As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. she then turns around and walks north a distance 3000 m in 25.0 minutes (a) what is the woman's average velocity during her entire motion?
a.0.824 m/s south
b.1.93 m/s south
c.2.00 m/s south
d.1.79 m/s south
e.800 m/s south
The woman's average velocity during her entire motion is approximately 1.79 m/s south.
Explanation:To find the woman's average velocity, we need to calculate the total displacement and divide it by the total time taken. Southward motion is taken as negative, and northward motion is taken as positive. Let's calculate:
Southward motion: displacement = -2.00 m/s × 60.0 min = -120.00 mNorthward motion: displacement = 3000 mTotal displacement = -120.00 m + 3000 m = 2880.00 mTotal time = 60.0 min + 25.0 min = 85.0 minTherefore, the woman's average velocity is:
average velocity = total displacement / total time
average velocity = 2880.00 m / 85.0 min
average velocity ≈ 33.88 m/min
To convert to m/s, we divide by 60:
average velocity ≈ 33.88 m/min ÷ 60 ≈ 0.5647 m/s
Since the woman was walking southward, the average velocity is negative. So the correct answer is Option d. 1.79 m/s south.
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I need help finding the answer:
When a guitar string plays the note "A", the string vibrates at 440 Hz. What is the period of the vibration?
The period of the guitar string's vibration when it plays the note 'A' is approximately 0.00227 seconds.
Explanation:In physics, the period of vibration refers to the time it takes for a single complete cycle of vibration to occur. It is usually represented by the symbol T and is measured in seconds. To find the period of the guitar string's vibration, you can use the formula T = 1/f, where f is the frequency of the vibration.
In this case, the frequency of the guitar string playing the note 'A' is given as 440 Hz. So, the period can be calculated as T = 1/440 = 0.00227 seconds.
Therefore, the period of the guitar string's vibration when it plays the note 'A' is approximately 0.00227 seconds.
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Calculate the absolute pressure at the bottom of a freshwater lake at a point whose depth is 27.8 m. assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kpa.
A relatively long lived excited state of an atom has a lifetime of 2.05 ms. what is the minimum uncertainty (in ev) in its energy?
a 10.0 kg ball falling at 10.0 m/s hits a mattress and comes to a complete stop in 1 s. what force does the mattress exert to stop the ball
Acceleration is best defined as the rate of change of ________ of an object.
Answer:
Velocity
Explanation:
Remember that acceleration is given by the next formula:
Acceleration: Vf-Vo/Time
Where Vf final velocity and Vo is initial velocity, so acceleration of an object is best defined as the change in velocity the an object experiences in a certain period of time, it is often described in M/s^2 and those are the units in the international system.
Allison wants to calculate the speed of a sound wave. Which formula should she use?
distance traveled / amplitude
number of wavelengths / amplitude
number of wavelengths / time
distance traveled / time
Answer:
Option 4th is correct
distance traveled / time
Explanation:
Allison wants to calculate the speed of a sound wave.
The speed of the sound wave is the distance traveled divided by the time.
[tex]v = \dfrac{d}{t}[/tex]
Where, v = speed of sound
d = distance
t= time
Therefore, The formula should she use is, distance traveled / time
A boat is moving at 3 m/s and increases its speed at 2 m/s2. How fast is it moving after it travels 10 m from the point it begins to speed up?
If 1495 j of heat is needed to raise the temperature of a 351 g sample of a metal from 55.0°c to 66.0°c, what is the specific heat capacity of the metal?
sorry i don't know the answer i'm really sorry
Why are conductors and insulators both required to construct the electrical wiring in our home
Jupiter _____.
may have prevented asteroids from forming a planet
has a large gravitational field which can capture small comets
is responsible for creating most known meteors and meteoroids
releases radiation which warms comets and creates a comet tail
Answer:
Jupiter may have prevented asteroids from forming a planet
Explanation:
What is the wavelength of a photon whose energy is twice that of a photon with a 622 nm wavelength?
Two astronauts are playing catch with a ball in space. The first astronaut throws the ball; and A) the ball moves, but the astronaut doesn’t. B) the ball moves, and so does the astronaut. C) the ball doesn’t move, but the astronaut does. D) the ball doesn’t move, and neither does the astronaut.
B) the ball moves, and so does the astronaut.
Two astronauts are playing catch with a ball in space. The first astronaut throws the ball, and the ball moves, and so does the astronaut because of the action-reaction law. When the ball goes forward, the astronaut goes backward.
plz give me the brainliest
Two astronauts are playing catch with a ball in the space. One astronaut throws the ball, then the ball moves, and so does the astronaut. Hence, option B is correct.
What is Newton's third law?Newton's third law states that if two bodies meet, they exert forces on each other that are comparable in size and directed in the opposite direction.
Action and reaction law is another name for the third law. This law is critical in understanding issues involving static equilibrium, in which all the forces are in balance, but it also holds true for entities moving uniformly or quickly.
A game of catch is being played in space by two astronauts. A ball is thrown by the first astronaut, and thanks to the action-reaction rule, both the ball and the astronaut move. The astronaut is forced to move backwards as the ball advances.
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Which of these statements would best explain the problem encountered with nuclear waste disposal?
Answer: A
Explanation:
A 5.3 kg cat and a 2.5 kg bowl of tuna fish are at opposite ends of the 4.0-m-long seesaw. how far to the left of the pivot must a 3.7 kg cat stand to keep the seesaw balanced?
To keep the seesaw balanced, the 3.7 kg cat must stand 2.06 meters to the left of the pivot.
Explanation:To keep the seesaw balanced, the torques (rotational forces) on both sides of the pivot must be equal. The torque is given by the product of the mass and the distance from the pivot. In this case, the 5.3 kg cat and the 2.5 kg bowl of tuna fish create a torque on one side, while the 3.7 kg cat creates a torque on the other side. Let's denote the distance from the pivot to the 5.3 kg cat as x:
Torque on one side = 5.3 kg * x
Torque on the other side = 2.5 kg * 1.5 m + 3.7 kg * (4 m - x)
Setting these two torques equal to each other and solving for x:
5.3 kg * x = 2.5 kg * 1.5 m + 3.7 kg * (4 m - x)
Simplifying the equation:
5.3x = 3.75 + 14.8 - 3.7x
9x = 18.55
x = 2.06 meters
Therefore, the 3.7 kg cat must stand 2.06 meters to the left of the pivot to keep the seesaw balanced.
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How can medical assistant use the knowledge of the nervous systems to care for the patient with Parkinson’s and other neurological disorders
Having a wide knowledge of the nervous system and the of how the brain’s different parts collaborate to organize all our movements, senses thoughts, and emotions enable the medical assistants to handle the cognitive and behavioral complications in the patient. It helps them to deal with wounds and falls since the nervous disorder generally affects cognition and movement. Having a wide knowledge of how the nerve impulses are transmitted from the nervous system to the brain, when it is then converted into feelings such as pleasure, pain, cold or hot, the medical assistant will be able to take response immediately on the patient prior they start complaining of sensory indications, such as discomfort, irritating, and unresponsiveness.
How many significant digits are in the measurement 50.003010 nm?
Answer:
Significant digits = 8
Explanation:
Significant digits in a number which is more than 1 and if the number if having decimal in it then as per the rule all the digits present in the number must be significant digit
for an example we will say
1.00 = 3 significant figures
so in this way for all such kind of numbers we have to count all digits in it
so here given number is more than 1 and it contains the decimal in it
so we will say
50.003010 nm = 8 significant figures
Answer:
There are 15 significant digits
Explanation:
50.00301 nm = 0.0000000500301
Counting the figures makes it 15
A crate of mass 5 kg slides along a horizontal surface with coefficient of kinetic friction of 0.3. the force is pulled by a rope that makes an angle of 30o above the horizontal. the tension in the rope is 150 n. what is the power supplied by the rope to the crate at an instant where the box is moving at a speed of 3 m/s in the direction the rope is pulling it?
The potential energy due to the strong interaction, between two quarks or a quarkantiquark pair, goes something like v (r) = −α/r + βr, where α and β are positive constants. is there any point rv where the potential energy goes to zero? is there any point
The lengthening of a transmitted signal's wavelength and/or a decrease in its frequency, which indicates that the object is moving away from the observer, is called the
The red shift... Hope it helps!
The polar ice caps of mars is believed to consist mostly of
A parallel circuit has two 8.0-ohm resistors and a power source of 9.0 volts. If a 12.5-ohm resistor is added to the circuit in parallel, how will the current be affected and what value will it have?
Answer:
1/R1 + 1/R2 + ... = 1/Re
So...
1/17.2 + 1/22.4 = 1/Re
0.1021 = 1/Re
Re = 9.792 Ohms
Now use the Voltage equation V = IR
6 = I * 9.792
I = 6/9.792 = 0.613 Amps.Pato 0.61
Explanation:
What is the wavelength λ of light in glass, if its wavelength in air is λ0, its speed in air is c, and its speed in the glass is v? express your answer in terms of λ0, c, and v?
The wavelength λ of light in glass, if its wavelength in air is λ0, its speed in air is c, and its speed in the glass is v will be
[tex]\lambda=\dfrac{v}{c}\lambda_o[/tex]
What is wavelength?
The wavelength of any wave is defined as the distance between two max adjacent amplitudes, or the distance between two successive troughs or crest.
When an electromagnetic wave moves from a medium to another medium, its frequency remains constant. In this problem, we have light (which is an electromagnetic wave) moving from air to glass (or vice-versa), so we can write
[tex]f_o=f(1)[/tex] (1)
where is the frequency of the light in air, while f is the frequency in glass.
Using the relationship between frequency, wavelenght and speed of a wave, we have
[tex]f=\dfrac{v}{\lambda}[/tex]
where v is the speed of light in glass and the wavelength in glass, and
[tex]f_o=\dfrac{c}{\lambda_o}[/tex]
where c is the speed of light in air and the wavelength in air. Using these two relationships, we can rewrite eq.(1) as
[tex]\dfrac{c}{\lambda_o}=\dfrac{v}{\lambda}[/tex]
and by re-arranging it, we find
[tex]\lambda=\dfrac{v}{c} \lambda_o[/tex]
Hence the wavelength λ of light in glass, if its wavelength in air is λ0, its speed in air is c, and its speed in the glass is v will be
[tex]\lambda=\dfrac{v}{c}\lambda_o[/tex]
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with a bar magnet where are the lines of force closest together
Answer: at the tips of the magnet
Explanation: charges are more at the tip of a substance so likewise for a magnet
In the past, how did people use the systematic movement of celestial bodies? Select all that apply.
making agricultural decisions
shipping navigation
predicting the future
spiritual and religious practices
tracking storms
In past, people used the systematic movement of celestial bodies for making agricultural decisions, shipping navigation and for spiritual and religious practices.
Answer: Options 1, 2, and 4
Explanation:
The observation of systematic movement of celestial bodies comes under the field of Astrometry. The celestial mechanics which defines are the movement of celestial bodies is also a kind of Astrometry.
The celestial mechanics is used by the people in past to help in navigation during ship journey. Even the astrometry will help in predicting the seasons to be coming which will help in making agricultural decisions.
In astrology, the position of celestial bodies help in deciding the time for spiritual and religious practices. So, in ancient days, people used the systematic movement of celestial bodies in naked eyes to decide these.
A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. what is the lowest frequency associated with this portion of the spectrum? (c 3.00 108 m/s)
What waves shown on the electromagnetic spectrum disturb the medium it passes through at answer?
Which property of light remains unchanged when it enters a different medium?
frequency d is the anwsewr
A calorie is the measurement of ____ required to raise a 1 gram of water 1 degree celsius.
When light propagates from a material with a given index of refraction into a material with a smaller index of refraction, the speed of the light vie?
When light moves from a material with a higher index of refraction to one with a lower value, the speed of light increases, potentially causing the light to refract. The index of refraction ratio determines the extent of this change in speed.
When light travels from a material with a higher index of refraction to one with a lower index of refraction, the speed of light in the material increases. The index of refraction, denoted as n, is defined by the ratio n = c/v, where c is the speed of light in a vacuum (approximately 3.0 * 10⁻⁸ m/s), and v is the observed speed of light in the material.
Since the index of refraction for a vacuum is exactly 1 (because the speed of light in a vacuum is c), and since n is always greater than or equal to 1, when light enters a material with a smaller n, it means that v must increase."
For example, when light moves from water (where it travels slower due to a higher n) into air (with a smaller n), the light speeds up. This change in speed can cause the light to bend or refract. The extent to which this bending occurs depends on the difference in the indices of refraction between the two materials.