Answer:
B
Explanation:
This is the discovery of redshift that led scientist to say the universeis still expanding
rpreting Heating Curves
Heating Curve of Substance A
Which segments show changes of state that absorb
heat? Check all that apply.
O B-C
F
600
O C-D
500
O D-C
400
D
E
OD-E
Temperature (Cº)
300
O E-F
B
200
C
100
A
D
Answer:
the answer is E-F
Explanation:
why is because the others are lines but E-F is curve
The left side of the armature in an electric motor is pushed down. when the current changes direction, how is the motion of the armature affected? it is pulled up on the left side. it is pulled up on the right side. it is pulled toward the commutator. it is pushed away from the commutator.
Answer:
It is pulled up on the left side. took the test
Explanation:
Which building material would provide the best surface for viewing a reflection?
Answer:
it is A fffgfhdshhsdsggsgssggsdggedgdgegggeeegeegegehe
A potato is launched from the ground at an 73 degree angle with a velocity of 48 m/s.
What maximum height will the potato reach? (Answer in meters)
Type your answer...
Answer:
107.4 meters
Explanation:
gravity is 9.8m/s^2
max height = (velocity squared times sin squared angle) ÷ ( speed of gravity times 2 )
max height = (48 squared times sin of 73 squared) ÷ ( 9.8 times 2 )
The linear speed of the earth's rotation is __________ at the north pole. Group of answer choices 1000 mph none of the remaining options 1200 mph zero
The Earth is rotating with the rotational speed. The linear speed of the earth's rotation at the North Pole is zero.
What is linear speed?The linear speed is when a particle is assumed to be moving in a straight line. The rate of change of distance with time is called linear speed.
The linear speed at the North Pole is
v = distance / time
At the North Pole, the distance around the Earth is zero. The rotation for 224 hrs.
v = 0 / 24 hrs
v =0 mph
Therefore, the linear speed of the earth's rotation at the North Pole is zero.
Learn more about linear speed.
https://brainly.com/question/13100116
#SPJ
What type of meter is connected in
parallel with a resistor in a circuit, and why?
• A. An ammeter, to measure potential difference
• B. A voltmeter, to measure potential difference
• C. A voltmeter, to measure current
O. D. An ammeter, to measure current
Answer / Explanation:
B
Potential difference is measured using a device called a voltmeter . Just like ammeters, some types have a pointer on a dial, but most have a digital display. However, unlike an ammeter, you must connect the voltmeter in parallel to measure the potential difference across a component in a circuit.
[tex] \textbf{What do you mean by Refractive Index ?}[/tex]
[tex] \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ [/tex]
[tex] \qquad \tiny{ \sf \: no \: \: classes \: \: today {}^{} . \: it \: feels \: so \: relaxing \: \sqrt{} }[/tex]
Rarefaction is the reduction of an item's density, the opposite of compression.Rarefaction is the reduction of an item's density, the opposite of compression.
Answer:
The Refractive Index (RI) is defined as the ratio of the speed of light in a vacuum to its speed in the sample medium.
Formula:-
[tex]n = \displaystyle{ \frac{c}{v} }[/tex]
Where,
c is the speed of light and v is the phase velocity of light.
physics 6
physics geniuses where r u need help!!!
------------------------
pls also check other questions!
Answer:
165.5
Explanation:
vrms × root 2= v max
Hence we get v maximum =165.5 V
An internal resistance of 5 ohm and a battery of 15 ohm is connected to a resistance of 20 ohm calculate the electric current
Answer:
.6 A
Explanation:
Battery 15 VOLTS
V = IR
V / R = I
15 / ( 5+20) = .6 amps
what is the difference between a free body diagram and a vector diagram?
Answer:
Free body diagrams are used to describe situations where several forces act on an object. On the other hand Vector diagrams are used to resolve (break down) a single force into two forces acting as right angles to eachother
Explanation:
Hope this helps !
Which is a difference between the Paleozoic and Mesozoic era?
O Animals lived in the water during the Mesozoic and on land in the Paleozoic.
O The first birds emerged in the Paleozoic era while mammals first emerged in the Mesozoic.
O Many different species of dinosaurs lived in the Mesozoic, but they all died off in the Paleozoic.
•
Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era.
Answer:
Option 4
Explanation:
The difference between the Paleozoic and Mesozoic Era is that animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic Era.
The Paleozoic is the first part of the Phanerozoic Era, and is followed by the Mesozoic Era, which is the second part.
The difference between the Paleozoic and Mesozoic eras is "Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era." The correct option is D.
What are the Paleozoic and Mesozoic eras?The Paleozoic era and Mesozoic era are two major divisions of geological time.
The Paleozoic era, also known as the "age of invertebrates," spanned from about 541 million years ago to about 252 million years ago. During this era, the first multicellular organisms evolved, and there was a rapid diversification of life forms. This era saw the rise of fish, amphibians, and reptiles, as well as the first forests and the development of early land plants. The Paleozoic era ended with a mass extinction event that wiped out about 90% of all marine species and nearly 70% of all land species.
The Mesozoic era, also known as the "age of dinosaurs," spanned from about 252 million years ago to about 66 million years ago. During this era, reptiles continued to dominate the land, and dinosaurs evolved and became the dominant terrestrial animals. This era also saw the rise of birds, the evolution of flowering plants, and the emergence of mammals. The Mesozoic era ended with a mass extinction event that wiped out the non-avian dinosaurs, as well as many other species of plants and animals.
Here in the Question,
Option A, "Animals lived in the water during the Mesozoic and on land in the Paleozoic," is not a correct difference between the two eras. In fact, animals lived both in the water and on land during both the Paleozoic and Mesozoic eras. The Mesozoic era is famous for the rise of the dinosaurs, which were primarily land-dwelling animals, while the Paleozoic era saw the rise of amphibians and the first land-dwelling vertebrates.
Option B, "The first birds emerged in the Paleozoic era while mammals first emerged in the Mesozoic," is also not a correct difference between the two eras. In fact, birds did not emerge until the Jurassic period of the Mesozoic era, while the first mammals are believed to have emerged during the late Triassic period.
Option C, "Many different species of dinosaurs lived in the Mesozoic, but they all died off in the Paleozoic," is not correct either. Dinosaurs first appeared during the Mesozoic era and dominated the terrestrial ecosystem for more than 150 million years before they went extinct at the end of the Cretaceous period. The Paleozoic era ended more than 100 million years before the first dinosaurs appeared.
Therefore, The correct option is D. Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era.
To learn about geologic time scale click:
https://brainly.com/question/29244390
#SPJ7
a car starts from 21 m/s and gets up to a velocity of 30m/s in a time of 36
seconds. what is the acceleration of the car
Answer: Acceleration is 0.25m/s^2
Explanation:
A passenger jet in the air increases its speed. Does the downward force of air on the top of the wings increase or decrease? Does the net lifting force of the air on the wings increase or decrease? Explain your answer
The downward force of air on top of the wings decreases. The net lifting force of the air on the wings increase. A passenger jet in the air increases its speed.
As a proton moves in the direction the electric field lines group of answer choices
As a proton moves in the direction of the electric field lines, it is moving from low to high potential and gains electric potential energy.
What are electric field lines?The imaginary lines are of an electric field such that the tangent drawn to it points in the direction of electrostatic force.
When a proton is moving along the electric field lines, it is gaining energy.
Thus, when a proton moves in the direction of the electric field lines, it is moving from low to high potential and gaining electric potential energy.
Learn more about electric field lines.
https://brainly.com/question/23970566
#SPJ
You really have a thing for screaming outside. So on a day where the speed of sound is 343 m/s you go outside and scream at a wall. It takes 0.5 s for you to hear your echo. How far away is the wall that you screamed at?
Sort the images based on whether there’s a force of attraction or repulsion between the magnets show.
Answer:
look at the explanation
Explanation:
the first one, 4th one and 6th one will go into repulsion and the others will go into attractive (hope this helps and Goodluck on any other questions)
DO YOU LIKE MY PHYSICS ESSAY?
Answer:
Yes
Explanation:
I love THAT SONG. And it is a good essay.
Answer: ( yes i do like your essay! )
I am breaking down in tears. /j
I should've expected this and i still fell for it
what best describes a reference fram?
Answer:
A reference frame is that frame to which the qualities of an object are related:
For instance - an object may described by - mass, speed, acceleration, size, etc,
It is important to remember that Newton's Laws of motion do not hold in accelerated reference frames -
Einstein's laws of special relativity are only true in frames that move with contant speed to one another
How does the change in the volume of air in the bubble affect the density?
Hey yall, can you help with this? First-person to answer gets brainiest + an additional 17 pts.
Answer:
(a) 217 Ra (b) 29 P
84 16
Explanation
(a) 221 Rn ---------------> 4 He + 217 Ra
86 2 84
the mass number is reduced by 4 while the atomic number is reduced by 2 since an alpha particle is emitted
(b) 29 P ------------------> 0 e + 29 P
15 -1 16
the mass number remains the same while the atomic number is reduced by -1 since a beta particle is emitted
To increase the potential energy of a barbell, work is done on the weightlifter. by the barbell. on the barbell. none of the above
The potential energy of a barbell is increased when it is lifted by the weight lifter and work is done on the barbell.
What is the meaning of energy?Energy is the ability to do work. We must note that the weightlifter does work in a gravitational field.
Hence, the potential energy of a barbell is increased when it is lifted by the weight lifter and work is done on the barbell.
Learn more about energy:https://brainly.com/question/1932868
#SPJ4
Define Impulse And Momentum
Plsss Answer Now I Need Now
Answer:
Impulse-The effect of force acting over time to change the momentum of an object.
momentum-The product of mass of a particle and its velocity.
How long does it take for light from jupiter to reach earth.
Answer:
35 to 52 minutes
Please mark me as the brainliest
Name one energy source that is used to make sure that we can provide energy consistently,even though demand varies during the day
Answer:
Water power, eg tidal and hydroelectricity , is reliable and predictable because of the Moon causing the tides and rainfall filling reservoirs. They can also be used to supply additional demand.
Explanation:
HOPE IT HELPS.
PLEASE MARK ME AS BRAINLIEST.
Describe earth’s orbit around the sun. Describe the orbits of the other planets.
Answer:
An ellipse with the Sun at one of the foci of the ellipse
Explanation:
Planets have elliptical orbits
Now, provide 2 things that has high mass and low mass stars have in common.
Answer:
Those common things which they both have are:i) They both start off with fusing hydrogen into helium.and ii) They both generate their energy by the process called nuclear fusion.((hope it is useful for u all))
This is a sever snowstrom with high winds and low visibility
Answer:
blizzard
Explanation:
A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility
Joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table. a 2-column table with 4 rows. the first column labeled step has entries 1, 2, 3, 4. the second column labeled command has entries, grip block, lift block 10 centimeters, hold for 20 seconds, release block. during which step does the robotic arm do work on the block? step 1 step 2 step 3 step 4.
Step 2 does the robotic arm do work on the block. Joshua programs a robotic arm to place a block in a box. a four-row, two-column table.
What is a robotic arm?A robotic arm is a type of artificial arm that may be programmed to do tasks similar to those of a human arm.
The arm can be the sum of the mechanism or part of a larger robot. Joints connect the manipulator's linkages, allowing rotational or translational motion.
By following the directions in the table, Joshua programs a robotic arm to place a block in a box. a four-row, two-column table.
The items in the first column labeled step are 1, 2, 3, and 4. Grip block, elevate block 10 cm, hold for 20 seconds, release block are the items in the second column labeled command.
Step 2 does the robotic arm do work on the block.
Hence,step 2 is the correct answer.
To learn more about the robotic arm refer:
https://brainly.com/question/14768119
#SPJ1
please answer this question
Hope you understand
Have a nice day
What is a electric charge
Answer:
Positive and Negative, commonly carried by charge carriers protons and electrons. Examples of the types of charges are subatomic particles or the particles of matter: Protons are positively charged. Electrons are negatively charged.
Explanation: ;)
electrostatic charge and symbolized q, is a characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.
