Given :
A 1200 kg car travelling at 45 m/s slams on its breaks and slides to a stop.
If the coefficient of kinetic friction between the car and the road is 0.85 .
To Find :
How far the car slides.
Solution :
Acceleration is given by :
[tex]ma = \mu_kmg\\\\a = \mu_kg\\\\a = 0.85\times 10\ m/s^2\\\\a = 8.5\ m/s^2[/tex]
Distance covered is :
[tex]2as=u^2-v^2\\\\s = \dfrac{u^2-v^2}{2a}\\\\s=\dfrac{45^2-0^2}{2\times 8.5}\\\\s=119.12\ m[/tex]
Therefore, distance covered is 119.12 m.
Hence, this is the required solution.
Determine the components, the magnitude and the angle (counter-clockwise with respect to the positive x axis) of the resultant vector, R = B + C. Given: 0 Vector B: magnitude = 5.00 units, angle = 115 . 0 Vector C: magnitude = 4.00 units, angle = 255 .
Answer:
Explanation:
We shall represent vector B and C in terms of i and j .
B = 5 cos115 i + 5 sin115 j
= -2.11 i + 4.53j
Similarly
C = 4 cos255 i + 4 sin225 j
= -1.04 i -3.86 j
R = B + C
= -2.11 i + 4.53j -1.04 i -3.86 j
= -3.15 i + .67 j
magnitude of R
= √( 3.15² + .67² )
= √( 9.92 +.45 )
= 3.22
Angle Ф
TanФ = - .67 / 3.15
= - .21
Ф = - 12⁰
= 180 - 12
= 168 degree counterclockwise from positive x axis.
Siruis, the brightest star in the night sky, has a luminosity of 22. This means that Sirius: A, B, C, D QUESTION
A: developed 22 years before the sun
B: is 22 times farther from Earth than the sun
C: gives off 22 times more energy than the sun
D: is 22 times bigger in size than the sun
Answer:
i think C
Explanation:
please answer asap its important
Answer:
It is the green answer.
Explanation:
Please mark brianliest.
Connie flew from Phoenix to flagstaff, a distance of 180 miles at a constant speed of 180 miles per hour. She then returned to the same airport at a cj stand speed of 90. Miles per hour. What was connies average speed in miles/ hour
Answer:
Average Velocity = 120 mi/h
Explanation:
First we need to calculate the time taken by Connie to complete first half from Phoenix to flagstaff. So, we use:
s₁ = v₁t₁
where,
s₁ = distance from Phoenix to flagstaff = 180 miles
v₁ = speed of travel from Phoenix to flagstaff = 180 mi/h
t₁ = time taken to travel from Phoenix to flagstaff = ?
Therefore,
180 miles = (180 m/h)t₁
t₁ = 1 h
Now, we calculate the time for the return trip
s₂ = v₂t₂
where,
s₂ = distance from flagstaff to Phoenix = 180 miles
v₂ = speed of travel from flagstaff to Phoenix = 90 mi/h
t₂ = time taken to travel from flagstaff to Phoenix = ?
Therefore,
180 miles = (90 m/h)t₂
t₂ = 2 h
Now, we find total time:
t = t₁ + t₂
t = 1 h + 2 h
t = 3 h
and the total distance was:
s = s₁ +s₂
s = 180 mi + 180 mi
s = 360 mi
So, the average velocity will be:
Average Velocity = s/t
Average Velocity = 360 mi/3 h
Average Velocity = 120 mi/h
A student connects AA batteries, that have a total voltage of 6.0 V, to light up a light bulb to create a series circuit. The circuit has a resistance of 50 Ω. How much current (A) flows through the circuit?
image
A.
0.03 A
B.
0.12 A
C.
75 A
D.
300 A
Answer:
0.12A
Explanation:
v=ir
I=v÷r
6÷50=0.12A
how are electrical current measured
Answer:
ammeter
Explanation:
hope this helps
What would happen if you put a material between each marble? Newton's Cradle
Answer:
Explanation:
Momentum is the mass of a moving body times its velocity. It can be transferred from one object to another
How long does it take (in seconds) a 80,000 W motor to do 3,000,000 J of work?
what are erthpuaks and why do thay hapen
Answer:
earthquakes are violent ruptures that happen in the earth that causes a giant ravine and they happen when the plates of earth separate
Which type of lens produces diverging rays?
A) Concave Lens
B) Convex Lens
C) Concave Mirror
D) Flat Mirror
Answer:
The fact that a double concave lens is thinner across its middle is an indicator that it will diverge rays of light that travel parallel to its principal axis. A double concave lens is a diverging lens.
The greater an objects mass... The?
A) the less gravity it has
B) the greater the gravity it has
C) it’s gravity dosent change
D) the less weight
Answer:
B
can i be brainlyest
Explanation:
Newton's third law of motion involves:
A) one force acting on one object
B) a force pair acting on two different objects
C) a force pair acting on one object
D) unbalanced forces acting on many objects
Answer:
B
Explanation:
There are a pair of forces acting on the 2 interacting objects
You're welcome <3
A man has a weight of 85 kg what is his weight
A. 833 N
B. 85 N
C. 724 N
D. 145 N
Answer:
A)833N
Explanation:
weight=9.8x85=833N
I hope it helps
What Is The Definition Of Friction?
When carrying passengers up to the second floor, an escalator does 3,000 Nm of work. The time it takes the
escalator to move to the second floor is 6 seconds. The power of the escalator is
Nm/s.
Answer:
500Nm/s
Explanation:
500
this is the Plato answer!!!!!!
2. A go-cart travels once around a circular track with a radius of 200m. What is its
displacement?
A)200 m
B)1256.64 m
C)100 m
D)0 m
Answer:
ggggggg
Explanation:
Identifying Mechanical Energy Which image shows both potential and Kinet energy Α Α Α
Answer:
What is Kinetic and Potential Energy? In Physics, energy is used to refer to an ability to do work. Energy exists in various forms. This includes Gravitational energy, Chemical energy, Radiant energy, Mechanical energy, Sonic energy, Thermal energy, Nuclear or atomic energy, Magnetic energy and Electrical energy amongst many others.
Explanation:
Answer:
Um show me a picture or show me the image so I can Give you answer in the comments
Explanation:
Imagine that a loudspeaker is producing a quiet tone with a low pitch. How will its vibrations change:
a. if the pitch of the note becomes higher?
b. if the note becomes louder?
Lizard able to run in ceilings and walls.why?
Answer:
because of their web feet
Explanation:
oke
Answer:
Reptiles have an enormous number of extremely minuscule hairs on the stack of their feet called setae. These little cushions subsequently radically increment the surface zone and come in close contact with the surface on which the reptile is creeping, so the Van der Waals forces kick in.
Explanation:
Hope this helped!
Sienna made a chart listing the steps that describe how a four-stroke heat engine operates.
COM
Step
1
Name
intake
2
ignition
Description
piston moves down and fuel-air mixture
enters cylinder
spark plug fires and causes combustion,
leading to gas expansion
piston moves up and temperature of gas
increases
piston moves up, pushing burned gas
through exhaust valve
3
compression
4
exhaust
Which best describes Sienna's error?
o The descriptions for intake and ignition should be switched with one another.
O During compression, temperature does not increase, it decreases.
O Compression happens before ignition, so it should be step 2.
O The piston moves down, not up, during the exhaust step.
Answer:
C
Explanation:
Answer:
c
Explanation:
e2020
Can you hellp me please
Answer:
the answer is C
Explanation:
because the moon has to be in front of the sun hope this helps
Explanation:
may be (C) is the correct answer .
A candle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax. Which is the most important property of covalent compounds that makes them useful for making candle wax? a low boiling point a low melting point a high boiling point a high melting point
Answer:
the answer is a low melting point
Explanation:
on edge
Low melting point is the most important property of covalent compounds that makes them useful for making candle wax.
A molecule created by covalent bonding whereby the atoms possess one or much more pair of valence electrons is referred to as a covalent compound. Covalent compounds or ionic compounds are the two groups into which chemical compounds are often divided.
Ionic compounds are composed of atoms or molecules that have gained or lost electrons, causing them to become electrically charged. Ionic compounds are created when ions with opposing charges come together, typically when a metal interacts with a nonmetal. Low melting point is the most important property of covalent compounds that makes them useful for making candle wax.
To know more about covalent compound, here:
https://brainly.com/question/30420584
#SPJ7
Please Help!! This is very tough for me. Try you best to answer these problems!!Pleaseee
Answer:
everyone else does this to me so lol
Explanation:
Answer:
1. 9 m/s/s
2. 33 m/s
3. 5 m/s/s
4. 9.6 m/s
Explanation:
What is the purpose of radio waves?
Answer:
Explanation:
The prime purpose of radio is to convey information from one place to another through the intervening media (i.e., air, space, nonconducting materials) without wires. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form.
At which position is the Southern Hemisphere experiencing winter?
A. A
B. B
C. C
D. D
Answer:
A
Explanation:
At C, it's summer in the southern hemisphere due to it receiving the most amount of sunlight that, at A, earth is tilted so that the northern hemisphere receives the most amount of sunlight (making it winter for the southern hemisphere)
express the relation between m2 , cm2 , mm2 and km2
Answer:
1 Square meter (m2) is equal to 10000 square centimeters (cm2). To convert square meters to square cm, multiply the square meter value by 10000.
Explanation:
!!!!Has anybody done the Lab report : Thermal Energy Transfer on edg? For physics
2 pages of data
Answer: the only thing I can't give you is the lab report because I haven't done it yet i dont want to lol.
Explanation:
i got a bunch of answers so if my answers are correct im putting them here
Is CO2 is a molecule or a element or a compound
Answer:
Compound
Explanation:
Answer:
Compound
Explanation:
Its molecules consist of one carbon atom joined to two oxygen atoms. If you have more than one element chemically bonded, it is a compound.
20 g of water (specific heat of water is 4.18 J / g °C) undergoes a temperature change from 25° C to 20° C. How much heat energy moved from the water to the surroundings?
Answer:
418J
Explanation:
Given parameters:
Mass of water = 20g
Specific heat capacity of water = 4.18J/g°C
Initial temperature = 25°C
Final temperature = 20°C
Unknown:
Amount of heat lost to the surroundings = ?
Solution:
The amount of heat lost to the surrounding is the same as the quantity of heat needed to take down the temperature of the water.
Now, to solve this problem, use the mathematical equation below;
H = m c (T₂ - T₁)
H is the amount of heat
m is the mass
c is the specific heat capacity
T is the temperature
1 and 2 are initial and final states.
Now insert the parameters and solve;
H = 20 x 4.18 x (20 - 25)
H = -418J
The quantity of heat the moved from water to the surrounding is 418J
Someone help with this also