The cable lifting an elevator is wrapped around a 1.1m diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 2.6 ms. It then slows to a stop, while the cylinder turns one complete revolution. How long does it take for the elevator to stop? Express your answer to two significant figures and include the appropriate units.
Answers
Answer:
t = 2.7 s
Explanation:
This is a kinematics problem.
How the elevator reduces its speed to zero by a distance equal to the length of the cylinder
y = 2π r = 2 π d / 2
y = π d
y = π 1.1
y = 3,456 m
now we can look for the acceleration of the system
v² = v₀² - 2 a y
0 = v₀² - 2 a y
a = v₀² / 2y
a = 2.6² / 2 3.456
a = 0.978 m / s²
now let's calculate the time
v = v₀ - a t
0 = v₀ - at
t = v₀ / a
t = 2.6 /0.978
t = 2.658 s
ask for the result with two significant figures
t = 2.7 s
Related Questions
ANSWER THIS! Which of these statements about the Sun is the result of its closeness to Earth? A) It is the only star with a gravitational pull. B) It is the largest star in the Milky Way Galaxy. C) It appears (from Earth) to be the brightest star. D) It has the lowest temperature of any star seen from Earth.
Answers
Answer:
C) It appears (from Earth) to be the brightest star.
Explanation:
This is because due to sun's brightness we can predict its distance.
Given the following information, what is the magnitude of the sum of the three
vectors?
Vector A: [13, 8, 0]
Vector B: [13, 0, 8]
Vector C: [0, 1, 8]
Express your answer to two decimals
Answers
Answer:
31.84
Explanation:
To find the magnitude of the sum of the three vectors, first, we need to add the vectors component-wise. Then, we can find the magnitude of the resulting vector.
Add the vectors component-wise:
Vector A + Vector B + Vector C = [13+13+0, 8+0+1, 0+8+8] = [26, 9, 16]
Find the magnitude of the resulting vector:
The magnitude of a vector [x, y, z] is given by the formula:
magnitude = sqrt(x^2 + y^2 + z^2)
Plugging in the values from the resulting vector:
magnitude = sqrt(26^2 + 9^2 + 16^2)
magnitude = sqrt(676 + 81 + 256)
magnitude = sqrt(1013)
magnitude ≈ 31.84
The magnitude of the sum of the three vectors is approximately 31.84.
Hope this helps!
electric heater has a power of 50 watts calculate the time taken for the electric element to transfer 4750 joules of energy to the vegetable oil
Answers
Answer:
3000 seconds
Explanation:
how much time would it take for the sound of thunder to travel 1,500 meters if sound travels at a speed of 330m/s
Answers
Answer:
4.545454 seconds
Explanation:
1500/330=4.545454 seconds
Answer:
4.5
Explanation:
the whole number 4.54 repeating
Two point charges are located on the y-axis as follows: one charge q1 = -1.95 nC located at y= -0.550 m, and a second charge q2 = 3.60 nC at the origin (y=0). What is the magnitude of the total force exerted by these two charges on a third charge q3 = 4.90 nC located at y3 = -0.435 m ?
Answers
Given :
Three charges :
\(q_1=-1.95\ nC\\\\q_2=3.60\ nC\\\\q_3=4.90\ nC\)
There location on y-axis :
\(y_1=-0.550\ m\\\\y_2=0\ m\\\\y_3=-0.435\ m\)
To Find :
Total force acting on \(q_3\) .
Solution :
Total force acting on \(q_3\) is :
\(F_3=\dfrac{kq_1}{r_1^2}+\dfrac{kq_2}{r_2^2}\\\\F_3=k[(\dfrac{1.95\times 10^{-9}}{0.550-0.435})+(\dfrac{3.6\times 10^{-9}}{0.550-0})]\\\\F_3=9.0 \times 10^9 \times [(\dfrac{1.95\times 10^{-9}}{0.550-0.435})+(\dfrac{3.6\times 10^{-9}}{0.550-0})]\\\\F_3=211.52\ N\)
Therefore , force applied on \(q_3\) is 211.52 N .
Hi
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When two light bulbs are connected in series, the resistance in the circuit is increase compared to that with one lightbulb. The increased resistance opposes the flow of current so far fewer electrons pass per second , transferring less energy. The lightbulbs are therefore not as bright as In a circuit with same voltage but only one bulb.
However, when Two lightbulbs are connected in parallel, each loop behaves like a separate circuit . The resistance in each branch is the same as if there were just one light bulb in the whole circuit.there is the same current in each branch of the circuit ,so the bulbs Will light up with the same brightness as a single bulb circuit. The energy stored in the battery will decrease twice as quickly and battery will run out faster than I series circuit.
6) explain the advantages and disadvantages of arranging components in series or parallel.
Answers
Advantages of Components Arranged in Series:
1. Increased resistance: Connecting components in series increases the overall resistance in the circuit. This can be advantageous in situations where you want to limit the flow of current or control the amount of power being dissipated.
2. Voltage sharing: In a series circuit, the total voltage of the power supply is divided among the components. This can be useful when you want to ensure that each component receives a specific voltage.
3. Current consistency: The current remains the same throughout the series circuit, which can be beneficial when you need to ensure a consistent current flow through multiple components.
Disadvantages of Components Arranged in Series:
1. Reduced brightness or performance: As mentioned in the question, when light bulbs are connected in series, the increased resistance reduces the flow of current, resulting in dimmer bulbs or reduced performance in other electrical devices.
2. Single point of failure: If one component in a series circuit fails, it can disrupt the entire circuit and cause all components to stop functioning.
Advantages of Components Arranged in Parallel:
1. Brightness and performance: When components such as light bulbs are connected in parallel, each component receives the full voltage, resulting in brighter bulbs and better performance in other devices.
2. Redundancy: In a parallel circuit, if one component fails, the other components can continue to function independently. This provides redundancy and ensures that the failure of one component does not affect the others.
3. Increased current capacity: Parallel arrangement allows the circuit to handle higher currents, which can be useful in situations where high power or heavy loads are required.
Disadvantages of Components Arranged in Parallel:
1. Increased complexity: Parallel circuits require more wiring and connections, which can make the circuit more complex and harder to manage.
2. Higher cost: Parallel circuits may require more components and wiring, resulting in higher costs for materials and installation.
It's important to consider the specific requirements and constraints of the application when deciding whether to arrange components in series or parallel. Each configuration has its advantages and disadvantages, and the choice depends on factors such as desired current flow, voltage distribution, and reliability.I
In a scientific graph, an outlier...
*
1 point
a. is included in the best-fit line or curve.
b. represents an error in the experiment.
c. is not included in the best-fit line or curve.
d. both b and c.
Answers
Option d: An outlier in a scientific graph represents an inaccuracy in the experiment. is not a part of the best-fit line or curve.
An experiment is a systematic process of testing a hypothesis or verifying a theory. It is a fundamental part of the scientific method, which involves making observations, gathering data, and analyzing results to draw conclusions. Experiments can be performed in a wide range of fields, from physics and chemistry to biology and psychology.
The design of an experiment is crucial in ensuring reliable results. It involves defining the variables, selecting the appropriate measurements and instruments, and establishing a control group to eliminate confounding factors. Proper documentation and communication of experimental procedures and results are also important for the scientific community to evaluate and replicate the study.
Experiments can have numerous applications, including developing new technologies, testing the efficacy of medications, and exploring the natural world. They can also lead to unexpected discoveries, challenge existing theories, and provide insights into the underlying mechanisms of natural phenomena. Overall, experiments play a vital role in advancing scientific knowledge and improving our understanding of the world around us.
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prove the identity
Trigonometry grade 10
Answers
Answer:
and is in photo given.I didn't get time to type.
The anomalous expansion characteristics of liquid water are crucial to many biological systems. Rather than an approximately constant value for the coefficient of volume expansion, the value for water changes drastically, as illustrated in the figure.
Below what temperature T
does water shrink when heated?
If the temperature of water at 30 ∘C
is raised by 1 ∘C
, the water will expand. At approximately what initial temperature T
will water expand by twice as much when raised by 1 ∘C
?
Answers
(A) The water will shrink when is heated above 4°C. (B).water at an initial temperature of 33.3°C will be expand by twice as much when it is raised by 1°C compared to water at 30°C.
The anomalous expansion of water refers to the fact that its volume increases upon cooling from 4°C to 0°C, and then contracts upon further cooling to 0°C, and continues to contract upon further cooling. Similarly, when water is heated, its volume first contracts until it reaches 4°C, and then expands upon further heating.
To determine at what temperature water shrinks when heated, we need to find the point at which the coefficient of volume expansion, β, becomes negative. The coefficient of volume expansion is defined as the fractional change in volume per degree Celsius change in temperature, i.e.,
β = (1/V) (dV/dT)
where V is the volume of the water and dV/dT is the rate of change of volume with respect to temperature.
At temperatures below 4°C, the coefficient of volume expansion is positive, indicating that water expands upon heating. However, at temperatures above 4°C, the coefficient of volume expansion becomes negative, indicating that water contracts upon heating.
Therefore, water will shrink when heated above 4°C.
To determine the initial temperature at which water will expand by twice as much when raised by 1°C, we can use the formula for the coefficient of volume expansion:
β = (1/V) (dV/dT)
We want to find the initial temperature T such that
(dV/dT)T = 2 (dV/dT)30
where (dV/dT)T is the rate of change of volume with respect to temperature at temperature T, and (dV/dT)30 is the rate of change of volume with respect to temperature at 30°C.
Using the coefficient of volume expansion for water, we have
β = 3α
where α is the coefficient of linear expansion, which is approximately constant for small temperature changes. Therefore, we can write
(dV/dT) = V × 3α
Substituting this into the equation above and simplifying, we get
T = 30 + 10/3 = 33.3°C
Therefore, water at an initial temperature of 33.3°C will expand by twice as much when raised by 1°C compared to water at 30°C.
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How are the particles in matter organized
Answers
Answer:
Particles in agas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
hope this helps
From a place 400m north of X , a student walks eastwards to a place Y which is 800m from X. What is the bearing of X from Y?
Answers
Answer:
240
Explanation:
We know that Y is 800m from X, and located 400m north of X.
That means the cosine of the bearing of Y from X is 400m/800m = 1/2
We should remember (or use a calculator with arccos) that the angle for which the cosine is 1/2 is 60deg.
The bearing of Y from X is 060.
To get the bearing of X from Y, we just need to add or subtract 180 and we arrive at the answer - 240
a star with 4 times the sun's mass is about 100 times more luminous than the sun. its main sequence lifetime is
Answers
For a star with 4 times the sun's mass is about 100 times more luminous than the sun the main sequence lifetime is 25 times shorter than the Sun's.
What is the sequence lifetime of a star?The sequence lifetime of a star refers to the lifespan of a star celestial body which can be estimated by analyzing the amount of light and mass, in this case, it is equal to 100 / 4 = 25 times shorter than the Sun's.
Therefore, with this data, we can see that the sequence lifetime of a star depends on its light and mass.
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Water flows at a speed of 13 m/s through a pipe that has a diameter of 1.2 m. What is the
diameter of the smaller end of the pipe that the water comes out with a speed of 30 m/s?
Answers
The diameter of the smaller end of the pipe is approximately 0.78 meters.
To determine the diameter of the smaller end of the pipe, we can use the principle of conservation of mass. According to this principle, the mass flow rate of water should remain constant throughout the pipe.
The mass flow rate is given by the equation:
Mass flow rate = density of water * cross-sectional area * velocity
Since the density of the water remains constant, we can write:
Cross-sectional area1 * velocity1 = Cross-sectional area2 * velocity2
Given that the velocity1 is 13 m/s, the diameter1 is 1.2 m, and the velocity2 is 30 m/s, we can solve for the diameter2 using the equation:
(pi * (diameter1/2)^2) * velocity1 = (pi * (diameter2/2)^2) * velocity2
Simplifying the equation:
(1.2/2)^2 * 13 = (diameter2/2)^2 * 30
Calculating the equation:
(0.6)^2 * 13 = (diameter2/2)^2 * 30
0.36 * 13 = (diameter2/2)^2 * 30
4.68 = (diameter2/2)^2 * 30
Dividing both sides by 30:
0.156 = (diameter2/2)^2
Taking the square root of both sides:
0.39 = diameter2/2
Multiplying both sides by 2:
0.78 = diameter2
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A team of engineers is developing a new waterslide for a theme park. The riders of the slide will climb several flights of steps to reach the top of the slide and will sit in a round inner tube as they slide down. The engineers are testing a computer simulation to measure the kinetic energy that the riders will have on the slide. The kinetic energy will be based on the potential, or stored. energy and will depend on mass and speed. The engineers want to develop a way to transfer the most kinetic energy to the riders to make their trip down the slide as fast as possible.
Which of these solutions would increase the kinetic energy in the model slide?
a. adding twists and turns to the slide b.
decreasing the volume of water pushing the riders
C. increasing the friction between the tube and the slide
d. increasing the number of flights of steps that the rider will climb
Please don’t give me a explanation and just give me the answer :)
Answers
The kinetic energy is increased by the number of flights of steps that the rider will climb. The correct option is D.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the stated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes.
Given that the engineers are testing the waterslide for the theme park.
As we can know that kinetic and potential energy are two energies which are converted from one to another. The potential energy is increased by increasing the height of the slide from the ground level.
If the potential energy is higher than the kinetic energy of the slider will also increase during the downward journey.
So by increasing the number of flights of steps that the rider will climb there will be more kinetic energy in the slide. The correct option is D.
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A 750 kg race car accelerates to the right. The engine applies a force of
+7000 N to the car. The total friction on the car in the opposite
direction is -200 N.
Find the net force on the car then use 'Fnet = m a' to find the
acceleration.
O a
b
Oc
Od
12.4 m/s2
10.5 m/s2
8.0 m/s2
9.1 m/s2
Answers
Answer: Option D, 9.1 m/s^2
What wavelength of light (in nm) is associated with a frequency of 5.72 E14 Hz
Answers
Answer: 520 nm; 5.77 × 1014 Hz; 3.82 × 10−19 J
definition of momentum
Answers
Answer:
Momentum is a term used in physics to describe an object's resistance to change its motion. It is a measure of an object's mass and velocity and can be mathematically represented by the equation p = mv, where p is momentum, m is mass, and v is velocity.
Momentum is a vector quantity, meaning it has both magnitude and direction. It can be thought of as the amount of motion an object possesses in a particular direction. For example, a large truck traveling at a high speed has more momentum than a small car traveling at a slower speed, even though they both may have the same mass.
In physics, momentum plays a crucial role in determining how objects will react when they collide. If two objects collide and have equal and opposite momentum, they will typically bounce off each other. However, if one object has much more momentum than the other, it is likely to push the other object aside and continue on its original path.
It is also important to note that momentum is conserved in isolated systems. This means that if two or more objects collide or interact with each other, the total momentum before the collision is equal to the total momentum after the collision.
In conclusion, momentum is a fundamental concept in physics that helps to describe and understand the motion of objects. It is a combination of an object's mass and velocity, and it determines how objects will interact when they collide.
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Jill does twice as much work as Jack does and in half the time. Jill's power output is Group of answer choices one-fourth as much as Jack's power output. four times Jack's power output. twice Jack's power output. one-half as much as Jack's power output. the same as Jack's power output.
Answers
Answer:
Second Choice.
Explanation:
Jack's Power = W/t
Jill's Power = 2W/(0.5)*t
2/0.5 = 4
Jill's Power = 4*W/t
Jill's Power is 4 times greater than Jack's
Second Choice
Explain between the cause of high probability of accidents of loaded vehicles in over speed on the basis of the first law of motion.
Answers
Cause of high probability of accidents of loaded vehicles in over speed effected by momentum on the basis of first law of motion.
What does Newton's first law say?When we are standing inside a bus and it brakes abruptly, due to inertia, we are thrown forward. When a car is going around a curve it is necessary for a force to act, otherwise the car will go in a straight line.
the cause of high probability of accidents of loaded vehicles in over speed occurs large amount of momentum.
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if the box acquires constant acceleration of 2m/s^2 and moves up the ramp by 5m from initial position. calculate work done by kinetic friction
Answers
The work done by force of friction is determined as 27.66 J.
What is the work done by force of friction?To calculate the work done by friction, we need to first find the net force acting on the box.
The force of friction can be calculated using the coefficient of kinetic friction and the normal force:
F_friction = μ_kN
where
μ_k = coefficient of kinetic friction = 0.2
N = normal force = mgcos(θ)
where
θ = angle of the rampN = 3 kg x 9.81 m/s² x cos (20)
N = 27.66 N
F_friction = 0.2 x 27.66 N
F_friction = 5.53 N
The net force can now be calculated using Newton's second law:
F_net = ma
where
a = acceleration = 2 m/s²F_net = 3 kg x 2 m/s²
F_net = 6 N
The work done by friction can be calculated as:
W_friction = F_friction x d
where
d = distance moved by the box up the ramp = 5mW_friction = 5.53 N x 5 m
W_friction = 27.66 J
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if the box 3 kg acquires constant acceleration of 2m/s² and moves up the ramp by 5m from initial position. calculate work done by kinetic friction, if the coefficient of kinetic friction is 0.2 and inclination of the ramp is 20⁰.
A bike accelerates from 0 m/s to 15 m/s over the span of 5 seconds. How fast is the bike
traveling after 2.5 seconds?
Answers
The bike is travelling at 22.5 m/s after 2.5 s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the acceleration Initial velocity (u) = 0 m/sFinal velocity (v) = 15 m/sTime (t) = 5 sAcceleration (a) =?a = (v – u) / t
a = (15 – 0) / 5
a = 3 m/s²
How to determine the final velocity in the first 2.5 s Initial velocity (u) = 15 m/sAcceleration (a) = 3 m/s²Time (t) = 2.5 s Final velocity (v) = ?a = (v – u) / t
3 = (v – 15) / 2.5
Cross multiply
v – 15 = 3 × 2.5
v – 15 = 7.5
Collect like terms
v = 7.5 + 15
v = 22.5 m/s
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Define universal gravitational constant.
Answers
from the circuit in fig. 2.83, find i, the power dissipated by the resistor, and the power supplied by each source.
Answers
We have, by using KVL in the circuit in the axis of I. social change and social = 10−6 Present f.... 2.19 Calculate I, the power lost by the resistance, and the arrangement
What does the word "resistance" mean?
Describe resistance. Electrical | January 12, 2021 The obstruction to part of the electrical circuit is measured by resistance. The Greek letter iota () represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm (1784–1854), a German scientist who investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance.
What is a circuit's electrical resistance?
The relationship between the induced voltage and the current through a circuit determines its electrical resistance. Ohms is the symbol for electrical resistance. Some materials permit the flow of electric charge more easily than others. The electrical resistance gauges how much the circuit restricts the movement of this electric charge.
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If the instantaneous voltage at a given moment in the circuit RL is V=VmaxSIN(150), then the instantaneous current at the...... same instant I=Imaxsin
Answers
The instantaneous current at the same moment in the RL circuit can be expressed as I = Imaxsin(150), where Imax represents the maximum current.
1. Given that the instantaneous voltage at a specific moment in the RL circuit is V = Vmaxsin(150).
2. We can express the current at the same moment using Ohm's Law, which states that V = IR, where V is voltage, I is current, and R is resistance.
3. In an RL circuit, the resistance is represented by the symbol R, and it is typically associated with the resistance of the wire or any resistors in the circuit.
4. However, the given equation does not explicitly mention resistance.
5. Since we are considering an RL circuit, it suggests the presence of inductance (L) along with resistance (R).
6. In an RL circuit, the voltage across the inductor (VL) can be expressed as VL = L(di/dt), where L is the inductance and di/dt represents the rate of change of current.
7. At any given instant, the total voltage across the circuit (V) can be expressed as the sum of the voltage across the resistor (VR) and the voltage across the inductor (VL).
8. Therefore, V = VR + VL.
9. Since the given equation represents the instantaneous voltage (V), we can deduce that V = VR.
10. By comparing V = VR with Ohm's Law (V = IR), we can conclude that I = Imaxsin(150), where Imax represents the maximum current.
The specific values of Vmax, Imax, and the phase angle have not been provided in the question, so we are working with the general expression.
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Hey, I need help can someone help me out, please?
Answers
Explanation:
6) newton
7) f =ma = 15*15 = 225N
8) a= 100/20 = 5ms^-2
Answer:
6 newton
7) f =ma = 15*15 = 225N
8) a= 100/20 = 5ms^-2
Explanation:
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Draw a labelled diagram to show how a pure spectrum with white light maybe produced.
Answers
Answer:
The below diagram shows pure spectrum with white light
Explanation:
how is potential energy a scalar quantity even though it can be negative?
Answers
Explanation:
Potential energy is a scalar quantity because it has only magnitude and no direction. Its ability to be negative does not affect its scalar nature.
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Given that average speed is distance traveled divided by time, determine the values of m and n when the time it takes a beam of light to get from the Sun to the Earth (in s) is written in scientific notation. Note: the speed of light is approximately 3.0×108 m/s. Enter m and n, separated by commas.
Answers
Answer:
\(5,2\)
Explanation:
From the question we are told that:
Speed of light \(C=3.0×10^8 m/s.\)
Generally the equation for Average Speed is mathematically given by
\(V_{avg}=\frac{d}{t}\)
Where
d=Distance between the Earth and the sun
\(d=1.5*10^11m\)
Therefore
\(t=\frac{d}{V_{avg}}\)
\(t=\frac{1.5*10^11m}{3.0×10^8 m/s.}\)
\(t=5*10^2s\)
Since m and n is given in the form of
\(m*10^n\)
Therefore
\(m=5 & n=2\)
\(5,2\)
Place a few small weights on top of the cylinder to slightly compress the gas inside. Consider the air in the entire system. Assuming that the system remains perfectly sealed, describe how each of the following changes (if at all). Wherever possible, explain your answers in terms of changes to the individual molecules of air that produces the macroscopic changes.
a. Volume
b. Pressure
c. Temperature
d. Number of molecules
Answers
80 POINTSSS
The picture above represents what kind of circuit?
open series circuit
open parallel circuit
closed series circuit
closed parallel circuit
Answers
Answer:
closed parallel circuit