliff will it hit the water?
Answer:
Explanation:
Let us calculate the time of flight first using the formula;
Velocity = Displacement/Time
Time = Displacement/speed
Time = 10.0/3
Time = 3.33secs
Next is to calculate how far out from the edge of the cliff it will hit the water. To get that, we will use the equation of motion;
S= ut+1/2gt²
u is the initial velocity = 0m/s
g is the acceleration due to gravity = 9.81m/s
S = 0 + 1/2(9.81)(3.33)²
S = 4.905*3.33*3.33
S = 54.39m
Hence it will hit the water at 54.39m from the edge of the cliff
Answer:
It will hit the water at [tex]4.28m[/tex] off the cliffExplanation:
Applying kinematic relations along vertical direction
[tex]y = V_0t + \frac{1}{2}a_yt^2[/tex]
where,
[tex]a_y = g[/tex]
therefore,
[tex]y = 0 + \frac{1}{2}gt^2[/tex]
The time taken
[tex]t = \sqrt{\frac{2y}{g}}\\\\t = \sqrt{\frac{2*10}{9.8}}\\\\t = 1.428s[/tex]
The horizontal distance
[tex]x = V_yt\\\\x = 3*1.428\\\\x = 4.28m\\\\[/tex]
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A hot air balloon is traveling vertically upward at a constant speed of 7.0 m/s.
When it is 21 m above the ground, a package is released from the balloon. For
how long is it in the air?
Answer:
The time spent in air by the package is 1.5 s
Explanation:
Given;
speed of the balloon, v = 7.0 m/s
distance traveled by the balloon, d = 21 m
The time spent by the object in the air is give by;
d = vt + ¹/₂gt²
21 = 7t + ¹/₂(9.8)(t²)
21 = 7t + 4.9t²
4.9t² + 7t -21 = 0
solve this quadratic expression, and the value of t will be
t = 1.5 s
Therefore, the time spent in air by the package is 1.5 s
Si la aceleración de gravedad en la superficie del planeta Mercurio es de 3,7 m/s2, entonces ¿cuál sería el peso de una persona de 60 kg de masa que se encuentre sobre su superficie?
Answer:
W = 222 N.
Explanation:
The qiestion says" If the acceleration of gravity on the surface of the planet Mercury is 3.7 m / s2, then what would be the weight of a person with mass 60 kg on its surface? "
Mass of the person, m = 60 kg
The acceleration due to gravity on the surface of gravity is 3.7 m/s²
We need to find the weight of a person on the surface of Mercury.
Weight of an object is given by :
W = mg
So,
W = 60 kg × 3.7 m/s²
W = 222 N
Hence, the person will weigh 2222 N on the surface of Moon.
If R1 is 2 ohms and R2 is 3 ohms and R3 is 5 ohms...what is total resistance?
R1
R2
R3
W
M
I
I
o a
1 ohms
Ob
10 ohms
Ос
8 ohms
HEEELLLLLPPPPPPPP
Answer:
10 ohm
Explanation:
Since the resistors are arranged in series, their total resistance is their sum.
Hence, Total R = 2+3+5 = 10 ohm
Does the earth emit visible light or heat
Answer:
Heat
Explanation:
2.(02.07 MC)
The table below shows data of sprints of animals that traveled 75 meters. At each distance marker, the animals' times were recorded. Which animal moves with non-accelerated motion? (2 points)
Time at Distance Markers
25 meters 50 meters 75 meters
Animal
Animal 1 3 seconds
4.5 seconds 5 seconds
5.25 seconds
Animal 2 4.5 seconds 5 seconds
Animal 3 3.5 seconds 7 seconds
10.5 seconds
Animal 4 5 seconds
10 seconds
13 seconds
O Animal 1
O Animal 2
O Animal 3
O Animal 4
Is the answer C or B
Answer:
c
Explanation:
though c is wider it has more water.
The answer is *C* Because The C Jar is Wider than others so it holds more water
Which property of an object is the result of gravity?
O A. Weight
B. Mass
O C. Velocity
OD. Volume
Answer:
it's (A) weight I think
Answer:
A. Weight
Explanation: Weight is defined as the amount of force placed on an object from gravity which means it is directly reliant on the force of gravity while the other choices are not. Neither Mass, volume, or velocity is impacted by gravity as much as weight, velocity is the direction of speed, mass is the resistance that a body of matter offers to a change in its speed or position upon the application of a force, and volume is the amount of space an object takes. As you can see none of these componant have gravity as a determining factor other than weight since weight is determined by the gravity which is why the weight of an object can vary if your on earth or on the moon since the gravity is different.
1. A science class is studying seeds. They plan to measure the length, height, and mass of different types of seeds. Which of these items should the class use to record their measurements as the class takes the measurements? *
A.camera
B.drawing
C.graph
D.data table
What is the wavelength of a wave with a speed of 20 m/s and a frequency of 20 Hz?
Wavelength =(speed)/(frequency)
Wavelength =(20 m/s) / (20/s)
Wavelength = 1 meter
i need help i don’t understand
Answer:
precise
Explanation:
im pretty sure
an athlete runs around a 400m race track four times it takes him 400s to complete his run
Answer: its taking him 100s to run around the track once
Explanation:
the unit of energy is derived unit. ( give reasons)
Answer:
Because it is made by two different unit force (F) and displacement(s)
name the three States of matter
Answer:
[tex] \fbox{ \sf { \: Solid \: , \: Liquid \: and \:Gas}}[/tex]
Explanation:
[tex] \star[/tex] Let's learn about matter.
We see different kinds of things around us. Some of these are wood , book , salt , beaker , sugar , water , milk , oil, rubber and water vapour. All these things occupy space and have mass as they are matter. Anything that occupies space and has weight is called matter.
[tex] \star[/tex] States of Matter
Solid , liquid and gas are the three states of matter.
[tex] \hookrightarrow{ \text{ \underline{ Solid}}}[/tex]
Different things have different sizes and shapes but a particular thing has a fixed shape and size. The things which have definite size and definite shape are solids. Stone , word , ice , glass etc are some examples of solid.
[tex] \hookrightarrow{ \text{ \underline{ Liquid}}}[/tex]
The things having a definite volume but no definite shape of their own are called liquids. Water ,milk , petroleum , oil etc are as common examples of liquid.
[tex] \hookrightarrow{ \underline{ \text{Gas}}}[/tex]
The things which have neither a definite volume not a definite shape of their own are called gases. The bases take the shape and the size of the vessels in which they are enclosed. Air , smoke , water vapours , hydrogen gas are some examples of gases.
[tex] \sf{Hope \: I \: helped !}[/tex]
[tex] \sf{Best \: regards !!}[/tex]
~[tex] \text{TheAnimeGirl}[/tex]
A moving object is in equilibrium. Which best describes the motion of the object if no forces change?
O It will change directions.
O It will slow down and stop.
O It will maintain its state of motion.
O It will speed up and then slow down.
Answer:
It will maintain its state of motion
Explanation:
The object would maintain its state of motion.
What does it mean when an object is in equilibrium?If the size and direction of the forces acting on an object are exactly balanced, then there is no net force acting on the object and the object is said to be in equilibrium.
What does equilibrium mean in physics?Equilibrium, in physics, the condition of a system when neither its state of motion nor its internal energy state tends to change with time.
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differences between a pair of scissors and nailcutter
Answer:
Different classes of levers
Explanation:
The main difference between a pair of scissors and nailcutters is that they are different classes of levers. Scissors are made from two class 1 levers, meaning that the effort is exerted at one end and the load at the other with the fulcrum in the middle. This is because we press one end together (the handles) so we are applying the effort, and the other side closes from the fulcrum in the middle.
Nailcutters on the other hand, consist of two class 2 levers. This means that the fulcrum is on the opposite end to the effort with the load in the middle. This is because we press down on one side and the two parts move closer together.
Hope this helped!
a kid is running at an average speed of 6.8mi/h. how long does it take this kid to run a mile? convert to meters
Answer:
t = 8.82 minutes
Explanation:
The average speed of an object is given bu the total distance covered divided by total time taken.
The average speed of a kid is 6.8 mi/h
Let t is the time taken by this kid to run a mile, d = 1 mile
[tex]v=\dfrac{d}{t}\\\\t=\dfrac{d}{v}\\\\t=\dfrac{1\ \text{miles}}{6.8\ \text{mi/h}}\\\\t=0.147\ \text{hour}[/tex]
or
t = 8.82 minutes
So, it will take 8.82 minutes to run a mile.
There are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. What do you think would be the reason?
Explanation:
The time period of a simple pendulum is given by :
[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]
L is length of the pendulum and g is acceleration due to gravity
It is very much clear that the time period depends on the length of the pendulum.
In this problem, there are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. The only reason for 25 pendulums having different time periods is that they have different lengths than the other 75 pendulums.
Free fall kinematics
Percy threw a penny straight down off the Empire State building. The building is 354 m tall. If he threw the penny down such that it left his hand at 35 m/s, what is the acceleration of the penny? What will the velocity of the coin that Percy threw be when it hits the pavement?
Answer:
90.4 m/s
Explanation:
Take down to be positive. For objects in free fall, the acceleration is 9.8 m/s².
Given:
Δy = 354 m
v₀ = 35 m/s
a = 9.8 m/s²
Find:
v² = v₀² + 2aΔy
v² = (35 m/s)² + 2 (9.8 m/s²) (354 m)
v = 90.4 m/s