Answer:
12 km/hr
Explanation:
Speed= Distance/Time
Answer:
12km/h
Explanation:
average speed= Distance covered /time taken
average speed=2km/20minutes
=but 1 minutes is 60 seconds
=2km/60minutes
=12km/h
A 50Kg girl jumps off a 5-meter-high diving board. What is her kinetic energy right before she
hits the water?
A. 0 J
B. 25 J
C. 1225 J
D. 2450 J
Answer:
D is the correct answer
Explanation:
Ek=m*g*h=50*9.8*5=2450
The kinetic energy right before she hits the water is 2450J. So, the correct option is D.
What is Kinetic energy?Kinetic energy is defined as the energy that is due to the motion of an object. If we want to accelerate an object, we must apply a force, by applying a force we need to do work. After the work is done, energy has been transferred to the object, and the object will continue to move with a new constant speed.
A 50Kg girl jumps off a 5-meter-high diving board.
We need to find the kinetic energy of the girl before she enters the water which means that the kinetic energy becomes equal to the potential energy such that,
P.E.=K.E. = mgh
where, m=mass of the object
g= acceleration due to gravity [tex](9.8m/s^2)[/tex]
h= height
So, K.E= 50* 9.8*5 = 2450 J
Thus, the kinetic energy right before she hits the water is 2450J. So, the correct option is D.
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DECISION MAKING SCENARIOS.docx
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DECISION MAKING SCENARIOS
DIRECTIONS: Read each scenario and then follow the steps to the DECIDE process to see what
you would do if you were placed in each situation.
Scenario #1: You are a freshman and an only child whose parents have demanding careers
and little time to spend at home. You are left home alone a lot and have friends over for parties
all the time. The parties can sometimes get out of hand, but so far, you haven't been caught.
Recently, your friends have challenged you to take them for a ride in your parent's car but you
don't have your license yet. However, you'd like to do it.
DEFINE THE PROBLEM:
EXPLORE THE ALTERNATIVES:
1.
Answer:
and what us the question
Temperature
Energy Input
The three states of matter are modeled in the heatind cu
curve seen here. Identify ALL of the changes that must take place for a
substance to change state, from a solid to a gas.
A)
Pressure increases
B)
Temperature increases
19
7
Particles spread apart
D)
Kinetic energy increases
E)
Particle motion increases
Answer:
Particles spread apart, temperatue increases, pressure increases
Explanation:
A truck slows from a velocity of 25 m/s to a stop in 70 m. What was the truck’s acceleration
v^2-u^2=2 x a x d
25^2-0^2=2 x a x 70
625-0=140 x a
625=140a
a=625/140
a=4.46 m/s^2
im not very sure but i think this is how you do this
Question 3 of 10
Which point on the standing wave is the result of the constructive
interference of two crests?
B
D
A. A
O O o
B. B
C. C
D. D
Answer:
It is option A
Explanation:
a p e x
Point A on the standing wave is the result of the constructive interference of two crests. The effect is the sum of the individual wave amplitudes at each site where more than one wave is present.
What is the interference of waves?The result of two or more wave trains flowing in opposite directions on a crossing or coinciding pathways. This phenomenon is known as the interference of waves.
When two wave pulses are traveling along a string toward each other. They meet, and the phenomenon is occurring, known as interference.
The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point known as crest.
Point A on the standing wave is the result of the constructive interference of two crests.
Hence, option A is correct.
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What type of electrical cord has a ground?
3 pronged cord
2 pronged cord
Explanation:
One prong is known as the hot wire, where the electricity comes in, while the second prong is the neutral wire and electricity leaves. Recall that a circuit must be made for electrons to flow. This means that electrons enters your house through the transmission wires and then the electrons leave along the same lines they entered (just along a different wire).
This set up describes a 2 pronged cord. Adding a third prong allows for a grounding to happen. In the event of an electrical surge, when too many electrons are flowing, disaster is likely to happen without some kind of safety features. The grounding prong allows electrons to seek the ground. You can think of it like a drain in a bathtub when too much water gets in the tub.
Answer:
3 pronged cord
Explanation:
A combination of the skill-related fitness components can determine one's
Please select the best answer from the choices provided.
True or false
Which statement is true about carbon?
A. All carbon is in the form of carbon dioxide.
B. Carbon can exist in many forms, but the total amount of carbon stays the same.
C. The amount of carbon in the cycle can increase or decrease based on the number of factories present.
D. Only living things release carbon dioxide into the atmosphere.
6
Answer:
B. Carbon can exist in many forms, but the total amount of carbon stays the same.
Explanation:
The true statement from the given choices is that carbon can exist in many forms but the total amount of carbon stays the same.
The amount of carbon in nature is fairly balanced and constant.
There are two main forms of carbon. Carbon can exists in organic formsIt can also exists in inorganic forms. These types of carbon takes different attributes and interacts with a wide range of atoms.Which of the following has the least momentum?
Answer:
A. 0.01 [kg] mass moving at 200 [m/s]
Explanation:
Momentum is defined as the product of mass by Velocity.
[tex]P=m*v[/tex]
where:
m = mass [kg]
v = velocity [m/s]
For the case A
[tex]P=0.01*200\\P=2[kg*m/s][/tex]
If we perform this same operation with the values of mass and velocity we see that the momentums will be greater than 2 [kg*m/s], therefore the lowest momentum is achieved with the values in case A.
Option A of the following has the least momentum.0.01 [kg] mass moving at 200 [m/s] has the least value of momentum.
What is momentum?The measurement of mass in motion is called momentum. Momentum is equal to its mass multiplied by its velocity. Mathematically it is given as;
Momentum = Mass x Velocity
Finding the momentum in each case we got that the value of the momentum in the case 1 is less than all the given following cases.
Option A of the following has the least momentum.0.01 [kg] mass moving at 200 [m/s] has the least value of momentum.
Hence,option A is correct.
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what is Force & how many types of Force express with example
Answer:
The force is pull or push acting on the body which tends to change its state of rest or of motion is called force.
There are two types of force:
1.Contact force
2. Non-Contact
A car of mass 1000 kg is travelling at 10 m/s. What is its kinetic energy?
Answer:
50,000
Explanation:
kinetic energy=1\2×mv^2
=1\2×1000kg×10×10
=50000
A flight attendant pulls her 70 N flight bag a distance of 318 m along a level airport floor at a constant velocity. The force she exerts is 41 N at an angle of 57° above the horizontal.
Complete question :
A flight attendant pulls her 70 N flight bag a distance of 318 m along a level airport floor at a constant velocity. The force she exerts is 41 N at an angle of 57° above the horizontal.
(a) Find the work she does on the flight bag.
(b) Find the work done by the force of friction on the flight bag.
(c) Find the coefficient of kinetic friction between the flight bag and the floor.
Answer:
7107 J ; - 7107 J ; 0.55
Explanation:
Given that :
Distance, d = 318m
Applied force = 41 N
θ = 57°
A.) Workdone = Force exerted along direction of motion
Workdone = applied Force * distance * cosθ
Workdone = 41 * 318 * cos57 = 7101.0037
Workdone = 7,101 J
B.) Workdone by force of friction on flight bag:
- 7,101 J (since the body moves at constant velocity)
C.)
Coefficient of kinetic friction (μ) = Frictional force / normal reaction)
μ = F / N
Frictional force, F = Workdone by friction / distance
F = 6200 / 318
F = 19.47N ;
Ff = weight of Flight bag = 70 N
N = Ff - Fsinθ
N = 70 - applied Force sinθ
N = 70 - 41sin57
N = 70 - 34.385493
N = 35.614506
μ = 19.47 / 35.614506
μ = 0.5466873
Question 2 (5 points)
Evidence gathered by studying the composition and movement of distant
galaxies indicates that the universe expanded rapidly from a single small
point. The universe has continued to expand for over 13 billion years.
Which statement is in agreement with the current understanding of the
expanding universe?
A) All matter and energy were contained inside the small point.
B) Matter and energy came from dark areas of the universe and were attracted to the small point.
C) Matter and energy fell into the small point the same way a black hole attracts matter and energy
D) Matter was condensed into a single point until energy was attracted to the matter from dark areas of the universe.
Answer: A) All matter and energy were contained inside the small point.
Explanation: The theory that all matter and energy in the universe expanded from one condensed point (this is called the big bang theory) is the generally accepted explanation of the origins of our universe. Thought increasing amounts of doubt have been cast upon this theory in the last decade.
The figure shows the regions of the electromagnetic spectrum. Which of these statements is true?
A. X-rays are shorter than visible light waves.
B. Ultraviolet waves are longer than radio waves.
C. Visible light waves are longer than microwaves.
D. Infrared waves are shorter than ultraviolet waves.
Answer:
A. X-rays are shorter than visible light waves.
Explanation:
The correct choice from the given options is that x-rays are shorter than visible light waves.
X - rays falls into the category of short-wave radiations because they have short wavelength
Only gamma rays are shorter than x-rays. X-rays are highly energetic in nature and they have very high frequency. So, they have very short waves. The other choices are not correct.An object is moving in a straight line at a constant speed. A resultant force begins to act upon the object. State the ways in which the force may change the motion of the object
Answer:
accelerate / increase speed OR decelerate / decrease speed OR stop B1
change direction / move in a curve o.w.t.t.e
Explanation:
accelerate / increase speed OR decelerate / decrease speed OR stop B1
change direction / move in a curve o.w.t.t.e
A 2.5 kg block starts with a speed of 3 m/s, goes down a 4 m hill, and then slides up a new hill but stops when it is only 1.5 m high.
a) How much work was done by friction?
b) If there was no friction, how high could the block have slidden without stopping?
Answer:
See the answers below
Explanation:
This problem can be solved by means of the law of conservation of energy, which tells us that the energy between two points is conserved, that is, remains the same.
That is to say, we have two points, the point A where it starts to move and reaches the point B that is 1.5 [m] high, where it stops.
The key to solving this problem is to identify the types of energies at each point. At point A we have kinetic energy and potential energy where the block moves at speed 3 [m/s] at a height of 4 [m]. Whereas at Point B we only have potential energy, since the body is at a height of 1.5 [m], relative to the ground.
a)
Since between the displacement between points A and B there is a friction force, this friction force decreases the final energy in B, in this way the energy or work of the friction will have a negative sign.
[tex]E_{A}-W_{A-B}=E_{B}[/tex]
Now replacing in the above equation.
[tex](\frac{1}{2}*m*v^{2}+m*g*h_{1})-W_{1-2}=m*g*h\\(\frac{1}{2}*2.5*(3)^{2}+2.5*9.81*4)-W_{1-2}=2.5*9.81*1.5\\\\W_{1-2}=72.56[J][/tex]
b)
We must use the same equation, but this time eliminating the Working term due to friction.
[tex]E_{A}=E_{B}\\\frac{1}{2}*m*v^{2}+m*g*h_{A}=\ m*g*h_{B}[/tex]
[tex](\frac{1}{2}*2.5*(3)^{2}+2.5*9.81*4) =\ 2.5*9.81*h_{B}\\h_{B}=4.45 [m][/tex]
As we can see without friction the block can reach a higher height
An object, 5 cm high, is placed on the principal axis of a diverging lens of focal length 20 cm. The object is 30 cm from the lens.
Use a scaled diagram to locate the image formed by the lens.
Answer:
The answer is 70 cm
Explanation:
If you add All the numbers together, you receive an 55 cm then you add 15 because the points on the diagram also count.
Physics question......
Answer:
I think it is A or B, but more B as for John used 20 more net force. I recommend doing some research, sorry.
Answer:
I think the answer is B, I may be wrong...
Explanation:
Science; 4."Energy cannot be created or destroyed". Explain what this means and give an example to explain your
reasoning.
Answer:
matter
Explanation:
A pickle sits 8.0 cm from the center of a circular, rotating platter. The platter rotates such
that the pickle's tangential speed is 4.8 cm/s. What is the pickle's centripetal
acceleration?
(A) 0.36 cm/s
(B) 0.60 cm/s2
(C) 1.2 cm/s2
(D) 2.9 cm/s2
(E) 5.8 cm/s2
can be answered using momentum.
momentum = p
p1= mass1 * velocity1
p1 = p2
therefore
p1 = 6kg * 4m/s
p1 = 24kgm/s
p2=m2 * v2
24 kgm/s = 7kg * v2
v2 = 24 kgm/s / 7kg
v2= 3.42 m/s
Granite is mostly used in building work places whereas Gneiss is used for making tombstones, flooring, etc. Why do you think so? Explain how does this happen in nature
Answer:
Granite is durable, as it is hard and tough.
Gneiss has resistance to pressure and mechanical impacts
Explanation:
Granite is an igneous rock. It is mostly used in building works and construction because they are very durable. They are hard and tough and they have no internal structures.
Gneiss is used for flooring, ornamental stone, tombstones because of the fact that it shows resistances to pressure and also mechanical impacts.
how they are formed in nature:
In nature, granite is formed from the cooling down of hot molten magma and it's solidification before it reaches the surface of the earth.
In nature, gneiss is as a result of igneous rock or sedimentary rocks metamorphosing. Gneiss and granite are kind of similar. When subjected to great heat, granite becomes gneiss
which statement best describes the impact of space program on Florida
Answer:
B
Explanation:
did the test and i dont know the answer lol good luck bud gg
unit conversion
3 blarps = 7 glorps
8 glorps = 17 trangs
11 trangs = 5 slurps
2 slurps = 23 kilps
How many kilps are in 3 blarps?
Answer:
I don't know
Explanation:
There is not enough info to solve this problem...
a physical quantity is defined as mass per uint volume .what is its si unit.
1. Atmospheric pressure increases with
increasing altitude
increasing temperature
increasing humidity
ki
all of the other choice
Answer:
B. Increasing temperature.
Explanation:
Atmospheric pressure increases with increasing temperature because warm air causes the atmospheric pressure to rise.
Basically, when the molecules contained in air experience a collision, they usually exert forces on one other, and when these molecules become heated, they experience a quick and rapid motion leading to an increased rate of collision. Therefore, as more force is being exerted on the air molecules, the atmospheric pressure tends to rise or increase.
A dog starts at the origin and runs forward at 6m/s for 1.5s and then turns around to fetch the ball by running backward at 7m/s for 3s. If the dog runs back to the origin at 4m/s the how much time has elapsed between the start and when he returns with the ball
Answer:
Total time elapsed between the start and when he returns with the ball is 7.5s
Explanation:
From the question,
- The dog starts at the origin and runs forward at 6m/s for 1.5s. First, we will determine the distance covered while running forward.
From
Speed = Distance / Time
Distance = Speed × Time
Speed = 6m/s
Time = 1.5s
∴ Distance = 6m/s × 1.5s
Distance = 9m
That is, the dog covered a distance of 9m while running forward.
- The dog turns around and runs backward at 7m/s for 3s. Now, we will also determine the distance the dog covered backwards.
Distance = Speed × Time
Speed = 7m/s
Time = 3s
Distance = 7m/s × 3s
Distance = 21m
The dog's displacement from the origin is 21m - 9m = 12m
Now, to calculate how much time has elapsed between the start if the dog runs back to the origin at 4m/s, we will first determine the time the dog spent back to the origin and then add to the time spent for the first two distances.
To get back to the origin, the dog needs to cover 12m
From
Speed = Distance / Time
Time = Distance / Speed
Distance = 12m
Speed = 4m/s
∴ Time = (12m) / (4m/s)
Time = 3s
Therefore, the dog spent 3s to run back to the origin.
Hence, total time elapsed = 1.5s + 3s + 3s
Total time elapsed = 7.5s
A car accelerates from 10 m/s to 22 m/s in 6 seconds. What is the car’s average acceleration?
A. -2 m/s2
B. 12 m/s2
C. -12 m/s2
D. 2 m/s2
A
is to mutilpy to each other
When A car accelerates from 10 m/s to 22 m/s in 6 seconds, the average acceleration of the car is 2 m/s². Hence, option (D) is correct
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.
Initial speed of the car = 10 m/s.
Final speed of the car = 22 m/s.
Time internal = 6 seconds.
The average acceleration of the car is = change in speed/time interval
= (final speed - initial speed)/time interval
= (22 m/s - 10 m/s)/6 seconds
= 12 m/s / 6 seconds
= 2 m/s²
Hence, the average acceleration of the car is 2 m/s².
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need help in physices please help
What is the gravitational force of attraction between a 55 kg boy and a 40 kg girl if they are 0.10 meters apart?
Answer:
[tex]1.5\cdot 10^{-5}\:\mathrm{N}[/tex]
Explanation:
Newton's Law of Gravitation is given as:
[tex]F=G\frac{m_1m_2}{r^2}[/tex], where [tex]G[/tex] is gravitational constant [tex]6.67\cdot 10^{-11}[/tex] and [tex]r[/tex] is the distance between their centers of mass.
Therefore, the gravitational force between them is:
[tex]F=6.67\cdot 10^{-11}\frac{55\cdot40}{0.1^2}= \fbox{$1.5\cdot 10^{-5}\:\mathrm{N}$}[/tex] (two significant figures).
Which of the following best compares the atom of an element to an ion and an isotope of this element? *
1 point
An atom and its ion have the same charge but different masses. The isotope of an atom will have the same mass.
An atom, its ion, and its isotope will all have the same mass. The isotope of an atom will have a different charge.
The ion of an atom will have a different mass but the same charge. The isotope of an atom will have a different charge.
The ion of an atom will have a different charge but the same mass. The isotope of an atom will have a different mass.
Answer:
the ion of an atom will have a different charge but the same mass.The isotope of an atom will have a different mass
The statement that compares the atom of an element to an ion and isotope is: the ion of an atom will have a different charge but the same mass. The isotope of an atom will have a different mass.
WHAT IS AN ION AND ISOTOPE:An ion is a charged atom while an isotope is the atoms of an element with the same atomic number but different atomic mass. For example, Mg2+ is the ionic form of Magnesium while C-12 and C-14 are isotopes of carbon.Therefore, the statement that compares the atom of an element to an ion and isotope is: the ion of an atom will have a different charge but the same mass. The isotope of an atom will have a different mass.
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