After 0.85s, the ball would be at the same height.
CalculationA ball is thrown upward from the ground with an initial speed of 23.4 m/s; at the same instant, another ball is dropped from a building 20 m high....
We know that from the equation of motion,
h = u t + 1/2 at^2
So h = height, u is initial velocity and t is time, a is acceleration
Now for the ball thrown upwards
h = 23.4 t – 1/2 gt^2
23.4 t – h = 1/2 gt^2
Now for the ball dropped downwards
20– h = 1/2 gt^2
Comparing both the equations we get
23.4t – h = 20 – h
23.4 t = 20
So t = 20/23.4
Or t = 0.85 secs
The balls will be at same height when t = 0.85 s
Motion under gravityGravity causes a body to descend faster, and as it does, the air resistance that slows it down rises.
This keeps happening until the weight of the object and the force of air resistance are equal. The terminal velocity is the pace at which the item now falls instead of accelerating any longer.
What do you mean by motion in a gravitational field?When any object moves, it is said to be in motion under gravity. This is because gravity has an impact on the object’s vertical motion.
Gravity is the force that pulls things downward. In actuality, gravity pulls objects toward the Earth’s center.
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A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic force on the loop is.
A circular loop of wire carries a constant current. If the loop is placed in a region of the uniform magnetic field, the net magnetic force on the loop is zero.
In an electric loop, the current-carrying wire creates a magnetic field that is perpendicular to the direction of the current.
Now let's suppose there are two diametrically opposite objects as shown in the figure below.
As the current is moving in the opposite direction, therefore, the effect of forces will cancel out each other due to
dF =i( dl × B ).
It is because the magnetic field is perpendicular to the plane of the loop.
Thus, all forces will cancel out their effect and the net force on the loop will be zero.
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A high-mass star near the end of its life undergoes successive cycles of energy generation within its core in which gravitational collapse increases the temperature to the point where a new nuclear fusion cycle generates sufficient energy to stop the collapse. This process does not work beyond the silicon-fusion cycle that produces iron. Why is this?"".
The process of gravitational collapse does not work in the silicon-fusion cycle that produces iron. It is because the iron nuclei do not have sufficient energy and therefore will not produce the additional gas pressure to halt the collapse.
The gravitational collapse process is a process during which astronomical objects such as massive stars contract due to their own gravitational pressure.
The gravitational pull draws the matter to the core of the object thus increasing energy generation which in turn increases the temperature of the central part of the object.
Due to this fundamental process, the old structure collapse, and new structure are formed in the universe.
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A particle is moving at 0.86c. by what magnitude percentage is the newtonian expression for momentum in error?
The calculated magnitude percentage is 125 %.
The Heisenberg Principle has a significant impact on how science is done and how experiments are created. This will transfer some of the momentum from the second particle to the electron being measured, changing it. A particle with a shorter wavelength and higher energy would be needed to measure the electron's position with more accuracy, but this particle would also change the momentum of the collision even more.
Pi is P Pf plus 50/100. P = 3/2 P
E = P2/2m describes how kinetic energy and momentum are connected.
E2 = (E2 - E 1)/E1 [E1 = E, E2 =?
100 = Pi 2/ 2m/ (Pf 2/2m - Pi 2/2m)
×100 = {(3/2) ² - 1} ×100 = (2.25-1) ×100 = 125%
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A car traveled at an average speed of 65 mph for 10 hours.
How far did it travel?
10 miles
10 miles
65 miles
65 miles
650 miles
650 miles
6,500 miles
Answer:
650 miles
Explanation:
if car 65mph constant = 1hour = 65 mile x 10 = 650.
When a value is assigned to a property, the property's __________ is executed and the value being assigned is contained in the value parameter.
The property's set accessor is executed, and the value being assigned is contained in the value parameter.
In properties, a get accessor is used to return a property value and a set accessor is used to assign a new value. The value keyword in set accessor is used to define a value that is going to be assigned by the set accessor. In c#, a property is called an auto-implemented property when it contains accessors (get, set) without having any logic implementation. Also, in c#, properties will enable class variables to expose in a public way using get and set accessors by hiding implementation details. These properties are categorized as read-write, read-only, or write-only. It is common for the get and set accessor to be used together in programming.
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You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building. Before the state legislature votes on funding for the project, they would like you to prepare a report on the benefits of upgrading the elevators. One of the numbers that they have requested is the time it will take the elevator to go from the ground floor to the 102nd floor observatory. They are unlikely to approve the project unless the new elevators make the trip much faster than the old elevators.
If state law mandates that elevators cannot accelerate more than 2.70 m/s2 or travel faster than 14.3 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor?
Answer:
31.38 s (2 d.p.)
Explanation:
Constant Acceleration Equations (SUVAT)
[tex]\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}[/tex]
When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.
-----------------------------------------------------------------------------
To find the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor, we to accelerate to the maximum allowed velocity as quickly as possible, maintain the maximum velocity for as long as possible, and then decelerate for the shortest period of time in order for the elevator to come to a stop after 373 m.
Therefore, the travel time from the start of the elevator trip to the end will have three phases:
AccelerationConstant velocityDecelerationPhase 1 - AccelerationGiven information:
[tex]u = 0 \sf \; m/s[/tex][tex]v= 14.3 \sf \; m/s[/tex][tex]a= 2.70 \sf \; m/s^2[/tex]The time it takes to accelerate from rest to the maximum allowed velocity, where the elevator accelerates at the maximum allowed acceleration:
[tex]\begin{aligned}v & = u+at\\\implies 14.3 & = 0+2.7t\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]
The distance covered in this time is:
[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 14.3^2 & = 0^2 + 2(2.7)s\\204.49 & =5.4s\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]
Phase 3 - DecelerationGiven information:
[tex]u = 14.3 \sf \; m/s[/tex][tex]v= 0 \sf \; m/s[/tex][tex]a= -2.70 \sf \; m/s^2[/tex]When the elevator is decelerating from the maximum velocity to being at rest, it will take the same amount of time and cover the same distance as its acceleration phase:
[tex]\begin{aligned}v & = u+at\\\implies 0& = 14.3+(-2.7)t\\2.7t&=14.3\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]
[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 0^2 & = 14.3^2 + 2(-2.7)s\\0 & = 204.49 -5.4s\\5.4s&=204.49\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]
Phase 2 - constant velocityThe total distance the elevator travels is 373 m.
Therefore, the distance it travels during phase 2 when it is traveling at a constant (maximum) velocity is the total distance less the distance traveled in phases 1 and 3:
[tex]\begin{aligned}\implies s & =373-2(37.86851852)\\s& = 297.262963\;\sf m\end{aligned}[/tex]
Given information:
[tex]u = 14.3 \sf \; m/s[/tex][tex]v= 14.3 \sf \; m/s[/tex][tex]s = 297.262963\;\sf m[/tex]Therefore, the time is takes to travel this distance when it is traveling at a constant (maximum) velocity is:
[tex]\begin{aligned}s&=\left(\dfrac{u+v}{2}\right)t\\\implies 297.262963 & = \left(\dfrac{14.3+14.3}{2}\right)t\\297.262963 & = 14.3t\\t & = \dfrac{297.262963}{14.3}\\t & = 20.78761979 \; \sf s\\\end{aligned}[/tex]
Total minimum timeTherefore, the minimum time is the sum of the time calculated for the three phases:
[tex]\begin{aligned}\sf Minimum \: time& = \sf Phase \: 1 + Phase \: 2 + Phase \: 3\\& = 5.296296...+5.296296...+20.78761...\\& = 31.38021...\\& = 31.38\; \sf s\end{aligned}[/tex]
A 50-kg stunt diver is falling at a speed of 20 m/s. When she is stopped by sinking into a cushion, the cushion exerts an average force of 2500 n on her. Approximately how much time did it take her to stop moving once she hit the cushion?.
The approximately time that takes to stop the stunt driver once she hit the cushion is: 0.4 s
To solve this exercise, the formulas and procedures to be applied are:
F = m * at = (vf – vi) / aWhere:
m = massF = Forcea = accelerationt= timevf= final velocityvi = initial velocityInformation about the problem:
m = 50 kgvi = 20 m/s F= -2500 NVf = 0 m/s1 N = kg * m/s²a= ?t =?Applying the force formula and isolating the acceleration, we get:
F = m * a
a = F/m
a = -2500 N /50kg
a = -2500 kg * m/s² / 50 kg
a = -50 m/s²
Applying the time formula we get:
t = (vf – vi) / a
t = (0 m/s – 20 m/s) / 50 m/s²
t = (– 20 m/s) / -50 m/s²
t = 0.4 s
What is force?It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.
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A mercury-used clinical thermometer has a kink near its bulb
Answer:
A mercury-used clinical thermometer has a kink near its bulb because
Explanation:
it helps to slow mercury going back to the bulb and get the accurate temperature.
In what kind of pot will a given volume of water boilat a higher temperature: a tall and narrow one or a short andwide one? explain.
The water in both pots will boil at the same temperature as long as the pressure is consistent. Both pots' water will reach boiling point at the same temperature.
what is boiling point?The point at which the pressure that a liquid is subjected to from its environment equals the pressure that the liquid's vapor is subjected to; in this situation, the addition of heat causes the liquid to turn into its vapor without rising the temperature.
A liquid partially vaporizes through into space above it with any temperature up until the vapor pressure of the fluid at that temperature, which is a characteristic value. The vapor pressure rises as the temperature rises, and when the liquid reaches the boiling point, vapor bubbles develop inside the liquid and rise to the surface. A liquid's boiling point changes depending on the pressure being applied; the constant boiling refers to the temperature where the vapor pressure of the liquid is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F). Lower boiling point temperatures are seen at greater elevations.To know more about boiling point visit:
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Jeremy hypothesized that adults with blue eyes are shorter than adults with brown eyes. He collected data by visiting all of the teachers in his school and found that his hypothesis was false. Should Jeremy consider his hypothesis useful?
A.
Yes; now he knows that the exact opposite of his hypothesis must be true.
B.
Yes; a false hypothesis gives a scientist new information to use.
C.
No; a false hypothesis makes a scientist look silly.
D.
No; false hypotheses are a waste of time.
Answer: B. Yes; a false hypothesis gives a scientist new information to use.
Explanation:
Let us take a look and break down all the question's answer options.
✗ A.
Yes; now he knows that the exact opposite of his hypothesis must be true.
➜ This is not the case. He must look at this data and decide what is true.
✓B.
Yes; a false hypothesis gives a scientist new information to use.
➜ Yes! We learn from our research and looking back at our hypothesis.
✗ C.
No; a false hypothesis makes a scientist look silly.
➜ This isn't true. You cannot expect to be right all the time, and scientists make incorrect hypotheses frequently.
✗ D.
No; false hypotheses are a waste of time.
➜ Tying back into B and C, this isn't true. We learn from comparing our hypotheses with our data.
Calculate the acceleration of a galloping horse going from 2 m/s to 12 m/s in 2 seconds.
A) 5 m/s/s
B) -5 m/s/s
C) 0. 2 m/s/s
The horse has an acceleration in 2 seconds of: A) 5 m/s/s
The formula and procedure we will use to solve this exercise is:
a = (vf - vi) /t
Where:
a = accelerationvf = final velocityvi = initial velocityt = timeInformation about the problem:
vi= 2 m/svf = 12 m/st = 2 sa=?Applying the acceleration formula we have:
a = (vf - vi) /t
a = (12 m/s - 2 m/s) /2 s
a = (10 m/s) /2 s
a = 5 m/s²
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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When your car is moving at 3.85 m/s and car has a mass of 881 kg, how much translational kinetic energy does it have?
The translational kinetic energy does it have -6,528.21 joule
we have given the values of
v = 3.85m/s
m = 881 kg
kinetic energy = m[tex]v^2[/tex]/2
= 881 [tex]\times[/tex] [tex](3.85)^2[/tex]/ 2
= 881 [tex]\times[/tex]14.82/ 2
= 13,056.42
= 6,528.21 joule
Hence kinetic energy of car is 6,528.21 joule
Units energy is measured in joulesKinetic Energy is the energy of an object's motion due to the object's motion example A rolling ball, a moving rollercoaster, and a toy car.Kinetic energy depends on Mass and speedKinetic Energy is the energy of motion when an object falls It's potential energy is converted into kinetic energy Therefore, potential energy lost = kinetic energy gained mgh = 1/2 m [tex]v^2[/tex]To know more about Kinetic Energy visit : https://brainly.com/question/12669551
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who was newton? who was albert einstein?
Answer:
Newton discovered gravity and Albert Einstein is a theoretical physics
Explanation
hope it helps have a nice day! :)
BRAINIEST is appreciated
distinguish between a longitudinal and transverse waves
Answer:
In a longitudinal wave, the medium or the channel moves in the same direction with respect to the wave. Here, the movement of the particles is from left to right and forces other particles to vibrate. In a transverse wave the medium or the channel moves perpendicular to the direction of the wave.
Explanation:
In a linux machine, what command can you use to safely terminate a process with a pid of 342?
Sending the SIGTSTP signal will halt or suspend a running process. kill -TSTP 342; is the command.
What is linux machine?
The local system's distinctive machine ID, which is specified at installation or boot, is stored in the /etc/machine-id file. The machine ID is a single, 32-character, lowercase, hexadecimal ID that ends with a newline. This is equivalent to a 16-byte/128-bit value when decoded from hexadecimal.
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The speed of a wave is 65 m/sec. If the wavelength of the wave is 2 meters, what is the frequency of the wave
(f=65/2)
32.5 Hz
130 Hz
215 Hz
14.2 Hz
The shape of municipal water tank has the same shape as a drop of water resting on a nonabsorbent surface, such as a wax paper. explain why engineers design the tank in this manner.
The shape of municipal water tank has the same shape as a drop of water resting on a nonabsorbent surface, such as a wax paper.
The engineers design the tank in this manner because:
Economic structureA cylindrical water tank is more economical to build than others because it requires less construction material. The main reason is that it has the smallest possible girth-to-area ratio than a box-shaped tank. Here you can save costs.
Constant heat levelSince circular structures minimize the surface area that heat radiates from, the water temperature remains more stable than other structures such as a square or rectangle. It therefore remains less affected by changing outside temperatures and keeps the water cooler in summer and warmer in winter.
Strong and durableAccording to Monolithic, the round structure is the strongest geometric structure than the square. Thus, a cylindrical water tank can withstand all external forces, such as strong wind or heavy rain, better than a square or rectangular tank. Thanks to this, the tank lasts longer.
Easy cleaningCylindrical tanks are comparatively easier to clean than tanks with corners. Therefore, the water remains more hygienic in round water tanks than others.
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Using the kinetic molecular theory, describe what happens to molecules during the phase change from ice to liquid water.
HELP ME I'D GIVE BRAINLIEST
Answer:
When the ice melts into water, there is kinetic energy being increased to its particles, later on the particles 'break the bonds' that hold the ice together, which leads to ice turning into water.
This is my best I can answer to this question
Calculate the amount of water (in grams) that must be added to (a) 5.80 g of urea [(nh2)2co] in the preparation of a 6.40 percent by mass solution:
The amount of water (in grams) that must be added to 5.80 g of urea [(nh2)2co] in the preparation of a 6.40 percent by mass solution is 84.83g.
How to calculate the amount of water added?When the masses of a solute and a solution are provided, the concentration of the solution is expressed using the mass percent:
Mass% = Mass of Solvent 100% of Solution's Mass
The percent by mass solution = the grams of solute in 100 g. of solution.
(A) So, 6.40 g of urea are contained in 100 g of solution.
So, 93.6 water was added to make a 6.40 g solution.
Thus for, 5.80 g of urea,
(5.8*93.6)/6.4 = 84.83g
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Calculate the time it takes for a bat to detect a predator approaching at a distance of 1000m away. assume sounds travel 330 m/s in air
A bat will take 3.03 s to detect a predator approaching at a distance of 1000m away
The formula and procedure we will use to solve this exercise is:
t = x/v
Where:
x = distancet = timev = velocityInformation about the problem:
v = 330 m/sx = 1000 mt = ?Applying the time formula from the uniformly rectilinear motion (URM), we have:
t = x/v
t = 1000 m / 330 m/s
t = 3.03 s
What is velocity?It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
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Two identical containers at the same presure contain the same gas. if container a contains twice as much gas as container b, which container has the higher temperatrue?
By ideal gas approximation, container A has a higher temperature than container B.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
PA = PA
nA = 2nB
When the initial and final pressure is the same, we can use the ratio of moles and temperature as
nA / TA = nB / TB
substitute nA
2nB / TA = nB / TB
TA = 2 TB
Hence, container A has a higher temperature than container B.
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Pls answer this
It’s urgent
Answer:
mohans face simple
if u see the drivers face in the mirror
the drive will see ur face
You stand on a scale that rests on the floor of an elevator that is accelerating upward. what is the relationship between the force due to gravity (mg) and the normal force (n) exerted by the scale?
The relationship between the force due to gravity (mg) and the normal force (n) exerted by the scale
due to upward accelaration.
N = mg + ma , here N MEANS normal force
here now, N > mg realtionship between normal force and force
whilst an item sits on a surface, the floor exerts a force on that object. This force is called the normal pressure, ordinary method "perpendicular" no longer "regular". The everyday force is always perpendicular to the floor.The everyday force is equal to the load of the item (for this class) = mg .The regular force is the "same and opposite response pressure" to the items weight. It continues the object from falling thru the floorForce is measured in Newtons. NTo know more about normal force visit : https://brainly.com/question/18799790
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During stage 3 of star formation, the dense, opaque region at the center of the cloud is called a:_____.
During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.
What is Herbig-Haro object?Bright nebulosity patches known as Herbig-Haro (HH) objects are linked to young stars. They are created when fast-moving, nearby clouds of gas and dust meet with narrow jets of partly ionized gas released by stars. Typical Herbig-Haro objects can contain up to 20 Earth masses of material and have temperatures of about 10,000 Kelvin.
They also have densities of a few thousand to a few hundred thousand particles per cubic centimeter. Over 600 have been discovered so far, all in star-forming regions and typically connected to Bok globules. They were once extremely rare. A brilliant cloud that stretches away from a star in the process of formation is known as a Herbig-Haro object (or HH object). The gravitational agglomeration of clouds produces protos tars.
Hence, During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.
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Situation: A man is driving a car and moving at a constant velocity of 5m/s², while approaching at the traffic light from afar.
Write the appropriate action or state of motion based on the following situations below:
1.) A red light is on.
2.) How will he change his direction from the intersection where the traffic light is located?..
The change his direction from the intersection where the traffic light is located is 5m in south direction.
The displacement covered by a body per unit time is defined as its velocity. Velocity is a vector quantity that indicates the magnitude of the body's speed as well as the direction in which the body is moving. As a result, the velocity of an object can provide us with the direction of motion of the body.
Acceleration can now be defined as the rate at which an object's velocity changes per unit time. The particle's velocity rises with time in the direction of acceleration. Again, if acceleration is perpendicular to velocity direction, the body moves in a circular route. As a result, acceleration can also indicate the direction of motion of a body.
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What wavelength of light (nm) is required to eject an electron with a speed of 2.0 x 10^6 m/s from a metal with a threshold energy of 3.4 x 10^-18 j?
The wavelength of light (nm) is required to eject an electron with a speed of [tex]2.0 \times 10^{6}[/tex] m/s from a metal with threshold energy of [tex]3.4 \times 10^{-18 }[/tex]jis 0.39nm.
A periodic wave's spatial period, or the distance across which the wave's form repeats, is defined by its wavelength. It is a characteristic of both traveling and standing waves as well as other spatial wave patterns, and it is the distance between two adjacent corresponding points of the same phase on the wave.
Speed of proton =[tex]c= 2.0 \times 10^6[/tex] m/s
The threshold energy of the proton is [tex]E = 3.4 \times 10^{-18} J[/tex]
The proton's wavelength is expressed as follows:
λ=hc/E
h is the Planck constant in this situation.
Now substituting the values,
λ= [tex](6.63\times 10^{-34}J/s\times 2.0 \times 10^{6} m/s)/3.4\times 10^{-18} J[/tex]
=3.9x 10^-10 m
=0.39nm
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What happens to the flow velocity and erosive power of a stream during a high discharge event if levees have been created to confine flow to the channel? (remember q = wdv)
The chance that one, and only one, of the dice will land acer is It could boost the river's erosive force and flow rate.
When water from rain, snowmelt, and groundwater is brought to the surface, steam flow starts. Drainage systems are created in a way that effectively removes water from the land. Moving sheetwash, a thin water surface layer, is where streamflow starts. As it descends the sharpest slope, the water begins to erode the surface by forming tiny rill channels. Larger channels form as the rills merge, deepen, and downcut. Headward erosion, often known as rapid erosion, lengthens the channel upslope. Smaller tributaries join a bigger stem stream as neighboring channels merge over time.
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[U03 L03-1] Which option below is the best description of velocity?
1.how long it takes for the object to move
2.the change in position divided by 3.the change in time
4.the position divided by change in time
5.how far an object has moved
the change in rate divided by the
The best description of velocity is
How far an object has moved the change in rate divided by the....
50 POINTS HELP QUICK
For each scenario below, identify the opposite reaction force. 1) A baseball bat hits a ball. 2) A bowling ball pushes up against the pins. 3) Air particles push outward against a balloon. 4) During an earthquake, tectonic plates move
A baseball bat hits a ball is typical example of opposite reaction force.
What is Newton's third law of motion?Newton's third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.
The third law is also known as the law of action and reaction.
Examples of Newton's third law of motionA horse pulls a cart, a person walks on the ground, a hammer pushes a nail, magnets attract paper clipA baseball bat hits a ballThus, a baseball bat hits a ball is typical example of opposite reaction force.
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Answer in units of m/s.
Answer:
The metre per second (m/s) is the unit of both speed (scalar quantity) and velocity in the International System of Units (SI).
