Answer:
A. 25kmB. 15kmExplanation:
In this problem, we are expected to solve for the total distance covered by the person, and the person's displacement.
a) what is his distance?
this can be gotten by summing up all the individual distances covered by the person
total distance= 15+10
total diastance= 25 km
b) what is the person's displacement?
the displacement is the distance measured away from a point
this can be gotten by subtraction the final distance/point from the initial distance/point
displacement= 25-10
displacement= 15km
A load of 800 N is lifted using a block and tackle having 5 pulleys. If the applied effort is 200 N, calculate
i. Mechanical advantage
ii. Velocity ratio
iii. Efficiency
iv. Output work if load is lifted 5m high.
v. Input work
Explanation:
Load=800N
Effort=200N
1. Mechanical Advantage = LOAD/EFFORT
= 800N/200N
= 4
2 Velocity Ratio = no. Of pulleys =5
3. Efficiency = Mechanical advantage / velocity ratio × 100%
= (4/5)×100%
=80%
4. output work= load×load distance
= 800N × 5m
= 4 × 1000J
5. Efficiency = (output work/input work) ×100%
Or, 80% = (4000J/input work) ×100%
Or, 80%/100% = 4000J/inputwork
Or, 4/5 = 4000J/inputwork
Or, input work =4000J × 5/4
Input work = 5×1000J
I hope it helped! ;-)
Answer:
I got the same answers.
Explanation:
I agree with the first person respone.
What is the acceleration of a car that slows down from 25.0 m/s to 10.0 m/s in 30 seconds? The car is traveling south.
Why water is not used as a thermometric liquid?
Answer:
Explanation:There are many reasons why water is not used as a thermometric liquid (or is less preferred), chief among which is its transparency. It is thus comparatively harder to make any readings with it. It also has a lower boiling and higher freezing point compared to most liquids.
If you are facing north, then east is to your
Answer:
The real answer is right
Explanation:
If a boat travels 20 km in 3 h due north, what is the boat’s average velocity?
Answer: 6.66666667 or 6.66 km per hour
Explanation: (velocity = distance÷time) or (v=d÷t)
PLZ HELP TIMED TEST
Which would be most useful for overcoming the disadvantage of using ores?
using public transportation
recycling aluminum products
buying paper instead of plastic
minimizing electricity usage
Answer:
recycling aluminum products
Explanation:
I I took this test hope this out and on the test I got this correct
A car accelerates from rest to 90m/s in 3 seconds. What is the acceleration and how far did it travel?
Answer:
Explanation:
1.)acceleration= final velocity-initial velocity/time
90m/s-0m/s /3seconds
=30m/s^2
2.) distance= speed*time
90m/s*3seconds
=270m
A torn T-shirt was found in the back seat of a suspect's car. Two pieces of torn cloth were found at the scene of the crime. Can the two pieces be individualized to the T-shirt? Explain.
Answer:
Yes you can
Explanation:
Match the tears found on the individual pieces with the individual holes seen on the shirt
Which is always true in a closed system?
Acceleration is not constant.
Mass is not conserved.
Momentum is conserved.
Velocity is constant.
Answer:
The correct option is momentum is conserved
Explanation:
A closed system is a system that is independent/free of external factors/force and does not exchange matter with its surrounding. Since a close system is free of external factors/force; acceleration is constant in it, mass is conserved in it and there will be changes in velocities of objects in the closed system.
This question actually seeks to test our knowledge of the law of momentum. The law of conservation of momentum states that the momentum of a closed system is conserved.
C: Momentum is consevered
Astronauts who traveled to the moon were able to float slightly as they walked along its surface. Why were the astronauts able to do this? The weight of the astronaut on Earth is less than his weight on the moon. The mass of the astronaut on Earth is less than his mass on the moon. The weight of the astronaut on Earth is greater than his weight on the moon. The mass of the astronaut on Earth is greater than his mass on the moon.
Answer: The weight of the astronaut on earth is greater than his weight on the moon.
Explanation:
The reason I got this answer is because the astronaut will have the same mass on the moon as he does on earth. Also the weight of a person or object is determined by gravity. So since the moons gravity isn’t as strong as earths gravity the astronauts are lighter in terms of weight, and this is how they slightly float.
The weight of the astronaut on Earth is greater than his weight on the Moon. The third option is correct.
What is gravity?The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.
The Earth has the acceleration due to gravity, g = 9.81 m/s², Moon has the acceleration due to gravity 6 times less than that of Earth.
Astronauts who traveled to the Moon were able to float slightly as they walked along its surface. The astronauts were able to do this because they have the same mass on the Moon as he does on Earth.
The weight of a person or object is determined by gravity. Since, the Moon's gravity isn’t as strong as Earth's gravity. So, the astronauts slightly float on Moon.
The weight of the astronaut on Earth is greater than his weight on the moon.
Thus, the third option is correct.
Learn more about gravity.
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An organism ingests a toxin that damages the mitochondria of its cells.
Which function of the mitochondria might be inhibited in the cell?
Choose 1 answer:
(Choice A) A Producing sugar from sunlight
(Choice B) B Converting energy stored in sugar to ATP
(Choice C) C Creating proteins
(Choice D) D Disposing of damaged cell parts
What is the distance a bike travels at 38 km/he for 4.5 seconds?
Answer:
2.36m/s
Explanation:
first you have change 38km/hr into m/s
then divide your answer with 4.5
What is the momentum of a 3 Kg ball that is traveling at 9 m/s to the left?
Answer:
Explanation:
momentum =mv
p=mv
given mass=m= 3 kg
given velocity=v=9 m/s
therefore p is
p=mv
p=3*9
p=27 kgm/s
name the fundamental units involved in pascal
Explanation:
Hey there!
Here,
Pascal is a unit of pressure.
[tex]pressure = \frac{f}{a} [/tex]
Now, As per the formula the units are:
kg, m and s^2.
Hope it helps...
When testing water for chemical impurities, results are often reported as bdl, that is, below detection limit. The following are the measurements of the amount of lead in a series of water samples taken from inner-city households (in parts per million): 5, 7, 12, bdl, 10, 8, bdl, 20, 6 Which of the following statements can we be sure is true? (a) The mean lead level in the water is about 10 ppm. (b) The mean lead level in the water is about 9 ppm. (c) The median lead level in the water is 7 ppm. (d) The median lead level in the water is 8 ppm. (e) Neither the mean nor the median can be computed because some values are unknown.
Answer:
The median lead level in the water is 7 ppm.
Explanation:
Convert 1215 m to km.
Answer:
Answer:
it is 12.15 km
Explanation:
1215 km ÷1000
=12.15
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The flow of air from land to a body of water is called a _______________________.
The distance time graph of a body is a straight line parallel to the time axis. What
information does the graph convey regarding the motion of the object?
Explanation:
The object is not moving, because the distance is a constant value regardless of the time value.
When removing heavy objects that may change the center of gravity of a vehicle ________. Group of answer choices
Answer:
______________________________
use tall safety and position hoist arms
 Match the vocabulary word to its definition
Answer:
PROTON - A positively charged particle located in the nucleus of an atom./ ELECTON CLOUD - The area of the atom surrounding the nucleus where electrons can be found. / ELECTRON - A negatively charged particle that orbits the nucleus of an atom. / NUCLEUS - The central part of the atom containing protons and neutrons. / NEUTRON - A neutral particle located in the nucleus of an atom.
Explanation:
The answers are:
PROTON - A positively charged particle located in the nucleus of an atom.ELECTRON CLOUD - The area of the atom surrounding the nucleus where electrons can be found.ELECTRON - A negatively charged particle that orbits the nucleus of an atom.NUCLEUS - The central part of the atom contains protons and neutrons. NEUTRON - A neutral particle located in the nucleus of an atom.What is a nucleus in the atom?The nucleus is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric charge.
Learn more about the nucleus of an atom here: https://brainly.com/question/13533596
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Which statement describes an energy measurement?
There are no statements provided for my me to choose from, but i'll try.
Here's what I've got for ya:
1 Joule (J) is the MKS unit of energy, equal to the force of one Newton acting through one meter. 1 Watt is the power from a current of 1 Ampere flowing through 1 Volt. 1 kilowatt is a thousand Watts. 1 kilowatt-hour is the energy of one kilowatt power flowing for one hour.
Prob. not that helpful, sorry, but I can't read your mind to understand what the statements were, sorry.
Hope this is at least kinda helpful!
Can someone please help me. I think it D but I wanna make sure kk and thank you What is the main purpose of an scientific investigation A) to persuade with bias B) to teach an lesson C) to form an opinion D) to test a hypothesis
Answer: I believe it to be D.
PLEASE HELPP MEEE
5. While you're ice-skating with your friends, you push off from one end of
the rink and slide forward. Based on Newton's first law of motion, what
is true?
A. You will lose your balance and fall over before you reach the middle of
the ice rink
B. You will continue to slide across the ice until a force makes you stop or
change direction
C. The force of gravity will make you keep your velocity until your friends
make you stop
D. The size of your ice skates will determine how quickly or slowly you
travel across the ice
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Answer:
B
Explanation:
Newton's 1st law of motion is anything that is at rest remains at rest and anything in motion remains in motion so you will continue to slide until you come into contact with the opposite wall or another force.
water in a cup and a kettle can have the same temperature even though the quantities are different . give reasons
Answer:
The reason is because both are exposed to a virtually infinite heat sink, due to the virtually infinite mass and of the surrounding environment, compared to the sizes of either the cup or the kettle such that the equilibrium temperature, [tex]T_{(equilibrium)}[/tex] reached is the same for both the cup and the kettle as given by the relation;
[tex]\infty M_{(environ)} \times c_{(environ)} \times (T_2 - T_1) = m_{1} \times c_{(water)} \times (T_3 - T_2) + m_{2} \times c_{(water)} \times (T_4 - T_2)[/tex]
Due to the large heat sink, T₂ - T₁ ≈ 0 such that the temperature of the kettle and that of the cup will both cool to the temperature of the environment
Explanation:
When The north end of earths axis is tilted toward the sun, what will North America experience? Choices, 1. More indirect rays and shorter days 2. More indirect rays and longer days 3. more direct rays and shorter days 4. more direct rays and longer days
Answer:
day 4
Explanation:
it more direct rays nd it's longer days
Under most conditions, except ________ change, the resistance of an object is a constant and does not depend on the amount of the voltage or the amount of current passing through it.
Answer:
Temperature change
Explanation:
A person can be _____ to disease due to long-term malnutrition
Answer:
Abnormal or excessive fat accumulation
Explanation:
Malnutrition refers to getting too little or too much of certain nutrients. It can lead to serious health issues, including stunted growth, eye problems, diabetes and heart disease. Malnutrition affects billions of people worldwide
If several negative charges surround a large positive charge, the total force on a far away charge is reduced. What is this effect called
Answer:
this effect is called SCREENING
Explanation:
When a positive charge is surrounded by several negative charges at a long distance, an apparent decrease in the positive charge is observed, this effect is called SCREENING and is noticeable in multielectronic atoms
This effect is responsible for the decrease in ionization energy in the larger atoms.
PLEASE HELP ANSWER THIS WORKSHEET IT'S DUE TODAY WILL GIVE BRAINLIEST BALANCED AND UNBALANCED WORKSHEET
Answer:The net force for A. Is 2 and the resultant motion is up
B. NET force: 2 resultant motion: left
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C. Net force: 3 Resultant motion: Left
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D. Net Force: 7 Resultant motion: right
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E. Net Force:0 resultant motion: NO MOTION
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F. NET Force: 3 resultant motion: Down
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G. NET FORCE: 10 resultant motion: up
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H. Net force: 3 Resultant motion: left
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I. Net force: 50 Resultant motion: right
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J. NET FORCE: 75 Resultant motion: down
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K. Net force :200 Resultant motion: Right
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L. force: 0 resultant motion:No motion
Explanation:
Marcus is on a train that travels 20 and takes 5 seconds to slow to 10 .
How would Marcus correctly calculate the acceleration?
Answer:
-2
Explanation:
v0=20
v=10
t=5
a=(v-v0)/t=(10-20)/5=-2