Given :
A 13.3 kg box sliding across the ground decelerates at 2.42 m/s².
To Find :
The coefficient of kinetic friction.
Solution :
Frictional force applied to the box is :
[tex]f = ma[/tex] ....1)
Also, force of friction is given by :
[tex]f = \mu mg[/tex] ....2)
Equating equation 1) and 2), we get :
[tex]\mu mg = ma\\\\\mu = \dfrac{a}{g}\\\\\mu = \dfrac{2.42}{9.8}\\\\\mu = 0.247[/tex]
Therefore, the coefficient of kinetic friction is 0.247 .
an aircraft is flying at height of 3400m above the ground.if the angle subtended at a ground observation point by the aircraft positions 10s apart is 30degree. what is the speed of the aircraft?
Answer: 588.9 m/s
Explanation:
Given that :
θ = 30°
Height, h = 3400m
Time, t = 10 seconds
From trigonometry ;
Tanθ = opposite / hypotenus
Tan 30 = 3400 / x
x tan 30 = 3400
0.5773502x = 3400
x = 3400 / 0.5773502
x = 5888.9727
Recall ;
Speed = Distance / time
Speed = 5888.9727 / 10
Speed = 588.897 m/s
Speed = 588.9 m/s
According to O*NET, what is the most common level of education held by Emergency Medical Technicians?
post-secondary certificate
associate degree
some college, no degree
bachelor’s degree
The answer is post-secondary certificate, I found that out because I got the answer wrong on edg 2020.
Answer:
post secondary certificate.
Explanation:
Answer:
post secondary certificate sorry that you got it wrong
Explanation:
Whailt's magnification
?
Answer:
Magnification is the degree to which an object is multiplyed to get it's image.
For example if an object size is 10cm an it's image size is 20cm then the magnification is 2, that is the image is twice the size of the object.
Hope that helps
Which two statements describe how ultrasound technology produces an image of a baby before it is born?
A. An image is created based on the frequency of reflected X-rays.
B. Body tissues absorb high-frequency sound waves, producing an image.
C. An image is created based on the amount of time it takes for a sound wave to return.
D. Tissues in the baby's body reflect high-frequency sound waves.
Answer:
C,D
Explanation:
an image is created based on the amont of time it takes for a sound wave to return
Tissues in the babys body reflect high-frequency sound waves
In ultrasound scanning, an image of internal organs is created based on the amount of time it takes for a sound wave to return.Thus, option C is correct.
What is ultrasound scanning?High-frequency sound waves are used in ultrasound imaging, also known as sonography, to view within the body. Real-time ultrasound imaging allows for the display of blood flowing via blood vessels as well as movement of the body's internal organs.
Contrary to X-ray imaging, ultrasonic imaging does not expose patients to ionizing radiation.A transducer (probe) is positioned either on the skin or inside a bodily orifice during an ultrasonic examination.
To allow the ultrasonic waves from the transducer to pass through the gel and into the body, a small coating of gel is placed to the skin.
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Robins are birds that sing to attract mates two male robins robin A and Robin B are both singing to attract females robin A had more songs which the females find more attractive which option is likely to happen
Answer:
The female birds find more attractive which option is likely to happen is discussed below in detail.
Explanation:
All About Robins and How to Attract Them - Natural Birds Unlimited | Wild Birds Unlimited. These birds are interested to inaugurate grasslands and gardens with seasoned underbrush and trees. While they consume a variety of pests and grains or seeds, it has been remarked that they can consume up to 5 meters of earthworms in a day.
How is social media changing the world as we know it?
Answer:
Social media has helped many businesses grow and promote itself, and has helped people find a better way to connect and communicate with one another. On the other hand, it's also provided many people with problems involving mental health, emotional insecurities, and waste of time
Explanation:
what they said is correct
I need help plzzzzz!!
Explanation:
can u tell me which language is that
if the car ha a mass of 1000 kilograms, what is its momentum (v=35m/s)
Answer:
The momentum of the car is 35,000 kg.m/s
Explanation:
Momentum
Momentum is often defined as mass in motion.
Since all objects have mass, if it's moving, then it has momentum. It can be calculated as the product of the mass by the velocity of the object:
[tex]\vec p = m\vec v[/tex]
If only magnitudes are considered:
p = mv
The car has a mass of m=1,000 kg and travels at v=35 m/s. Calculating its momentum:
p = 1,000 kg * 35 m/s
p = 35,000 kg.m/s
The momentum of the car is 35,000 kg.m/s
The momentum of the car is 35000 kgm/s.
MomentumLinear momentum, translational momentum, or simply momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.
If m is the mass and v is the velocity of an object, then the object's momentum p is given below.
[tex]p = mv[/tex]
Given that the mass of the car is m=1,000 kg and travels at v=35 m/s. The momentum is given below.
[tex]p = 1000 \times 35[/tex]
[tex]p = 35000 \;\rm kg m/s[/tex]
Hence we can conclude that the momentum of the car is 35000 kgm/s.
To know more about the momentum, follow the link given below.
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You want to go swimming, but there is no lifeguard at the beach right now. You are not a good swimmer. The safest thing to do in this situation is to
swim only where you are able to stand
swim only with a lifeguard present
swim with a flotation device
swim with a friend in deep water
Answer:
swim with flotation device
Explanation:
For Valentine’s Day, Sally received a helium-filled balloon at a party. On returning home she accidentally left the balloon in the car. Later she went to get the balloon and found it was partially deflated. After being in the house for an hour she noticed it was fully inflated again. Explain why this happened.
Answer:
If the temperature of the air in the balloon is less than the temperature of the air surrounding the balloon then the balloon will appear slightly deflated because of the difference in temperature.
As the temperature of the air in the balloon reaches the surrounding air temperature, then the balloon will appear to be fully inflated because the temperature of the air in the balloon is the same as the surrounding air temperature.
How much energy is needed to melt 5 g of ice? The specific latent heat of melting for water is 334000 J/kg.
Answer:
The needed energy to melt of ice is 1670 J.
Explanation:
Given that,
Mass of ice = 5 g
Specific latent heat = 334000 J/kg
We need to calculate the energy
Using formula of energy
[tex]Q=mL[/tex]
Where, m = mass
L = latent heat
Put the value into the formula
[tex]Q=5\times10^{-3}\times334000[/tex]
[tex]Q=1670\ J[/tex]
Hence, The needed energy to melt of ice is 1670 J.
How is temperature related to the motions of molecules?
Answer:
As the temperature increases, the kinetic energy of the molecules of the liquid increases.
Explanation:
An astronaut decides to perform an experiment to monitor how much weight he loses during his stay on the International Space Station. He weighs himself prior to takeoff, daily while on the space station, and again after returning to Earth.
Explain the following for 2 points each:
Identify what data from the weights he recorded should be considered in his experiment
For any weigh-ins that should not be used in his experiment, explain your reasoning
Explain the relationship between mass, weight, and gravity
Answer:
The first one is: His weight on the Earth before take-off and the weight after take-off back on Earth once he gets back should be recorded as his Independent variable and his dependent variable.
The second one is: If he gained the weight back that he had lost while on the trip then you should disregard them unless that was the weight he was when he weighed himself after he got back.
The Third one is: The mass of an object is the amount of matter it contains, regardless of its volume or any forces acting on it. … Gravity is a force that attracts objects toward the Earth. The weight of the object is defined as the force caused by gravity on a mass.
Explanation:
I took the quiz earlier. Hope this Helps you.
What do scientists hope to find? Why would that sort of thing be found inside Earth?
Answer:
Scientists will hope to find a lot of things. Such as lava, fossils, and landmarks.
Explanation:
i farted
Is this statement true or false?
A full moon occurs approximately three weeks after a new moon.
It would really help me if you would say why the answer is either true or false!
I think that it is true, but I'm not exactly sure. :)
The passing of a wave through a material
A. Absorption
B.transmission
C.reflection
Answer:
B: transmission
Explanation: Transmission of waves occurs when waves pass through a given point or medium. Sound waves are transmitted through solids, liquids, and gases therefore the answer is the transmission
The temperature is directly proportional to the speed of sound. Why?
First, we need to understand what we mean by sound and temperature. Sound is the vibration of particles traveling as a wave. Temperature is a measure of energy in a system of particles. A higher temperature means the particles have a higher energy, higher energy means they're moving around faster, and that faster motion makes them more capable of carrying sound waves.
Differences between fundamental and derived quantities
Answer: Below...
Explanation:
Fundamental Quantities: based and defined by the process of measurement... some examples are length, mass, time
Derived Quantities: can be defined through the fundamental quantities... some examples are velocity, volume, pressure
EX: volume (derived q.) can be measured by mass (fundem. q.)
Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration?
a) 35 km/h/s
b) 40 km/h/s
c) 10 km/h/s
d) 5 km/h/s
Answer:
c
Explanation:
the first 35 to 40 acceleration will be 5 same as 40 to 45 ,
5+5=10
Car is moving in a straight line and steadily increases its speed. Then its acceleration in the first is 35 to 40 acceleration will be 5 same as 40 to 45 ,then 5+5=10.
What is speed ?"Speed is the distance traveled per unit of time. It is how fast an object is moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have a direction."
What is acceleration ?"Acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object. "
Know more about acceleration here
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A jet takes off from Florida and flies 100 miles north and then 400 miles west. Determine the total distance travelled by the jet.
Answer:
90m
Explanation:
Distance is not a vector but a scalar quantity. depicted by a quantity only.
hence:
Distance is equal to 30+40+20 = 90 m
4 A magnet can exert a force of attraction or a force of repulsion on another magnet.
Which of these forces is a push and which is a pull?
please explain too thanks!
Answer:
Push -repulsion
Pull - attraction
Explanation:
When two magnets are brought together, a push happens when a force of repulsion is experienced where the magnets move away from each other. This means their polarity is the same and this will cause the magnet to push away from each other.
When two magnets are brought together , a pull happens when a force of attraction is experienced where the magnets move close to each other. This means their polarity is different and thus causes the magnets to pull closer to each other.
How does surface area affect the amount of air resistance an object experiences?
Please what are the laws of Isaac Newton for Motion
Answer:
What are Newton's laws of motion? Newton's laws of motion relate an object's motion to the forces acting on it. In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration.
Can mechanical waves travel in a vacuum?
O yes
O no
No mechanical waves cannot travel in a vacuum
Mark, a 73 kg physics student, rides a rollercoaster. At the bottom of a steep dive he experienced a net force of 1600 N. What was his acceleration at that point? Show your work.
Answer:
21.9m/s²
Explanation:
Given parameters:
Mass of the physics student = 73kg
Net force = 1600N
Unknown:
The acceleration at this point = ?
Solution:
To solve this problem, we apply a knowledge of Newton's second law of motion which is mathematically expressed as;
F = m a
F is the friend
m is the mass
a is the acceleration
1600 = 73 x a
a = 21.9m/s²
Explain why wine glasses with long stems have broad base
Answer:
The best glasses have a wider bowl than rim to allow for proper swirling. The swirl releases volatile aroma compounds and creates a vortex in the center of the glass towards which these compounds are drawn
Explanation:\\\
A lift motor transfers 24 000J of energy in 1 minute travelling between floors. Calculate the power of the motor.
Answer:
400W
Solution :
power (w) = work done (J) ÷ time(s)
x= 24000J ÷ 60s = 400W
pleease answer this right ill give you 50 points
Answer:c a b I think I might be wrong but I’m pretty sure that’s it
Explanation:
An object is dropped from rest from a 70.6 m tower. Air resistance is negligible. After 0.32 seconds, what is magnitude and direction of its acceleration?
Answer:
1,378.9ms²
Explanation:
Given the following
Distance S = 70.6m
Time t = 0.32secs
Initial velocity = 0m/s
Required
Acceleration
Using the equation of motion
S = ut+1/2at²
Substitute
70.6 = 0+1/2a(0.32)²
70.6 = 0.0512a
a = 70.6/0.0512
a = 1,378.9
Hence the acceleration is 1,378.9ms²
You drive 10 meters backwards and then 20 more meters backwards in 30 seconds. What is your average velocity?
Answer:
Average velocity= 1 m/s
Explanation:
Step one:
given data
total distance covered = 10 meters backwards+ 20 more meters backwards
toatal distance= 10+20= 30 meters
time taken = 20 seconds
Required
The average velocity
Step two:
the expression for the average velocity is
Average velocity= total distance/total time taken
Average velocity= 30/30
Average velocity= 1 m/s