A. Distance . . . . . No. Distance is a scalar quantity. It has no direction.
B. Speed . . . . . No. Speed is a scalar quantity. It has no direction.
C. 30 m/s . . . . . No. 30 m/s is a speed without a direction, and I just told you that speed is a scalar quantity.
D. 9.8 m/s² down . . . YES ! It has a size AND a direction. It's a vector.
Vector quantities are physical quantities that differ from one another in that they have both magnitude and direction. The right answer is D.
What are Vector quantities?Vector quantities are physical quantities that differ from one another in that they have both magnitude and direction. Force, Displacement, momentum, torque, velocity, and acceleration are some examples.
A vector quantity is one with both magnitude and direction. As a result, the vector quantity choice is 9.8 m/s² down. This is due to the fact that this choice has a magnitude of 9.8 and a direction of down.
Hence, the correct option is D.
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Which types of waves requires matter to carry energy? electromagnetic waves only mechanical waves only electromagnetic and mechanical waves longitudinal and electromagnetic waves
Answer: Mechanical waves
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.
Answer:
Mechanical waves
Explanation:
edge 22'
What three colors can be combined to produce any color within the visible spectrum
Answer:
red, green, and blue.
Explanation:
The primary colors of light that combine to produce any color within the visible spectrum are red, green, and blue.
0
Which of the following can you conclude about a particle labeled
Check all that apply.
O A. It has one electron.
OB. It has one neutron.
I C. It has one nucleon.
O D. It has one proton.
E. It is negatively charged.
OF. It is an alpha particle.
O G. It is a beta particle.
Answer:
B and C
Explanation:
The given symbol [tex]_{-1}^{0}e[/tex] denotes an electron. An electrons has neglecting mass and has one unit of negative charge. Thus, option A is correct.
What is an electrons?An electron is a subatomic particle. the other subatomic particles that constitutes an atom are neutrons and protons. neutrons and protons are located inside the nucleus and electrons are revolving around the nucleus through circular paths of fixed energies.
Electrons are having negative charge and protons are positively charged particles. For an atom the number of protons and electrons are the same. Therefore, an element in its atomic state is neutral.
Neutrons are neutral. However both neutrons and protons are having significant mass compared to an electrons. Hence, the representation of electrons include zero mass and -1 charge. Hence, option A is correct.
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Which statement best describes monsoons? They force cool, moist air from oceans to rise. They are winds that blow in the opposite direction of a normal wind. They bring heavy rain in the winter and in the summer. They influence precipitation as wind moves near a mountain.
Answer:
They are winds that blow in the opposite direction of a normal wind
Explanation:
Answer:
B.) They are winds that blow in the opposite direction of a normal wind.
Explanation:
it's correct trust
Help me please, help
Answer:
455,000 Pa
Explanation:
PV = nRT
If n is constant:
PV / T = PV / T
(101,325 Pa) (718 mL) / (273 K) = P (175 mL) / (26 + 273) K
P = 455,000 Pa
Based on the free-body diagram, the net force acting on this wheelbarrow is {blank} N.
Answer:
diagram?
Explanation:
Answer:
-150
Explanation:
I just did it on EDGE2020, and it's 100% correct! Please heart and rate if you found this answer helpful.
Please help, I need you, please help me
Answer:
14 mL
Explanation:
Ideal gas law:
PV = nRT
If n is constant, then:
PV / T = PV / T
(0.819 atm) (17.9 mL) / (273 + 28) K = (0.99 atm) V / (273 + 13) K
V = 14 mL
When very electronegative atoms, like oxygen, bond to atoms with a lower
electronegativity, like hydrogen, what's the result?
O A. The oxygen atom becomes strongly positive.
O B. The oxygen atom becomes strongly negative.
O C. The hydrogen atom becomes partially positive.
O D. The hydrogen atom becomes partially negative.
Answer:
Explanation:
B the oxygen atom becomes strongly positive
and
C HE HYDROGEN ATOM BECOMES PARTIALLY POSITIVE
PLS MARK MY ANSWER AS THE BRANLIEST
A person with a mass of 15 kg is walking uphill at a velocity of 2 m/s. What is the walker's
momentum?
A) 15 kg-m/s
B) 30 kg-m/s
C) 10 kg-m/s
D) 13 kg-m/s
Answer:
30kg-m/s
Explanation:
momentum = mass x velocity
PLS ANSWER REALLY EASY! WILL MARK BRAINLIEST.
State 4 differences (at least 3) between period and groups in the periodic table
Explanation:
They are;
The vertical columns of periodic table is called group and the horizontal rows of periodic table is called periods.The valance electron of all elements in the same group are the same but in periods the valance electron of elements in the same period increases from left to righr.The size of atoms increases top to bottom. but in case of periods the size of atoms decreases from left to right.Metalic reactivity increases and non metalic reactivity decreases from top to bottom. but in periods metalic reactivity decreases and non metalic reactivity increases from left to right.hope it helps...
Help me please, MathPhys be my hero :)
Answer:
T = 261 K
T = -12.2°C
Explanation:
PV = nRT
If P and n are constant:
V / T = V / T
2.75 L / (273.15 + 21) K = 2.44 L / T
T = 261 K
T = -12.2°C
Research and discuss the aurora borealis in
terms of electric charges, magnetic fields,
and forces. Which times of the year are best
for seeing the northern lights, and where are
the best places to view them? Explain your
answers. Also identify links to good images. If
you've ever seen the aurora borealis,
describe your experience and note the time
and place that you saw it.
Answer: the best times to see it would be from 10 pm to 1 am, meaning when the night skies are dark and clear. The best months to see it would be from April to late August. Whereas the best places in the world to view them would be closer to the arctic circle, this includes Canada, Alaska, Iceland and Greenland.
Explanation:
Hope this helps
Auroras are created by disruptions in the magnetosphere induced by the solar wind. The greatest times to see it are between 10 p.m. and 1 a.m.
What is aurora borealis?Auroras are created by disruptions in the magnetosphere induced by the solar wind. The paths of charged particles in the magnetospheric plasma are altered as a result of these disruptions.
These particles, primarily electrons, and protons fall to the upper atmosphere.
The greatest times to see it are between 10 p.m. and 1 a.m. when the night skies are dark and clear. It is recommended to visit between April and late August.
The greatest spots to see them are closer to the arctic circle, which encompasses Canada, Alaska, Iceland, and Greenland.
Hence the greatest times to see it are between 10 p.m. and 1 a.m.
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What's true about the elliptical path that the planets follow around the sun?
A)
A line can be drawn from the planet to the sun that follows the same curve as the
ellipse.
B)
A vector can be drawn from the center of one planet to the center of an adjacent
planet.
C)
A line can be drawn from the planet to the sun that sweeps out equal areas in equal
times.
D)
A scalar can be measured from the angle that the planet travels relative to the sun's
orbit.
help pls 30 points need help
Answer:
C
Explanation:
Answer:
I believe the answer is C.
Explanation:
1) (c)Describe how you would use the apparatus and what readings would you take?
I need the answer only for the '' c'' part
Answer:
A
Explanation:
Which of the following is an accurate statement? A. Step-up voltage transformers have fewer turns in the primary that in the secondary winding. B. aC generators produce current that's pulsating but always remains positive C. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming collage to a higher voltage D. DC generators produce current with a voltage that changes from positive to negative
Answer:
Option A is an accurate one.
Explanation:
A transformer being considered as a step-up transformer during which the performance (supplementary) voltage becomes stronger than that of the input (main) impedance of it. This kind of transformer reduces the electrical output to constantly keep the product input as well as power consumption equivalent.The other provided alternative is not related to the information provided there. So the response to the above seems to be the correct one.
what are the physical changes on water
How many hydrogen atoms are there in the following compound: 4CHA (2 points)
Select one:
a 4
b. 8
c. 12
d. 16
Answer:
4
Explanation:
The number 4 that is infront of the CHA(4CHA) means to say that there are 4C 4H and 4A
Tip:the number infront of a equation is call the coefficient
Ice sinks in methanol, but floats on water. From this we can conclude: A The density of ice in methanol must be different from that in water. B The density of water must be less than the density of methanol. C The density of ice must be greater than the density of water. D The density of methanol must be less than the density of water.
Answer:
D The density of methanol must be less than the density of water.
Explanation:
Ice sinks in methanol, so the density of ice is greater than the density of methanol.
Ice floats in water, so the density of ice is less than the density of water.
Since the density of ice is the same in each case, the density of methanol must be less than the density of water.
ρ_methanol < ρ_ice < ρ_water
"How does mass affect thermal energy transfer?
Answer:
The greater the mass of a substance the more thermal energy. The thermal energy of a substance depends on the temperature and mass of that substance.
Explanation:
Answer:
Explanation:
If two objects have the same mass, the object with the higher temperature has greater thermal energy. Temperature affects thermal energy, but temperature isn't the same thing as thermal energy. That's because an object's mass also affects its thermal energy.
help me pls help me pls
Answer:
a ) 19,536.72 J,
b ) ( About ) 84°C
Explanation:
a ) We can solve this problem assuming that the dishwater remains a constant 78°C the entire duration.
Q = mass of the glass [tex]*[/tex] specific heat of the glass
The mass of the glass is given by 401 g, the specific heat by 840 J / kg [tex]*[/tex] C. Respectively the change in temperature would be the difference between the temperature of the dishwater, and that of the glass. As we want the units in Joules, we need to first convert the 401 g ⇒ kilograms.
401 g = 401 / 1000 kg = 0.401 kg,
Q = 0.401 kg [tex]*[/tex] 840 J / kg 19,536.72 J
b ) We know that the specific heat capacity of water is 4.184 J / g [tex]*[/tex] C. As the final temperature will be common between each substance, we can make their respective heat absorbed, the same. Note that the heat capacity is given in J / g
0.023 kg = 0.023 [tex]*[/tex] 1000 = 23 g,
0.18 kg = 180 g
[tex]- ( 180 )( 4.184 )( x - 93 ) = 23( 4.184 )( x - 14 )[/tex],
[tex]-753.12x+70040.16=96.232x-1347.248[/tex],
[tex]-753.12x=96.232x-71387.408[/tex],
[tex]-849.352x=-71387.408[/tex],
[tex]\frac{-849.352x}{-849.352}=\frac{-71387.408}{-849.352}[/tex],
[tex]x=84.04926\dots[/tex]
The final temperature will be about 84°C
What has resulted in significant climate changes?
A. Plate tectonics
B. Doppler effects
C. Water pollution
Answer:A
Explanation:glass window allow light in but trap the heat inside
A magnifying glass uses a convex lens of focal length 5.25 cm. When it is held 5.00 cm in front of an object, what magnification does it create? pls help
Answer:
21
Explanation:
Which of the following pure elements exist as liquids at normal Earth temperatures?
Answer:
The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg).
help me please, help me
for the question w the coffee cup and the dishwasher: 19,536.72 J
for the question w the 3 pots of boiling water: They all have the same temperature
for the question w the copper: 103.84 Celsius
(Not sure what the other 2 pictures are about but good luck)
Why does precipitation occur after water condenses in clouds?
Answer:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water
Explanation:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth. If a cloud is colder, like it would be at higher altitudes, the water droplets may freeze to form ice.
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Which choice most accurately defines resistance and voltage of a circuit?
Resistance can be defined as the potential difference between two points in a circuit, while voltage is the amount of electrons moving through a point in a circuit every second.
Voltage can be defined as the potential difference between two points in a circuit, while resistance is the amount of electrons moving through a point in a circuit every second.
Voltage can be defined as the potential difference between two points in a circuit, while resistance opposes the flow of electrons in a circuit.
Resistance can be defined as the potential difference between two points in a circuit, while voltage opposes the flow of electrons in a circuit.
Answer:
Resistance can be defined as the potential difference between two points in a circuit, while voltage is the amount of electrons moving through a point in a circuit every second.
Explanation:
Which is equal to a temperature of 20°C?
20°F
68°F
36°F
32°F
A temperature of 20 degree Celsius is equal to 68 degree Fahrenheit temperature. Therefore, option b is correct.
What are temperature units ?Temperature is a physical unit which measures the overall heat of an object. The SI unit of temperature is Kelvin (K) and the commonly used unit is degree Celsius (°C).
Other unit of temperature is Fahrenheit (°F). These units can be interconverted between each other with the specific relation between them.
We know that zero degree Celsius is 32 Fahrenheit . Let T be the temperature in degree Celsius,
then, (T° × 9/5) + 32 = T in °F.
Given, temperature = 20 °C.
This temperature can be converted to °F as follows:
(20 °C × 9/5) + 32 = 68 °F.
Therefore, 20 °C is equal to a temperature of 68 °F.
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A ball is thrown directly downward with an initial speed of 8.05m/s, from a height of 30.2m. After what time interval does it strike the ground?
Answer:
2.9 seconds
Explanation:
The time we must take is positive since it has a valid physical answer, The negative one stands for traveling to the past something still we are unable to do.
When do we use v=2s/t and what does that equation mean?
Answer:
This can be used to find out the speed of the returned journey. The equation means speed = returned distance ÷ time.
Explanation: