A car is moving at a rate of 72km/hr . How far does the car move when it stops after 4 seconds?
step by step asap pls
Answer:
The car will stop after 4 seconds after moving the distance of 0.08km.
Explanation:
The reading above it clearly states that a car is moving at a speed of 72Km/hr. And it asking for the distance the car move when it stops after 4 seconds.
Looking at speed formula , speed=distance÷time.
But in this problem we I finding distance, so in speed formula make distance the subject.
Therefore distance = speed × timeBefore going ahead you should have this in mind the unit for distance is Km and m . Our speed is in Km/hr but our time is in second. In this case change 4 seconds to hour which is 0.00111 hr .you change second to hour because hr will cancel hr when solving for distance giving distance unit Km
Distance = speed × time
Distance= 72km/hr × 0.00111 hr
hour cancel hour
Distance= 72km × 0.00111
Distance = 0.08km
Therefore the car will stop after 4 seconds after moving the distance of 0.08km.
Please mark brainliest.
conversion :
72 km/h = 72 × (1000/3600) = 20 m/s
so, in 4 seconds it travel
4 × 20 = 80 meters = 0.08 kmthe range of diameters and luminosities displayed by elliptical galaxies is ____.
The range of diameters and luminosities displayed by elliptical galaxies is 3000 to 700,000 light years and Mv-23 down to Mv- -16 mag respectively
What are elliptical galaxies?Elliptical galaxies are type of galaxies with a smooth ellipsoidal shape.
They are the most abundant galaxies in the universe.
Their diameter ranges from 3, 000 to 700, 000 light years.
Their luminosity ranges from Mv-23 down to Mv- -16 mag
Therefore, the range of diameters and luminosities displayed by elliptical galaxies is 3000 to 700,000 light years and Mv-23 down to Mv- -16 mag respectively.
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Against the park ranger's advice, a visitor at a national park throws a stone horizontally off the edge of a 83 m high cliff and it lands a distance of 93 m from the edge of the cliff, narrowly missing a visitor below.
What was the initial horizontal velocity of the rock, in m/s? You can round your answer to the hundredths place and use g ≈ 10 m/s2.
Answer:
20.37m/s
Explanation:
For this problem, we'll need a basic kinematic equation for both directions
Vertical direction:
[tex]y(t)=\frac{1}{2}a_{y}t^{2}+v_{o_y}t+y_{o}[/tex]
Knowing that the acceleration in the y-direction is due to gravity, and is constant near the surface of the Earth, where the rock is being thrown, we get [tex]a_{y}=g=-10m/s^{2}[/tex]. We're also given that the initial vertical height is 83m, so [tex]y_o=83m[/tex]. Additionally, we're given that the stone is thrown horizontally, and thus initially, it has no vertical velocity. Only velocity in the x-direction. Thus, [tex]v_{o_y}=0m/s[/tex]. Substituting known values into our equation:
[tex]y(t)=\frac{1}{2}(-10)t^{2}+(0)t+(83)[/tex]
[tex]y(t)=-5t^{2}+83[/tex]
This equation is true for all times until the acceleration changes (isn't constant... i.e. when it hits the ground).
What now?
We want to find the specific time when it does hit the ground. Why? Because this is the point in time where we know some extra information about what is happening in the x direction, and that will help us deal with the x-direction equation.
When the stone does hit the ground, the output of this function (measuring the height of the stone) is zero, which leaves only one unknown value, t... the time associated with that y: the time that it takes to hit the ground:
[tex]0=-5(t_{ground})^{2}+83\\-83=-5(t_{ground})^{2}\\\frac{-83}{-5}=(t_{ground})^{2}\\16.6=(t_{ground})^{2}\\\sqrt{16.6}=\sqrt{(t_{ground})^2}\\4.074309757seconds=t_{ground}[/tex]
Again, this is the time that the stone hits the ground. Knowing how special this time is, one might give it a special subscript to keep track of it.
[tex]t_{ground}=4.074309757seconds[/tex]
Horizontal direction
Reusing the basic kinematic equation for the horizontal direction:
[tex]x(t)=\frac{1}{2}a_{x}t^{2}+v_{o_x}t+x_{o}[/tex]
Note that in the horizontal direction, there is no acceleration (after the rock is released), so [tex]a_{x}=0[/tex]. Also, if we define the base of the cliff as our origin, then at the top of the cliff where the rock is released, the initial x-position is still zero, aka, [tex]x_{o}=0[/tex]
[tex]x(t)=\frac{1}{2}(0)t^{2}+v_{o_x}t+(0)\\x(t)=v_{o_x}t[/tex]
While we don't know the initial horizontal velocity, we do know an output of the function for one specific input... we know that when the stone hits the ground, that the stone's horizontal distance is 93m from the cliff. So, if we input [tex]t_{ground}[/tex] into this function, it will give an output of 93. The only remaining unknown is the initial velocity in the x direction. One equation, one unknown, we can solve this:
[tex]x(t_{ground})=v_{o_x}t_{ground}\\83=v_{o_x}(4.074309757)\\\frac{83}{4.074309757} =v_{o_x}\\20.37154879m/s =v_{o_x}\\[/tex]
If there were a component of initial velocity in the y direction, we would need to use the Pythagorean theorem to combine them. However, as the initial y component of velocity is zero, the initial velocity is simply the initial x velocity.
Paying attention to directions, round to the answer to the nearest hundredth:
[tex]20.37m/s =v_{o}\\[/tex]
Which best describes solubility? the speed at which a substance dissolves the ability of one substance to dissolve in another the amount of surface area per a given mass the temperature at which subtances become a mixture
Answer:
The ability of a substance to dissolve into another, called the solvent.
Explanation:
That is why water is called "the universal solvent."
Because it can dissolve almost anything.
The speed and temperature have nothing to do with solubility.
Answer:
the ability of one substance to dissolve in another
Explanation:
a sample contains 100 g of radioactive isotope. How much radioactive isotope will remain in the sample after 1 half-life?
Answer:
[tex]\huge\boxed{50g}[/tex]
Definition:
Half-life- The time taken for half of the radioactive isotopes to decay.
Explanation:
How does radioactive decay work? Radioactive decay is a process by which unstable nuclei become more stable through the emission of alpha or beta particles or gamma rays.
Since a half-life is the time taken for half of the isotopes to decay, we can simply divide the initial mass of 100 grams by 2; this gives us 50 grams.
1) Divide 100g by 2.
[tex]\frac{100g}{2}=50g[/tex]
ubes have sides of equal lengths. What is the fastest way to measure the volume of a cube-shaped table?
measure the length, width, and height of the table, then multiply those numbers
measure one side with a ruler, and multiply that number by itself three times
measure one side with a ruler, and multiply that number by itself and then by
measure the length, width, and height of the table, then multiply those numbers by
The quickest technique to calculate the volume of a cube-shaped table is to use a ruler to measure one side, then multiply that figure by three. Option B is correct.
How do you calculate the volume of a cube?Assume the side length of the cube under consideration is L units. The volume of the cube is then equal to L³ cubic units.
The volume of a cube is;
V = L³
Ubes have equal-length sides. The quickest technique to calculate the volume of a cube-shaped table is to use a ruler to measure one side, then multiply that figure by three.
Hence option B is correct.
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What is the frequency in hertz of the UK
mains electricity supply?
Answer:
HERTZ=HZ
Explanation:
Identify each statement that describes a benefit of the scientific method. (Select all choices that apply)
Group of answer choices
a) It provides an answer to questions immediately.
b) It gives scientists a standardized way to approach a problem.
C) It gives scientists a common vocabulary for sharing information.
D) It reduces bias and judgment from personal experiences.
The statements that describe a benefit of the scientific method are as follows:
It gives scientists a standardized way to approach a problem. It reduces bias and judgment from personal experiences. It gives scientists a common vocabulary for sharing information.Thus, the correct options are B, C, and D.
What is the Scientific method?The scientific method may be defined as a strategy of research in which a problem is recognized, relevant data is collected, a conjecture is composed of this data, and the assumption is empirically tested to determine the outcome of particular research.
The scientific method never explains or provides an answer to any question immediately because it consists of a scripted format with certain parameters.
The scientific method uses the identical vocabulary for sharing information with one another in particular terminology.
Therefore, it is well described above.
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which will have longer shadow: ben whose height is 5 feet tall and 2 inches or his brother mike who is 6 feet and 2 inches when they both stand under the sun around 10am? i need help asap and anyone get my answer now i will give branliest
Answer: I believe his brother, Mike, who is 6'2, will have the longer shadow.
a cyclist applies a constant forward force of 20 N to maintain a velocity 2.5 m/s. how much power does the cyclist deliver?
The power exerted by the cyclist is determined as 50 W.
Average power exerted by the cyclist
The power exerted by the cyclist is calculated as follows;
P = FV
where;
F is the applied forceV is velocityP = 20 x 2.5
P = 50 W
Thus, the power exerted by the cyclist is determined as 50 W.
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Determine the value of n so that the vectors A and B are perpendicular: Ā = î + 5j + nk and B = 2î - j + k
If [tex]\vec A[/tex] and [tex]\vec B[/tex] are perpendicular, then their dot product is zero. This means
[tex]\vec A \cdot \vec B = (\vec\imath + 5\,\vec\jmath + n\,\vec k) \cdot (2\,\vec\imath - \vec\jmath + \vec k) = 2 - 5 + n = 0[/tex]
Solving for n is trivial; it follows that n = 3.
A metal wire, initially 1.000m long, extends by 4mm when a loaded of 2N is added to it. What will the length of the wire be if a further 3N is added, assuming it does not extend beyond its limit of proportionally?
Explanation:
you should first find the proportionality constant or the spring constant(as we see it as a spring).the find the value of x so that the force is 3N
Describe a situation in which friction changes the direction of a moving object.
Consider a person trying to push a large crate across a floor, as in the diagram. As they apply a force to push the crate along the floor in one direction, a frictional force is generated in the opposite direction.
[tex]study \: well.....[/tex]
what type of bulb is unaffected
Nothing happens to the brightness of the light bulbs in the parallel circuit if the power supply is capable of supplying the additional current.
what is the index of the refraction?
Answer:
The value of index of refraction(n₂) is 1.26
Explanation:
look at the attachment above
how does radiation differ from conduction and convection for the transference of heat
?
Answer:
look below! :)
Explanation:
Radiation transfers heat through electromagnetic waves
conduction transfers heat through direct contact of things
convection transfers heat through movement of air or water
whats the process to getting the answer
The third charge is in equilibrium, 2a/3
What is electric field?An electric property associated with each point in space when charge is present in any form.
The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.
According to the question,
force on it due to +4e= force due to +e
[tex]\frac{ k(4e)q}{x^{2} } = \frac{ k(e)q}{(a-x)^2}[/tex]
4(a-x)² = x²
2(a-x)=x
2a-2x =x
x= [tex]\frac{2a}{3}[/tex]
Therefore,
The position along the line XY is [tex]\frac{2a}{3}[/tex]
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A proton moves in the negative x-direction through a uniform magnetic field in the negative y-direction what is the direction of the magnetic force acting on the proton?
out of the page
into the page
in the positive y-direction
in the negative y-direction
What is the unit of velocity ratio and why
Answer:
the unit of velocity is meter per second
Answer:
No unit
Explanation:
If this question is asking what the unit of velocity to velocity is i.e. v/v then there is no unit because the units are canceled.
A golfer wishes to chip a shot into the hole 50m away on flat level ground. if the ball flies to a maximum height of 25m, what speed must it have initially to reach the hole?
it's grade 11 physics, so the more equations the better, thanks :d
The speed the golf must have initially to reach the hole is 31.32`1 m/s.
What is projectile?When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion.
A golfer wishes to chip a shot into the hole 50m away on flat level ground. if the ball flies to a maximum height of 25m.
The angle with which the ball flies,
tan θ = 25 m/ (50m/2)
tan θ =1
θ =45°
If u is the initial speed, the maximum height of the ball is
H = u² sin²θ / 2g
Put the values, we get
25 = u² sin²45 / (2x9.81)
u = 31.321 m/s
Thus, the initial speed is 31.321 m/s
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A kettle consumes 198 kJ to boil water. If 168 kJ was used to boil the
water, what is the efficiency of the kettle?
The efficiency of the kettle is 117.9%
What is efficiency?Efficiency is used to measuring how much work or energy we can conserve in a process. In other words, it is like comparing the output of the energy to the input of the energy in any given system.
It is also define as the ratio of Energy Input to the Energy Output. To express it in percent multiply it by 100.
Here, Efficiency = Energy output / Energy input
[tex]η =\frac{W_{out} }{W_{in} } * 100[/tex]
[tex]η = \frac{198kJ}{168kJ} * 100[/tex]
= 117.9%
So , the efficiency is 117.9%
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Please help me! Uniform acceleration problem sheet:
In 1997, the thrust SSC, a turbofan powerd vehicle, acheive the land speed world record of 780.34 mph (1,223.65km/h) and became the first car to break the sound barrier. If it tool 1 minute for the thrust SSC to reach its top speed, what was the average acceleration during the time?
From the calculation, the value of the acceleration is 5.8 m/s^2.
What is uniform acceleration?The term uniform acceleration refers to a situation in which the velocity increases by equal amounts in equal time intervals.
Given the fact that the car started from rest and reached a velocity of 780.34 mph or 348.84 m/s in 1 minute of 60 seconds;
v = u + at
a = v/t
a = 348.84 m/s/ 60 seconds
a = 5.8 m/s^2
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The table describes the properties of four compounds.
Which compounds are most likely ionic?
The actual mass of a sheet of copy paper is 4.5 g. What must be the actual mass of a 1 cm² plece of copy paper?
Show your calculations.
The actual mass of a 1 cm² piece of copy paper is determined as 0.0074 g.
Area of the sheet of paper in square centimetersArea = Length x Width
Area = (11 x 2.54 cm) x (8.5 x 2.54 cm)
Area = 603.22 cm²
Actual mass of the sheet of paperMass = area density/area
Mass = (4.5 gcm²)/(603.22 cm²)
Mass = 0.0074 g
The complete question is below:
A sheet of 8.5 inch by 11inch paper has a mass of 4.50 grams one square centimeter , 1cm2 of that sheet of paper will have a mass closets to ____grams ( (hint use 1inch = 2.54 centimeters and area = length times)
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What is the difference between a conductor and an insulator?
Select one:
O a. An insulator transfers thermal energy while a conductor does not. Insulators do not
allow thermal energy to move through them.
Ob.
A conductor transfers thermal energy while an insulator does not.
O c.
Both conductors and insulators transfer thermal energy, but not electrical energy.
One of them does not transfer energy.
O d. Both conductors and insulators transfer electrical energy, but not thermal energy.
Answer:
b
Explanation:
An insulator does not transfer thermal or electrical energy but a conductor does
which of the following travels the fastest
All move at the same speed.
Explanation:
Electronic magnetic spectrum includes radio waves, micro waves, infra red, visible light, ultra violet, x-rays, gamma rays. These all electromagnetic waves travel at the same speed of light of about 300,000,000 m/s through vacuum. Though they have different wavelength, their speed is same.
9. Ripening is a _______________ and spoiling is a ______________.
A. Physical reaction, chemical reaction.
B. Physical reaction, physical reaction.
C. Chemical reaction, physical reaction.
D. Chemical reaction, chemical reaction.
Answer:
C
Explanation:
Chemical reaction,physical
which is a barrier to the correct interpretation of what you hear?
The a barrier to the correct interpretation of what you hear can occur due to different frame of reference.
What is frame of reference?A frame of reference is a particular set of beliefs or ideas on which you base your judgment of things.
A barrier in the correct interpretation of information can occur when two observers are in different frames of reference.
Thus, the a barrier to the correct interpretation of what you hear can occur due to different frame of reference.
The complete question is below:
Which is a barrier to the correct interpretation of what you hear?
-Different frame of reference
-Dissimilar vocabulary
-Differing accent
-Jargon usage
-Poor explanation
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A rare butterfly (0.01 kg) is slowly flapping its wings and moving across a road. An unsuspecting driver in a large car (1000 kg) going very fast makes a sharp turn and runs directly into the butterfly. The butterfly smashes against the windshield (of course) but the car keeps moving down the road. Which object has the greater force: The butterfly or the car?
Both the butterfly and the large car will have equal forces but in opposite direction.
Newton's third law of motion
Newton's third law of motion states that action and reaction are equal and opposite. That is, the force exerted on an object is equal to the reaction experienced by the object.
Fa = - Fb
where;
Fa is the force exerted by the large carFb is the force of the butterflyThus, both the butterfly and the large car will have equal forces but in opposite direction.
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PLEASE HELPP
just do the diagram
Answer:the line away from the spacecraft should be straight down (perpendicular to it). Label this M. This is the force of the moon on the spacecraft. A minuscule line upward from the moon towards the spacecraft shows the force of the spacecraft on the moon. Should be directly below the spacecraft and pointed straight up at it.
Explanation:
