Answer:
t = 10.02 minutes
Explanation:
It is given that,
Speed of bus, v = 216 km/h
Distance to be traveled by the bus, d = 36 km
We need to find the time taken by the bus to cover the distance. Let the time is t.
Speed = distance/time
[tex]t=\dfrac{d}{v}\\\\t=\dfrac{36\ km}{216\ km/h}\\\\t=0.167\ h[/tex]
or
t = 10.02 minutes
So, 10.02 minutes is taken by the bus.
1. If you walk 3 kilometers
in 30 minutes, what is
your average speed in
kilometers per hour?
2. What distance will a
truck travel in 3 hours at
an average speed of 50
miles per hour?
NEED HELP ASAP
Answer:
1. 6 kilometers per hour
2. 150 miles
Explanation:
1. distance = 3km
time = 30mins = ½hr
speed = [3/(½)]
= 6 km/hr
2) time = 3hrs
speed = 50 mph
distace = speed × time
= 50 × 3
= 150 miles
True or False: The height from which cliff divers jump affects the velocity at which they will fall. Velocity is speed in a certain direction. Include your reasoning with your answer.
Answer:
the diver's speed is independent of the launch height.
Explanation:
For this exercise we must use Newton's second law
fr - W = m a
the friction force has the general form
fr = b v
Let's analyze this equation to find out what happens with the speed of the distant club.
When jumping, the initial speed is zero, so the friction force is zero and has an acceleration equal to the acceleration of gravity, as the speed increases the friction force increases decreasing the acceleration until it becomes zero, when it arrives at this value the velocity it has is called terminal velocity and this velocity remains fixed in relation to the trajectory.
fr = W
v = cte
The distance or time in which this equilibrium is reached is relatively fast, so the diver's speed is independent of the launch height.
true or false. Distance is always at the top of the triangle.
True
False
Answer:
TRUE
Explanation:
Answer:
Answer is True
Explanation:
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How does work affect energy between objects so it can cause a change in the form of energy?
Work transfers energy.
Work changes energy.
Work increases energy.
Work decreases energy.
Answer:
A. Work transfers energy.
Explanation:
Work can cause a change in the form of energy because work transfers energy.
Law of conservation of energy
The law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.
Work - energy theoremThe work energy theorem states that work done an object is equal to kinetic energy of the object. In other words, work transfers energy.
Thus, work can cause a change in the form of energy because work transfers energy.
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test your hypothesis: how will you use the computer model to test your hypothesis? what steps will you follow? what data will you record? conduct your experiment and record your results.
Answer:
what is a or b because in the question it dosent give me the answer choses that i need
Part 1: Newton’s Laws Observe the virtual skateboarder coming down the hill and over the ramp. Describe how each of Newton’s laws of motion can be observed in this action. You can choose the dry, wet, or muddy conditions, or some combination of these. Newton’s First Law of Motion The skateboard riding down a hill with mud once the skateboard reaches the bottom it slows down due to frictional force acting in the opposite direction. Newton’s Second Law of Motion Newton’s Third Law of Motion
Answer:
the FIRST LAW NEWTON's skater goes down at a constant speed.
eaching the ramp in skidding, it has an acceleration due to the decrease in friction force. This is NEWTON'S SECOND LAW
NEWTON'S THIRD LAW, in the Normal force which is a reaction to the support of the skating
Explanation:
This problem asks to describe Newton's laws in a skater.
When going down a hill the skater acquires a constant speed, since the friction grows with the speed until it reaches the value of the weight component, In this case we see that the sum of the external forces is zero and According to the FIRST LAW NEWTON's skater goes down at a constant speed.
When reaching the ramp in skidding, it has an acceleration due to the decrease in friction force. This is NEWTON'S SECOND LAW
in this same part we can appreciate NEWTON'S THIRD LAW, in the Normal force which is a reaction to the support of the skating on the ramp and the planes the force of the skateboard on the ramp.
The force of friction of that stops the skateboard is equal to the product of mass and acceleration of the skateboard.
The skateboard riding down a hill with mud once the skateboard reaches the bottom it slows down due to frictional force acting in the opposite direction.
The force of the skateboard is equal in magnitude to the frictional force but in opposite direction.
Newton's first law of motion states an object at rest or uniform motion in s straight line will continue in that form unless acted upon by an external force.
The skateboard riding down a hill with mud once the skateboard reaches the bottom it slows down due to frictional force acting in the opposite direction.Newton's second law of motion states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.
The force of friction of that stops the skateboard is equal to the product of mass and acceleration of the skateboard.Newton's third law of motion states that for every action there is equal and opposite reaction.
The force of the skateboard is equal in magnitude to the frictional force but in opposite direction.Learn more about Newton's law of motion here: https://brainly.com/question/10454047
David walks 3 km north, and then turns south and walks 4 km.
What’s the distance and displacement?
Explanation:
Distance is the length of the path.
d = 3 km + 4 km
d = 7 km
Displacement is the difference between the final position and initial position.
x = 3 km + (-4 km)
x = -1 km
x = 1 km south
The distance will be "7 km" and displacement be "1 km (south)".
Distance and Displacement:Distance would be a scalar number that describes "that however much ground an item had also adequately covered" while moving.
Displacement would be a vector variable which thus describes "just how out of placement of an item represents"; everything just reflects the amount change throughout the position of the object.
According to the question,
David walk,
3 km (north), then4 km (south)Now,
The distance (d) be:
= [tex]3+4[/tex]
= [tex]7[/tex] km
and,
The displacement (x) be:
= [tex]3+(-4)[/tex]
= [tex]3-4[/tex]
= [tex]-1[/tex] km i.e.., [tex]1[/tex] km (south)
Thus the response above are correct.
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A hiker moves across a mountain meadow that is 3 km wide in 40 minutes. What was her average velocity
Answer:
1.25m/s
Explanation:
Velocity is defined as the change of displacement with respect to time. Mathematically, velocity = displacement/time
Given displacement = 3km and time = 40minutes
Converting km to meters and minuetes to seconds;
Since 1 km = 1000m
3 km = (3*1000)m
3 km = 3000m
Also 1minute = 60seconds
40 minutes = 60*40 = 2400seconds
velocity = displacement/time
Velocity (in m/s) = 3000/2400
Velocity (in m/s) = 30/24
Velocity (in m/s) = 5/4
Velocity (in m/s) = 1.25m/s
Hence, the average velocity of he hiker is 1.25m/s
A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.90 of her regular weight.
Answer:
1 m/s² down
Explanation:
"Calculate the acceleration of the elevator, and find the direction of acceleration."
Sum of forces in the +y direction:
∑F = ma
N − mg = ma
0.9 mg − mg = ma
-0.1 mg = ma
a = -0.1 g
a = -1 m/s²
A camera employs a ............................... lens to form...................... images. a. converging .... real b. converging .... virtual c. diverging .... real d. diverging .... virtual
Answer:
b
Explanation:
A camera is a tool that helps to capture the live image and record the live video.
The camera is made up of a compound lens. The compound lens is made up of a mixture of mirrors.
The correct option is B
The mirror forms the image as follows:-
Real VirtualThere are two types of mirror:-
ConvergingDivergingThe camera has a converging lens. Hence they form the converging mirror.
Hence, the correct option is B that is converging and virtual
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A rocket in deep space has an empty mass of 220 kg and exhausts the hot gases of burned fuel at 2500 m/s. What mass of fuel is needed to reach a top speed of 4000 m/s
Answer:
Explanation:
Let fuel is released at the rate of dm / dt where m is mass of the fuel
thrust created on rocket
= d ( mv ) / dt
= v dm / dt
this is equal to force created on the rocket
= 220 dv / dt
so applying newton's law
v dm / dt = 220 dv / dt
v dm = 220 dv
dv / v = dm / 220
integrating on both sides
∫ dv / v = ∫ dm / 220
lnv = ( m₂ - m₁ ) / 220
ln4000 - ln 2500 = ( m₂ - m₁ ) / 220
( m₂ - m₁ ) = 220 x ( ln4000 - ln 2500 )
( m₂ - m₁ ) = 220 x ( 8.29 - 7.82 )
= 103.4 kg .
How long does it take an automobile traveling 66.7 km/h to become even with a car that is traveling in another lane at 52.7 km/h if the cars’ front bumpers are initially 119 m apart?
Answer:
30.6 seconds
Explanation:
Assuming the cars are moving in the same direction, the relative velocity is:
v = 66.7 km/h − 52.7 km/h
v = 14 km/h
Convert to m/s:
v = 14 km/h × (1000 m/km) × (1 hr / 3600 s)
v = 3.89 m/s
Distance = speed × time
119 m = (3.89 m/s) t
t = 30.6 s
A force of 400 N is applied to move a truck through a distance of 30 metres. What work is
done ?.
Answer:
[tex]\huge \boxed{\mathrm{12000 \ J}}[/tex]
Explanation:
Work done (J) = Force (N) × Distance (m)
W = 400 × 30
W = 12000
The work done is 12000 J.
Which part of the body should a student avoid touching during a lab? the arms the hands the face the legs
Answer:
Face
Explanation:
The face is the most important
Students should avoid touching the face.
Find distance traveled when a donkey took 20 sec to fall from a cliff at 9.8 m/s2
Distance traveled when a donkey took 20 sec to fall from a cliff at 9.8 m/s2 would be 1962 meters.
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
Keep in mind that these calculations only apply to uniform acceleration.
As given in the problem, we have to find the distance traveled when a donkey took 20 sec to fall from a cliff at 9.8 m/s2
initial velocity(u) = 0 m/s
acceleration(a) = 9.81 m/s²
By using the second equation of motion given by newton
S = ut + 1/2at²
S = ? ,u= 0 m/s , a= 9.81 m/s² and t =20 seconds
S= 0 + 0.5× 9.81×20²
S = 1962 meters
Thus, the distance traveled when a donkey took 20 sec to fall from a cliff at 9.8 m/s2 would be 1962 meters.
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during a crash a dummy with the mass of 60.0 kg hits a airbag that exerts a constant force in the dummy the acceleration of the dummy is 250 m/2 what force did the airbag exert on the dummy?
Explanation:
F = ma
F = (60.0 kg) (250 m/s²)
F = 15,000 N
During a crash, a dummy with a mass of 60 kg hits an airbag, then the airbag will exert 15,000 N force on the dummy.
What is acceleration?The rate of change in an object's velocity concerning time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.
There are several types of acceleration :
Uniform AccelerationNon-Uniform AccelerationAverage AccelerationAccording to the question, the given values are :
Mass, m = 60 kg
Acceleration, a = 250 m/s²
F = ma
F = (60.0 kg) × (250 m/s²)
F = 15,000 N
Hence, the force exerted by the airbag will be 15,000 N.
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The green book is 30 cm long, 15 cm wide and 3 cm high. What is the Volume?
Answer: 1,350cm³
Explanation:
Volume = LWH
= 30 × 15 × 3 = 1,350cm³
Calculate the kinetic energy of abody
of mass 5kg moving with
Velocity of
a
3mls-
Answer:
The kinetic energy is 22.5J .
Explanation:
Assuming that the formula to find kinetic energy is K.E = 1/2×m×v² where m represents the mass and v is the speed. Then, you have to substitute it :
[tex]k.e = \frac{1}{2} \times m \times {v}^{2} [/tex]
[tex]let \: m = 5,v = 3[/tex]
[tex]k.e = \frac{1}{2} \times 5 \times {3}^{2} [/tex]
[tex] k.e = \frac{1}{2} \times 5 \times 9[/tex]
[tex]k.e = \frac{1}{2} \times 45[/tex]
[tex]k.e = 22.5 \: joules[/tex]
(Correct me if I am wrong)
The part of the Electromagnetic (Light) Spectrum used to see through the dust
clouds in Space is?
A. Infrared light
B. Visible light
C. Radio waves
Answer:
A or C
Explanation:
Define neuron and nerve
cell
Answer: Hi!
A neuron is a basic working unit of the brain. Neurons are special cells designed to transfer information to other nerve, muscle, or gland cells. They are pretty cool - looking too! (A slightly irregular circular shape with branches reaching out from all sides.) A neuron is a nerve cell. Nerve cells are the way of communication in the nervous system.
Hope this helps!
Answer:
Explanation:
The basic unit of communication in the nervous system is the nerve cell (neuron). Each nerve cell consists of the cell body, which includes the nucleus, a major branching fiber (axon) and numerous smaller branching fibers (dendrites).
Is material medium required for sound waves propagation??? Give examples
Explanation:
Hey there!!!
As sound is a mechanical wave,it requires the medium to propagate. The most common waves are:
Air is themost common medium through which the sound travels easily.Water is also a factor that transfers the sound by vibrating water molecules. and solids are also medium to transfer or propagate sound waves.Hope it helps..
which type of electromagnetic waves has highest frequency
Answer:
Gamma rays have the highest energies.
Explanation:
HOPE IT WILL HELP ^_^
Answer:
Gamma rays have the highest frequencies.
Explanation:
what is the use of an inclined plane
Answer:
Hey there!
Inclined planes are used to lift heavy objects to higher places.
Hope this helps :)
Answer:
Inclined planes are used to lift heavy objects to higher places.
Explanation:
Give the measurement of the line in both centimeters and millimeters. (Assume the line starts at "0") I will give you brain list and explain
Answer:
In cm: 38.1
Explanation:
We find out that the line is 15 inches then we convert to centimeters:38.1cm.
Now we make 38.1cm in millimeters. I find it easier to convert to millimeters from cm. 38.1cm to mm is 381mm.
What should not be used to support a scaffold because they could collapse, sending the structure to the ground?
Answer:
Cinder blocks
Explanation:
From safety training guides, whenever there is inadequate support, poor
construction, or a movement in the components of the scaffold such as the coupler as well as the base upon which the scaffold structure is built, there will be a great danger of collapse.
In light of this safety rule, Cinder blocks such as sandcrete blocks, bricks e.t.c shouldn't be used to support scaffold because they have a high tendency of being crushed under load
Joey drives along the “110 South” freeway and notices a mile marker that reads 260 miles. He drives until he reaches the 150 mile marker. He realizes that he went too far, so gets on the 110 North to the 175 mile marker. What is Joey’s displacement from the 260 mile marker?
Answer:
85 miles
Explanation:
175 is 85 short of 260
Quinn is testing the motion of two projectiles x and y by shooting them from a sling shot. What can we say best describes the motion of the projectiles ? Assume air resistance is not a factor
Explanation:
A projectile motion may be defined as that form of a motion that is experienced by an object or a particle which is projected near the surface of the Earth and the particle moves along the curved path subjected to gravity force only.
Thus a projectile motion is always acted upon by a constant acceleration due to gravity in the down ward direction.
In the context, Quinn shoots two particle x and y from his sling shot and he observes that both his projectiles travels in a parabola curve in the air. Both the object x and y touches the ground a distance apart from him which is known as the range and it depends upon the velocity of the projectile. Both the projectile reaches a maximum height and then drop on the ground in a parabola shape.
B. The vertical velocity of projectile Y is changing, and the horizontal velocity of projectile X is constant.
What is the relationship between height and acceleration due to gravity
Answer:
Acceleration is due to gravity is the object due to the gravitational force.
Explanation:
Acceleration due to the gravity that the direction it is a vector quantity,and the gravity is perform to the represent by the surface of the earth.
Acceleration due to gravity is defined to the (g), in the free varies location on the standard value.Acceleration due to the gravity process is to perform the work force equals to the time acceleration, F=ma.Acceleration due to the gravity is to the similar sphere with radius poles, to the increasing that gravitational acceleration.Acceleration gravity is to the center of the earth and depend on the distance of that force.Acceleration gravity is the inversely square of the distance by that center of the earth.Acceleration gravity is that perform to the maximum at the poles and minimum at the equator,equator is the region is 20 km more then poles.Acceleration due to gravity is to contain the small height surface of the earth and then value to the gravity below depth of earth.Acceleration due to gravity variation to the due to gravity to the shape of the earth.A trapezoid is a 4-sided polygon which has 2
parallel sides.
Write an expression that represents the
perimeter of a trapezoid whose sides have
length a, b, c and d.
Use this expression to find the perimeter of
the trapezoid when a= 12. b
16. c = 16.
and d = 20.
What was the significant change that Glenn Seaborg made to Mendeleev’s periodic table?
Answer:
The Seaborg introduced the whole new row to the periodic table called actinides.
Explanation:
The american scientist Glenn Seaborg has many important contribution the chemistry. His work made a significant change in the mendeleev's periodic table. He introduced new row that is placed below the lanthanides row, called actinides.
He was co-discoverer or principle discoverer of plutonium and einsteinium. He was responsible for the discovery of more than 100 medical isotopes.
Thus, the Seaborg introduced the whole new row to the periodic table called actinides.