Answer:
The answer is B. I hope this helps!
Explanation:
B is the only answer with a scientific explanation. You cannot change lead into gold, quartz can't protect you from illness, and the positions of stars and planets have no effect on a person.
A bullet is shot horizontally from the edge of a tall cliff. At the instant the bullet is shot, a rock is dropped from the same height. Neglecting air resistance, which one will hit the ground first
Answer:
The bullet and the rock will hit the ground at exactly the same time
Explanation:
Due to the gravitational forces, defined by Newton's law of gravitation, the acceleration of objects towards the center of the Earth is constant and equal to the acceleration due to gravity, g ≈ 9.8 m/s².
Therefore, given that the initial vertical velocity, u, of the rock and the bullet are both equal to zero, from the following equation of motion, we have;
s = u×t + 1/2·g·t²
t = Time
s = The height from which the bullet is fired and the rock is dropped
s = 0×t + 1/2 × 9.8 × t²
s = 1/2 × 9.8 × t²
t = √(2 × s/9.8)
Therefore, the time to hit the ground is only dependent on the height from which the bullet and the rock were allowed to fall freely.
What do you ocean waves and sound waves have in common?
Answer:
They are both mechanical waves
a runner covers the last straight stretch of the race in 4 s. durning that time, he speeds up from 5 m/s to 9m/s what is the runners acceleration in this part of the race?
Answer:
The runner's acceleration was [tex]1\ m/s^2[/tex]
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at[/tex]
Solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
The runner speeds up from vo=5 m/s to vf=9 m/s in t=4 seconds, thus:
[tex]\displaystyle a=\frac{9-5}{4}[/tex]
[tex]\displaystyle a=\frac{4}{4}=1[/tex]
The runner's acceleration was [tex]1\ m/s^2[/tex]
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?
Which of the following would have the MOST thermal energy?( A 33 gram ice cube. O A 100 gram cup of coffee. O A 50 gram spoon sitting on the counter O A 500 gram pot of boiling water.
I need some help, anything will help, I just need a better understanding of this
Answer:
12 meters
Explanation:
to find this we look at the 8 on the horizontal line this is 8 seconds, you then look upwards to see the height at that point in time
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.
which of newtons laws explains why when you bump into something you fall backwards
Answer:
Newtons third law
Explanation:
every action has an equal but opposite reaction
it exerts the force back on you
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A person running has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?
144 kg
144 kg
360 kg
360 kg
3,600 kg
3,600 kg
30 kg
Explanation:
Momentum is mass times velocity.
p = mv
720 kg m/s = m (5 m/s)
m = 144 kg
A particle or object with more electric charge produces a stronger and larger electric field.
true or false
Question 9 (28 points)
The earth's gravity keeps the moon in orbit by pulling on it. The moon's gravity
A. can only pull on smaller objects such as asteroids but has no effect on the earth
B. pulls back on the earth
C. pushes the moon away from the earth
D. doesn't affect anything
The moon's gravity pulls back on the earth. (B)
The two pulls are EQUAL.
Gravity always produces a pair (2) of equal forces in opposite directions. For example, your weight on the Earth is equal to the Earth's weight on you !
4) Why is it important to do a warm up with stretching and also a cool down with
stretching when exercising?
Answer:
Warming up may help reduce muscle soreness and lessen your risk of injury. Cooling down after your workout allows for a gradual recovery of preexercise heart rate and blood pressure.
Explanation:
the current through a wire is 0.5 a when the potential difference across is 4.0.v. calculate the resistance of the wire
v = ir
where v is voltage and i is current
r = v/i
r = 4/0.5
r = 8 ohms
The current through a wire is 0.5 a when the potential difference across is 4.0.v, the resistance of the wire is 8.0 ohms.
Ohm's law, which states that the resistance (R) of a wire is equal to the ratio of the potential difference (V) across the wire to the current (I) flowing through it, can be used to calculate the resistance of a wire.
It has the following mathematical expression:
R = V ÷ I
Here, it is given that:
Potential difference (V) = 4.0 V
Current (I) = 0.5 A
Now we can substitute the values into the formula:
R = 4.0 V ÷ 0.5 A
Calculating the division:
R = 8.0 ohms
Therefore, the resistance of the wire is 8.0 ohms.
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(18 points) Which list places different units of matter in the correct sequence from
smallest to largest?
A. Protons, bricks, atoms, rock particles, buildings
B. Protons, atoms, bricks, rock particles, buildings
C. Protons, rock particles, atoms, bricks, buildings
D. Protons, atoms, rock particles, bricks, buildings
The units of matter in the correct sequence from smallest to largest will be Protons, atoms, rock particles, bricks, buildings. Option D is correct.
What is an atom?Atom is the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
The atom consists of matter that may be split without releasing electrical charges.
In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle. Many particle combines to form bricks used in the construction of building.
The units of matter in the correct sequence from smallest to largest will be Protons, atoms, rock particles, bricks, buildings.
Hence, option D is correct.
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Three resistors are placed in series. They have the following resistances: R1 = 20 ohms, R2 = 20 ohms, R3 = 10 ohms. What
current would be moved through this circuit by a 5-V power supply?
Answer:
0.10 A
Explanation:
To strike or hit something with great force
Answer:
To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.
Answer:
To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.
Explanation:
Complete the statements by writing “image” or “no image”.
Becquerel expected to find (an)
when he developed the photographic plate that had Sun-exposed minerals on top of it.
Becquerel expect to find (an)
when he developed the photographic plate that had been in the closed drawer.
Answer:
1 Imadge 2 no
Explanation:
Answer: 1: image, 2: no image
Explanation:
2. Use Tables Both an atom of carbon-12 and
an atom of boron-12 have the same mass
number. Use a periodic table to help you
describe the differences in the two atoms.
Answer:\
the atomic number of boron (B) is 5.
Atomic number is the number of protons, which is characteristic of a chemical element. Atomic number increases from left to right in Periodic table.
Boron is an element with atomic number 5, which means it has 5 protons and 5 electrons, boron atom has neutral charge.
Electron configuration of boron: ₅B: 1s² 2s² 2p¹, it has three valence electrons in 2s and 2p orbitals.
Explanation:
there you go have a good day
Se dispara una bala con una velocidad de v = 300[m/s] contra un cascarón esférico de papel que gira con MCU respecto a un eje vertical. Sabiendo que el radio del cascarón es de 10[cm]. Calcular la rapidez angular mínima que deberá girar el cascarón para que el proyectil haga únicamente un agujero. La dirección del movimiento de la bala pasa por el centro de la esfera.
Answer:
w = 4.712 10⁻³ rad / s
Explanation:
For this exercise, the time it takes for the bullet to travel the distance of 2R must be equal to the time that the hole must travel half a circle.
Let's start by calculating the time it takes for the bullet, which is going at constant speed.
v = x / t
t = x / v
t = 2R / v
t = 2 0.10 / 300
t = 6.666 10⁻⁴ s
As they ask that a single hole is formed in this time, it must be rotated half a circle, that is, θ =π rad, for which we use the angular scientific relations, where the shell has constant angular velocity
w = θ / t
w = π / 6,666 10⁻⁴
w = 4.712 10⁻³ rad / s
Thelma and Louise ending filmed at: Dead Horse Point , Moab Utah
Cliff Height: 609.6 m ( 2000 feet)
Vehicle Velocity at cliff edge: 40.3 meters/second (90 miles per hour)
Questions to answer: The Colorado River is at the bottom of the cliff approximately 536.5 meters (1,760 feet) from cliff base. The river averages 300 feet across and is forty feet deep.
A. Does the car land in the river?
B. How much closer to the cliff base would the river have to be, to allow the car to land 50 feet from the edge of the river?
Answer:
A. The car does not land in the river
B. 399.27 meters
Explanation:
The Cliff Height, s: 609.6 m
The velocity at the edge of the cliff, vₓ = 40.3 meters/second (90 miles per hour)
The location of the Colorado River = 536.5 meters (1,760 feet) from the cliff base
The width of the river across = 300 feet average
The depth of the river = 40 feet
Assumption;
The direction of the vehicle = Horizontal
Vertical velocity of the vehicle = 0 m/s
The time, t, it takes the car to reach the level of the bottom of the cliff is given as follows;
s = [tex]u_y[/tex]·t + 1/2·g·t²
Where;
[tex]u_y[/tex] = The initial vertical velocity of the vehicle = 0
g = The acceleration due to gravity = 9.81 m/s²
Therefore, we have;
609.6 = 0×t + 1/2 × 9.81 × t²
609.6 = 1/2 × 9.81 × t²
t = √(2 × 609.6/9.81) ≈ 11.148 seconds
The horizontal distance, x, travelled by the car in the above calculated, 11.148 seconds, time is x = vₓ × t = 40.3 × 11.148 = 449.27 meters
Therefore, the horizontal distance from the cliff travelled by vehicle on landing from the base of the cliff = 449.27 meters
Given the river is located approximately 536.5 meters from cliff's base, the car does not land in the river
B. In order for the car to land 50 ft. from the edge of the river, the river has to be 449.27 - 50 ≈ 399.27 meters from the base of the cliff.
Mixtures that appear to be homogeneous but actually contain particles that are intermediate in size between solutions and suspensions are
1. colloids
2. immiscible
3. suspensions
Answer:
the answer is colloids.
Read the following scenario and decide if it is a hypothesis, theory or law.
John is an amateur astronomer who is in his second semester of high school physics.
Accordingly, he knows that objects in motion remain in motion and move at constant
velocity in a straight line until some force acts on them. John observes that all of the
planets in this solar system orbit the sun in approximately circular orbits. In addition,
the farther a planet is from the sun, the longer it takes for that planet to complete one
orbit. John discusses his observations with like-minded friends, who also observe and
verify what John has seen. Based on these consistent observations from many different
people, John concludes that there is gravity in outer space. Is this conclusion a
hypothesis, theory or law?
Hypothesis
Theory
Law
Answer:
this questions is capable of being answered by submitting law
Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink?
Explanation:
Substances with their density less than that of water which is 1 g/cm³ will float on it whiles those greater than that of water will sink into the water
From the question the density of the object is greater than that of water so the object will sink into the water
Hope this helps you
Answer:
The rock will sink because it is more dense than water.
Explanation:
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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i know you might be like wha? she here is my question. what make a atom? then what makes up that? and on and on. is there a universe of everything?! is science just a part of what is really out there?! are we just a tiny little thing in the whole universe?! well that is it.
Answer:
Yes
Explanation:
An atom is made up of itself. Yes this is crazy but true. So far we have found the universe is everlasting, and the universe is part of itself meaning there nothing outside, except heaven and hell
John and Susan find a penny, and Susan says, "I bet you can't tell me what is on the
penny". John thinks about it, and realizes he can't describe the penny. It appears that
John can't describe a penny because he never learned what one looked like in the
first place. John's inability to describe the penny is an example of
1) simply forgetting.
2) a failure to encode.
3) retroactive interference.
4) proactive interference.
Answer:
hey
Explanation:
hey
John and Susan find a penny, and Susan says, "I bet you can't tell me what is on the penny". John's inability to describe the penny is an example of a failure to encode.
The ability to encode a piece of information is to be able to translate or explain the body of information at a later date or time. When John thinks about what is on the penny, he couldn't describe it because he never learned how to encode the information on the piece of the penny in the first place.
Retroactive interference is a process whereby fresh memories interfere with the recovery of old memories. This sort of interference has a retrograde impact rendering it more challenging to recall previously learned information.
On the other hand, proactive interference is a process whereby old memories interfere with the recovery of fresh new memories.
Therefore, we can conclude that since John has never learned what a penny looked like before, he doesn't have previous information about it. As such, the only correct option is (2)
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What is part of the fourth stage in the process of technological design?
O rebuilding and retesting a product
O analyzing the results of a prototype
establishing criteria for a successful product
identifying and defining a problem or need
Answer:
It is A.
Explanation:
Got it right on Edge 2022.
Rebuilding and retesting a product is part of the fourth stage in the process of technological design, therefore the correct answer is option A.
What are the stages of technological design?There are mainly five stages of the technological design
Identifying the issue that needs to be solved is the first step in every problem-solving process.
The second stage is to imagine; during this phase, a designer would generate several concepts and conduct research on potential creations. They must pick a handful of their greatest concepts and then narrow it down to the best.
The chosen product from the imaging stage is planned in the third stage. This process involves designing and drawing the product so that it may be turned into a model or prototype while taking into account the constraints they have to deal with.
Testing, evaluating, and modifying the product are the fourth stage. The designer can determine what they appreciate about their product and what they could change by making a model or prototype of it. Through product testing, this is discovered. If adjustments are required, the designer will repeat the entire procedure until they are satisfied with the final result.
The sharing of your solution is the fifth step. To gather comments, discuss your ideas with others, and enhance your product, you showcase your solution. You might show your answer to a bigger audience in later stages after you've gone through the design process a few times. This is comparable to how World of Inquiry students modifies their homework numerous times before presenting them during the expedition.
Thus, Rebuilding and retesting a product is part of the fourth stage in the process of technological design, therefore the correct answer is option A.
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What are 2 examples of convection, 2 examples of conduction and 2 examples of radiation plsss answer
Answer:
this could probably be useful to you
Determine the total displacement of a dog that runs 15 m north, 6 m south, then 8 m north.
Answer:
the displacement Is 17m north
Explanation:
15-6=9
9+8=17
The total displacement of a dog that runs 15 meters north, 6 meters south, then 8 meters north would be 17 meters because displacement is measured by the shortest distance between the initial and final position of the moving object.
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard.
Displacement describes this shift in location.
Displacement is a vector quantity.
Since the displacement is determined by the smallest distance between the moving object's original and final positions, a dog traveling 15 meters north, 6 meters south, then 8 meters north would move a total of 17 meters.
Thus, the total displacement of the dog comes out to be 17 meters.
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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).