Read the elapsed time on the stopwatch and answer the questions.
In which digit is there the least amount of confidence?
How many significant figures does this measurement have? I need help quick
Answer:
1.7
2.4
Explanation:
Answer:
1.7
2.4
Explanation:
You are working as an intern for a meteorological laboratory. You are out in the field taking measurements from a balloon that is carrying equipment designed to measure electric fields in the atmosphere. Your supervisor has asked you to determine the average volume charge density at a certain height in the air. When the balloon is at an altitude of 500 m above the ground, the electric field is measured to be 160 N/C directed downward. At 800 m above the ground, the electric field is 120 N/C downward.
(a) Determine the average volume charge density (in C/m3) in the layer of air between these two elevations. (Enter the magnitude.)
(b) Is this layer of air positively or negatively charged?
positively charged
negatively charged
Answer:
a. -6.99 × 10³⁰ C/m³ b. The layer of air is negatively charged.
Explanation:
With E₁ = electric field at 500 m above the ground = 160 N/C (it is negative since it is directed downwards).
Also, with E₂ = electric field at 800 m above the ground = 120 N/C (it is negative since it is directed downwards).
The total flux, Ψ = ∫E.dA = E₁dAcosθ + E₂dAcosθ
For the 800 m surface E is parallel to dA, that is = 0° and For the 500 m surface E is anti-parallel to dA, that is = 180°
Ψ = ∫E₁dAcos180° + ∫E₂dAcos0°
= -∫E₁dA + ∫E₂dA
= -E₁∫dA + E₂∫dA
= -E₁4πR² + E₂4πR²
= (-E₁ + E₂)4πR² where R = radius of earth = 6.4 × 10⁶ m
= (-160 N/C + 120 N/C)4π(6.4 × 10⁶ m)²
= - 40 N/C)4π(6.4 × 10⁶ m)²
= -20588.74 × 10¹² C
= -2.058874 × 10¹⁶ C
≅ -2.06 × 10¹⁶ Nm²/C.
The since charge, Q = Ψ/ε₀, the total charge through the area is thus
Q = Ψ/ε₀
= -2.06 × 10¹⁶ Nm²/C ÷ 8.854 × 10⁻¹² F/m
= -0.233 × 10²⁸ C/m²
= -2.33 × 10²⁸ C/m².
So, the charge in the volume = charge net charge of surface × width of volume. So the charge in the volume Q' = QΔh = Q(h₂ - h₁) where h₁ = 500 m and h₂ = 800 m
Q' = Q(h₂ - h₁)
= -2.33 × 10²⁸ C/m²(800 m - 500 m)
= -2.33 × 10²⁸ C/m²(300 m)
= -699 × 10²⁸ C/m³
= -6.99 × 10³⁰ C/m³
b. Since Q' = -6.99 × 10³⁰ C/m³, the layer of air is negatively charged.
In what way is a screw similar to an inclined plane?
-A screw and an inclined plane both have threads.
-A screw is put in place with a screwdriver, which is a wedge.
-A screw is an inclined plane wrapped around a cylinder.
Answer:
-A screw is an inclined plane wrapped around a cylinder.
Explanation:
Answer:
b
Explanation:
A piece of iron of mass 200g and tempreture 300°C is dropped into 1.00 kg of water of tempreture 20°C. Predict the final equilibrium of the water.
Answer:
The final equilibrium T_{f} = 25.7[°C]
Explanation:
In order to solve this problem we must have a clear concept of heat transfer. Heat transfer is defined as the transmission of heat from one body that is at a higher temperature to another at a lower temperature.
That is to say for this case the heat is transferred from the iron to the water, the temperature of the water will increase, while the temperature of the iron will decrease. At the end of the process a thermal balance is found, i.e. the temperature of iron and water will be equal.
The temperature of thermal equilibrium will be T_f.
The heat absorbed by water will be equal to the heat rejected by Iron.
[tex]Q_{iron} = Q_{water}[/tex]
Heat transfer can be found by means of the following equation.
[tex]Q_{iron}=m*C_{piron}*(T_{i}-T_{f})[/tex]
where:
Qiron = Iron heat transfer [kJ]
m = iron mass = 200 [g] = 0.2 [kg]
T_i = Initial temperature of the iron = 300 [°C]
T_f = final temperature [°C]
[tex]Q_{water}=m*C_{pwater}*(T_{f}-T_{iwater})[/tex]
Cp_iron = 437 [J/kg*°C]
Cp_water = 4200 [J/kg*°C]
[tex]0.2*437*(300-T_{f})=1*4200*(T_{f}-20)\\26220-87.4*T_{f}=4200*T_{f}-84000\\26220+84000=4200*T_{f}+87.4*T_{f}\\110220 = 4287.4*T_{f}\\T_{f}=25.7[C][/tex]
1. A ball is thrown straight up.if the launch velocity is 15 m/s, at what velocity will the ball return to the thrower's hand?
2. A boat moves across a river going 18 m/s. At the same time there is a current flowing at a right angle to the boat at 6 m/s. What is the resulting velocity of the boat?
Answer:
1) The velocity of the ball return to the thrower's hand is -15 meters per second.
2) The resulting velocity of the boat is [tex]\vec v_{B} = 6\,\hat{i}+18\,\hat{j}\,\left[\frac{m}{s} \right][/tex].
Explanation:
1) Let suppose that ball experiments a free fall, that is an uniform accelerated motion, in which effects from gravity and Earth's rotation can be neglected. The velocity of the ball is represented by the following equations of motion:
Position
[tex]v_{o}\cdot t -\frac{1}{2}\cdot g\cdot t^{2} = 0[/tex]
[tex]t\cdot \left(v_{o}-\frac{1}{2}\cdot g\cdot t \right) = 0[/tex] (1)
Velocity
[tex]v = v_{o}-g\cdot t[/tex] (2)
Where:
[tex]t[/tex] - Time, measured in seconds.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]v_{o}[/tex] - Initial velocity of the ball, measured in meters per second.
[tex]v[/tex] - Final velocity of the ball, measured in meters per second.
From (1), we get the time when the ball returns to the thrower's hand:
[tex]v_{o}-\frac{1}{2}\cdot g\cdot t = 0[/tex]
[tex]t = \frac{2\cdot v_{o}}{g}[/tex]
And then we apply this result in (2):
[tex]v = v_{o}-g\cdot \left(\frac{2\cdot v_{o}}{g} \right)[/tex]
[tex]v = -v_{o}[/tex] (3)
Then, the velocity of the ball return to the thrower's hand is -15 meters per second.
2) The resulting velocity of the boat ([tex]\vec v_{B}[/tex]) is represented by the vectorial sum of the velocity of the boat relative to the river ([tex]\vec v_{B/R}[/tex]) and the velocity of the river ([tex]\vec v_{R}[/tex]), both measured in meters per second, that is:
[tex]\vec v_{B} = \vec v_{R}+\vec {v}_{B/R}[/tex] (4)
If we know that [tex]\vec v_{R} = 6\,\hat{i}\,\left[\frac{m}{s} \right][/tex] and [tex]\vec v_{B/R} = 18\,\hat{j}\,\left[\frac{m}{s} \right][/tex], then the resulting velocity of the boat is:
[tex]\vec v_{B} = 6\,\hat{i}+18\,\hat{j}\,\left[\frac{m}{s} \right][/tex]
The resulting velocity of the boat is [tex]\vec v_{B} = 6\,\hat{i}+18\,\hat{j}\,\left[\frac{m}{s} \right][/tex].
The pressure of liquid varies as per
its depth
Answer:
Yes.
Explanation:
The pressure varies as per the depth of the container
At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three different directions. As a result, three forces act on the ball, F1, F2, and F3. The magnitudes of F1 and F2 are F1=50.0N and F2=90.0N. F1 acts under the angle of 60degrees with respect to the x axis and F2 is directed along the x-axis. Find the magnitude and direction of F3 such that the resultant force acting on the ball is zero.
Answer:
F₃ = 122.88 N
θ₃ = 20.63°
Explanation:
First we find the components of F₁:
For x-component:
F₁ₓ = F₁ Cos θ₁
F₁ₓ = (50 N) Cos 60°
F₁ₓ = 25 N
For y-component:
F₁y = F₁ Sin θ₁
F₁y = (50 N) Sin 60°
F₁y = 43.3 N
Now, for F₂. As, F₂ acts along x-axis. Therefore, its y-component will be zero and its x-xomponent will be equal to the magnitude of force itself:
F₂ₓ = F₂ = 90 N
F₂y = 0 N
Now, for the resultant force on ball to be zero, the sum of x-components of the forces and the sum of the y-component of the forces must also be equal to zero:
F₁ₓ + F₂ₓ + F₃ₓ = 0 N
25 N + 90 N + F₃ₓ = 0 N
F₃ₓ = - 115 N
for y-components:
F₁y + F₂y + F₃y = 0 N
43.3 N + 0 N + F₃y = 0 N
F₃y = - 43.3 N
Now, the magnitude of F₃ can be found as:
F₃ = √F₃ₓ² + F₃y²
F₃ = √[(- 115 N)² + (- 43.3 N)²]
F₃ = 122.88 N
and the direction is given as:
θ₃ = tan⁻¹(F₃y/F₃ₓ) = tan⁻¹(-43.3 N/-115 N)
θ₃ = 20.63°
What is the life cycle of our sun?
Answer:
the sun is currently a mian sequence star
and will remain so for another 4-5 billion
A kangaroo hopped at 22 meters per second, saw a skunk and then
hopped at 52 meters per second. This is an example of which of the
following?
Acceleration
Velocity
Speed
motion graphs
Answer:
this is an example of acceleration
May someone please help?
Air is cooled and
becomes
[denser/less dense).
Less dense air
[rises/sinks).
Denser air
(rises/sinks).
The process repeats, producing a
Air is heated and
becomes
[denser/less dense]
within the gas
Air is cooled and
becomes denser.
Denser air sinks.
The process repeats, producing a (i wasn't sure about this one)
Air is heated and becomes less dense.
Less dense air rises.
hope this helps!
State the career function of mining engineering
Answer:Mining engineers are responsible for the effective, safe and profitable operation of mining undertakings. They are mining experts and engineers and have a background in geology as well as civil, mechanical and electrical engineering.
Explanation:
SILVER PACKAGE
The work done in lifting a 10 kg load of bricks to the top of a building 20 m high is (g = 9.8 ms-2
a) 98
b) 200 J
c) 980
d) 1960)
The radius of Mars is 3397 km; and its mass is 6.42x10²³ kg. What is the acceleration due to gravity at an altitude of 485 km above the surface of Mars?
Answer:nfeergnjknrtgrth
Explanation:
Answer:
F = GMm/r^2
MA = GMm/r^2
A = GM/r^2
A = (6.67 * 10^-11)(6.42 * 10^23) / (3.37 * 10^6)^2
A = 3.77 m/s^2
Explanation:
15. Sandra decided to talk a walk at her neighborhood park. She walks 20 meters
east, 40 meters west, and finally 50 meters east. What is her total distance
and displacement, respectively?
Answer:
Long question good luck:)..............
Explanation:
differentiate among the various forms of energy
Explanation:
Forms of energy
There are many different types of energy, which all fall into two primary forms – kinetic and potential. Energy can transform from one type to another, but it can never be destroyed or created.
Burning Questions
What are the different types of energy?
Types of energy can be categorised into two broad categories – kinetic energy (the energy of moving objects) and potential energy (energy that is stored). These are the two basic forms of energy. The different types of energy include thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.
Discover the different types of energy
Thermal Energy
Thermal (Heat) Energy
Thermal energy is created from the vibration of atoms and molecules within substances. The faster they move, the more energy they possess and the hotter they become. Thermal energy is also called heat energy.
Let's go! >
Chemical Energy
Chemical Energy
Chemical energy is stored in the bonds of atoms and molecules – it is the energy that holds these particles together. Stored chemical energy is found in food, biomass, petroleum, and natural gas.
Let's go! >
Nuclear Energy
Nuclear Energy
Nuclear energy is stored in the nucleus of atoms. This energy is released when the nuclei are combined (fusion) or split apart (fission). Nuclear power plants split the nuclei of uranium atoms to produce electricity.
Let's go! >
Electrical Energy
Electrical Energy
Electrical energy is the movement of electrons (the tiny particles that makeup atoms, along with protons and neutrons). Electrons that move through a wire are called electricity. Lightning is another example of electrical energy.
Let's go! >
Radiant Energy
Radiant Energy
Also known as light energy or electromagnetic energy, radiant energy is a type of kinetic energy that travels in waves. Examples include the energy from the sun, x-rays, and radio waves.
Let's go! >
light Energy
Light Energy
Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.
Let's go! >
Motion Energy
Motion Energy
Motion energy – or mechanical energy – is the energy stored in objects; as objects move faster, more energy is stored. Examples of motion energy include wind, a flowing river, a moving car, or a person running.
Let's go! >
Sound Energy
Sound Energy
Sound energy is the movement of energy through substances. It moves in waves and is produced when a force makes an object or substance vibrate. There is usually much less energy in sound than in other forms of energy.
Let's go! >
Elastic Energy
Elastic Energy
Elastic energy is a form of potential energy that is stored in an elastic object - such as a coiled spring or a stretched elastic band. Elastic objects store elastic energy when a force causes them to be stretched or squashed.
Let's go! >
Gravitational Energy
Gravitational Energy
Gravitational energy is a form of potential energy. It is an energy associated with gravity or gravitational force – in other words, the energy held by an object when it is in a high position compared to a lower position.
Let's go! >
What is the Law of Conservation of Energy?
While it might sound complex, the First Law of Conservation of energy simply states that energy can never be created or destroyed, but it can be transformed from one type to another.
What Do You Mean?
Types of Energy Diagram
Energy can be transformed from one form to another in different ways.
Kinetic energy is the energy of a moving object.
Potential energy is energy that is stored in an object or substance.
The Law of Conservation of energy is that energy can be transformed from one form to another, but can be neither created or destroyed.
Energy Transformations see diagram…
Notice that these energy transfer examples only show the useful energy transfers. However, car engines are also noisy (sound energy) and hot (thermal energy) and electric lamps also give out heat energy.
Cool Facts
The use of the word 'energy' dates all the way back to the 4th century BC.
Cool Facts
The word energy comes from the Greek word 'energeia', meaning 'activity.
Cool Facts
The use of the word 'energy' dates all the way back to the 4th century BC.
Cool Facts
The word energy comes from the Greek word 'energeia', meaning 'activity.
Speedy Summary
Energy transferred
Sunlight energy is converted into the chemical energy of glucose.
Energy comes in many different types, which can be categorised into two basic forms – kinetic and potential. Energy can never be created or destroyed, but it can be transformed from one type of energy to another.
Explanation:
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Starting with a constant velocity of 45 km/h, a car accelerates for 35 seconds at an acceleration of 0.45 m/s2 . What is the velocity of the car at the end of the period of 35 seconds of acceleration?
Answer:
28.3 m/s
Explanation:
Vi = 45 Km/h = 12.5 m/s
Vf - Vi = at
Vf -12.5 = 0.45(35)
Vf= 28.3 m/s
At which temperature could air hold the most water vapor?
O A. 24°C (75°F)
B. 2°C (36°F)
C. 35°C (95°F)
O D. 13°C (55°F)
SUBMIT
Explanation:
35 maybe hope it's right
Which material rises from cracks in oceanic crust?
Answer:
trenchs and magma
Explanation:
Answer: Ridges form along cracks (divergent boundaries) in the oceanic crust (Molten rock (magma) rises through these cracks and pushes to both sides. When it cools, it forms new oceanic crust. The old crust is pushed away and new crust takes over. This is called Sea-Floor Spreading.
What reaction/soccur between an acid and base.
Answer:
neutralization reaction
Explanation:
The reaction of an acid with a base is called a neutralization reaction.
es una reacción química que ocurre entre un ácido y una base produciendo sal y agua. ... Se mezcla un ácido fuerte con una base fuerte: Cuando esto sucede, la especie que quedará en disolución será la que esté en mayor cantidad respecto de la otra.
There is an attachment. There is an attachment on here.
Answer:
5 i think
Explanation:
Can two objects be at the same distance from a single point but be in different positions? Why or why not?
Plsssss help meee
Answer:Position is an object's location in relation to a reference point. Yes. Both objects are one unit away (the same distance), but they occupy different locations in space because they are in different directions.
Explanation: Hope this helps!!
Yes it is possible for two objects be at the same distance from a single point but be in different positions.
We have two objects at the same distance from a single point but are in different positions.
We have to determine whether this statement is true or not.
What is a Reference frame?A reference frame can be considered as the coordinate frame with respect to origin of which the physical quantities such as velocity, displacement , acceleration etc. of any other object in different reference frame is measured.
According to the question -
YES, Two objects can have same distance from a single point or a reference point (say origin) and can be at different positions. For example - Two different points with Position vectors -
P(1) = i + j
P(2) = - i + j
are located. Now, distance of point P(1) from origin will be - [tex]\sqrt{1+1}=\sqrt{2}[/tex] and that of point P(2) from origin will be - [tex]\sqrt{(-1)^{2} +(1)^{2} } =\sqrt{2}[/tex]
Hence, yes it is possible for two objects be at the same distance from a single point but be in different positions.
To solve more questions on Reference frames, visit the link below-
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During a laboratory experiment, the temperature of the gas in a balloon is varied and the
volume of the balloon is measured.
A)
Which quantity is the independent variable?
B)
Which quantity is the dependent variable?
a ball is rolling ar 4.80m/s over level ground when it encounters a ramp which gives it an acceleration of -0.875m/s^{2. if the ramp is 0.750m long, what is the final velocity of the ball when it reaches the top of the ramp?
Answer:
4.66m/s
Explanation:
Given parameters:
Initial velocity = 4.8m/s
Acceleration = -0875m/s²
Length of the ramp = 0.75m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we apply the right motion equation;
V² = U² + 2aS
V is the final velocity
U is the initial velocity
a is the acceleration
S is the distance = length of ramp
Insert the parameters;
V² = 4.8² + 2(-0.875)0.75
V² = 23.04 - 1.31
V² = 21.73
V = √21.73 = 4.66m/s
Can anyone know what is UV rays
Answer:
I know this need u in online class LOL
Explanation:
Ultraviolet is a form of electromagnetic radiation with wavelength from 10 to 400 nm, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
What is the normal force acting on the 7.50 kg box shown?
The answer would be 31 N. This is because Fn = 7.5*9.8*sin(25).
A car is driving down the road at 35 m/s when the driver slams on the brakes. The car stops in a distance of 75 meters. The braking force necessary to do this is 9,800 Newtons. How much work do the brakes perform stopping the car?
Answer:
If the car is initially travelling at u m/s, then the stopping distance d m travelled by ... the speed of the car at the instant the brakes are applied. ... Common usage will force us to depart from this later in the notes. ... The history of these equations is not absolutely clear, but we do have some ... Newton (1642–1727) and Leibniz.
Explanation:
hope this helped
A toy train engine is rolling freely at a constant speed on a level piece of track. The train engine
collides with a stationary truck, and joins with it. Before the collision the train engine is travelling at
0.30 m/s, and has a mass of 700g. If the stationary truck has as mass of 400g. calculate the speed
of the joined engine and truck immediately after the collision.
(PLEASE answer with working).
Answer:
v₃ = 0.19 [m/s]
Explanation:
To solve this problem we must use the principle of conservation of the linear momentum, which is defined as the momentum before the collision is equal to the momentum after the collision.
ΣPbefore = ΣPafter
[tex]P=m*v[/tex]
P = momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
Let's imagine that the toy train moves to the right, this movement is taken as positive.
[tex](m_{1}*v_{1})+(m_{2}*v_{2})= (m_{1}+m_{2})*v_{3}[/tex]
where:
m₁ = mass = 700 [g] = 0.7 [kg]
v₁ = velocity = 0.3 [m/s]
m2 = mass = 400 [g] = 0.4 [kg]
v₂ = 0 (stationary truck, there is no movement)
v₃ = final velocity of the joined engine and truck.
Now replacing:
[tex](0.7*0.3)+(0.4*0)= (0.7+0.4)*v_{3}\\0.21 = 1.1*v_{3}\\v_{3}= 0.19 [m/s][/tex]
(Need Help) (ASAP)
You are at the Grand canyon standing at the edge of a ledge 1,857 m high. you have a mass of 61 kg you decide to take a selfie to share with your science teacher when you get home witch causes you to wonder...
a. How much gravitational potential energy do you have standing on the edge of this cliff?
b. If you were to trip and fall mid selfie, your stored potential energy would be converted to kinetic energy, as you are in motion period assume that all of the GPU calculated in part A would be converted to kinetic energy when you fall period if so, how fast would you be feeling?
Answer: Considering the gravitational field strength being 9.8...
A) 1,120,875J
B) 191.70m/s (2 DP)
Explanation:
explained in pic
You are at the Grand canyon standing at the edge of a ledge 1,857 m high. you have a mass of 61 kg you decide to take a selfie to share with your science teacher when you get home witch causes you to wonder,
a. The gravitational potential energy you have standing on the edge of this cliff is 1,120,875J.
b. If you were to trip and fall mid selfie, your stored potential energy would be converted to kinetic energy, as you are in motion period assume that all of the GPU calculated in part A would be converted to kinetic energy when you fall period if so, it was felt to be fast as 191.70m/s.
What is Gravitational Potential Energy?
Gravitational potential energy is the potential energy with respect to the gravitational force. To possess gravitational potential energy, the object to be placed in a position in the gravitational field.
According to the question,
Gravitational potential energy = mgh
As given here, h = 1857 m
m = 61
Substituting the given formula,
Gravitational potential energy = 61 × 9.8 × 1875
=1,120,875 J.
Here, As Gravitation potential energy gained, the Kinetic energy lost.
So, Kinetic Energy K.E = 1,120,875 J.
As we know the formula,
K.E = 1/2 mv²
v² =K.E / (1/2 m)
= 1,120,875 × 2 / 61
v² =36,750
v = [tex]\sqrt{36750}[/tex]
= 191.702 m/s.
The speed was calculated as 191.702 m/s.
Thus,
a. The gravitational potential energy you have standing on the edge of this cliff is 1,120,875J.
b. If you were to trip and fall mid selfie, your stored potential energy would be converted to kinetic energy, as you are in motion period assume that all of the GPU calculated in part A would be converted to kinetic energy when you fall period if so, it was felt to be fast as 191.70m/s.
Learn more about Gravitational potential energy,
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Which force results from charged particles
Answer:
electromagnetic force
Explanation:
What is a Super Massive Black Hole?
Answer:
I dont really know much but i know that it swallow anything it comes across in space.