The Deceleration required by the to avoid the pileup is 4.71m/s².
The car is travelling with a speed of 82 km/h. The driver starts to apply breaks at a distance of 55 m.
The minimum deceleration required to make the car stop to avoid a pileup is given by,
a = u²/2s
u is the initial velocity,
a is the negative acceleration,
s is the displacement of the car,
The speed is 82 km/h, converting it, the speed is 22.77m/s.
Putting values,
a = 22.77 x 22.77/2 x 55
a = 4.71m/s².
The negative acceleration or the deceleration required is 4.71m/s².
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An egg is dropped from a treehouse and takes 1.51.51, point, 5 seconds to reach the ground. We can ignore air resistance.
What is the egg's displacement?
An egg is dropped from a treehouse and takes 5 seconds to reach the ground. We can ignore air resistance. The egg's displacement will be 122.5 m
The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.
Using equation of kinematics
v = u - g*t
v = - 9.8 * 5 = 49 m/s
2as = [tex]v^{2} - u^{2}[/tex]
2 * (-g) * s = [tex]v^{2} - u^{2}[/tex]
2 * 9.8 * s = [tex](49)^{2}[/tex] - 0
s = 122.5 m
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a solenoid and bar magnet are shown. suppose the bar magnet was moving to the right, away from the solenoid, at a constant velocity. what direction would you expect the induced magnetic field to be in? expressing your answer using points a and b labeled below, what direction should the induced current flow in the solenoid to produce this induced magnetic field?
According to Lenz's law direction of the induced current is in such a way that it opposes the change in magnetic flux. So the direction of the induced magnetic field will be along the axis of the solenoid and towards the magnet. and the direction of the induced current will be clockwise.
As the bar magnet moves relative to the solenoid the solenoid's magnetic field changes. Therefore, a current is induced in the magnetic coil, which induces a magnetic field. The induced current is counterclockwise when viewed from the direction of the increasing magnetic field.
The direction of the field can be determined by the right grip rule. For a single long straight wire, the direction of the electric field is given by placing the right thumb in the direction of the current and bending the fingers in the direction of the electric field. As the bar magnet moves freely, it oscillates until one end moves toward the Earth's North Pole and the other toward the Earth's South Pole.
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after the switch is closed for a long time it is opened. what is the current through r1 immediately after the switch is opened?
The current through R1 immediately after the switch is opened which has been closed for a long time is 0.5 A ( up )
Vc = V30Ω + V10Ω
Vc = I R2
Vc = Voltage across capacitor
V30Ω = Voltage across 30Ω resistor
V10Ω = Voltage across 10Ω resistor
I = Current
R2 = Resistance across resistor 2
I = 2 A
R2 = 10 Ω
Vc = 2 * 10
Vc = 20Ω
V = I R
V30Ω = 30 I
V10Ω = 10 I
Vc = V30Ω + V10Ω
20 = 30 I + 10 I
20 = 40 I
I = 1 / 2
I = 0.5 A ( up )
Therefore, the current through R1 immediately after the switch is opened is 0.5 A ( up )
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What potential difference is needed to make a current of 5 a flow through a material with resistance of 2 ohms?.
The potential difference needed to make a current of 5 A flow through a material with resistance of 2 ohms is 10 volts.
Potential difference also known as voltage is defined as the work required per unit charge to move a test charge between two points.
The SI unit of potential difference is Volt (V)According to the ohms law voltage is directly proportional to the current, i.e. voltage is equal to the product of current and resistance.
Mathematically, V = IR
Current = 5 A
Resistance = 2 ohms
Voltage = I *R
V = 2 * 5
V = 10 volts
The potential difference is needed to make a current of 5 a flow through a material with resistance of 2 ohms is 10 volts.
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Training intensity determines the specific adaptations that occur in response to the training stimulus. As training intensity increases, training volume must be reduced, and vice versa.
Increased intensity throughout a workout, whether it be aerobic or anaerobic, improves insulin sensitivity, raises lactate threshold, and accomplishes a number of other benefits.
What level of exercise do you do?A person's level of effort during exercise in relation to their maximum effort is referred to as training intensity.Determines how hard a person works out when lifting weights is: Maximum lifts in number. maximal lifts, number of sets, and duration of the session. zone of interestYour heart rate An objective measurement of workout intensity is your heart rate. Exercise intensity is typically inversely correlated with heart rate during physical activity.Increased intensity throughout a workout, whether it be aerobic or anaerobic, improves insulin sensitivity, raises lactate threshold, and accomplishes a number of other benefits. Athletic performance will improve and weight loss will be more effective and efficient.To learn more about Training intensity refer to:
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While skydiving, Dee Selerate opens her parachute and her 45.0-kg body immediately accelerates upward for an instant at 8.14 m/s/s. Determine the upward force experienced by Dee during this instant.
The upward force experienced by Dee during the instance is 366.3 N
How do I determine the upward force?According to Newton's law, we understood that force, mass and acceleration are related by the following formula:
Force (F) = mass (m) × acceleration (a)
F = ma
With the above formula, we can determine the upward force experienced by Dee. Details below.
From the question given above, the following data were obtained:
Mass (m) = 45.0 KgAcceleration (a) = 8.14 m/s/sUpword force (F) =?Force = mass × acceleration
Upword force = 45 × 8.14
Upword force = 366.3 N
Thus, the upword force is 366.3 N
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You are running late to school and need to go 1,500 m in 10 minutes. What speed will you travel?.
The required average speed to reach the school will be 2.5 meters per second.
According to the question,
School is still 1500m away and it starts in 10 minutes. We need to determine at what average speed you need to travel to reach the school on time.
What is speed?
Speed is defined as when an object is subjected to move, the distance covered by the object in a certain time interval is the speed of that particular object.
Here it is given,
Distance = 1500m
Time = 10 minutes or 10×60(seconds) = 600 seconds
Speed = distance/time
Speed = 1500/600
Speed = 2.5 meters per second
Thus, the average speed needed to reach the school at a distance of 1500m in 10 minutes will be 2.5 meters per second.
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What’s the four-letter type of adapter that’s used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power?.
AC Adapters the four-letter type of adapter that’s used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power.
Mobile phones, laptop computers, and external hard drives are just a few of the everyday electronic gadgets that can be powered or recharged using alternating current (AC) adapters. An AC adapter converts AC power from an outlet into the voltage or kind of power that is required by an electronic device.
An AC adapter is an external power source that transforms the direct current (DC) required by an electronic device from the alternating current (AC) found in a wall outlet. It is an AC/DC converter as a result. It's also accurate to call it a charger when it powers a battery-operated item.
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a flywheel, initially at rest, has a constant angular acceleration. after 9 s the flywheel has rotated 450 rad. its angular acceleration in rad/s2 is:
A flywheel, initially at rest, has a constant angular acceleration. after 9 s the flywheel has rotated 450 rad . Its angular acceleration in rad/s2 is 11.11 [tex]rad/s^{2}[/tex]
theta = u*t + 1/2 * α * [tex]t^{2}[/tex]
450 = 0 + 1/2 * α * [tex](9)^{2}[/tex] (initially the flywheel is at rest , u =0)
α = 450 / 81
= 11.11 [tex]rad/s^{2}[/tex]
Its angular acceleration in rad/s2 is 11.11 [tex]rad/s^{2}[/tex]
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What is determined by the distance at which the lowest potential energy is achieved and the distance at which positive charges have the least repulsion?.
The positive charges in the two nuclei start to repel one another as the atoms get closer to one another, which raises the potential energy.
The distance at which the lowest potential energy is attained determines the bond length.The number of bound electrons determines the bond's length (the bond order). The greater the attraction between the two atoms and the shorter the bond length are, the higher the bond order. The sum of the covalent radii of the two atoms is typically how long the connection between them is.The diagram shows how the potential energy of the system drops as the atoms first start to interact because the attractive attraction outweighs the repulsive force. Keep in mind that the system's stability increases as potential energy decreases.To know more about positive charge
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Calculate the temperature increase ΔT in a 1.40 kg sample of water that results from the conversion of 19% of the gravitational potential energy directly to heat energy in the world's tallest waterfall, the 807-m ‑tall Salto Angel in Canaima National Park, Venezuela.
The temperature increase is 0.24°C.
Solution:
Gravitational potential energy = mgh
= 1.4*9.8*807 = 11072.04 J
19% of PE = heat energy
0.19*11072 = mcΔ
1439.3652 = 1.4*4186*Δ
Δ = 0.24° C
so the temperature increase is 0.24°C.
Gravitational potential energy is converted to thermal energy at the fire point. When an object high above the ground heats a surface or other object, it produces thermal energy through friction and vibration. When an object falls from a great height, gravitational potential energy is converted into kinetic energy.
When you hit something and stop falling, all the kinetic energy is converted into heat. When the light is turned on, potential energy travels through the wires and is converted into light and heat, which are forms of kinetic energy. The gravitational potential energy at large distances is directly proportional to mass and inversely proportional to the distance between them. The gravitational potential energy increases with the increase.
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An oven mitten prevents which heat transfer method
Answer:
oven mitt covering your hand (figure 70.27). This is an example of rapid heat transfer by the heating of a solid, the oven mitt.
Explanation:
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How does the energy production in a high-mass, main-sequence star differ from energy production in the sun?.
High mass stars produce energy at a faster rate and use carbon in a process that fuses hydrogen to helium.
What is energy ?
Energy, in physics the ability to do work. It can exist in electrical, kinetic, thermal, electrical, chemical, nuclear, or various other forms. There is also heat and work. H. Energy in transfer from one object to another. After transmission, energy is always referred to according to its nature. Thus, the heat transferred can become thermal energy, while the work done can appear as mechanical energy. All forms of energy are associated with movement. For example, any object has kinetic energy when it is in motion. A taut device such as a bow or spring can create motion even when stationary. Because of its composition, it contains potential energy. Similarly, nuclear energy is potential energy as it results from the composition of subatomic particles within the nucleus.
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Sarah is working on physics equations and ends up needing to find the value of
5(4 −8) + 7 −2(-8 + 5)
What value should Sarah get?
Sarah will get - 7 after solving this equation
BODMAS is a rule to explain order of operations in calculations. BODMAS stands for Brackets, Order, Division, Multiplication, Addition, Subtraction. '
5(4 −8) + 7 −2(-8 + 5)
5(-4) + 7 - 2(-3)
-20 + 7 + 6 = -7
Sarah will get - 7 after solving this
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how is the period of time during which the marble is being flicked completely different from the rest of the trip?
The marble is being flicked during a very short period of time compared to the rest of the trip. The marble is accelerating during this time, so its velocity is changing. The rest of the trip, the marble is not accelerating, so its velocity is constant
What is the marble's velocity?
The marble's velocity might vary from 3 m/s to 9 m/s.The length and speed of a marble's motion are measured after that, using the formula Speed = Distance / Time to determine their speed.The marble travels at its fastest speed just before it lands because that is when its potential energy changes the most, while other factors have lost the least energy up to that point.To learn more about marble velocity, follow the link https://brainly.com/question/16978117
.
How would sound be affected if there was no matter to vibrate?
A) The sound would have a higher pitch.
B) There would be no sound.
C) The sound would be louder.
D)The sound would have a lower pitch.
(HELPPPP ASAP!!)
Sound would be affected if there was no matter to vibrate, and there would be no sound.
option B is the correct answer.
What is mechanical wave?
Mechanical wave is a type of wave that requires material medium for its propagation.
That is, for mechanical wave to be effective, there must be a material medium for its propagation.
The examples of mechanical wave include the following;
water waves, sound waves, and seismic waves.The above mentioned examples of mechanical wave requires material medium for their propagation.
Thus, a sound wave which is an example of mechanical wave will be affected in the absence of material medium for their propagation.
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two stars, a and b, have the same size (10rsun). if star a is main sequence star, and star b is a giant, how do their temperatures compare?
If 2 stars, a & b is the same size, and star a is main sequence star, and starsb is a giant, then in term of temperatures star a is hotter than star b.
Main sequnce stars including sun, lie along a diagonal the band in the H-R Diagram. They have temperature characteristic from 3,000 to >50,000K.
Meanwhile the giant stars, they are brighter than main sequence stars but with the same effective temperatures.
Therefore, from the characteristic of main sequence stars, the comparation of temperatures is star a is hotter than star b.
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6. A Saturn V rocket is launched straight up with a constant acceleration of 18 m/s².
After 150 secs. (a) how fast is the rocket moving and (b) how far has it traveled?
Answer:
below
Explanation:
vf = at = 18 (150) = 2700 m/s
d = 1/2 a t^2 = 1/2 ( 18)(150^2) = 202.5 km
what is a positive persuasive effect? how do you maximize positive persuasive effects? what is a negative persuasive effect (reference boomerang effect in your answer)?
The positive persuasive effect is the good thing happening on the wrong path
Positive persuasion can be maximized by changing the attitude.
The negative persuasive effect is that bad thing happens on the wrong path
The persuasion effect should shape consumer attitudes and evaluations of a product and ultimately influence their purchasing decisions.
But positive effects show good things that can happen when people take a course of action or go down the wrong path. Negative persuasive arguments show the bad things that can happen when people don't follow a certain course of action or do something wrong. These are the types of persuasive effects
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If a substance containing neutral atoms can be compressed a lot so that the atoms move closer together and the space between them decreases substantially, the substance is most likely a gas. solid. liquid. plasma.
Answer: gas
Explanation:
Describe the 2 main steps in protein synthesis, along with the key molecules involved in the process.
The two main steps in protein synthesis , along with the key molecules involved in the process include the following below:
Transcription -DNA is converted to mRNATranslation - mRNA is converted to protein.What is Protein?This is referred to as a biomolecule which contains amino acids and it is necessary for the growth and repair of worn out tissues in the body. They are broken down in the body by enzymes known as protease and are easily denatured by heat and chemicals.
In the process of transcription, the gene is converted into a template molecule called messenger RNA (mRNA) and involves the transfer of genetic materials.
Translation on the other hand involves protein synthesis in the ribosome in which the mRNA is converted into protein thereby making it the correct choice.
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The 75 kg girl is standing on a platform 15 m above the top of the launcher.
Calculate the gravitational potential energy of the girl relative to the top of the launcher. Show your calculations and include units in
your answer.
The girl steps off the platform and lands on the launcher.
Answer:
11250
Explanation:
E=mgh=75*10*15=11250
An object free falls for 3 seconds. A.) What is the object's acceleration after 3 seconds? B.) What is the object speed after 3 seconds?
During free fall, the motion is under gravity so the acceleration due to gravity is constant at 9.8m/s², and the speed is 29.4 m/s.
Freefall is described as a state of affairs while a frame is shifting handiest underneath the impact of the earth's gravity. in view that outside pressure is appearing at the ball, the motion may be extended. This free-fall acceleration is likewise known as acceleration because of gravity.
A motion under gravity refers to the movement of an object whose vertical movement is stricken by the presence of gravity. The pressure that draws gadgets downwards is GRAVITY. In fact, gravity works closer to the center of the Earth. Newton's regulation of universal gravitation is normally stated as that each particle attracts each other particle in the universe with a force that is proportional to the made from their hundreds and inversely proportional to the square of the gap among their facilities.
For speed:-
V = U + at
= 0 + 9.8 × 3
= 29.4 m/s
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g a car is being driven at a rate of 40 ft/sec when the brakes are applied. the car decelerates at a constant rate of 19 ft/sec2. how long before the car stops? round your answer to one decimal place.
The car stops after travelling a distance 42.1 ft.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction is displacement.
Given parameters:
Initial velocity of the car; u = 40 ft/sec.
Final velocity of the car; v = 0 ft/sec.
Deceleration of the car; a = 19 ft/sec².
We have to find, distance travelled by the car before stops; d = ?
For decelerated motion, we know that;
v² = u² - 2as
Putting all values, we get;
0² = 40² - 2×19×s
⇒ s = (40×40)/(2×19)
= 42.1 ft.
Hence, distance travelled by the car before stops is 42.1 ft.
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