An automobile having a mass of 1100 kg initially moves along a level highway at 120 km/h relative to the highway. It then climbs a hill whose crest is 80 m above the level highway and parks at a rest area located there. Use a reference with kinetic and potential energy each equal to zero for the stationary highway before the hill. Let g = 9.81 m/s^2.
For the automobile, determine its change in kinetic energy and its change in potential energy, both in kJ. For the automobile, determine its change in kinetic energy, in kJ.
a. -8594
b. -663.1
c. -6.63x10^5
d. 663.1
Answer:
[tex]-6111.11\ \text{kJ}[/tex]
[tex]863.28\ \text{kJ}[/tex]
Explanation:
m = Mass of automobile = 1100 kg
v = Velocity of car = 120 km/h = [tex]\dfrac{120}{3.6}\ \text{m/s}[/tex]
h = Height of hill = 80 m
g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
Change in kinetic energy
[tex]KE=\dfrac{1}{2}m(u^2-v^2)\\\Rightarrow KE=\dfrac{1}{2}\times 1100\times (0-(\dfrac{120}{3.6})^2)\\\Rightarrow KE=-611111.11\ \text{J}[/tex]
Change in kinetic energy is [tex]-6111.11\ \text{kJ}[/tex]
Change in potential energy is given by
[tex]PE=mgh\\\Rightarrow PE=1100\times 9.81\times 80\\\Rightarrow PE=863280\ \text{J}[/tex]
The change in potential energy is [tex]863.28\ \text{kJ}[/tex].
A communications system transmits a message. The probability that the message will be received is p. To be confident that a message is received at least once, the system transmits it n times. If a message is received, the receiver turns off and does not turn back on.
a. Assuming all transmissions are independent, what is the PMF of K, the number of times the pager receives the same message?
b. Assume p=0.8. What is the minimum value of n that produces a probability of 0.95 of receiving the message at least once?
Answer:
Follows are the solution to the given points:
Explanation:
In point a:
In the PMF of K, that pager receives its same message number of times, that is [tex]=\tiny \binom{n}{k}p^{k} (1-p)^{n-k}[/tex]
In point b:
The possibility of getting number of cultural at least once in x:
[tex]\to 1-P(\text{not receiving it at all})\\\\\to 1-(0.2)x\\\\\to 1-(0.2)x>0.95\\\\\to (0.2)x<0.05 \\\\[/tex]
appling the [tex]\log[/tex]:
[tex]\to x>0.25[/tex]
The value x is equal to 3.
What are some sources of resistance? (Check all
that apply.)
worn or damaged cables
loose cable connections
weak springs on work clamps
painted surfaces
rusty tables
Answer:
All of them.
Explanation:
I take this class rn too and those are answers
What are the advantages to a quality
saw?
Merchandise without an expiration date like electronics, tools and home goods typically have a longer
Answer:
Shelf life.
Explanation:
In Business, an inventory is a term used to describe a list of finished goods, goods still in the production line and raw materials that would be used for the manufacturing of more goods in a bid to meet the unending consumer demands.
Simply stated, an inventory can be classified into three (3) main categories; finished goods, work in progress, and raw materials.
An inventory is recorded as a current asset on the balance sheet because it's primarily the most important source of revenue for a business entity.
Also, the three (3) main cost concept associated with an inventory are;
1. First In First Out (FIFO).
2. Last In First Out (LIFO).
3. Weighted average cost.
Shelf life can be defined as a measure of the length of time that a particular product could be kept or stored without it getting bad or becoming unsuitable for use by the consumers. Thus, the shelf life of a product is largely dependent on its expiration date.
Hence, merchandise without an expiration date like electronics, tools and home goods typically have a longer shelf life.
Resistance produces____
in a conductor.
•Gas
•Energy
•Heat
Answer:
The answer would be Heat
26 V is measured across a 220 Ω resistance. This means that resistor current equals ________. Group of answer choices 1.2 A 57 A 118 mA 5.7 A
What kind of plan or development of road can be done to avoid traffic?
Answer: Breakdown Lanes
Reason: With breakdown lanes when a car needs to stop it can go to the backdown lane and fix its issue.
What energy type is represented in the picture?
A. Electrical
B. Elastic
C. Gravitational
D. Thermal
What are the factors that influence the amount of elastic energy in an object? Select all
that are correct.
A. stretching
B. compression
C. hardness
D. mass
Answer:the answer is A B and C
A B and C
The more compact the body, the less friction, and the more mass the mass must have friction.
Obese children develop high blood pressure, heart disease, and Type II diabetes at a younger age than children of a healthy weight. true or false
a strut of length l has its ends built into a material which exerts a constraining couple equal to k times the angular rotation in radians. show that the buckling load p is given by the equation
[tex] \tan( \alpha )l \div 2 = p \div \alpha k \: \: and \: \: \alpha { \}^{2} [/tex]
[tex] \alpha [/tex]
Answer:
fxruwrisris84drid85d59s59e95etod
Explanation:
urzrjxrjxrjr
68dtudrusditxx4ixtiurzrjzruzurzjfzirzjrz
True or False; If I was trying to find the Voltage of my computer, and I was given the Watts and Amps it uses, I would use Watt's Law.
Answer:
true
Explanation:
I love jimin from bts but my future says that I'm a date someone called peter and I'm going to be as singer whith my bro and sis and other sis what should I do I want jimin
Answer:
Its just a quiz hopefully, so you're okay! :)
Explanation:
Answer:
you can collab with jimin if you are a singer!!!
you never know
Explanation:
Which physical quantity measures the rate at which an object’s velocity changes?
A.
force
B.
speed
C.
acceleration
D.
torque
Answer:
I think the answer is b speed
Explanation:
Print the two strings, firstString and secondString, in alphabetical order. Assume the strings are lowercase. End with newline. Sample output:
capes rabbits
Hai!
Please name what kind of Script your Using then I would love to help.
Java
C
C#
C++
Lua
JavaScript
HTML
Python
Which of the following is NOT a risky food:
a
Raw Meat
b
Uncleaned fruits & vegetables
c
Bread
d
All of the above
e
Soft Cheeses
i think it's c. bread.
Answer:I think raw meat because if you eat raw meat you get sick and get stomach aches so always when you cook meat it kill the bacteria
Explanation:what I'm trying to says is stay safe
True or False; The Neutrons in an atom have a neutral charge.
Answer:
true
Explanation:
if it is not true it is false
Answer:
False.
Explanation:
Neutrons have no charges.
Explain any five applications of computer modeling in beams.
Answer:
Explain any five applications of computer modeling in beams.
Explanation:
Please look at the attachments and help me with these questions
Answer:
there are no attachments
Explanation:
table saws you can use with __ or __ but not both at the same time
Answer:
wood or metal
Explanation:
sorry if incorrect
what are the relevance of report writing
Answer:Report writing consists of the history and facts of a project or of any kind of event. It is useful to record past history and an overall summary of decisions. Report writing helps to solve problems as a path. Writing a report will guide you in a way that will modernize details of the improvements and upcoming plans.
What is the advantage to the speed or
trigger clamp?
How is the art of orgami useful in science and technology?
I need help with this ASAP please. This is basic carpentry, I just missed the first half of the year so I am a little behind. Can somebody answer the two questions?
Answer:
the half answer is pretty easy just look at it really really good hope this helps..
Explanation:
Which of the following is not a step in a building’s life cycle?
evaluation
maintenance
demolition
resource extraction
Answer:
resource extraction
Explanation:
common sense
Faster air movement over an airfoil creates a _________ pressure field, which in turn allows lift.
a
Higher
b
Lower
Hai
Your answer will be A.
If you lower the Air Pressure your Object will Float Down ward. The Air Pressure allows it to Fly.
The pressure field created by faster air movement over an airfoil is; A: higher
What is pressure field?When the air hits the front of the wing, the air will flow in a steeper curve upward, than the bottom wing flow which will lead to the creation of a vacuum on top of the wing that pulls more air towards the top of the wing.
Finally, this air above does the same thing but it will move faster as a result of the vacuum pulling it in, and as such the vacuum now lifts the wing. Thus, Faster air movement over an airfoil creates a higher pressure field.
Read more about pressure field at; https://brainly.com/question/14468674
Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Consider a room whose air temperature is maintained at 24ºC throughout the year, while the walls of the room are nominally at 26°C and 16°C in the summer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a temperature of 32°C throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2·K.
Answer:
Hello your question is incomplete below is the missing part of your question
Determine Heat flux due to convection
answer : 16 w/m^2
Explanation:
Room temperature = 24°c
Room temperature during summer = 26°c
Room temperature during winter = 16°c
surface temp of person = 32°C
emissivity = 0.90
coefficient ( h ) = 2 W/m2.K
Determine Heat flux due to convection
Q" = h ( Δ T ) = coefficient * ( surface temp of person - room temperature )
= 2 * ( 32 - 24 ) = 16 w/m^2
Which of the following activities may involve the use of plant architecture?
A) crop rotation
B) companion planting
C) algal billion
D) raised gardening
Answer:
companion planting
Explanation:
i failed and saw all the correct answers
If a circuit has a total resistance of 10 ohms and has 30 volts DC applied
to it, what will the total current draw be for the circuit?
a) 300 amps
b) 3 amps
c) 30 amps
d) .333 amps
Answer:
b i think is the correct answer
Explanation:
it was a bit hard but i used a ohms calculator
u should try it. it will help
Current is defined as the flow of electrical charge carriers, which are often electrons or electron-deficient atoms. The correct option is B.
What is current?Current is defined as the flow of electrical charge carriers, which are often electrons or electron-deficient atoms. The capital letter 'I' is a typical sign for current. The ampere, denoted by A, is the standard unit.
The relationship between current(I), resistance(R), and voltage(V) is written as:
V = IR
Given circuit has a total resistance of 10 ohms and 30 volts. Therefore, the total current that can be drawn from the circuit is,
30 volts = I × 10 ohms
I = 30/10 amp
I = 3 A
Hence, the correct option is B.
Learn more about Current:
https://brainly.com/question/13076734
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