Answer: How much gravitational potential energy does the ball have at this point? At h = 20.4 m the gravitational potential energy of the ball reaches maximum.
How much work did I do lifting up the ball? As you are lifting the object you are doing work on the object. The work W done on an object by a constant force is defined as W = F·d. It is equal to the magnitude of the force, multiplied by the distance the object moves in the direction of the force.
A music fan at a swimming pool is listening to a radio on a diving platform. The radio is playing a constant- frequency tone when this fellow, clutching his radio, jumps off. Describe the Doppler Effect heard by (a) a person left behind on the platform and (b) a person down below floating on a rubber raft. In each case, specify (1) whether the frequency is greater or smaller than the frequency produced by the radio, (2) whether the observed frequency is constant, and (3) how the observed frequency changes during the fall, if it does change. Give your reasoning.
Answer:
The Doppler Effect is given by the following relation;
[tex]f' = \left (\dfrac{v + v_0}{v - v_s} \right) \times f[/tex]
Where;
f' = The frequency the observer hears
f = Actual frequency of the wave
v = The velocity of the sound wave
[tex]v_o[/tex] = The velocity of the observer
[tex]v_s[/tex] = The velocity of the source
Where the observer is stationary, we have;
(i) When the source is moving in the direction of the observer
[tex]f' = \left (\dfrac{v }{v - v_s} \right) \times f[/tex]
(ii) When the source is receding from the observer, we have;
[tex]f' = \left (\dfrac{v }{v + v_s} \right) \times f[/tex]
Therefore;
(a) A person left behind on the platform
For a person left behind on the platform, we have that the radio source is receding, therefore, we have;
[tex]f' = \left (\dfrac{v }{v + v_s} \right) \times f[/tex]
(1) Given that (v + [tex]v_s[/tex]) > v, therefore, v < (v + [tex]v_s[/tex]), f' < f, the frequency heard by the person left on the platform, f', is smaller (lower) than the frequency produced by the radio
(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity
(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively smaller
(b) A person down below floating on a rubber raft
For the the person down below on the rubber raft, the radio source is advancing
Therefore, the radio source is moving towards the person at rest down on the rubber raft, therefore, we have;
[tex]f' = \left (\dfrac{v }{v - v_s} \right) \times f[/tex]
(1) Given that (v - [tex]v_s[/tex]) < v, therefore, f' > f, the frequency heard by the person down below floating on the rubber raft, f', is greater (higher) than the frequency produced by the radio
(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity
(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively greater (higher)
Explanation:
Help plz for 25 points !! I only have an hour left !
Can you please answer my question correctly ASAP
Answer:
1) C, 2) C, 3) B, 4) D, 5) A/B, 6) D, 7) D, 8) A, 9) B, 10) A
Explanation:
1) Seconds, minutes and days are time units. (Correct answer: C)
2) The displacement is shortest distance between the point of origin and the point of destination. (Correct answer: C)
3) The velocity is the rate of change of position in time. (Correct answer: B)
4) Graphs are a very useful ressource to infer characteristics inherent to a studied physical variable. (Correct answer: D)
5) There are two possible answers, since both milimeters and meters are units for distance. (Correct answers: A/B)
6) The distance is the arc length of the entire path that object travelled. (Answer: D)
7) Traditionally, in a position vs. time graph we plot time in the x-axis. (Answer: D)
8) In this case, we use a distance-time graph, where travelled distance is the dependent variable and time is the independent variable. (Answer: A)
9) The point of origin is the initial position of the object. (Answer: B)
10) The point of destination is the final position of the object. (Answer: A)
Which of the following is not true about a scientific name?
a. they should be typed in italics
b. they are derived from Greek and Latin words
c. they contain a genus and species name
d. they can vary from location to location
State whether the following are true or false.
1. Sun dial and sand clock were used in ancient time. ______
2. Cubit, handspan and foot span are standard units of measurement. ______
3. Pendulum clock repeats its motion at equal intervals of time. ______
4. In digital clocks, mechanical vibrations are converted into digital electronic signals. ______
5. Sundials can also be used on rainy days.
Answer:
Explanation:
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The Sun creates energy through a series of steps known as:
The Sun creates energy through a series of steps known as nuclear fusion.
What is nuclear fusion?Nuclear fusion is the process by which atomic nuclei combine to form heavier nuclei, releasing a tremendous amount of energy in the process. In the Sun, this process occurs in the core, where the temperature and pressure are high enough to overcome the electrostatic repulsion between positively charged atomic nuclei. Hydrogen atoms are fused together to form helium atoms, releasing energy in the form of light and heat.
The process of nuclear fusion in the Sun can be broken down into several steps.
The first step involves the collision of two hydrogen atoms to form a deuterium atom, releasing a positron and a neutrino in the process. The deuterium atom can then combine with another hydrogen atom to form helium-3, releasing a gamma ray. Finally, two helium-3 atoms can combine to form helium-4, releasing two protons and releasing even more energy in the process.
Therefore, the process of nuclear fusion in the Sun is a complex series of steps that releases a tremendous amount of energy and is responsible for the light and heat that we receive on Earth.
To learn about Kinetic energy click:
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An 80 kg runner has 3,000 J of kinetic energy. What is her velocity in m/s?
Answer: 8.6m/s
Explanation:From KE=1/2mv^2
In order to make v the subject of the formula we divide both sides by 1/2m. Thus V^2 will be left alone on the RHS. But we are looking for v and not v^2. Thus we find the square root of KE1/2m
Meaning V= sqrt[3000÷1/2 of 80]
=sqrt[3000÷40]
=sqrt(75)
=8.6m/s
Danielle took an iron nail and wrapped thin copper wire around it, then connected the ends of the copper wire to a battery. Which force or forces can Danielle's device produce?
Answer:
yes her device can produce
Explanation:
An electromagnetic force is produced by this setup.
The question suggests the construction of a solenoid with an iron core.I have attached an image. A solenoid has an iron core wrapped around by insulating wires. When the insulating wires are connected to a battery or a voltage source, current flows in the wire and travels through the wrapped region around the iron core. Now, this current produces a magnetic field inside the solenoid, directed along the axis of the solenoid. When the iron core comes under the influence of this magnetic field, it magnetizes and acts as a strong magnet and can produce magnetic force. The force generated through this process is called electromagnetic force.
When the battery is removed, the solenoid returns to its original state, which is it doesn't act as a magnet anymore. By the way, iron retains some magnetization.
Learn more about electromagnetic force:
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At which angle do wires have to be to experience full force? What happens at other angles?
Answer:
The angle wires have to be placed to experience full force is such that the angle between the direction of current flow and the direction of the magnetic field is 90°
Explanation:
The direction of the force acting on a conductor through which a charge flows is given by Flemings Left Hand Rule which states that the direction of the force acting on a conductor carrying a current of charge is perpendicular to both the direction in which the current is flowing and the direction of the magnetic field
Therefore, wires carrying flowing charges has to be placed such that the direction of charge (current) flow is perpendicular (at 90°) to an existing magnetic field to experience (maximum) full force
imagine no girls awnser this question ://
Answer:
im confused
Explanation:
What heat transfer are uv rays from the sun. Radiation, conduction, or convection
Answer:
The ans is Radiation
Mark as brainliest !!
A scientist is designing a device that will mimic Earth's atmosphere by
blocking high-energy waves from the Sun. Pick three high-energy waves
that the device should be able to block?
Answer:
1. Ultraviolet light (UV)
2. X-rays
3. Gamma-rays
Explanation:
Though there are different types of energy or electromagnetic waves with varying wavelengths, including the likes of Gamma X-rays, ultraviolet light, visible light, infrared radiation, and microwave radiation.
What is more certain is that the atmosphere blocked the high-energy waves from getting to the earth surface or biosphere such as Ultraviolet light (UV), X-rays and Gamma-rays
Which of the following methods transmits a drug directly into the bloodstream?
Answer:
I think Intravenous transmits a drug directly into the bloodstream.
Hope this help! :)
Some people say it is rare to get HIV from a blood transfusion in the United States. True or false? Why?
Answer:
False
Explanation:
Because there is a 90% chance of contracting HIV from a blood transfusion
What will be the change of velocity of a 50kg object if a force of 2,000N
is applied to it for 0.010 seconds?
Answer:
0.4m/s
Explanation:
[tex]F = ma[/tex] where F= force, m= mass, and a=acceleration
we also know that,
a = Δv / t where Δv = change in velocity and t = time
thus F = m ( Δv / t)
[tex]2000=50(\frac{v}{0.01})[/tex]
[tex]\frac{2000}{5000} = v[/tex]
0.4m/s = Δv
The distance between the two nearest points on a wave where the particles are in phase is 2 m. What is the wavelength of the wave?
A. 1/2 m
B. 1 m
C. 2 m
D. 2 seconds
E. none of these
Answer:
Suppose that the wave equation is:
f(x) = A*cos(k*x)
The wave is in phase for two points x₁ and x₂ if:
f(x₁) = f(x₂)
And if these points are consecutive (for example, two consecutive peaks) then the wavelength of the wave is:
wavelength = x₂ - x₁
In this case, we know that the wave is in phase for two points that are 2 m apart.
Then we can use the points:
x₁ and x₂ such that:
x₂ = x₁ + 2m
We also know that these are the nearest points such that this happens, then we can assume that the points are consecutive.
Then the wavelength will be:
wavelength = x₂ - x₁ = (x₁ + 2m) - (x₁) = 2m
Then the wavelength is 2m.
The correct option is C.
a balloon rubbed against denim gains a charge of -8.0 x 10^-6 c. What is the electric force between the balloon and the denim, which now has a charge of +8.0 × 10^-6 C, when the two are separated by a distance of 0.05 m?
Answer:
230.4 N
Explanation:
Applying,
F = kqq'/r²..................... Equation 1
Where F = Electric force, k = Coulomb's constant, q = charge in the ballon, q' = charge in the denium, r = distance between the charges.
From the question,
Given: q = -8.0×10⁻⁶ C, q' = +8.0×10⁻⁶ C, r = 0.05 m
Constant: k = 9×10⁹ Nm²/C²
Substitute these values into equation 1
F = (9×10⁹×8.0×10⁻⁶×8.0×10⁻⁶ )/0.05²
F = (576×10⁻³)/0.0025
F = 230.4 N.
answer right away!!—A plucked guitar string emits a dominant
frequency of 320 Hz. What is the
frequency of the 3rd harmonic?
Answer:
20000000000000hz only for this
what forces are being used when walking a dog and how ?
You and your younger sister (who weighs half as much you do) are at a skating rink. You are both wearing roller skates and are facing each other. What will happen to your and your sister's motion if you push against each other?
Question 1 options:
You move forward and your sister moves backward at a faster rate.
You both move forward, but you accelerate at a greater rate.
You move backward and your sister moves forward at a faster rate.
You both move backward but your sister accelerates at a greater rate.
Question 2 (1 point)
You are standing, completely still, on a completely flat floor. Why do you stay as you are instead of flying into the air?
Question 2 options:
There are no forces acting on you or the floor.
Forces are only acting on the floor.
All of the forces acting on you are balanced.
You are exerting an unbalanced force on the floor.
Question 3 (1 point)
A baseball is thrown at 90 mph from east to west over a distance of 60 ft. What is true of the ball's motion?
Question 3 options:
Its speed is 90 mph to the west.
Its acceleration is 30 mph.
Its velocity is 90 mph to the west.
Its acceleration is 150 mph.
Question 4 (1 point)
A box is pushed 7 m to the left in 3 s. What is the block's average speed to the nearest tenth?
Question 4 options:
2.33 m/s
0.43 m/s
2.3 m/s
0.4 m/s
Question 5 (1 point)
graph
On a graph of distance vs. time, what is true of the motion of the object during its first 6 m of travel?
Question 5 options:
The object was moving at a constant speed.
The object was accelerating.
The object was not moving.
The object was northbound.
Answer:
It is D
Explanation: Use of these terms stretches back to World War I. One American field order from September 1918 noted, “The First Army will attack at H-Hour on D-Day with the object of forcing the evacuation of the St. Mihiel salient.” Other nations had their own shorthand. In World War I, the French used the code date “le Jour J,” while the British called their operation start days “Z-Day” and “Zero Hour.”
Hope this helps
You and your younger sister (who weighs half as much you do) are at a skating rink. You and your sister's both move backward but your sister accelerates at a greater rate.
What is acceleration?The time rate of change of velocity with time.
As both are holding each other, they will be pushed backwards because the skating they wear makes them to move backwards. The equal and opposite force is applied on each other.
The force F =mass x acceleration.
The lesser mass greater will be the acceleration. Your sister with half weight of yours will accelerate more.
Thus, you and your sister's both move backward but your sister accelerates at a greater rate.
Learn more about acceleration.
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Which law best describes contact force
A.
second law
B.
third law
C.
law of gravity
D.
first law
Answer:
b is the answer the third law
Explanation:
B because Newton's second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.
a metal rod has drawing pins stuck to it with wax and is heated at one end...
a)what do you think will happen in this experiment?explain your answer
b)how could this experiment be adapted to compare the codnucting properties of different materials?
Elements grouped as a column on the periodic table belong to a ______.
Identify the palindromic base sequence in the DNA donor molecule shown.
Answer the pic above
Nonsense/incorrect = auto report...
Explanation:
Since a double helix is formed by two paired antiparallel strands of nucleotides that run in opposite directions, and the nucleotides always pair in the same way (adenine (A) with thymine (T) in DNA or uracil (U) in RNA; cytosine (C) with guanine (G)), a (single-stranded) nucleotide sequence is said to be a palindrome
How do I solve this arithmetic sequence?
Answer:
The 16ᵗʰ term of this sequence is 82
Step-by-step explanation:
Here,
First Term = a₁ = 9
Common Difference = (d) = 2
Now, For 16ᵗʰ term, n = 16
aₙ = a + (n - 1)d
a₁₆ = 7 + (16 - 1) × 2
a₁₆ = 7 + 15 × 5
a₁₆ = 7 + 75
a₁₆ = 82
Thus, The 16ᵗʰ term of this sequence is 82
-TheUnknownScientist
Please help me with this (20 points)
Answer:
1. troposphere
2. troposphere (still)
3. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.
4.The stratosphere is where you'll find the very important ozone layer. The ozone layer helps protect us from ultraviolet radiation (UV) from the sun. In fact, the ozone layer absorbs most of the UV radiation the sun sends to us. Life as we know it wouldn't be possible without this layer of protection.
5. It contains the ozone, which protects Earth from the sun's radiation. Why aren't there many meteors in the troposphere? They burn up before they reach the troposphere.
Explanation:
1.The troposphere is the atmospheric layer closest to the planet and contains the largest percentage (around 80%) of the mass of the total atmosphere. Temperature and water vapor content in the troposphere decrease rapidly with altitude.
2.The layer closest to Earth's surface is the troposphere, reaching from about seven and 15 kilometers (five to 10 miles) from the surface. The troposphere is thickest at the equator, and much thinner at the North and South Poles.
3. Explained in the answer.
4. Explained in the answer.
5. Explained in the answer.
what is the geologic time scale and how is it used
Answer:
It is a type of map used to map out the geographical change over time. I believe
Explanation:
What is the average speed of a car that travelled 400 miles in 6 hours?
Answer:
About 66 miles per hour
Explanation:
Based on the information given we can assume the car traveled the same number of miles every hour meaning all we need to do is divide.
400/6 ≈ 66 miles per hour
Answer
66 mph
Explanation:
400 ÷ 6 = 66.666666666666666.......
Please solve this worksheet for me It’s very important please don’t write unnecessary things or else I’ll report please help me i request
Answer:
1. 231.25 mL
2. 218.75 kPa
3. 6.21 L
4. 427.5 mL
5. 83.01 mL
6. 307.6 mL
7. 1.15 L
8. 440.4 mL
Explanation:
This questions describes Boyle's law. Using Boyle's law equation to solve the questions as follows:
P1V1 = P2V2
Where;
P1 = initial pressure
P2 = final pressure
V1 = initial volume
V2 = final volume
Please find the answers to each question as an attachment.
Explain the law of inertia in your own words.
A
An object at rest will remain at rest unless acted on by a force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by a force.
Explanation:
Answer:
Law of inertia is Newton's first law of motion..
Explanation:
It means that a body will tend to be in it's motion or tend to move in a straight line unless any external force is acted upon it..
Eg: while you are travelling in bus.. If breaks are suddenly applied your body falls forward because you were in motion with bus but it tries to be in motion when breaks are applied...
