Answer:
A. A 41 kg object that is moving east at 5 m/s
Explanation:
I'm taking this test and got it right.
While working out a man preformed 200 J of work in 3 seconds. What was his power?
A. 600 W
B. 33.3 W
C. 66.7 W
D. 112.3 W
Answer:
C
Explanation:
A watt is a joule per second. Since he is working over 3 seconds you have to divide his work over three seconds which is 200/3. This gets you 66.7 watts.
How is energy sent from Earth to space?
conduction and convection
radiation and conduction
reflection and conduction
radiation and reflection
Answer:
radiation and reflection
hope helps you
have a nice day
How should the student change the circuit to give negative values for current and
potential difference?
Answer:
changing the polarity or direction of the battery changes the sign of the voltage and the current
Explanation:
The sign of current and voltage are due to established conventions.
The way that a DC circuit with negative current values is by changing the polarity of the power source or by inverting the battery, this creates that the electrons move in the opposite direction
Changing the battery also changes the direction of the power difference, since the potential from positive to negative, in most cases negative is assigned a potential of zero volts
In summary, changing the polarity or direction of the battery changes the sign of the voltage and the current
Materials that resist the charges flowing through
are
A snail crawling at 5 mm/s travels 2 m along a wall. How long does this take?
Answer:
0.4
Explanation:
time is disance divided by speed.
Pregunta 1 (1 punto)
(05.02 LC)
In a battery (voltaic cell), in which direction do electrons flow? (1 point)
a
From the negative to the positive terminal
b
From the positive to the negative terminal
c
From the copper plate to the zinc plate
d
From the top of the plates to the bottom
Pregunta 2 (1 punto)
(05.02 LC)
Which statement best describes why some materials are not magnetic? (1 point)
a
Magnetic materials have many spinning unpaired electrons
b
Paired electrons spin in opposite directions, cancelling their magnetic fields
c
Electrons of magnetic materials are loosely held by atomic nuclei
d
Magnetic materials move positively charged particles to other atoms
Pregunta 3 (1 punto)
(05.02 LC)
If Keisha's thumb points in the direction of an electrical current, what will her fingers curled around the wire represent? (1 point)
a
The opposing electric current
b
The opposing magnetic current
c
The direction of the electric field
d
The direction of the magnetic field
Pregunta 4 (1 punto)
(05.02 MC)
A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. (1 point)
a
0.7 V
b
2 V
c
51 V
d
600 V
Pregunta 5 (1 punto)
(05.02 MC)
Alyssa is taking a walk on a nature path near her neighborhood. She carries a compass with her. As she walks along the path, she notices the needle on the compass is occasionally deflected from its original position. If she has not changed the direction she is walking, what is most likely causing the occasional shift in the needle? (1 point)
a
Changes in pressure
b
Changes in temperature
c
Sources of electrical current
d
Changes to Earth's magnetic field
Pregunta 6 (1 punto)
(05.02 MC)
Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator? (1 point)
a
The batteries do not make the charges move as much
b
The generator creates less voltage
c
The batteries have higher amperage
d
The generator current is more steady
Pregunta 7 (1 punto)
(05.02 MC)
A construction worker uses an electrical device to attract fallen nails and sharp objects from a construction site. What is causing the attraction of the metal objects? (1 point)
a
An electrical wave oscillating perpendicular to the electrical device.
b
An electrical charge radiating perpendicular to the wire
c
A magnetic wave radiating perpendicular to an electrical device
d
A magnetic wave and electrical current moving in opposite directions
Pregunta 8 (1 punto)
(05.02 MC)
A tablet draws 10.0 A when plugged into a 150-V line. If another tablet has twice as much resistance, what would the current of the second tablet be if plugged into the same line? (1 point)
a
0.60 A
b
1.5 A
c
5 A
d
15 A
In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
What is meant by electric current ?Electric current is defined as the rate of flow of electric charge through any cross-section in an electric circuit.
Here,
1) In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
2) Some materials are not magnetic because, they have equal number of electrons that spin in opposite direction. Thus, the paired electrons spin in opposite directions, cancelling their magnetic fields.
3) According to Right-hand thumb rule, if Keisha's thumb points in the direction of an electrical current, her fingers curled around the wire will represent the direction of magnetic field.
4) Resistance of the light bulb, R = 20 Ω
Current flowing through the light bulb, I = 30 A
Voltage of the battery,
V = IR
V = 30 x 20
V = 600 V
5) The deflection in the needle of the compass is due to the change in the Earth's magnetic field.
6) The batteries are not able to power all three light bulbs like the generator because, the generator current is more steady.
7) The attraction of the metal objects towards the electrical device is due to an electrical wave oscillating perpendicular to the electrical device.
8) Current in the first tablet, I₁ = 10 A
Voltage applied, V = 150 V
We know that,
I [tex]\alpha[/tex] 1/R
Therefore,
I₁/I₂ = R₂/R₁
I₂ = R₁I₁/R₂
I₂ = R x 10/2R
I₂ = 10/2 = 5 A
So, the current of the second tablet is 5 A.
Hence,
In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
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what was the main advantage of a dial phone over an operator-controlled switchboard
W&P3)A janitor pushes a mop with a force of 52 N. If the mop handle is at an angle of 52 degrees above the horizontal, how much work is required to push the mop 4.6m?
Answer:
[tex]the \: required \: work is \to \\ \boxed{w = 147.3 \: J}[/tex]
Explanation:
[tex]the \: required \: force \: is \: the \: horizonal \: component \: of \: \\ the \: force \: f_{x} = 52 \cos(52) = \boxed{32.014396716 \: N} \\ the \: work \: to \: be \: done \: is \to \\ w = f \times s = 32.014396716 \times 4.6 \\ \boxed{w = 147.26622489 \: J}[/tex]
what is the density to the object g/cm3
a five sentence summary about compounds
please it is do In 5min HELP ME PLZZZZ
Explanation:
Compounds are substances composed of two or more kind of atoms or elements joined together in a definite grouping. The properties of compounds are distinct from those of the individual elements that are combined in its make up.
There are several millions of compounds that are known. Compounds are derived from elements. They are usually represented by chemical formulae.
the glass cover not the bulb of thermometer is very thin? give reason
Answer:
Its made of glass with very thin walls to allow the heat from sample being measured to reach the liquid quickly for fast response and quick reading (improves the quickness of response by the thermometer).it has a vacuum above the liquid column so there is no resistance to the expanding liquid.
Explanation:
Hope you have a great day ;-)
A skler is traveling fast down a mountain slope. The table shows data
collected on the skier at a particular instant.
Mass
64 kg
608 N
Weight
Velocity
21 m/s, forward
Force of friction between skis and snow
6 N, backward
Force of air resistance
0.5 N, backward
Which values affect the net force on the skier?
A. The skier's weight and the force of air resistance
B. The force of friction between the skis and the snow and the force
of air resistance
C. The skier's velocity and the force of friction between the skis and
the snow
D. The skier's weight, the force of friction between the skis and snow,
and the force of air resistance
Answer:
D. The skier's weight, the force of friction between the skis and snow,
and the force of air resistance
Explanation:
If two objects, such as the the skier, and skies undergo a fast velocity downward, the net force is the total force or newtons which are all components of weight as apparent to mass and gravity, friction, which is the contact force of the skis on the snow, and air resistance which limits the air resistance is the opposite force acting on the object I'm the air relative to the density of air, cross sectional area of the object, the coefficient of drag which is based on the density of the object, it's area, and dynamic air pressure.
arrange this letters plss lubilsoity
Answer:
Solubility
Explanation:
found
possible to solve
Help!!!
Remember W = mg, 1 kg = 2.2
2) A car engine has a weight of 1500 N, what is it's mass and what is it's weight in lbs.?
Answer:
Mass is 152.95743
weight in ibs 3304.6914215069355 ibs
EXPLANATION:
1500 N = 152.95743 KG
152.95743 KG × 9.8 = 1498.982814
1 KG is 2.2 IBS
so
14o8.982814 is 3304.6914215069355
Assuming the speed of sound is 340 m/s, what is the most likely speed of the jet shown below?
A. 200 m/s
B. 500 m/s
C. 100 m/s
D. 340 m/s
Answer:
I am assuming C.
Explanation:
The speed of the jet will be 340.0 m/sec. It is found as the ratio of speed of sound and the refractive index.
What is an index of refraction?The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
The given data in the problem is;
c is the speed of light=340 m/sec
n is the index of refraction of air =1.00273
V is the speed of the jet
The index of refraction is found as;
[tex]\rm n = \frac{C}{v} \\\\ \rm v = \frac{334}{1.00273} \\\\ v=33.07 \ m/sec[/tex]
The speed of the jet will be 340.0 m/sec.
Hence, option D is correct.
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If the strength of the magnetic field at B is 6 units, the strength of the magnetic field at A is _____.
A. 1.5 units
B. 0.75 units
C. 24 units
D. 10.6 units
Answer:
I think its c but am not quite sure
Explanation:
pls mark me as brainlist
Answer:
24 units
Explanation:
hope this helps :)
1. What is the gravitational force of attraction between two 800 kg spherical objects that are 5 m apart? What would the gravitational force of attraction between these two objects be if the distance between them was changed to 10 m?
Answer:
the force of gravity between them is quadrupled .
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.
3. An airplane is heading north with an airspeed of 325 m/s with a wind from the east at 55.0 m/s. What is the airplane's velocity relative to the ground? Is the airplane's ground speed faster or slowerthan its air speed? Why?
Let a denote the airplane's velocity in the air, g its velocity on the ground, and w the velocity of the wind. (Note that these are vectors.) Then
a = g + w
and we're given
a = (325 m/s) j
w = (55.0 m/s) i
Then
g = - (55.0 m/s) i + (325 m/s) j
The ground speed is the magnitude of this vector:
||g|| = √[ (-55.0 m/s)² + (325 m/s)² ] ≈ 330. m/s
which is faster than the air speed, which is ||a|| = 325 m/s.
The relative velocity of the airplane with respect to the ground is 329.6 m/s.
The airplane's ground speed is faster than the airspeed because the relative speed of the the ground is zero causing the airplane to appear faster.
The given parameters;
speed of the airplane, [tex]V_P[/tex] = 325 m/s northspeed of the wind, [tex]V_w[/tex] = 55 m/s eastThe velocity of the airplane relative to the ground is calculated by applying Pythagoras theorem as follows;
[tex]V_G_P^2 = 325^2 + 55^2\\\\V_G_P = \sqrt{325^2 + 55^2} \\\\V_G_P = 329.6 \ m/s[/tex]
Thus, we can conclude that the airplane's ground speed is faster than the airspeed because the relative speed of the the ground is zero causing the airplane to appear faster.
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Which statement describes the path of electrons from a battery to a circuit?
O A. Electrons move away from the positive end of a battery and then
through the circuit toward the negative end of the battery.
B. Electrons move through the battery from the negative terminal to
the positive terminal and then into the circuit.
C. Electrons move through the battery from the positive terminal to
the negative terminal and then into the circuit.
D. Electrons move away from the negative end of a battery and then
through the circuit toward the positive end of the battery.
Answer:D
Explanation:
C is wrong
Electrons move away from the negative end of a battery and then through the circuit toward the positive end of the battery. So, the correct option is (D).
What is Circuit?An electronic circuit is made up of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.
A circuit is a complete circular path through which electricity flows where the circuit consists of a current source, a conductor, and a load. The term circuit can be used in a general sense to refer to a fixed path that electricity, data, or signals can travel.
In the electric circuit, electrons move away from the negative end of a battery and then through the circuit toward the positive end of the battery.
Thus, electrons move away from the negative end of a battery and then through the circuit toward the positive end of the battery. So, the correct option is (D).
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What is Latin word for "little lumps?"
Answer:
tura paulo
Explanation:
sry if im wrong ;)
А
train moves with
uniform velocity of 36km/h
for 1os, calculate
total distance travelled
travelled
Explanation:
Distance is the product of speed and time:
Distance is the product of speed and time:[math]36 \frac{km}{h[/math]} ×5seconds
Distance is the product of speed and time:[math]36 \frac{km}{h[/math]} ×5seconds = 180km3600seconds×seconds = 1803600 km
Distance is the product of speed and time:[math]36 \frac{km}{h[/math]} ×5seconds = 180km3600seconds×seconds = 1803600 km= 0.05 km
Distance is the product of speed and time:[math]36 \frac{km}{h[/math]} ×5seconds = 180km3600seconds×seconds = 1803600 km= 0.05 km= 20 m
Hope u this answer cleared ur doubt
Approximately what percentage of the almost 1,500
highway deaths in Pennsylvania each year are
attributed to aggressive driving?
A. 50%
B. 60%
C.70%
D.80%
Answer:
50% are attributed to aggressive driving
The percentage of the almost 1,500 highway deaths in Pennsylvania each year attributed to aggressive driving will be 50%.
What is aggressive driving?Aggressive driving is defined as any behind-the-wheel activity that, without regard for safety, puts another person (or people) and/or property in danger.
Aggressive driving can vary from potentially dangerous conduct to serious assault.
From the data obtained the percentage of the almost 1,500 highway deaths in Pennsylvania each year attributed to aggressive driving will be 50%.
Hence option A is correct.
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After a teaspoon of sugar has been stirred into a glass of water, no solid sugar can be seen. What happened to the sugar?
A.
The sugar disappeared.
B.
The sugar dissolved.
C.
The sugar melted.
D.
The sugar evaporated.
Answer:
B. The sugar dissolved
Explanation:
Answer:
B. The sugar dissolved
Explanation:
Sugar dissolves in water. It can't disappear, or evaporate because it's a solid.
What is the kinetic energy of a 620.0 kg roller coaster moving with a velocity of 9.00 m/s? Round to 3 significant
figures
0 2.790 J
5,580 J
025,100 J
050,200 J
Answer:
I think C
Explanation:
kinetic energy formula: 1/2mv^2
1/2(620kg)(9m/s)^2
1/2(620kg)(81m/s)
1/2(50220)
KE = 25110 J
20 POINTS.
URGENT HELP AND PLEASE EXPLAIN.
Student A states that when she sits down on a chair, she is exerting a force on the chair and that is all that happens. Student B states that when she sits on a chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair Which student is correct and why?
Answer:
i think its student b (d)
Explanation:
it might be student b cuz every action creates an equal and opposite reaction
Student B states that when she sits on the chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair because of newton's third law. Hence, option D is correct.
What is newton's third law?The third law of Newton asserts that when bodies interact, they exert forces that are equal in size and directed in the opposite direction. Another name for the third law is the law of reaction and action. This law is crucial for understanding issues with static balance, where all pressures are in balance, but it also remains true for bodies moving at a constant or accelerated speed.
It doesn't only use bookkeeping methods; the forces it represents are actual forces. For illustration, a book laying on a table exerts downward pressure equal to the weight of the book on the table. The table produces an equal and opposite force on the book in agreement with the third law.
Therefore, student B is correct that because of Newton's third law there is an equal and opposite action and counteracts the student's so that neither move.
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relationship between voltage, resistance and current in a circuit
Answer:
V = I×R
where -
V = potential difference across
I = current flowing in the circuit
R = Equivalent Resistance in the circuit
Answer:
Answer:
V = I×R
where -
V = potential difference across
I = current flowing in the circuit
R = Equivalent Resistance in the circuit
Explanation:
A sound wave generated by a musical note has the characteristics presented
in the table. What is the missing value?
Answer:
The answer is A. 6.3
Explanation:
I took AP EX quiz.
The missing value of the wavelength of air for the given values of wave speed and the frequency is 6.3.
What is wavelength?The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.
Wavelength λ = v/f
where v is the speed of wave = 346 m/s
Cordless phones use a frequency of 55Hz , then the wavelength will be
λ = v/f
λ = 346 m/s / 55 Hz
λ = 6.3 m
Thus, the missing value of wavelengths of the air is 6.3.
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Beer producers and bread bakers depend on types of yeast to respirate anaerobically to make their products.
True
False
Answer:
True
Explanation:
For each of the variables, make a hypothesis.
1. Egg Size: As I break. the size of the egg, it will be likely to the drop height, the egg will be
2. Drop height: As I likely to break. 3. Landing Surface: (write your own statement here, think about the surface and what might be important about it that would increase or decrease the likelihood that the egg will break)
There is a data table on the next page. Be sure to conduct your trials in an organized manner to allow for the data table to be of maximum use to you in answering the questions.
Answer:
Hope this helps :)
Explanation:
Let's start b writing down coordinates of all points:
A(0,0,0)
B(0,5,0)
C(3,5,0)
D(3,0,0)
E(3,0,4)
F(0,0,4)
G(0,5,4)
H(3,5,4)
a.) When we reflect over xz plane x and z coordinates stay same, y coordinate changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.
A(0,0,0)
Reflecting
A(0,0,0)
B(0,5,0)
Reflecting
B(0,-5,0)
C(3,5,0)
Reflecting
C(3,-5,0)
D(3,0,0)
Reflecting
D(3,0,0)
b.)
A(0,0,0)
Moving
A(-2,-3,1)
B(0,-5,0)
Moving
B(-2,-8,1)
C(3,-5,0)
Moving
C(1,-8,1)
D(3,0,0)
Moving
D(1,-3,1)
A 1000-kg car traveling with a speed of 35 m/s skids to a stop in 25m. Determine the average force applied to the breaks. If it took 3.2s to stop, who much power was generated by the breaks?
Answer:
1. 24500 N.
2. 191406.25 watt
Explanation:
From the question given above, the following data were obtained:
Mass (m) of car = 1000 Kg
Initial velocity (u) = 35 m/s
Distance (s) = 25 m
Final velocity (v) = 0 m/s
Time (t) = 3.2 s
Force (F) =?
Power (P) =?
Next, we shall determine the acceleration of the car. This can be obtained as follow:
Initial velocity (u) = 35 m/s
Distance (s) = 25 m
Final velocity (v) = 0 m/s
Acceleration (a) =?
v² = u² + 2as
0 = 35² + (2 × a × 25)
0 = 1225 + 50a
Collect like terms
0 – 1225 = 50a
– 1225 = 50a
Divide both side by 50
a = – 1225 / 50
a = –24.5 m/s²
1. Determination of the force.
Mass (m) of car = 1000 Kg
Acceleration (a) = –24.5 m/s²
Force (F) =?
F = m × a
F = 1000 × –24.5
F = –24500 N
The negative sign indicate that the force is in opposite direction to the motion of the car.
2. Determination of the power
Force (F) = 24500 N
Distance (s) = 25 m
Time (t) = 3.2 s
Power (P) =?
Next, we shall determine the energy.
Energy = force × distance
Energy = 24500 × 25
Energy = 612500 J
Finally, we shall determine the power. This is illustrated below:
Power = Energy /time
Power = 612500 /3.2
Power = 191406.25 watt
