Answer:se obesrva ca indicele de refractie NU are unitate de masura, este adimensional. Se exprima print-un raport, de exemplu 4/3, 1,5 etc.
Explanation:
Write down what unit of time, you need to use for measuring
Challenging Questions
a. The beat of your heart.
b. The duration of one period of your class.
c. The time you take to travel from home to school.
Help if you understood pleas and rhanks
Answer:
the velocity is 4 ms, if it asked for change it be 0 m/s but its asking for velocity so option 4, 4m/s
Explanation:
The correct answer is Option 2: 2 m/s². The acceleration of the object at 8 seconds is 2 m/s². Note that the negative sign indicates that the acceleration is in the opposite direction of the velocity.
To calculate the acceleration of the object at 8 seconds, we need to look at the change in velocity over time (acceleration is the rate of change of velocity).
Given the graph, we can see that at 8 seconds, the velocity of the object is 6 m/s.
Now, let's find the change in velocity between 8 seconds and 10 seconds:
Change in velocity = Final velocity - Initial velocity
Change in velocity = 2 m/s - 6 m/s
Change in velocity = -4 m/s
Next, find the time interval between 8 seconds and 10 seconds:
Time interval = Final time - Initial time
Time interval = 10 s - 8 s
Time interval = 2 seconds
Now, calculate the acceleration:
Acceleration = Change in velocity / Time interval
Acceleration = (-4 m/s) / (2 s)
Acceleration = -2 m/s²
The correct answer is Option 2: 2 m/s². The acceleration of the object at 8 seconds is 2 m/s². Note that the negative sign indicates that the acceleration is in the opposite direction of the velocity.
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An object is moving initially with a velocity of 5.6 m/s. After 3.1 s the object's velocity is -2.7 m/s. What is the object's average acceleration during this time
Answer:
-2.68m/s²
Explanation:
To find acceleration use the formula:
acceleration = change in velocity ÷ time
change in velocity = -2.7 - 5.6 = -8.3m/s (final velocity - initial velocity)time = 3.1sSubstitute in the values:
acceleration = -8.3 ÷ 3.1
acceleration = -2.67741.. ≈ -2.68m/s²
Hope this helps!
Why can’t you compress gas but you cannot compress a liquid
A force of 20 N acts upon a 5 kg biock. Calculate the acceleration of the object.
Answer:
F=ma
Explanation:
Given required solution
F=20N a=? a=F/m
m=5kg a=20/5
a=4m/s^2
write two examples of machine which increases the speed of doing work
Answer:
Explanation:
Speed multipliers are useful when an object needs to move a further distance or at a higher speed. Some examples are wheels and axles and third class levers. Machines can be either simple or complex. Simple machines are machines that only use one type of machine, such as a lever or an inclined plane.
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calculate the volume of a spare with radius 7cm
Answer:
around 1436.76 cm^3
Explanation:
v = 4/3(3.14)7^3
v = 4/3(3.14)343
v = 4/3(1077.02)
v = 1436.02666667
round up
v = 1436.027
if you use pi, then the answer would be around 1436.76 cm^3
I need help please...
Answer:
the order is written in the attached image
Explanation:
A rainbow is seen in a rainy day. Describe its reason
Answer:
A rainbow requires water droplets to be floating in the air. That's why we see them right after it rains. The Sun must be behind you and the clouds cleared away from the Sun for the rainbow to appears.
Answer the question below and show all work.
Answer:
Explanation:7
8 a Name the bones that articulate (join together) in the knee joint
the shoulder joint
the hip joint
Answer:
The Femur and the Tibia
What do "Newton's apple" and the moon have in common?
Answer:
Both these motions are caused by the Gravitational force of earth.
Explanation:
Both these motions are caused by the Gravitational force of earth.
what do all forms of electromagnetic radiation have in common?
Answer:
All electromagnetic waves have two wavefronts, which are an oscillating electric field and an oscillating magnetic field.
Explanation:
A force is applied to a 2.9 kg mass and pro-
duces 2.7 m/s?
acceleration.
What acceleration would be produced by
the same force applied to a 6.2 kg mass?
Answer in units of m/s?
Answer:
5.8 or 5.77
Explanation:
I'm not sure
A car moving along a straight highway with speed of 126 km 1 h− to brought to stop within a distance of 200 m. how long does it take for the car to stop?
Answer: 11.43 sec
solution:
v2 – u2 = 2as
a = (v2 – u2)/2s
= (0 – 352)/(2 × 200)
= –1225/400
= –3.06 m/s2
v = u + at
0 = 35 – 3.06 × t
t = 35/3.06
= 11.43 sec
a proton, moving east, enters a magnetic field of a certain strength. because of this field the proton curves downward. what is the direction of the magnetic field?
Answer:
F = q V X B
Using the right hand rule (right hand screw) turn V into B to get direction of force which in this case is down
If V is east and F is down then one can see that B must be directed towards the south - turn V into B (south) and F will be directed downwards.
A ship left the dock and travelled north at 50km/hr for 2 hours then it turned west at 60km/hr for 3 hours. What is the net resultant displacement vector R
Answer:
resultant displacement = 20√1o6 km = 205912.6 m in the direction of western north.
Explanation:
assume that the ship started moving from A to B (north at 50km/hr for 2 hours) so the covered distance will be: 50*2 = 100 km
then it moves from B to C so the covered distance will be: 3*60 = 180 km
using Pythagoras, we get the resultant displacement = 20√1o6 km = 205912.6 m in the direction of western north.
A ball is accelerating down a hill. Which statement is true?
the potential energy and the kinetic energy both decrease
the potential energy and the kinetic energy both increase
the potential energy decreases and the kinetic energy increases
the potential energy increases and the kinetic energy decreases
Answer:
The potential energy increases and the kinetic energy decreases
in addition to studies of the body system of corals what studies in earth science might increased scientists understanding of an ability to predict coral bleaching
Answer: they could get a piece of the coral and run tests on it
Explanation:
5.) How could we have improved this activity to be more precise?
ball on ramp
Explanation:
I don't understand this question
could you please explain
Explanation:
Well ball on ramp .Which factors are affected?
Centre of massAcceleration due to gravity Mass of ball .Force appliedSo if we put the ball right above the centre of mass it can be best stabled
PLEASE HELP ME WITH EDGE UNIT TEST!!!! EARTH AND SPACE SCIENCE!!!!!
At which location would an object’s weight be the greatest?
on Pluto
on Earth
on the Sun
on the moon
Answer:
on Pluto or earth go witH u guts mine is always right hope this helps
what is concentration?
Answer:
The concentration of a chemical substance expresses the amount of a substance present in a mixture.
Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration is usually expressed in terms of mass per unit volume.
Answer:
In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: mass concentration, molar concentration, number concentration, and volume concentration.
NEED HELP!!!! 10 POINTS!!
Paralysis is often the result of severe spinal injuries. Why is this often the case?
A.
All movement begins in the spine and radiates through the body.
B.
The spine in the only part of the body that is directly connected to the brain.
C.
The spine houses much of the central nervous system, which controls movement.
D.
The bones in the spine cannot regenerate and grow, unlike other bones in the body.
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Due to paralysis, the result is severe spinal injuries. This is often the case because the spine houses much of the central nervous system, which controls movement. Hence, option C is correct.
What is Paralysis?You might become paralyzed, and unable to move on your own when something interferes with the nerve impulses that muscles receive from the brain. Strokes, spinal cord injuries, and neurological diseases like multiple sclerosis are among the common causes of paralysis.
When you are unable to move your muscles voluntarily, you are said to be paralyzed. Paralysis results from nerve system issues.
Muscles receive messages from healthy nerves. This causes the muscles to contract. When you’re paralyzed, or have paralysis, you can’t move certain parts of your body.
Hence, it concludes that option C is correct.
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Which of the following is a true statement about learning?
A. Learning does not result in lasting change.
B. Learning happens through experience or practice.
C. Learning does not enable a person to continue to do something.
D. Learning involves activities that happen automatically.
Answer:
B. learning happens through experience and practice.
An unknown mass is on a flat frictionless surface and a 2 kg object is attached to it with a string going over pulleyt mounted to the end of the table. Acceleration of the 2 kg object is 1.8 m/s^2. What is the mass of the object?
Answer:
Explanation:
F=ma
F in this case is the gravity acting on the 2kg object. Acceleration of gravity is 9.8 m/s^2. SF=ma, so
F = 2kg*(9.8 m/s^2) = 19.6 N
Now use this force to determine the mass of the object on the table:
F=ma
19.6 N (1N=kg*m/s^2) = m*(1.8 m/s^2)
m = 10.89 kg
If the activity of a source is 70 Bq after 2 years, and 35 Bq after 15 years. How long will be until the activity is 8.75 Bq?
Answer:
N = N0 e^-kt calling k the decay constant
70 = N0 e^-2 kt
35 = N0 e^-15 k
2 = e^(-2 + 15) k
.693 = 13 k
k = .0533
N0 = N e^kt
N0 = 70 e^(.0533 * 2) = 77.87
8.75 = 77.87 e^-(.0533 t)
ln .1124 = -.0533 t
t = -ln .1124 / .0533 = 41 yr
When does it have kinetic energy
NEED HELP!!! IF YOU ANSWER ALL QUESTIONS I WILL GIVE YOU BRAINEST!!!!! 15 POINTS!!!!
1. Alana wants to add some eccentric exercise to her routine. She has heard that pull ups are good, but she does not have a lot of upper body strength and thinks that is going to be too challenging. She wonders if she can start by just hanging on at the top with her chin above the bar and holding that pose to get the benefits. What is the BEST response to Alana?
A.
Any activity that works the arms is eccentric exercise.
B.
That might build strength, but it is not eccentric exercise.
C.
She will get all of the benefits because grasping the bar key.
D.
She needs to do something else as pull-ups are not eccentric exercise.
2. Trina has a family history of thyroid issues, and it has caused many of her family members to gain weight, which is a common side effect. She is worried that she may develop thyroid problems one day but does not think that exercise will help since it is a gland, not a muscle. She thinks that this means that it cannot be targeted and strengthened. What is the BEST response to Trina?
A.
Isometric exercises strengthen the thyroid gland.
B.
If a condition runs in her family, she will get it no matter what.
C.
There is very little that she can do to improve the health of her thyroid.
D.
It cannot be specifically targeted, but exercise will help it function better.
3. Amari has been exercising regularly and she is really starting to feel the benefits. Overall, she has more energy and just feels better about herself. She has started volunteering for things that she otherwise would have been too shy to do. Could this newfound confidence be a result of her good habits?
A.
Yes, she looks better, so she feels better.
B.
Yes, she is producing more testosterone.
C.
No, she has probably just matured a little.
D.
No, exercise does not have psychological effects.
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Answer:
1.A
2 .B
3 A
Explanation:
1.A eccentric excercises works the arms
2.B- if a condition runs in her family there are possibilities that she'll get it because it runs in the genes of her family
Wile E. Coyote is holding a "HEAVY DUTY ACME™ ANVIL" on a cliff that is 40.0 meters high. The Roadrunner (beep-beep), who is 1.0 meter tall, is running on a road toward the cliff at a constant velocity of 10.0 m/s. Wile E. Coyote wants to drop the anvil on the Roadrunner's head. How far away should the Roadrunner be when Wile E. drops the anvil?
Answer:
53.8
Explanation: I plugged it on the formula
Coyote should drop the anvil when the Roadrunner is 20.3 meters away from the cliff.
What is velocity?The velocity of the object is defined as the fraction of the displacement of the object over a period of time.
We can solve this problem by finding the time it takes for the anvil to fall from the cliff to the ground, and then using that time to find how far the Roadrunner has travelled during that time.
First, we need to find the time it takes for the anvil to fall from the cliff. We can use the equation:
d = 1/2 x g x t²
where d is the distance (40.0 meters), g is the acceleration due to gravity (9.81 m/s^2), and t is the time.
Solving for t, we get:
t = √(2d/g)
t = √(2 x 40.0/9.81)
t = 2.03 seconds
So it takes 2.03 seconds for the anvil to fall from the cliff to the ground.
During this time, the Roadrunner has travelled a distance equal to its velocity multiplied by the time:
distance = velocity x time
distance = 10.0 m/s x 2.03 s
distance = 20.3 meters
Therefore, Wile E. Coyote should drop the anvil when the Roadrunner is 20.3 meters away from the cliff.
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which of the following is an example of the law of multiple proportions?
The answer option which is an example of the law of multiple proportions is: B) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C.
The Law of Multiple Proportions is also referred to as Dalton's Law and it states that when two chemical elements combine to form more than one chemical compound, the masses (weights) of one chemical element that combine with a fixed mass (weight) of the other chemical element will always be in a ratio of small whole numbers.
According to the Law of Multiple Proportions, when two chemical elements combine to form two different chemical compound, the masses (weights) of one chemical element that combine with 1 gram of the other chemical element can be expressed as a ratio of small whole numbers.
For example, carbon and oxygen react to form either carbon monoxide and carbon dioxide.
Carbon monoxide (CO):
12 grams of C = 16 grams of O.
1 gram of C = 1.33 gram of O.
Carbon dioxide ([tex]CO_2[/tex]):
12 gram of C = 32 grams of O.
1 gram of C = 2.66 gram of O.
Ratio of oxygen (O) = 16:32 = 1:2 (Law of Multiple Proportions).
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Your question is lacking the necessary answer options, so I will be adding them here:
A. A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B. Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C.
C. Two different samples of table salt are found to have the same ratio of sodium to chlorine.
D. The atomic mass of bromine is found to be 79.90 amu.
E. Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.