Answers
Answer:
magnetic force: compass, door catch, speaker, armatureelectric force: air filter, socksExplanation:
You are expected to have some understanding of how these devices work. It is helpful to actually see one or take it apart.
Magnetic force is involved where there is a magnet or material that responds to a magnet.
Of course a compass aligns itself with the magnetic field of the earth.
A magnetic door catch uses a magnet or pair of magnets to attract a metal plate, holding the door closed.
A speaker uses the reaction between the magnetic field in a coil of wire and that of a fixed magnet to move the speaker cone. (There are versions of speakers that use electrostatic force (electric field), but those are less common.)
A motor moves by creating a magnetic field in the armature that reacts with one in the stator. The latter can be created by fixed magnets, or by an electric current.
__
Electric force is involved when the operation is a result of the attraction between oppositely charged particles.
An electronic air filter uses the attraction of charged particles to attract "dirt" in the air to a charged surface, so removing it from the air.
Socks from the dryer often cling to each other (static cling) because the charge they get from rubbing other dryer contents is not dissipated in the dry air. (Fabric softener can reduce this effect, presumably by making the materials more electrically conductive.)
Related Questions
A needle 5cm long can just rest on the surface of the water without wetting. What us it's weight? Surface tension is 0.007N/m
Answers
Answer:
c
Explanation:
A car travels 1800 m south in 35 s, what is it's velocity?
Answers
Answer:
its velocity is 51, or 51.42 to be exact it would be: 51.4285714286
The diagram shows the protons and neutrons in an atom.
p = protons n = neutrons
Which fundamental force is shown?
O static
o electromagnetic
O strong
O light
p
7
na LA
P
n
Answers
Answer:
O strong
Explanation:
From the diagram, we are dealing with strong forces.
Strong forces are one of the four fundamental forces found in nature. The other forces are gravitational forces, electromagnetism and weak interactions.
Strong forces holds protons and neutrons together in an atom. They are domiciled in the nucleus and are sources of nuclear energy. They are also called strong nuclear forces.Answer:
Strong
Explanation:
With enough time, would an ice pop melt on a cool autumn day? Explain.
Answers
Yes, it is possible that with enough time period, an ice pop will melt on a cool autumn day. As it is not cold enough to keep it in the freezing condition.
What are the conditions for ice formation?An ice cube can stay in the freezing condition when it is most often found at the temperature range above the frontal inversion which is warmer than 0°C and the temperature which is below and colder than 0°C. Icing above the warm frontal surface, in the regions where cloud temperatures are colder than 0°C, is usually confined to a layer which is less than 3,000 feet thickness.
A one inch ice cube at the 75°F room temperature (24°C) will take 45 to 60 minutes to melt at that particular temperature. A standard one ounce cube will take 90 to 120 minutes to melt at the same temperature range.
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Definition: To stir, shake, mix, or otherwise move something in order to accelerate a reaction or other
change.
Answers
agitate... hope this helps.......
In Chemistry, to accelerate a reaction often involves using a catalyst to increase the reaction rate without the catalyst being consumed. Acceleration in Physics refers to a change in an object's velocity, as described by Newton's first law of motion.
Explanation:The term 'to accelerate' typically implies speeding up any process or reaction. In the context of Chemistry, this often refers to increasing the rate at which a chemical reaction occurs. Factors that can accelerate a reaction include stirring, increasing temperature, or adding a catalyst. A catalyst is a substance that increases the speed of a reaction without being consumed in the process. Acceleration, specifically in Physics, is defined as the change in velocity - which can be in the magnitude or direction or both. Newton's first law of motion, also known as the law of inertia, states that a body at rest remains at rest, and a body in motion remains in motion at a constant velocity unless acted upon by a net external force — implying the role of acceleration when this state is altered.
You should never swim alone true or false
Answers
Answer:True
Explanation:
if you were to swim alone and something bad happen and there was none on the beach you'd be stuck out so NEVER swim alone :)
In a battery powered flashlight, how is energy converted
Answers
Answer:
The correct answers are "chemical energy into electrical energy" and then "the electrical energy into light energy". Explanation: In the battery-powered flashlight, the battery supplies the chemical energy which makes the electrons to flow in the circuit and constitutes the current
Explanation:
List two ways you changed the speed of the ball without changing its direction..
Answers
Dominic Roth is in a roller coaster car, which rapidly picks up speed as it rolls down a slope.
As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the
slope, his speed is 22 m/s. What is its average acceleration?
Answers
Answer: 6m/s²
Explanation:
Acceleration = change in velocity / time
Initial velocity = 4m/s
Final velocity = 22m/s
Time = 3s
Acceleration = (22 - 4) / 3
a = 18 / 3 = 6m/s²
1. For a reaction to occur, energy must be
to break chemical bonds.
O A released
OB converted
OC absorbed
Answers
For a reaction to occur, energy must be absorbed to break chemical bonds
Explanation:
Reactions can be classified as chemical reaction, nuclear reaction, thermal reaction. So in these three reaction types, the nature of energy will only be varying.
But in order to execute a reaction, there should be breaking of existing bonds and then formation of new bonds. So for breaking of the bonds of reactants, energy should be absorbed from the surrounding.
Then the extra energy will be released after forming the products. Thus, the process of absorption of energy will lead to endothermic process and the process of releasing of energy will lead to exothermic reaction. So for a reaction to occur, energy must be absorbed to break the chemical bonds.
Shay reacts solid zinc and aqueous copper sulfate to form aqueous zinc sulfate and solid copper. If he reacts 10.1 grams of zinc with 18.6 grams of copper sulfate and yields 20 grams of zinc sulfate and 8.7 grams of copper, then was mass conserved? explain how you know.
Answers
Answer:
Now since mass of reactant is equal to mass of the product after the reaction so we can say that mass conservation is applicable here
Explanation:
As we know that zinc reacts with copper sulfate
so the reaction is given as
[tex]Zn + CuSO_4 --> ZnSO_4 + Cu[/tex]
so here we have
[tex]Zn = 10.1 g[/tex]
[tex]CuSO_4 = 18.6 g[/tex]
[tex]ZnSO_4 = 20 g[/tex]
[tex]Cu = 8.7 g[/tex]
Now total mass of reactant is given as
[tex]M_1 = 10.1 + 18.6 = 28.7 g[/tex]
Mass of the product is given as
[tex]M_2 = 20 + 8.7 = 28.7 g[/tex]
Now since mass of reactant is equal to mass of the product after the reaction so we can say that mass conservation is applicable here
A missile is moving 1350 m/s at 25.0° angle. It needs to hit in a 55.0° direction in 10.20 s. What is the direction of its final velocity?
Answers
Answer:
final velocity = 3504 m/s
Explanation:
Given data:
velocity of missile = Vi = 1350m/s
angle at which missile is moving = 25degree
distance between missile and targets = 23500m
angle between target and missile=55degree
time=10.2s
To find:
Final velocity: ?
Formula:
x = Vx*t + ½*ax*t²
Let x be the horizontal component of distance
x = ertical component of distance
t-time
ax = horizontal component of acceleration
ay = Vertical component of acceleration
Vx = horizontal component of velocity
Vy = Vertical component of velocity
Solution:
x = Vx*t + ½*ax*t²
23500m * cos55.0º = 1350m/s * cos25.0º * 10.20s + ½ * ax * (10.20s)²
ax = 19.2 m/s²
V'x = Vx + ax*t = 1350m/s * cos25.0º + 19.2m/s² * 10.20s = 1419 m/s
similarly vertically:
y = Vy*t + ½*ay*t²
23500m * sin55.0º = 1350m/s * sin25.0º * 10.20s + ½ * ay * (10.20s)²
ay = 258 m/s²
V'y = Vy + ay*t
= 1350m/s * sin25.0º + 258m/s² * 10.20s = 3204 m/s
V = √(V'x² + V'y²)
= 3504 m/s
Question 15 (4 points)
The environmental impact of deforestation is decreased by using buffer zones of trees to prevent clear-cut areas from
looking so bare.
True
False
Answers
Answer:
True
Explanation:
A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron? A 0.00578 J/g°C B 0.45 J/g°C C 2.20 J/g°C D 4.18 J/g°C
Answers
Answer:
b.
[tex]0.45J/g\textdegree C[/tex]
Explanation:
Specific heat capacity is the amount of heat required to raise one gram of substance by one degree celcius.
It's calculated by the formula:[tex]s=\frac{q}{m\bigtriangleup T}[/tex], where q=heat and m= mass
[tex]\bigtriangleup T=20-0=20\textdegree C\\q=1004J\\m=111.6g[/tex]
Therefore:
[tex]s=\frac{1004J}{111.6g\times20\textdegree C}\\=0.45J/g\textdegree C[/tex]
Hence the iron's specific heat capacity is [tex]0.45J/g\textdegree C[/tex]
6. A Cadillac Escalade has a mass of 2 569.6 kg, if it accelerates at 4.65m/S
force on the car?
Answers
Answer:
F= 2569.6 X 4.65 = 11,948.64
*Multiply the mass and the acceleration to find the force
Explanation:
Answer:11948.64kgm/s^2
Explanation:
Force=mass x acceleration
Force=2569.6 x 4.65
Force=11948.64kgm/s^2
a bucket of unstretched springs (k=8 N/m) resting on the ground.Calculate the bucket's Mechanical Energy in [J}
Answers
Answer:
0 J
Explanation:
The mechanical energy of a spring is given by [tex]0.5kx^{2}[/tex] where k is spring constant and x is extension of spring. Since the spring is unstretched, its extension is zero.
#Notice that the potential energy is 0.
-Substituting spring constant, k with 8 and extension with zero then the mechanical energy will be
[tex]0.5\times 8\times 0^{2}=0 J[/tex]
which direction does air pressure exert force at sea level
Answers
Answer:
It is exerted in all directions at sea level, and this is because air molecules move in all directions.
At sea level, air pressure exerts force in all directions.
Direction of air pressure at sea levelAt sea level, air pressure exerts force in all directions. This force, known as atmospheric pressure, is the result of the weight of the air molecules above a given point.
Since air is a fluid, the air pressure at any location is distributed evenly in all directions, including upward, downward, and sideways.
This balanced distribution of air pressure is what helps maintain the stability of the Earth's atmosphere and is an essential factor in various weather phenomena and atmospheric dynamics.
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A slug traveling at 3 mm/h, East decided to race the slug next to him increasing his velocity to 5 mm/h, East in one hour. What was the slug's acceleration?
Answers
The Acceleration of slug would be 2 mm/hr²
Step by step Explanation:
Given of the solution
Initial velocity of the slug,(we can represent as [tex]v_{i}[/tex]) [tex]v_{i}[/tex]= 3 mm/hr
Final velocity of the slug,(we can represent as [tex]v_{f}[/tex] ) [tex]v_{f}[/tex]= 5 mm/hr
Time, t = 1 hr
Acceleration, a = ?
We know,
[tex]a = \frac{(5-3)}{1} \\\\a = 2 mm/hr^2[/tex]
Therefore, The Acceleration of slug would be 2 mm/hr²
A 2 kilogram mass is lifted 4 meters above the ground what is the change it gravitational energy
Answers
Answer:
78.4 J
Explanation:
The gravitational potential energy of an object is the energy possessed by the object due to its location in the gravitational field.
The change in gravitational potential energy of an object is given by:
[tex]\Delta U=mg\Delta h[/tex]
where:
m is the mass of the object
[tex]g=9.8 m/s^2[/tex] is the acceleration due to gravity
[tex]\Delta h[/tex] is the change in height of the object
For the mass in this problem, we have:
m = 2 kg is the mass
[tex]\Delta h = 4 m[/tex] is the change in height
So, its change in gravitational energy is:
[tex]\Delta U=(2)(9.8)(4)=78.4 J[/tex]
what happens when a plastic lid sprinkled with iron filings is placed over a magnet?
Answers
When a plastic lid is sprinkled with iron filings is placed over a magnet then a pattern is formed. The iron fillings arrange themselves in a way how magnetic field is present. The force of the magnet is the strongest at the two ends because more iron particles are concentrated in these areas. The magnetic lines of flux flow from one end to the other.
A string of fifty 15 ohm Christmas tree lights are connected in series. One burns out, they all burn out.Calculate the total resistance. (Draw a one way switch to control all of them at once)
Answers
The effective resistance of many individual resistors in series is the sum of the individual resistances.
50 items in series, each with a resistance of 15 ohms, are equivalent to a single resistance of (15 x 50) = 750 ohms.
By the way . . . If one of the little bulbs in series burns out, all the others do NOT burn out. They simply get turned off and go dark, because the current can't flow through the one that did.
The total resistance of the string of fifty 15 ohm Christmas tree lights that are connected in series is 750 ohms.
Total resistance of the series resistors
The total resistance of the series resistors is determined by adding all the componenets of the resistors together.
Rt = R1 + R2 + R3 + ----
where;
Rt is the total resistance of the series circuitRt = 50 x (15 ohms)
Rt = 750 ohms
Thus, the total resistance of the string of fifty 15 ohm Christmas tree lights that are connected in series is 750 ohms.
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Noah stands 170 meters away from a steep canyon wall. He shouts and hears the echo of his voice one second later. What is the speed of the wave?
Answers
answer: 340 m/s
explanation: in this instance, the sound wave travels 340 meters in 1 second, so the speed of the wave is 340 m/s. remember, when there is a reflection, the wave doubles its distance. in other words, the distance traveled by the sound wave in 1 second is equivalent to the 170 meters down to the canyon wall plus the 170 meters back from the canyon wall.
The speed of the wave is 340 m/s. It can be calculated by dividing distance by time.
Given:
Distance = 170 meters
Time = 1 Seconds
What is Speed?It is defined as the ratio between distance and time.
Speed = Distance / Time
In this instance, The sound wave travels 340 meters in 1 second, So the speed of the wave is 340 m/s.
When there is a reflection, the wave doubles its distance. In other words, the distance traveled by the sound wave in 1 second is equivalent to 170 meters down to the canyon wall plus 170 meters back from the canyon wall.
Thus, the speed of the wave is 340 m/s.
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If the radius of the atom is the distance from point A to D, where is the MOST likely location of the LEAST concentration of mass?
A)
A
B)
B
C)
C
D)
D
Answers
The MOST likely location of the LEAST concentration of mass in an atom is at point D, which is at the radius of the atom.
1. The nucleus of an atom contains the majority of the mass and is located at the center of the atom.
2. As you move away from the nucleus towards the electron cloud, the concentration of mass decreases significantly.
3. At the radius of the atom (point D), the mass is distributed over a larger area, leading to the least concentration of mass at this point.
4. Therefore, point D, being at the outer edge of the atom, is the most likely location of the least concentration of mass in an atom.
This concept is crucial in understanding the distribution of mass within an atom and how it varies based on distance from the nucleus.
A 5.00 kg crate is on a 21.0° hill.
Using X-Y axes tilted down the
plane, what is the y-component
of the weight?
(Unit = N)
Answers
Answer: 4575N
Explanation:
For y component, W = mgcosø
W = 500×9.8cos21
W = 4574.54N
Find the diagram in the attached file
Answer:
-45.745
Explanation:
negative because it is downward
Acceleration
a=124 -0)3
a (Vf-vilt
a velocity
Vf- fina velocity
t = time vizan
initial velocity
Answers
Answer:
[tex]41.3 m/s^2[/tex]
Explanation:
The acceleration of an object is the rate of change of the velocity of the object.
It is a vector quantity, so it has a magnitude and a direction.
The acceleration is given by:
[tex]a=\frac{v_f-v_i}{t}[/tex]
where
[tex]v_f[/tex] is the final velocity
[tex]v_i[/tex] is the initial velocity
t is the time taken for the velocity to change
If the acceleration is positive, the direction is the same as the initial velocity; if the acceleration is negative, the direction is opposite to the initial velocity.
In this problem:
[tex]v_i=0[/tex] is the initial velocity
[tex]v_f=124 m/s[/tex] is the final velocity
t = 3 s is the time
So, the acceleration is
[tex]a=\frac{124-0}{3}=41.3 m/s^2[/tex]
1) A force of 20 Newton acts on a bar having a cross sectional area of 0.8m^2 and length 10cm.calculate the stress developed in the bar
Answers
Answer:25N/M^2
Explanation:
Force=20N Area=0.8M^2
Stress=force/area
Stress=20/0.8
Stress=25N/M^2
7. What two controls on a car cause a change in speed? What control causes a change in
velocity?
Answers
-- A change in speed can be either speeding up or slowing down. These effects can be caused by the gas pedal or the brake pedal.
-- Velocity is made of the car's speed and direction. These can be changed by the gas pedal, the brake pedal, or the steering wheel.
Final answer:
The two controls causing a change in car speed are the accelerator and brakes. For velocity, any change in speed or direction (affected by the accelerator and steering wheel) can alter it. An odometer measures distance traveled, while a speedometer measures instantaneous speed.
Explanation:
The two controls on a car that cause a change in speed are the accelerator (gas pedal) and the brakes. Pressing the accelerator increases the car's speed, while applying the brakes decreases it. The control that causes a change in velocity is both the accelerator and the steering wheel. This is because velocity includes both speed and direction. Thus, pressing the accelerator affects speed, which is a part of velocity, and turning the steering wheel alters the direction of the car's velocity.
Velocity is defined by both speed, which is a scalar quantity, and direction, a vector quantity. Changing either of these two or both simultaneously, results in a change in velocity. Acceleration, therefore, refers to the rate at which velocity changes over time and can occur due to a change in speed, direction, or both. For example, when a car moves from left to right at a constant velocity and the accelerator is pressed, both the velocity and acceleration vectors point rightwards. However, if the brakes are applied while the car is still moving to the right, the velocity remains directed to the right but the acceleration vector points to the left, indicating deceleration.
The car's odometer measures the total distance traveled, which is a scalar quantity, while the speedometer measures the instantaneous speed of the car, also a scalar. To illustrate the difference between average speed and the magnitude of average velocity consider a car trip where the car moves in a circle and returns to its starting point. The average speed is the total distance traveled divided by the elapsed time, whereas the magnitude of average velocity would be zero since displacement is zero after completing the loop. The two quantities are the same if the car travels in a straight line without changing direction.
Identify the correct Units for a Force
Answers
Answer:
Newton
Explanation:
Newton is the correct unit for a force
An airplane travels 622.4 km from Kansas City to St. Louis. The flight takes 4.7 hours. Calculate the Velocity of the plane
Answers
Answer:
132.43km/h
Explanation:
Velocity = displacement/time
Given
Displacement = 622.4km
Time = 4.7 hours
Therefore,
Velocity = 622.4km/4.7hrs
= 132.43km/h
How much heat is required to raise the temperature of 0,20 kg of water from 15 degrees Celsius to 45 degrees Celsius?
Answers
Answer:
25116 J
Explanation:
The amount of heat required to raise the temperature of a substance is given by the equation
[tex]Q=mC\Delta T[/tex]
where
m is the mass of hte substance
C is the specific heat capacity of the substance
[tex]\Delta T[/tex] is the change in temperature
For the sample of water in this problem, we have:
m = 0.20 kg is the mass
[tex]C=4186 J/kg^{\circ}C[/tex] is the specific heat of water
[tex]\Delta T=45-15=30^{\circ}C[/tex] is the increase in temperature
Therefore, the amount of heat required is
[tex]Q=(0.20)(4186)(30)=25116 J[/tex]