Answer:
If the trains are moving at the same speed, the answer is A.
The clock in train B appears to be the same width and to run at the same rate. Option A is correct.
It is given that an observer on train A, which is moving close to the speed of light, views a clock in train B, which is stationary at the train station.
It is required to find how an observer would observe a clock in train B.
What would an observer on train A, which is in motion, view a clock in train B?If a person is in a moving train, then his body is also in a state of motion with respect to the train at the same rate. When the observer observes any object that is at rest then it does not change the shape or size of an object. Also an object appears to run a=t the same rate due to the relative velocity attain by the observer's train.
Relative Motion is
Relative motion is the speed or the motion of an object with respect to the moving or the stationary object.
Thus the clock in train B appears to be the same width and to run at the same rate.
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A car started its motion from rest and accelerated for 6 seconds, with the acceleration of 4 m/s2. Then it decelerated for 5 seconds, with the acceleration of -1.6 m/s2. What was the velocity of the car after 6+5 seconds?
I NEED LOTS OF HELP ON THIS
)A ball is hit straight up with an initial speed of 50 meters per second. What is the speed of the ball 3 seconds after it is hit? [Neglect friction.]
Answer:
The velocity of the ball after 3 seconds it is hit, is 20.6 m/s
Explanation:
Given;
initial velocity of the ball, u = 50 m/s
time of the upward motion of the ball, t = 3 seconds
The velocity of the ball after 3 seconds is calculated by applying the following kinematic equation;
v = u - gt
where;
g is acceleration due to gravity = 9.8 m/s²
v = 50 - (9.8 x 3)
v = 50 - 29.4
v = 20.6 m/s
Therefore, the velocity of the ball after 3 seconds it is hit, is 20.6 m/s
Which shows the correct pathway for nitrification? A. Ammonium Æ Nitrite Æ Nitrate B. Ammonia Æ Nitrite Æ Nitrate C. Ammonia Æ Nitrate Æ Nitrite D. Both A and
Answer:
Both Option A and B.
Explanation:
Both Option A and B are correct because Nitrification is the process whereby ammonium or ammonia is oxidized by ammonia oxidizing bacteria or nitrosofying bacteria like nitrosomonas, niitrosococcus into nitrite and also the process whereby nitrite is oxidized to nitrate by nitibacter bacteria
Distance vs. Time
80
70
60
B
50
Distance (m)
40
А
30
20
10
10 20
30 40 50
Time (s)
60
70
80
1. How far has the student walked in 25 seconds?
2. Describe the motion of the student from 25 seconds to 60 seconds.
3. How long did it take the student to walk 40 meters?
4. What is the independent variable?
5. What is the dependent variable?
Answer:
1. 50m
2. they are motionless
3. 20s
4. time
5. distance
URGENT! Why are vectors important to the concept of relative velocity?
Answer:
Explanation:
In physics, vectors are useful because they can visually represent position, displacement, velocity and acceleration. When drawing vectors, you often do not have enough space to draw them to the scale they are representing, so it is important to denote somewhere what scale they are being drawn at.
A rocket is shot out of a navy battleship to test a new rocket. It takes 16 seconds for the rocket
to reach its destination after leaving the barrel. If its final velocity was found to be 200 m/s,
then what was the rocket's acceleration?
A. 8m/s squared
B. 12 m/s squared
C. 12.5 m/s squared
D. 16m/s squared
Which types of rocks (igneou, sedimentary, metamorphic) tend to have crystalline textures? How does this texture form?
Answer:
metamorpic rock
Explanation:
it has a crystallin textures
A tire is dragged behind a NON LIVING truck on the ground with a chain attached to the tire and the truck. what type of force is this?
Answer:
Kinetic Energy
Explanation:
If your talking about potential and kinetic energy then here's a example,
A hammer when raised up has potential energy (the energy of position or state) But when falling down has kinetic energy (the energy of motion)
You're taking your first dive in ALVIN (Fig 10.13) to witness a hot spot on the ocean floor. As you descend and arrive on site, what are your first impressions?
Answer:
Explanation:
The experience is magnanimous and wonderful when witnessing the hotspot site. It was a great feeling! I could witness the red hot lava oozing out to the ocean floor from the subsurface like water from a hot-spring, and immediately, a cooling effect occurs. At that current time, the gas was coming up in the form of gas bubbles. I believed there was a mini-volcano located inside the ocean! The scene was fascinating, just like inserting a red-hot metallic-iron ball into the cool water, thereby creating a fizzing of gas and the ball's immediate cooling. It was a remarkable experience of witnessing an underwater volcano with the erupting lava and its immediate cooling to form a solid material.
How many temporal lobes are located in the brain?
Answer:
There's 1 temporal lobe that's located in the brain.
Explanation:
Answer: There are 4 lobes in the brain
Explanation:
How is ice more reflective than water?
Answer:
In fact, ice is slightly less reflective than water. The reflectivity is related to the refractive index (in a rather complicated way) and the refractive index of ice is 1.31 while the refractive index of water is 1.33. The slightly lower refractive index of ice will cause a slightly lower reflectivity. In both cases, the reflectivity is about 0.05 i.e. at an air/water or air/ice surface about 5% of the light is reflected.
Explanation:
Answer:
In fact ice is slightly less reflective than water. ... The net result is that much more of the light is reflected from snow. So the difference isn't anything fundamental, it's just because water is continuous while snow isn't.
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On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
36.7097837 kilograms-force
Explanation:
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Which statement about polymers is true?
A. Polymers are substances that have relatively large molecules.
B. Oil and gas are the starting materials for making all polymers.
C. Fabrics such as cotton and silk are synthetic polymers.
D. All polymers are obtained from living organisms.
Answer:
The answer is (A) "Polymers are substances that have relatively large molecules."
Polymer, any of a class of common or synthetic substances made out of very large molecules, called macromolecules, that are products of less complex synthetic units called monomers. Polymers make up a considerable lot of the materials in living beings, including, for instance, proteins, cellulose, and nucleic acids. In addition, they constitute the premise of such minerals as diamond, quartz, and feldspar and such man-influenced materials as solid, glass, to paper, plastics, and rubbers.
Answer:
I hope this helps
Explanation:
Local winds and global winds are generally a result of which of the following?
O Earth's tilted axis.
O Unpredictable changes in the atmosphere.
O Variations in the energy received from the sun.
O Unequal heating of Earth's surface.
Answer: Unequal heating of Earth's surface
Explanation:
3. An object accelerates from rest, with a constant acceleration of 4.5 m/s, what will its
velocity be after 30 s?
An object accelerates from the rest, which means that the initial speed of the object is 0 m/s, so the final velocity after 30 seconds will be equal to 135 m/s.
What is acceleration?Acceleration refers to the rate of change in both speed and direction of velocity over time. When something moves slower or faster in a straight line, it is said to have been accelerated. So because direction is always shifting, motion on a circular accelerates even while the speed is constant. Both factors add to the acceleration for every other types of motion.
It is a vector quantity, since acceleration has a magnitude and a direction. Another vector quantity is velocity. The velocity vector change during a certain period of time, split by that period of time, is the concept of acceleration.
The given information in the question is,
Initial speed, u = 0 m/s
Time, t = 30 s
Acceleration, a = 4.5 m/s²
Use the equation of motion,
v = u + at
v = 0 + (4.5)(30)
v = 135 m/s
Therefore, the final velocity of the object will be 135 m/s.
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A soccer ball kicked with a force of 14.7 N
accelerates at 7.3 m/s2 to the right.
What is the mass of the ball?
Answer in units of kg.
Answer:
The answer is 2.01 kgExplanation:
The mass of the ball can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
where
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{14.7}{7.3} \\ = 2.01369863...[/tex]
We have the final answer as
2.01 kgHope this helps you
Answer:
The answer is 2.01 kg.
Explanation:
Use the clues provided to fill in the blanks. NOT ALL OF THE WORDS IN THE WORD BANK WILL BE USED!!
Also don't mind the numbers that are in the blanks...
You just need to fill in the blanks using the words provided in the word bank.
Thank you.
how many electrons would be in an atom of carbon that has six protons and six neutrons?
The gravitational force between two objects is F. If the mass of one of the two objects is tripled but nothing else has changed, what would the new force be in terms of F
A)F/9
B)6F
C)3F
D)F/3
Answer:
3F
Explanation:
Gravitational Force is directly proportional to the mass; thus if one mass is tripled then the force is triples as well.
In the “Little Prince,” the Prince visits a small asteroid called B612. If the asteroid has a radius of 20.0 m and a mass of 2.00 x 10^4kg, what is the acceleration due to gravity on the asteroid (G=6.67x10-11N m2/kg2)?
Answer:
[tex]g= 3.33\times 10^{-9}\ m/s^2[/tex]
Explanation:
Given that,
The mas of asteroid is [tex]2\times 10^4\ kg[/tex]
The radius of asteroid is 20 m
We need to find the acceleration due to gravity on the asteroid. The formula for this is given by :
[tex]g=\dfrac{GM}{r^2}[/tex]
Where G is universal gravitational constant
[tex]g=\dfrac{6.67\times 10^{-11}\times 2\times 10^4}{(20)^2}\\\\g=3.33\times 10^{-9}\ m/s^2[/tex]
So, the acceleration due to gravity on the asteroid is [tex]3.33\times 10^{-9}\ m/s^2[/tex].
What specific object do you think of when you hear "an object in motion"?
(Example: I think of a soccer ball on a soccer field!)
Answer:
I think of somone throwing a ball or a ball rolling off of a table.
Explanation:
A stone is projected vertically upwards with a velocity of 12ms'. Calculate or find:
a) How long it took the stone to reach its maximum height.
b) Maximum height reached by the stone.
Answer:
The acceleration of the stone will be -9.8 m/s^2, because of the acceleration of earth's gravity, the initial velocity will be 12 m/s, and the final velocity will be 0 m/s. Therefore, we can solve using a kinematic equation to solve the problems:
a)
Final Velocity = Initial Velocity + Acceleration * Time
0 = 12 + -9.8*t
-12 = -9.8*t
t = 12/9.8 ≈ 1.224
Therefore, the time is equal to 12/9.8 ≈ 1.2245 seconds.
b)
Displacement = (Initial Velocity + Final Velocity)/2 * Time
d = (12+0)/2*1.2245
d = 6*1.2245
d = 7.347
Therefore, the maximum height is approximately equal to 7.347 meters.
Which of the following most likely describes a Group 10 element?
O Good conductor of heat
O Gas at room temperature
O A member of the carbon group
O Poor conductor of electricity
Answer:
A. Good conductor of heat
Explanation:
The group 10 elements are a group of chemical elements as part of VIII elements and they include nickel, platinum, palladium etc. These group of chemical elements are all d-block transition metals, highly ductile and lustrous and are mostly white to light grey in color.
The statement which most likely describes a Group 10 element is that they are good conductor of heat because they have some of the chemical and physical properties of metals.
A student in Europe performs the same experiment, but the AC frequency there is 50 Hz. How different length of sensitized tape will he need in order to get 25 spark marks, compared to the length of your tape for the same number of marks? Give the result in centimeters.
Answer and Explanation:
The computation is shown below:
The ac frequency in the United States is 60 Hz
The ac frequency in Europe is 50 Hz
So,
Time for 25 spark in United stated is 25 ÷ 60 s
Time for 25 spark in Europe is 25 ÷ 50 s
Now
Tape length in United States is
= 0.5 × 9.8 × (25 ÷ 60)^2
= 0.85 m
= 85 cm
And,
Tape length in europe is
= 0.5 × 9.8 × (25 ÷ 50)^2
= 1.225 m
= 122.5 cm
So, As it can be seen that
= 122.5 cm - 85 cm
= 37.5 cm
Europe has 37.5 cm more than in the United States
A hockey puck slides across the ice at a constant speed.
Which of the following is true?
1. It is in equilibrium.
2. The puck is at rest.
3. The puck is moving and thus not in equilibrium.
4. None of these
5. The puck can be considered neither at
rest nor in equilibrium.
As a hockey puck slides across the ice at a constant speed, it is n equilibrium. The correct option is 1.
What is equilibrium?Chemical equilibrium is the condition in which both the products and reactants are prevalent in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
When a reaction and its reverse reaction proceed at the same rate, this is referred to as chemical equilibrium.
Both forward and reverse reactions occur as a system approaches equilibrium. The forward and reverse reactions are proceeding at the same rate in equilibrium.
It is in equilibrium because it achieves dynamic equilibrium by moving in a straight line at constant speed. The net forces are equal to zero.
Thus, the correct option is 1.
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Is the speed of water molecules different in hot
and cold water?
PLEASE help me with 1-8 !!
The displacement during the interval from t = 0 s and t = 4 s is 10 m 10 m 20 m 20 m 25 m 25 m 40 m 40 m cannot be determined without knowing starting point
Answer:
Cannot be determined
Explanation:
Given
Interval: 0s to 4s
Required
Determine the displacement
The given information (i.e. time interval) can not be used to determine the displacement of the body.
To solve for displacement, we need the starting point, the direction moved and the distance moved in each direction.
So, it's either the question is incomplete or the answer to the question is option (e) cannot be determined
What is the frequency of this wave?
O 1
)2.
O 3
o 4
Answer:
The frequency, represented by the Greek letter nu (ν), is the number of waves that pass a certain point in a specified amount of time. Typically, frequency is measured in units of cycles per second or waves per second. One wave per second is also called a Hertz (Hz) and in SI units is a reciprocal second (s−1).
A car is traveling at a constant speed of 24 meters per second when all of a sudden the driver notices a deer 60 meters in front of him. Given that he has a reaction time of 1.2 seconds and that he can slow down at a rate of 6 m/s2, does he hit the deer? If so, at what speed does he hit the deer?
Answer:
[tex] {v2 }^{2} - {v1}^{2} = 2a(x2 - x1)[/tex]
[tex] - {24}^{2} = 2( - 6)(x2)[/tex]
[tex]x2 = 48[/tex]
x2 is distance after slow down. now we should calculate distance of reaction time.
[tex]d = tv[/tex]
[tex]d = (1.2)(24) = 28.8[/tex]
d + x > 60 ==> he hits the deer. now calculate hit speed.
[tex] {v2}^{2} - {24}^{2} = 2( - 6)(31.2)[/tex]
[tex] {v2}^{2} = 201.6[/tex]