a physicist (mass 99 kg) is standing on a scale in an elevator. while he is going down, the elevator is slowing down with 2.7 m/s2. what does the scale show?
Answers
The scale shows the force exerted by the physicist on it, which is equal to the net force acting on the physicist. The scale will show a reading of 702.89 N while the physicist is going down in the elevator.
To solve this problem, we need to analyze the forces acting on the physicist and apply Newton's second law of motion, which states that the net force acting on an object is equal to its mass times its acceleration.
When the elevator is slowing down, the physicist experiences two forces:
The force of gravity pulling him towards the center of the Earth, which is equal to his mass times the acceleration due to gravity, approximately 9.81 m/s^2.
The force of the elevator slowing down, which is equal to his mass times the acceleration of the elevator, which is given as -2.7 m/s^2 in this case (negative because it's in the opposite direction to the physicist's weight).
Therefore, the net force acting on the physicist is:
Net force = Force of gravity + Force of elevator slowing down
= (mass) x (acceleration due to gravity) + (mass) x (acceleration of elevator)
= (99 kg) x (9.81 m/s^2) + (99 kg) x (-2.7 m/s^2)
= 970.19 N - 267.3 N
= 702.89 N
The scale shows the force exerted by the physicist on it, which is equal to the net force acting on the physicist. Therefore, the scale will show:
Scale reading = Net force
= 702.89 N
So, the scale will show a reading of 702.89 N while the physicist is going down in the elevator.
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Related Questions
Dark matter is inferred to exist because Select one: a. we can observe its gravitational influence on visible matter. b. it explains how the expansion of the universe is accelerating. c. we see lots of dark patches in the sky. Clear my choice
Answers
Answer:
(a) the gravitational influence on visible matter can not be explained by matter that can be seen.
Ricardo looked out of a window at his home and saw snow falling on the mountains nearby. He knew that the snow would arrive near his home soon. Ricardo lives in the mountains along the west coast, where the winds blew off the Pacific Ocean. Multiple factors contribute to an area’s climate. Identify three of these factors, and explain how they determine the climate in an area.
Answers
Climate in an area is determined by a complex interplay of factors, including mountains latitude, topography, and atmospheric circulation patterns. Understanding these factors is crucial in predicting weather patterns.
Three factors that contribute to an area's climate are:
1) Latitude: The latitude of an area determines the angle at which the sun's rays hit the earth's surface, which affects the amount of solar energy that is absorbed. Areas near the equator receive more direct sunlight and therefore tend to be warmer, while areas near the poles receive less direct sunlight and tend to be cooler.
2) Topography: The topography of an area, including its elevation and proximity to large bodies of water or mountains, can greatly influence its climate. Areas at high elevations are generally cooler than areas at lower elevations, and areas near large bodies of water tend to have milder temperatures due to the moderating effect of the water. Mountains can also influence climate by blocking or redirecting prevailing winds, leading to variations in temperature and precipitation.
3) Atmospheric circulation patterns: The movement of air masses and weather systems around the globe is driven by a complex interplay of factors, including temperature, pressure, and the rotation of the earth. These circulation patterns can greatly affect the climate of an area by determining the direction and intensity of winds, the amount of precipitation, and the frequency and severity of storms.
In Ricardo's case, the climate in his area is likely influenced by all three of these factors. The latitude of his location along the west coast of the mountains will determine the angle at which the sun's rays hit the earth's surface and thus the amount of solar energy absorbed. The topography of the area will also play a role in determining the temperature and precipitation patterns, as well as the effect of ocean winds blowing from the Pacific. Finally, atmospheric circulation patterns will determine the direction and intensity of winds and the frequency and severity of storms that pass through the area.
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A friend says to you, “I’m the fastest runner in my class because I can run four miles without stopping.” Explain to your friend why her statement doesn’t make sense.
Answers
Answer:
Just because they can run doesn't mean they are fast
Explanation:
you could take a day to run across a football field, or you can take 5 minutes, which is faster?
You're friend in this equation has little to no braincells so they would have trouble seeing that running the length of a football field in five minutes is faster than a day, however, if they also said they did it in less than five minutes then it would mean your friend is fast
A spring stores 12 J when it is stretched by 16 cm. Calculate the spring constant.
Answers
\(\\ \rm\rightarrowtail W=Fx\)
\(\\ \rm\rightarrowtail 12=1.6F\)
\(\\ \rm\rightarrowtail F=7.5N\)
Now
\(\\ \rm\rightarrowtail F=-Kx\)
\(\\ \rm\rightarrowtail 7.5=-1.6k\)
\(\\ \rm\rightarrowtail k=-4.68N/m\)
a subwoofer is a type of speaker which plays only the very low notes in a song or movie, which following frequencies would you expect to be able to hear from a subwoofer
10hz
25hz
750hz
1,050hz
Answers
Answer:
25z
Explanation:
interior crocodile alligator i drive a chevrolet movie theater
Answers
Answer:
nah bro tesla
Explanation:
How much energy is required to change a 0.04 kg ice cube from ice at –10°C to water at 80°C?
Answers
Answer:
3.2kcal
Explanation:
ΔQ = 0.04 kg*(0.49 kcal/(kgoC))*10 oC = 0.196 kcal. ΔQ = 0.04 kg*80 kcal/kg = 3.2 kcal.
Two 10-cm-diameter charged rings face each other, 24.0 cm apart. both rings are charged to 20.0 nc . what is the electric field strength?
Answers
E = k * (Q / r²). Where E is the electric field intensity, k is the Coulomb's constant (9 x 10⁹ N ), Q is one of the rings' charges, and r is the distance between their centres. The electric field strength is 3125 N/C.
Thus, the distance between the centres of the two rings is r = 24.0 cm, and both rings have the same charge, Q = 20.0 nC.
Transforming the charge from nano Coulombs to Coulombs first Q = 20.0 nC = 20.0 x 10⁹ C
The strength of the electric field:
E = [(20.0 x 10-⁹ C) / (24.0 x 10-2 m)] * [(9 x 10 ⁹)
E = (9 x 10⁹ ) * (20.0 x 10⁹) / (0.24)
E = (9 x 10⁹) * (20.0 x 10⁹ C) / 0.0576
E ≈ 3125 N/C.
Thus, E = k * (Q / r²). Where E is the electric field intensity, k is the Coulomb's constant (9 x 10⁹ N ), Q is one of the rings' charges, and r is the distance between their centres. The electric field strength is 3125 N/C.
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PLEASE HELP!!!! i will give brainliest to the first person...
Answers
Answer: Fossil fuels power the machine that shakes the tree so the apples fall to the ground
Explanation: most machines are powered by fossil fuels
Can somebody explain to me what’s 1/d^2 in electric force? And how do I graph it versus a force?
Answers
Answer:
so basically what you gotta do is, and then you can do that but you shouldn't do this
Net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9. 8m/s^2 comes out to be:(a) 980N(b) 580N(c) 1380N(d) zero
Answers
Answer:
(d) zero
Explanation:
Net acceleration = (a - g)
a is downward so it is positive
F(net) = ma(net)
F = 100 x (9.8 - 9.8)
F = 0
The correct option is (d).
Why does eating less meat conserve more water than just eating plants?
Answers
Answer:
Studies show that eating fewer animal-based products could reduce water use since animal production uses more water than crops do. In addition, reducing the amount of food that's lost or wasted at various points in the food supply chain could feed about 1 billion extra people while simultaneously reducing water use.
Every food and beverage product we consume: from soda to pineapples to cheese crackers and pork chops, etc. requires water for its production. Obviously, fruits and veggies need water. That’s a given, but surprisingly, there is another group of foods that is the biggest water guzzler of them all and that is animal products. Meat, dairy, and eggs require more water to “produce” than any other food out there.
A baseball player hits a 0. 15 kg 0. 15kg0, point, 15, start text, k, g, end text baseball that is initially at rest, changing its momentum by 11 kg ⋅ m s 11 s kg⋅m 11, start fraction, start text, k, g, end text, dot, start text, m, end text, divided by, start text, s, end text, end fraction
Answers
The velocity of baseball that was initially at restand changing momentum by 11 kgm/s is 73.3m/s.
How to calculate velocity?We can find the velocity of the player.
Momentum = mass * velocity
Given
Mass = 0.15kg
Momentum = 11kgm/s
Get the velocity
Velocity = Momentum/Mass
Velocity = 11/0.15
Velocity = 73.3m/s
Hence the velocity of the player is 73.3m/s
What is velocity?The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity.What is momentum?Momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.For more information on momentum kindly visit to
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TRUE/FALSE. the engine of an aircraft propeller delivers an amount of power 171 hphp to the propeller at a rotational velocity of 2410 rev/minrev/min.
Answers
The engine of an aircraft propeller delivers an amount of power 171 hp to the propeller at a rotational velocity of 2410 rev/min. This is a false statement.
What is power?
Power can be defined as the amount of work completed in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.
With out knowing mass of the propeller, it can't be concluded about its rotational velocity - no mater how much power is applied on it.
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A material that does not conduct heat very well
A
Expander
B
Radiation
C
Conductor
D
Insulator
Answers
Answer:
D
Explanation:
Insulator is like rubber, it cant physically hold heat well
Can acceleration and velocity be equal vectors?
Answers
Answer:
Velocity is the rate of change of position with respect to time, whereas acceleration is the rate of change of velocity. Both are vector quantities (and so also have a specified direction), but the units of velocity are meters per second while the units of acceleration are meters per second squared.
Science
Eighth grade D.1 Calculate density, mass, and volume 9BL
Submit
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Olive oil in a bottle has a mass of 690 grams and a volume of 750 cubic centimeters.
Calculate its density.
Write your answer to the hundredths place.
grams per cubic centimeter
Answers
The density of the of the olive oil, given that it has a mass of 690 grams and a volume of 750 cm³ is 0.92 g/cm³
How do I determine density of the olive oil?We know that density is defined as mass per unit volume. It is expressed as:
Density = mass / volume
Thus, with the above formula, we can determine the density of the oliver oil as illustrated below:
Mass of olive oil = 690 gVolume of olive oil = 750 cm³ Density of olive oil = ?Density = mass / volume
Density of olive oil = 690 / 750
Density of olive oil = 0.92 g/cm³
Therefore, we can conclude that the density of the olive oil is 0.92 g/cm³
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PLS HELP WILL AWARD BRAINLIEST ITS TIMES
Dave slides across a soccer field to try to kick a ball. He comes to a stop
because of friction. Which free-body diagram shows him while he is sliding?
a
b
c
d
Answers
Answer:
C
Explanation:
Mg points down. The Normal force
F
N
is exactly equal to mg and points up. Friction opposes motion so assuming he slides to the right, the friction force will point left.
Sorry if its wrong
The free-body diagram in diagram C shows Dave while he is sliding.
What is frictional force?Two surfaces that come into contact and glide against one another produce frictional force.
The following variables impact the frictional force:
Surface roughness and the amount of force pressing them together have the biggest an impact on these forces.The amount of frictional force is influenced by the object's position and angle.The frictional force will be equal to the object's weight if it is pressed flat against another object.Hence, the weight of Dave acts downwards and normal force on Dave acts upwards and frictional force acts opposite to the motion of him. Diagram c shows this.
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how many times greater is the intensity of the sound from a 1.0 t mri scanner compared to the intensity of the sound from a vacuum cleaner?
Answers
The noise from a 1.0 t mri scanner is five times more intense than the noise from a vacuum cleaner. Intensity of sound is measured as the quantity of sound per unit of perpendicular space.
W/m2, the SI unit for sound intensity, indicates I, the direction in which sound waves travel (watt per square meter). Sound intensity is often measured in Watts per square metre (W/m2). In order to determine how much sound energy a certain amount of noise emits in the air where the listener is standing, the standard definition incorporates calculation. The relative intensities of two sounds stated in bels are what the logarithm of the intensity ratio equals as a result.
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5. Whether you are standing, running or jumping Earth is exerting a gravitational force on you. This gravitational force is called an object's weight (W). Knowing this you can find the weight of an object if you know the mass because the acceleration will be 9.8 m/s2 due to gravities pull on the object. The equation to use then is: W = mass x acceleration. What is the weight of a 53 kg man?
Answers
Answer:
How we know, the equation is:
W = mg
Replacing according our data:
W = 53 kg × 9,8 m/s^2
Resolving:
W = 519,4 N
The weight of the object is of 519,4 Newtons.
the types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are group of answer choices none of these. dc and ac, respectively. ac and dc, respectively. both ac. both dc.
Answers
The types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are AC and DC, respectively.
When we consider the types of current carried by the headlights of an automobile and by a plug-in toaster in your kitchen, the current is different. The headlights of an automobile use DC or Direct Current. The battery is the primary source of energy in a vehicle. As a result, direct current is used. AC or Alternating Current is used by a plug-in toaster in your kitchen.
An electric current that alternates in polarity, switching directions at regular intervals, is known as alternating current. Alternating current (AC) is a type of current that changes direction on a regular basis. It alternates in polarity from a positive charge to a negative charge. The voltage in alternating current increases and decreases periodically.
AC power is generated, transmitted, and distributed because it can be modified with transformers to alter the voltage and current levels. The use of DC or AC is determined by the application. The use of DC or Direct Current is ideal for applications that require constant voltage and current supply, such as lighting and electronic devices.
Alternating current is suitable for power transmission and distribution because it can be easily transformed from one voltage level to another. So, the answer is ac and dc, respectively.
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A marble has a volume of 1 mL. How much water will it displace in a graduated cyclinder
A.
1 mm
B.
more than 1 mL
C.
less than 1 mL
D.
1mL
Answers
A measure of the output produced per unit of an input is called
total product
average product
marginal product
indifference curve
Answers
The measure of the output produced per unit of an input is called "marginal product."
In economics, the concept of marginal product refers to the additional output that is generated by increasing the quantity of a particular input while keeping all other inputs constant.
It is calculated by dividing the change in total output by the change in the quantity of the input. Marginal product helps us understand the rate of change in production as inputs are increased or decreased.
For example, let's consider a factory that produces widgets. If the factory hires an additional worker and experiences an increase in output, the marginal product of that worker would be the additional number of widgets produced due to their contribution.
The concept of marginal product is essential for firms to determine the optimal level of input usage, as it helps them evaluate the productivity of each additional unit of input and make informed decisions regarding resource allocation.
In summary, the measure of output produced per unit of input is referred to as the marginal product, which helps assess the incremental productivity gained from additional units of input in a production process.
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A battery-powered set of five patio lanterns is connected in series. An ammeter measures the current through the battery as 0.75 A. The total resistance of the circuit is 52 0. (a) Calculate the voltage drop across the battery. (b) Calculate the voltage drop across each load.
Answers
(a) 39 V
(b) 7.8 V
Explanation:(a) Neglecting the internal resistance of the battery, the voltage drop (V) across the battery is found from Ohm's law as follows;
V = IR -------------------------(i)
Where;
I = current through the battery
R = total resistance of the circuit.
From the question;
I = 0.75A
R = 52.0Ω
Substitute the values of I and R into equation (i)
=> V = 0.75 x 52.0
=> V = 39Volts
Therefore, the voltage drop across the battery is 39 Volts
(b) Since the set of lanterns is connected in series, then the same current flows through each of the lanterns. Also, since the lanterns are identical, the resistance (\(R_{L}\)) of each of them is given by the total resistance (R = 52.0Ω) divided by the number of lanterns. i.e
\(R_{L}\) = \(\frac{52.0}{5}\)
\(R_{L}\) = 10.4Ω [Each lantern has a resistance of 10.4Ω]
The current flowing through them is the same as the current (I = 0.75A) flowing the circuit.
Therefore, using Ohm's law, the voltage drop (\(V_L\))across each load (lantern) is
\(V_L\) = I x \(R_{L}\)
\(V_L\) = 0.75 x 10.4
\(V_L\) = 7.8Volts
Therefore, the voltage drop across each load is 7.8 Volts
If your heart is beating at 76. 0 beats per minute, what is the frequency of your heart's oscillations in hertz?
Answers
If the heart is beating at 76. 0 beats per minute, the Frequency of heart's oscillations in hertz is 1.25 Hertz.
The Frequency is defined as the number of oscillations completed in 1s.
Our heart beats continuously giving rise to the frequency of the heart.
Measuring frequency would be possible if we measure the time in seconds.
75 beats per minute means that 75 beats occur in 60s.
Frequency = Number of beats / Total time taken
Frequency = 75 / 60
Frequency = 1.25 Hz
Hence, number of beats per second is 1.25 Beats.
Beats per second or Cycles per second is same as the frequency of oscillation called as Hertz (Hz)
Hence, frequency of the heart oscillation is 1.25 Hertz (Hz).
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A wave travels through a medium. As the wave passes, the particles of the medium vibrate in a direction perpendicular to the direction of the wave’s motion. The wave is:.
Answers
Answer:
this kind of waves is are called mechanical tranverse examples are surface ripples on water
A soccer player strikes a soccer ball with a force of 550 N. If the player and the ball remain in contact for 0.03 s. What impulse was delivered to the ball by the player?
Answers
Impulse (J) is equal to the change in momentum of the ball. It is also equal to Force times Time:
J = Ft
J = (550 N)(0.03 s)
J = 16.5 Ns
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People living wind farms sometimes object to them because of visual pollution and what other form of pollution?
Answers
Answer:
noise pollution
Explanation:
Visual pollution may be defined as a pollution that obstructs a view. It impairs one ability to see and enjoy a pleasant view. It is considered as an aesthetic issue.
The rotating blades of the windmill causes visual disturbances by intercepting the light of the sun and it causes moving shadows and the light flashes from the reflection of the sun. It also causes noise or sound as the blades rotates. Thus the combination of visual and acoustics exposures leads to the negative assessment of the windmills.
Therefore, people living near wind farms objects the windmills as they causes visual pollution as well as noise pollution.
A 7 kg suitcase and a 12 kg suitcase are dropped from the same second story window at the same time. If there is no wind resistance, which of the following sentences is true?
Select one:
a. The 7 kg suitcase will hit the ground first.
b. The 12 kg suitcase will hit the ground first.
c. The suitcases will hit the ground at the same time.
d. It is impossible to predict what will happen
Answers
Explanation:
the correct answer is C.
if there is no wind resistance; in vaccum both will hit the ground at the same time.
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Which of the following equations describes how voltage (V), current (I), and
resistance (R) are related?
A. V= IR
B. R= I/ V
C. R= VI
D. V= I/ R
Answers
Answer:The answer is B: RI/V
Explanation: Because V is divided by I and multiplied by R