A person is riding an elevator downward at a constant speed. compare using full sentences the amount of force acting upward on the person to the amount of force acting downward on the person
Answers
Net Force = ma - mg
Net Force = m(a - g)
where
m is the mass of the body
a is the acceleration of the elevator
g is the acceleration due to gravity equal to 9.81 m/s²
Related Questions
If mechanical energy is conserved, then a pendulum that has a potential energy of 20 J at its highest point and 0.5 J at its lowest point has _____ as its kinetic energy at its lowest point.
20 J
0.5 J
19.5 J
20.5 J
Answers
So the total mechanical energy is 20
Assume no frictions present, then the mechanical energy is conserved
So at the lowest point, kinetic energy = mechanical energy - potential energy
Answer will be 20 - 0.5 = 19.5 J
Answer:
The third answer is correct:)
Explanation:
How much work does the up escalator do on you when you ride it from the lower level to the upper level?
Answers
A=Ep2-Ep1
A=mgH2-mgH1
A=mg(H2-H1)
Are all neon lights made up of neon gases
Answers
goodluck my friend :-)
How much work is done when a 185 g tomato is lifted 17.9 m ?
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The work done when lifting a 185 g tomato by 17.9 m is approximately 32.5 joules, calculated using the weight of the tomato as the force and the distance it is lifted.
Explanation:To calculate the work done when lifting an object, we can use the formula Work (W) = Force (F) × Distance (D) × cos(θ), where θ is the angle between the force and the displacement. In the case of lifting an object vertically, the angle is 0°, so the cosine term is 1, and the equation simplifies to W = F × D. For a 185 g tomato lifted 17.9 m, we first need to convert the mass of the tomato to kilograms by dividing by 1000, which gives us 0.185 kg. The force is equal to the weight of the tomato, which is the mass (m) multiplied by the acceleration due to gravity (g = 9.8 m/s²), F = m × g. Thus, the force is F = 0.185 kg × 9.8 m/s² = 1.813 N. The work done is then W = 1.813 N × 17.9 m = 32.463 J, which we round to 32.5 J when expressing it with three significant figures.
While standing near a bus stop, a student hears a distant horn beeping. The frequency emitted by the horn is 440 Hz. The bus is traveling at 20.0 m/s, and the speed of sound is 330 m/s. What frequency will the student hear at each point in the bus's motion?
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
B. 415 Hz while approaching, 440 Hz through the crossing, 468 Hz while receding
C. 440 Hz while approaching, 415 Hz through the crossing, 400 Hz while receding
D. 505 Hz while approaching, 440 Hz through the crossing, 438 Hz while receding
Answers
Answer:
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
Explanation:
When bus is approaching the stand where boy is standing then the frequency is given as
now we know that
[tex]f_0 = 440 Hz[/tex]
[tex]v = 330 m/s[/tex]
[tex]v_b = 20 m/s[/tex]
frequency is given by
[tex]f_1 = f_0 \frac{v}{v - v_b}[/tex]
now plug in the data in the equation
[tex]f_1 = 440 \times \frac{330}{330 - 20}[/tex]
[tex]f_1 = 468 Hz[/tex]
Now when bus is moving away from the bus stop then frequency is given as
[tex]f_2 = f_0 \frac{v}{v + v_b}[/tex]
[tex]f_2 = 440 \times \frac{330}{330 + 20}[/tex]
[tex]f_2 = 415 Hz[/tex]
so here correct answer would be
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
What process is used when electrons are transferred from one object to another to produce static electricity?
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PLEASE HELP NOW!! Which of the following must be the same for two isotopes of an element?
A. The number of neutrons
B. The atomic number
C. The mass
D. The charge
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<<<<<<<<<< B is the answer >>>>>>>
Moving your finger across a textured surface can produce vibrations that are interpreted as texture. these vibrations are defined as _____.
a. temporal cues
b. parietal cues
c. spatial cues
d. olfactory cues
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temporal cues is a form of vibrations that will be temporally stored in your brain before it processed.
Temporal cues is very important during speech recognition process and during identifying process of an object
The. Is the time it takes for a wave to complete one cycle
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Answer:
Time period
Explanation:
The time taken by a wave to complete one cycle is called the time period of a wave. It is denoted by T. The number of vibration per second is called the frequency of the wave.
The relation between the time period and the frequency is inverse i.e.
[tex]T=\dfrac{1}{\nu}[/tex]
If the number of vibrations increases its time period will decrease.
Similarly, for a simple pendulum the time period to complete one cycle is :
[tex]T=2\pi\sqrt{\dfrac{l}{g}}[/tex]
l and g are length of pendulum and acceleration due to gravity.
When you drop a sugar cube in a glass of water, at first the water doesnât taste sweet. later, it tastes very sweet.what causes the change in the waterâs taste?
Answers
In terms of energy, think about what happens when you eat a hot meal. Describe all the different forms of energy that you experience. For example, if you are eating under a lamp, its electromagnetic energy helps you see the food. Explain the source of each form of energy.
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Why do you lurch forward in a bus that suddenly slows? why do you lurch backward when it picks up speed? what law applies here?
Answers
This law states that: A body will retain its state of rest or motion unless acted upon by an external force.
If you are moving and the bus suddenly stops, your body will lurch forward trying to retain its state of motion until it comes to rest and changes its state by the external force acted on it.
If you are at rest and the bus suddenly moves, your body will lurch backwards trying to retain its state of rest and opposing the force of motion until it is forced to change its state by this force.
Final answer:
You lurch forward in a bus that suddenly slows due to Newton's First Law of Motion, or the law of inertia, which suggests an object in motion stays in motion unless acted on by an unbalanced force. When the bus accelerates, inertia causes you to feel pushed back as your body prefers to remain at rest. Understanding this law helps in recognizing the importance of safety measures like seatbelts.
Explanation:
Understanding Movement in a Bus: Newton's First Law of Motion
When a bus suddenly slows down, you lurch forward because of Newton's First Law of Motion, also known as the law of inertia. This law states that an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Since your body wants to keep moving at the same speed the bus was going before it slowed down, you lurch forward when the bus decelerates.
Similarly, when the bus speeds up, you might feel like you are being pushed back into your seat. This is again due to the law of inertia. Your body wants to remain at its state of rest (or moving at a constant speed if the bus was already moving), so when the bus accelerates, it creates a temporary imbalance, making you feel pushed back.
Using seatbelts or holding onto something stable inside the bus can counteract these effects by providing the necessary force to keep you in place, thereby preventing injury and ensuring safety.
Why Understanding Newton's First Law is Important
The applications of Newton's First Law are seen in everyday life, not just in theoretical physics. It explains a wide range of phenomena, from why it's crucial to wear a seatbelt to the importance of headrests in preventing whiplash injuries. Understanding these principles can help improve personal safety and awareness in moving vehicles.
Determine the density of a rectangular piece of concrete that measures 3.7 cm by 2.1 cm by 5.8 cm and has a mass of 43.8 grams.
Answers
Calculate the volume of the concrete.
V = 3.7*2.1*5.8 cm³ = 45.066 cm³ = 45.066 x 10 ⁻⁶ m³
The mass is 43.8 g = 43.8 x 10⁻³ kg
The density is mass/volume.
Density = (43.8 x 10⁻³ kg)/(45.066 x 10⁻⁶ m³) = 971.9 kg/m³
Answer: 971.9 kg/m³
The density of the concrete is approximately 0.965 g/cm³. The result does not support the statement that rebar is mostly iron.
Explanation:The density of a substance can be calculated by dividing its mass by its volume. In this case, the mass of the concrete is 43.8 grams and the volume is calculated by multiplying the length, width, and height, which is 3.7 cm x 2.1 cm x 5.8 cm = 45.4014 cm³ (rounded to the nearest 0.0001 cm³). Therefore, the density of the concrete is 43.8 g / 45.4014 cm³ ≈ 0.965 g/cm³.
(b) Since the density of the concrete in (a) is less than the density of iron (approximately 7.87 g/cm³), the result does not support the statement that rebar is mostly iron.
A car accelerates from rest at a constant rate of 2m/s2 for 5s. what is the speed of a car at the end of that time?
Answers
We have:
[tex]\mathsf{V_0 = 0}\\ \mathsf{a = 2 \ m/s^2}\\ \mathsf{t = 5 \ s} [/tex]
The function of velocity:
[tex]\mathsf{V = V_0+at}\\ \\ \mathsf{V = 0 + 2t}\\ \\ \mathsf{V = 2t}[/tex]
For t = 5 s:
[tex]\mathsf{V = 2\cdot 5}\\ \\ \boxed{\mathsf{V = 10 \ m/s}}[/tex]
What will most likely occur if sulfur forms an ionic bond with another element?
Answers
A boy yells in a narrow valley. The sound reflects off of a boulder that is 80 m away. How long will it take to hear the echo if the speed of a sound wave is 320 m/s?
Answers
Answer:
0.50 s
Explanation:
you're welcome
Only a _______ technician may wear the ASE insignia on his or her uniform. A. full-time B. certified C. qualified D. dues-paying
Answers
Doesn't it seem right to add that in the answer?
Answer:
B. Certified
Explanation: I agree with the other person and i also believe it is correct
Which one of the following does not accurately describe the universal gravitational law? A. Gravitational force is proportional to the square of the distance between the centers of both bodies. B. The object with the smaller mass does most of the moving because the object with the larger mass has too much inertia to move any noticeable amount. C. Gravitational force is proportional to the product of the two masses. D. Every object in the universe that has mass attracts every other object in the universe that has mass.
Answers
FALSE:
Gravitational force is inversely proportional to the square of the distance between the centers of both bodies.
Which you can see from the formula: F = G * [m*M] /(d^2)
As you see in the equation, d^2 is in the denominator so the bigger d^2 (the square of the distance between the centers) of the objects the smaller the gravitational force.
B. The object with the smaller mass does most of the moving because the object with the larger mass has too much inertia to move any noticeable amount.
TRUE:
F = mass * acceleration => acceleration = F / mass => the larger the mass the smaller the acceleration.
C. Gravitational force is proportional to the product of the two masses.
TRUE:
F = G [m*M] / (d^2)
The product of the two masses, m*M, is in the numerator, so F is proportional to this product.
D. Every object in the universe that has mass attracts every other object in the universe that has mass.
TRUE: that is a Universal Law discovered by Sir Isaac Newton.
In a collision, the __________ collision is when an unsecured driver strikes the inside of the vehicle.
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Answer:
In a collision, the SECOND collision is when an unsecured driver strikes the inside of the vehicle.
Explanation:
When driver in the car is unsecured then it means that the driver is not having his safety seat belt.
Now when collision occurs between the car and some other object then due to the property of inertia of driver it has tendency to move in the direction of his motion.
So the driver will continue his motion and collide with other parts of the car and due to this he may got injured.
So in any car collision there are two types of collision
first is the collision of car with other objects
second collision is between car and the driver inside the car
the contribution of Tycho Brahe was primarily his
calculations
observation
inventions
theories
Answers
Answer: B ) observation.
Ptolemy's model was __________, with the earth fixed in the center of the universe.
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In the earlier day before heliocentric found, many people believe that earth is the core of the galaxy. That means the other planet and the sun are moving around it. This theory was already proven wrong and the theory is now changed into heliocentric which state the sun is the center of the galaxy.
Liz rushes down onto a subway platform to find her train already departing. she stops and watches the cars go by. each car is 8.60 m long. the first moves past her in 1.80 s and the second in 1.66 s. find the constant acceleration of the train.
Answers
The average velocity can be calculated using the formula:
v = d / t
For the 1st car, the velocity is calculated as:
v1 = 8.60 m / 1.80 s = 4.78 m / s
While that of the 2nd car is:
v2 = 8.60 m / 1.66 s = 5.18 m / s
Now we can solve for the acceleration using the formula:
v2^2 = v1^2 + 2 a d
Rewriting in terms of a:
a = (v2^2 – v1^2) / 2 d
a = (5.18^2 – 4.78^2) / (2 * 8.6)
a = 0.23 m/s
Therefore the train has a constant acceleration of about 0.23 meters per second.
The angular speed of the minute hand of a watch is:
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-- one revolution per hour
-- 2 pi radians per hour
-- 360 degrees per hour
-- 6 degrees per minute
-- 0.1 degree per second
The angular speed of the minute hand of a watch is calculated by dividing the total angle of rotation (2π rad) by the period of rotation (3600 s), which equals 0.1047 rad/min. This indicates the degree of the minute hand's rotation per minute. The right-hand rule also designates the angular velocity's direction.
Explanation:The angular speed of the minute hand of a watch refers to the degree of rotation of the minute hand per unit of time. In the particular case of a watch, the minute hand completes one full revolution (360° or 2π rad) in one hour (60 minutes or 3600 seconds). Therefore, the angular speed ω can be calculated as the total angle of rotation (2π rad) divided by the period of rotation, which is 3600 seconds.
Thus, the angular speed is calculated as ω = 2π rad/3600 s. By converting this to radian per minute, which is a more typical unit for a watch, we obtain that the angular speed of the minute hand of a watch is 0.1047 rad/min. This means that in each minute, the minute hand rotates 0.1047 radians.
This concept and calculation is part of what's studied in rotational motion in physics, where the right-hand rule can also be used to determine the direction of the angular velocity vector.
Learn more about Angular Speed here:https://brainly.com/question/32114693
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Describe at least 2 resources (i.e. places, people, books, etc.) that can help you to maintain the life of your car.
Answers
In order to maintain the life of your car the following resources are important:
1. Oil
Changing the oil every 3000 miles is essential for your engine and so for the life of your car.
2. Places
Driving your car on good roads (roads suitable for the type of car) will also maintain your car's performance and extend its life.
3. Regarding people as a resource, checking your car regular at auto mechanics.
How do scientists determine the age of the solar system?
Answers
A magnetic field applies forces on:
a.static charges
b.moving charges
c.water flow
Answers
By definition, F = qvB, where q is the charge of the particle, v is the velocity, and B is the field intensity.
Therefore, the particle must be of moving charge.
Answer:
its b on oddessey ware
Explanation:
You push forward on a car with a force of 150 N, but the car does not move. What is the net force on the car?
Answers
Bob is pushing a lawn mower up a hill with the mower tilting slightly to the right. suppose that we wish to use vectors to determine the total force acting on the mower. what forces should be considered?
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Answer:
Applied force, weight, normal force and frictional force
Explanation:
Bob is pushing a lawn mower up a hill with the mower tilting slightly to the right. We have to write the forces acting on the mower.
The following are the forces that are acting on the mower.
1. Applied force - The force with which Bob is pushing a lawn.
2. Weight - Its weight is equal to, W = m g
3. Normal force - that balances its weight
4. Frictional force - It always opposes the motion of the mower.
Hence, this is the required solution.
The lawn mower is acted upon by four different forces.
Vector quantities are those quantities that posses both magnitude and direction. Force is a vector quantity. Hence, the resultant force acting on a lawn mover can be obtained as the resultant of the four forces that act on the mower.
The four forces that act on the lawn mower are;
Applied forceFrictional forceWeight of the mowerNormal reactionHence, the lawn mower is acted upon by four different forces.
Learn more about forces: https://brainly.com/question/26115859
A ball thrown with 50N of force accelerates at 25 m/s2. What is the mass of the ball?
Answers
Force is 50N. Acceleration is 25 m/s^2.
50N=m*25 m/s^2
Divide both sides by 25.
mass=2 kg
What is the half-reaction that occurs at the cathode during the electrolysis of molten potassium bromide?
Answers
Final answer:
During the electrolysis of molten potassium bromide, the half-reaction that occurs at the cathode is the reduction of potassium ions (K+) to form potassium metal (K).
Explanation:
The half-reaction that occurs at the cathode during the electrolysis of molten potassium bromide is the reduction of potassium ions (K+) to form potassium metal (K).
The half-reaction can be represented as:
2K+ + 2e- -> 2K
At the cathode, positive ions are reduced and gain electrons to form neutral atoms or molecules.