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

Answers

Answer 1

The woman's average velocity can be calculated by dividing the total distance covered during the motion by the total time of the motion.

In the first part of the motion, the woman moved south with speed v1=2.00 m/s for a time of
[tex]t_1 = 60.0 m = 3600 s[/tex]
therefore the distance she covered is
[tex]S=v_1 t_1 = (2.00 m/s)(3600 s)=7200 m[/tex]

In the second part of the motion, she moved north for [tex]S_2 = 3000 m[/tex] in a time of
[tex]t_2 = 25.0 m = 1500 s[/tex]

Since she moved in the opposite direction, the total distance covered is the difference between S1 and S2:
[tex]S=S_1 - S_2 = 7200 m - 3000 m = 4200 m[/tex] (south)

While the total time of the motion is
[tex]t=t_1 + t_2 = 3600 s + 1500 s =5100 s[/tex]

Therefore, the woman's average velocity is
[tex]v= \frac{S}{t}= \frac{4200 m}{5100 s}=0.824 m/s [/tex] (south)

and the correct answer is A).

Answer 2

Final answer:

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 min

Therefore, 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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Related Questions

An oscillating block - spring system has a mechanical energy of 1.10 j, and amplitude of 11.0 cm, and a maximum speed of 1.7 m/s. find the spring constant.

Answers

The total mechanical energy of the block-spring system is given by the sum of the potential energy and the kinetic energy of the block:
[tex]E=U+K= \frac{1}{2}kx^2 + \frac{1}{2}mv^2 [/tex]
where
k is the spring constant
x is the elongation/compression of the spring
m is the mass of the block
v is the speed of the block

At the point of maximum displacement of the spring, the velocity of the block is zero: v=0, so the kinetic energy is zero and the mechanical energy is just potential energy of the spring:
[tex]E= \frac{1}{2}kA^2 [/tex] (1)
where we used x=A, the amplitude (which is the maximum displacement of the spring).
Since we know
A = 11.0 cm= 0.11 m
E = 1.10 J
We can re-arrange (1) to find the spring constant:
[tex]k= \frac{2E}{A^2} = \frac{2 \cdot 1.10 J}{(0.11 m)^2}=181.8 N/m [/tex]

change 75 inches to feet

Answers

6.25ft hope this helps

6.25 feet would be the answer

What equation would you use to calculate the ideal mechanical advantage of a wheel and axle if the input force is applied to the axle?

Answers

Find the maximum output force and minimum input force.

The map of the world is overlaid with the boundaries of the tectonic plates. Look at the location marked with an asterisk (*). What geologic feature would expect to find at that location and why? A) rift zone; two plates move in opposite directions B) island arc; two oceanic plates meet at a convergent boundary C) mountains; two continental plates meet at a convergent boundary D) deep sea trench; subduction where two plates meet and one goes underneath the other

Answers

C) mountains; two continental plates meet at a convergent boundary

Octane is an important component of gasoline. Octane will ignite at a temperature of 428°F. What is this temperature on the Celsius scale?

Answers

The requirement is to change the °F to °C scale. That is;

T(°C) = [T(°F) - 32]/1.8

Substituting;

T(°C) = [428 - 32]/1.8 = 396/1.8 = 220 °C.

Therefore, 428°F will be 220°C on Celsius scale.

What are (a) the kinetic energy, (b) the rest energy, and (c) the total energy of a 1.50 g particle with a speed of 0.600 c ?

Answers

kinetic energy = 1/2 m v^2 = 1/2 x1.5 x10^-3 x 0.36

How much heat in joules is needed to vaporize an 18.0 gram sample of water at 100c?

Answers

The water is already at its boiling point [tex](T=100^{\circ}C)[/tex], therefore we don't need additional heat to increase its temperature. Instead, we have to give the heat necessary to make it evaporate. The energy needed is equal to
[tex]Q=m L_v[/tex]
where
m is the mass of the water
Lv is the latent heat of evaporation

The latent heat of evaporation of water is [tex]L_v = 2265 J/g[/tex], and the mass of this sample of water is [tex]m=18.0 g[/tex], therefore the heat needed to vaporize the water is
[tex]Q=mL_v = (18.0 g)(2265 J/g)=4.08 \cdot 10^4 J =40.8 kJ[/tex]

The magnetic flux through each loop of a 75-loop coil is given by (8.8t−0.51t3)×10−2t⋅m2, where the time t is in seconds.

Answers

To determine the emf as the function of time emf of the coil which is induced is
E = -NdФ/dt
= -(75) d/dt ((8.8-0.5Lt³) × 10⁻²)
=-(75) (8.8-0.51(3+2)) ₓ 10⁻²
=-6.6 + 1.15t²) V
The value of t = 1.1s and t= 3.15
t = 1.1s, where induced emf is
E = (-6.6 +1.15 (1.1)²)
=-5.23V
At t= 3.1s, where induced emf is
E = (-6.6 +1.15(3.1)²)
=4.45V

Final answer:

The magnetic flux through each loop of a coil can be calculated using the given expression. The magnetic moment of the coil can be found by multiplying the current and the area of the loop. Faraday's law states that a changing magnetic flux induces an electromotive force in a circuit.

Explanation:

The magnetic flux through each loop of a 75-loop coil can be calculated using the expression: (8.8t−0.51t³)×10−²t⋅m², where t represents time in seconds. The magnetic flux is a measure of the magnetic field passing through a surface. It can also be calculated using the product of the magnetic field strength and the area of the loop.

The magnetic moment of the coil can be found using the formula μ = IA, where I is the current and A is the area of the loop. Substituting the given values, we find that the magnetic moment equals 2.5 × 10⁻⁶ A·m².

Faraday's law states that a changing magnetic flux through a loop induces an electromotive force (emf) in the circuit. Therefore, if the current through the coil varies with time, the magnetic flux will change accordingly and an emf will be induced in the circuit.

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What factors determine power

Answers

The factors that are used to determine power are: Voltage, Current, and the Power Factor.

In the visible spectrum, red light has the lowest frequency and violet light has the highest. List the following colors in order of increasing energy. green blue yellow orange A) blue, green, yellow, orange B) orange, yellow, green, blue C) yellow, orange, blue, green D) green, blue, orange,w

Answers

The correct answer is:
B) orange, yellow, green, blue

the energy of the photons of light is directly proportional to the frequency of the light. This means that the lower the frequency, the lower the energy, and the higher the frequency, the greater the energy.

Therefore, the order in increasing energy is exactly the same as the order in increasing frequency, which is:

orange, yellow, green, blue

The answer is b !!!!!!

Which change occurs when an atom undergoes decay?

Answers

When an atom undergoes decay its nucleus becomes unstable because it does not have a balance of neurons and protons. This means the atoms try to find a confirmation in which it is stable. In doing so, it is possible that the atom changes its element, and it frees a huge amount of energy in order to balance itself. This is the base of radioactivity.

lion and leopard are two of Africa's large cat ____.

Answers

The fill in blank would be breeds.
Lions and leopards are both cats, but they are different kinds.

I hope this helps! Let me know if you need further explanation.
~Brooke❤️

Compute the resistance in ohms of a silver block 10 cm long and 0.10 cm2 in cross-sectional area. ( = 1.63 x 10-6 ohm-cm)

Answers

The resistance of the silver block is given by
[tex]R= \frac{\rho L}{A} [/tex]
where
[tex]\rho=1.63 \cdot 10^{-6} \Omega \cdot cm[/tex] is the silver resistivity
[tex]L=10 cm[/tex] is the length of the block
[tex]A=0.10 cm^2[/tex] is the cross-sectional area of the block

If we plug the data into the equation, we find the resistance of the silver block:
[tex]R= \frac{(1.63 \cdot 10^{-6} \Omega \cdot cm)(10 cm)}{0.10 cm^2}=1.63 \cdot 10^{-4} \Omega [/tex]

Answer:

1.6 x 10^-4 Ω

Explanation:

Most objects emit infrared energy. how do humans recognize this? A.their skin senses it as warmth B. Their vision becomes clearer C. They experience goose bumps on their skin D. They see light emitted from the object

Answers

A. Their skin senses it's warmth.

Answer: The correct answer is "their skin senses it as warmth".

Explanation:

Electromagnetic wave: the direction of electric field and magnetic field are perpendicular to the direction to the propagation of the wave. It travels with the speed of the light.

For example, X-rays, gamma rays, infrared rays and visible region.

Infrared radiation: The range of the wavelength is from 700 nm to 1 mm. It is longer than the visible light. It is a part of the electromagnetic spectrum.

The infrared radiations cannot be seen by naked eyes of human. It can be felt by the human being. They can sense it as heat.

It is given in the problem that most objects emit infrared energy. Human can feel this infrared radiation. Their skin senses it as warmth.

Nikolas had an idea that he could use the compressed carbon dioxide in a fire extinguisher to propel him on his skateboard.
Which of Newton’s laws would he have used to come up with this idea?

Answers

The Newton’s law Nikolas would use to come up with this idea is the Third law that states:

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

So, in this case, let's name the first Body A which is the skateboard and the second body B which is the compressed carbon dioxide in a fire extinguisher. Then, as shown in the figure below, according to the Third law:

[tex]FA = -FB[/tex]

Answer:

Newton's Third Law

Explanation:

Did the assignment

The distance between two consecutive crests is 2.5 meters. Which characteristic of the wave does this distance represent?
amplitude
frequency
period
wavelength
phase

Answers

The correct answer is "wavelength".

In fact, the wavelength of a wave corresponds to the distance between two consecutive same-shape points of the wave: for instance, the distance between two consecutive crests, or the distance between two consecutive throughs.

For the wave in this problem, the distance between two consecutive crests is 2.5 meters, therefore the wavelength of the wave is 2.5 m.

You illuminate a slit of width 0.0675 mm with light of wavelength 711 nm and observe the resulting diffraction pattern on a screen that is situated 2.21 m from the slit. what is the width, in centimeters, of the pattern\'s central maximum?

Answers

In the single-slit experiment, the displacement of the minima of the diffraction pattern on the screen is given by
[tex]y= \frac{n \lambda D}{a} [/tex]
where
n is the order of the minimum
y is the displacement of the nth-minimum from the center of the diffraction pattern
[tex]\lambda[/tex] is the light's wavelength
D is the distance of the screen from the slit
a is the width of the slit

In our problem,
[tex]a=0.0675 mm=6.75 \cdot 10^{-5} m[/tex]
[tex]\lambda=711 nm = 7.11 \cdot 10^{-7} m[/tex]
[tex]D=2.21 m[/tex]

And the distance of the first minimum (n=1) from the center of the pattern is
[tex]y= \frac{n \lambda D}{a}= \frac{(1) (7.11 \cdot 10^{-7} m)(2.21 m)}{6.75 \cdot 10^{-5} m}=2.33 \cdot 10^{-2} m =2.33 cm [/tex]

The problem asks for the width of the pattern's central maximum. This will be equal to the distance between the first minimum on one side and the first minimum on the other side, so it will be equal to twice the distance we just found:
[tex]\Delta y_{max} = 2 y = 2\cdot 2.33 cm= 4.66 cm[/tex]

light travels through a substance at 1.97x10^8. what is the index of the liquid?

Answers

In finding the index of refraction, we use this formula n= c/v

where n is the index of refraction
c is velocity of light in vacuum, this is constant and is equivalent to 3x10^8 m/s
v is the velocity of light in a particular medium, in here we use 1.97x10^8 m/s

Using the formula,

n = (3x10^8 m/s) / (1.9x10^8 m/s)
n = 1.52284264
n = 1.52

Hope this helps. :)

n = c / v
n = index of refractionc = velocity of light in vacuum = 3x10^8 m/sv = 1.97x10^8 m/s

n = (3x10^8 m/s) / (1.9x10^8 m/s)n = 1.52

the index of the liquid is 1.52

A transformer is a device that increases or decreases voltage. t/f

Answers

A transformer is a device that increases or decreases voltage. t/f

The answer is: True my dude

Answer:

True.

Explanation:

A transformer is used either to increase or decrease the voltage.

It has two separate sets of coils of wire. The coils connected to the input voltage are called primary and the output coils are called secondary.

If number of windings (or coils) of wire in primary are less than the windings in secondary, it is a step up transformer because output voltage will be more than the input voltage. In this case the output voltage given out by the secondary will be more than the primary.

If the primary coils are more than the secondary, it is called a step down transformer. In this case, secondary voltage (output voltage) will be less than the primary.

What condition is necessary for a moving object to produce a shockwave?

Answers

When an object passes through the air, it creates a series of pressure waves in front of it and behind it, similar to the bow and stern waves created by a boat. These waves travel at the speed of sound.

The atmosphere _________ most of the incoming visual radiation.
A. Absorbs
B. Transmits
C. Reflects

Answers

The answer is Transmit. The atmosphere transmit most of the incoming visual radiation.

Answer:

Absorbs

Explanation:

When the solar radiation or visual radiation arrives on Earth's atmosphere, most of the radiation is absorbed.

A part is reflected and transmitted back but major portion is absorbed by the atmosphere.

This absorb radiation helps to keep the Earth warm and thus maintaining the temperature even in Night time.

What is the energy q released in the first step of the thorium-232 decay chain? the atomic mass of 232 90th is 232.038054 u and the atomic mass of 228 88ra is 228.0301069 u. express your answer numerically in megaelectron volts?

Answers

Answer: The energy released in the given nuclear reaction is 4.98 MeV.

Explanation:

The equation for the alpha decay of Th-232 nucleus follows:

[tex]_{90}^{232}\textrm{Th}\rightarrow _{88}^{228}\textrm{Ra}+_{2}^{4}\textrm{He}[/tex]

We are given:

Mass of [tex]_{90}^{232}\textrm{Th}[/tex] = 232.038054 u

Mass of [tex]_{88}^{228}\textrm{Ra}[/tex] = 228.0301069 u

Mass of [tex]_{2}^{4}\textrm{He}[/tex] = 4.002602 u

To calculate the mass defect, we use the equation:

[tex]\Delta m=\text{Mass of reactants}-\text{Mass of products}[/tex]

Putting values in above equation, we get:

[tex]\Delta m=(m_{Th})-(m_{Ra}+m_{He})\\\\\Delta m=(232.038054)-(228.0301069+4.002602)=0.0053451u[/tex]

To calculate the energy released, we use the equation:

[tex]E=\Delta mc^2\\E=(0.0053451u)\times c^2[/tex]

[tex]E=(0.0053451u)\times (931.5MeV)[/tex] (Conversion factor: [tex]1u=931.5MeV/c^2[/tex] )

[tex]E=4.98MeV[/tex]

Hence, the energy released in the given nuclear reaction is 4.98 MeV.

Sonic boom from a plane is an example of a shockwave. Give another example where a shockwave is produced

Answers

Sonic boom can also be created from an atomic bomb going off.

A rod made from insulating material carries a net charge, while a copper sphere is neutral. The rod and the sphere do not touch. Is it possible for the rod and the sphere to (a) attract one another and (b) repel one another? Explain.

Answers

As the charged insulating rod approaches the sphere (not in contact), free electrons in the sphere move. If the rod is negatively charged, free electrons move to the side of the sphere opposite the side with the rod. If the rod is positively charged, the free electron moves to the side of the sphere with the rod. In either case, the region of the sphere near the rod acquires a charge with the sign opposite to that on the rod.

a. Since opposedly charged objects always attract each other, the rod and ball always experience mutual attractive forces.

b. Since the side of the sphere near the bar always has the opposite charge to the charge of the rod, the rod and the sphere always attract each other. They do not repel each other.

Answer:

Sphere R must be negative and Sphere S must be positive or neutral.

Explanation:

Castle Learning. Also the Rod diagram shows electrons in it and we know like charges repel and opposites attract, so the rod must repel Sphere R because it is negative and attract to Sphere S because it is the opposite.

When ultraviolet light with a wavelength of 254 nm falls on a clean copper surface, the stopping potential necessary to stop emission of photoelectrons is 0.181 v. part a what is the photoelectric threshold wavelength for this copper surface?

Answers

The ultraviolet wavelength λ = 254nm the stopping potential of copper surface,
V₀ = 0.18W
Now the relation between threshold wavelength and stopping potential is
eV₀ = λc (1/λ - 1/λ₀)
1/λ - 1/λ₀ = eV₀/λc
1/λ₀ = 1/λ eV/λc
= 1/ 254 × 10⁻⁹m - 1.6 10⁻¹⁹C)(0.181v)/6.625 × 10⁻³⁴ Js (3×10⁸m/s
0.00393 × 10⁹ - 0.01457×10⁷
= 0.378 ×10⁷
λ₀ = 264 × 10⁻⁹m or
264nm

The photoelectric threshold wavelength for this copper surface is 264 nm

Further explanation

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is :

[tex]\large {\boxed {E = h \times f}}[/tex]

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

The photoelectric effect is an effect in which electrons are released from the metal surface when illuminated by electromagnetic waves with large enough of radiation energy.

[tex]\large {\boxed {E = \frac{1}{2}mv^2 + \Phi}}[/tex]

[tex]\large {\boxed {E = qV + \Phi}}[/tex]

E = Energi of A Photon ( Joule )

m = Mass of an Electron ( kg )

v = Electron Release Speed ( m/s )

Ф = Work Function of Metal ( Joule )

q = Charge of an Electron ( Coulomb )

V = Stopping Potential ( Volt )

Let us now tackle the problem !

Given:

λ = 254 nm = 2,54 × 10⁻⁷ m

V = 0.181 Volt

c = 3 × 10⁸ m/s

h = 6.63 × 10⁻³⁴ Js

q = 1.6 × 10⁻¹⁹ C

Unknown:

λ₀ = ?

Solution:

[tex]E = qV + \Phi[/tex]

[tex]h f = qV + h f_o[/tex]

[tex]h \frac{c}{\lambda} = qV + h \frac{c}{\lambda_o}[/tex]

[tex]6.63 \times 10^{-34} \times \frac{3 \times 10^8}{2.54 \times 10^{-7}} = 1.6 \times 10^{-19}(0.181) + 6.63 \times 10^{-34} \times \frac{3 \times 10^8}{\lambda_o}[/tex]

[tex]7.83 \times 10^{-19} = 2.896 \times 10^{-20} + \frac{1.989 \times 10^{-25}}{\lambda_o}[/tex]

[tex]\frac{1.989 \times 10^{-25}}{\lambda_o} = 7.83 \times 10^{-19} - 2.896 \times 10^{-20}[/tex]

[tex]\lambda_o \approx 2.64 \times 10^{-7} ~ m[/tex]

[tex]\large {\boxed{\lambda_o \approx 264 ~ nm} }[/tex]

Learn morePhotoelectric Effect : https://brainly.com/question/1408276Statements about the Photoelectric Effect : https://brainly.com/question/9260704Rutherford model and Photoelecric Effect : https://brainly.com/question/1458544

Answer details

Grade: College

Subject: Physics

Chapter: Quantum Physics

Keywords: Quantum , Physics , Photoelectric , Effect , Threshold , Wavelength , Stopping , Potential , Copper , Surface , Ultraviolet , Light

Reflection is the bouncing of light rays off of a surface. Which situation is NOT an example of reflection?
A) looking at yourself in a mirror
B) focusing light through a camera lens
C) seeing an image of yourself in a still lake
D) looking at your teacher at the front of the class

Answers

B) Focusing light through a camera lens.

In each of the other options, light rays bouncing off a surface produce an image.

The answer is B, Focusing light through a camera lens.s

what happens when ice transform into steam

Answers

Liquid water can turn into a gas at any temperature. We say it evaporates. Evaporation happens fastest when water is heated to 212oF(100oC). When steam or water vapor cools down it turns back to liquid water

Answer:

The thermal kinetic energy of the molecules is raised

Explanation:

As it takes some amount of heat energy to be converted to thermal energy to turn ice into water and water into a stream. As this state change, the temperature will rise again. As the energy generated is being measured in Joule, a more commonly studied unit is a calorie. As matter vary in their capacity to absorb heat. Like ice needs about 0.50 as specific heat, water as 1.00 and stream 0.48 cal/g in degrees C. As the matter is heated the latent or hidden energy is released and tends to remain until the material changes its state.

A battery is the power source for what type of current?
A. AC
B.BC
C.DC
D.All types of current

Answers

A battery is the power source for DC. (C)

You COULD use a battery to get AC, but you'd need some electronics,
to take the DC from the battery and use it to generate AC.

Answer:

C. DC

Explanation:

A battery is the power source for DC type of current. A battery is a source of constant potential difference that produces a constant current unlike in AC source where the voltage and hence the current changes its polarity continuously.Hence, the current produced by battery is direct current and not Alternating current.

Which statement is true?

Voltage varies throughout a parallel circuit.

Voltage remains the same throughout a parallel circuit.

Answers

voltage remains the same throughout a parallel circuit

Final answer:

In a parallel circuit, the voltage remains constant throughout. An analogy using a bike path explanation further simplifies this concept.

Explanation:

In the world of physics, it is true to say: 'Voltage remains the same throughout a parallel circuit'. To further illustrate this concept, consider a bike path as an analogy for a circuit.

If a parallel circuit was a bike path, then each 'fork' in the path represents a separate path for the electricity. Think of the voltage as a measure of energy.

Even though cyclists (or charges) can take different paths (resistors), they all start at the same height (self-same voltage).

Therefore, they all have the same amount of potential energy (voltage) at any point.

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Unknown element X is a metal that ionically bonds to sulfur.

Is the formula, X3S feasible? Why or why not?

A) It is feasible. The three metallic ions each receive an electron from sulfur.
B) No, it is not feasible. Sulfur cannot give three electrons to the metal since the sulfide ion has a -2 charge.
C) No, it is not feasible. The metallic ion X only has one valence electron and the sulfide ion receives two electrons.
D) No, it is not feasible. Three metallic ions cannot provide the exact number of electrons that one sulfur needs for the ionic bond.

Answers

The answer is D. No, it is not feasible. Three metallic ions cannot provide the exact number of electrons that one sulfur needs from the ionic bond.

Sulfur is found in Group 6A, which means that it needs two electrons to form an octet for bonding. In order for it to form an ionic bond it should receive the same number of electrons it is missing. The metallic ion X cannot give 3, because that would mean there would be an excess each time. As such, the formula X3S will not be feasible.

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