The relative velocity of car A with respect to car B is -20m/s.
What is velocity?This refers to the movement of an object/body showing its direction. It is measured in meters per second, m/s.
What is relative velocity?This refers to the difference in velocities between two points.
From the question :the velocity of car A= 30 m/s
the velocity of car B= 50 m/s
Calculating the relative velocity of car A with respect to car B:relative velocity of car A with respect to car B =velocity of car A -velocity of car B
relative velocity of car A with respect to car B = 30 m/s - 50 m/s
=-20m/s
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physics who invented the lightning rod? group of answer choices nikola tesla benjamin franklin micheal faraday albert einstein
Benjamin Franklin invented lightning rod and suggested that pointed conductors were the best option for avoiding damage.
Lightning rod: Franklin started to consider ways to protect people, houses, and other things from lightning in 1750 in addition to seeking to demonstrate that lightning was electricity. This eventually led to his lightning rod invention. Franklin spoke of an iron rod that was about 8 or 10 feet long and had a pointy end. Before it could get close enough to cause an impact, he said, "the electrical fire would, I imagine, be dragged out of a cloud softly." Franklin made the decision to conduct his own lightning experiment two years later. Surprisingly, he never sent letters about the fabled kite experiment; the only account was written by someone else 15 years after it happened.For more information on lightning rod kindly visit to
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two resistors are wired to a battery.(a) in which arrangement, parallel or series,are the potential differences across each resistor and across the equivalent resistance all equal? (b) in which arrangement are the currents through each resistor and through the equivalent resistance all equal?
In a parallel arrangement, the potential difference across each resistor and the equivalent resistor is equal.
When two resistors are connected in parallel, the voltage across both resistors is the same. Battery current is divided between the two resistors. If two resistors are connected in series, the current through both resistors will be equal. The battery voltage is divided between the two resistors. The largest resistor has the largest voltage across it. In parallel, the resistors are all connected together at one end and all connected together at the other end. The potential difference across each resistor is equal, and the sum of the currents is equal to the total current going into (and out of) the parallel connection.
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A ball was kicked from ground with an initial velocity 4 m/s. at an angle
of 30° above the horizon.
a) At what time does the ball fall back and hits the ground?
b) What is the horizontal range of the projectile?
The ball will hit the ground after 0.408 sec and the horizontal range of the projectile is 1.414 m.
What is Projectile Motion?When a particle throws obliquely near the surface, it follows along a curved path under constant acceleration directed towards the center of the earth. The path followed by the particle and the motion is called projectile motion.
Consider the 'u' is the initial velocity of the particle and θ is the angle with the horizon,
The time of the flight = (2u sinθ)/g
The horizontal range (R) = (u² sin2θ)/g
Given, the initial velocity of the projectile, u 4 m/3
The angle above the horizon, θ = 30°
The time the ball falls back and hits the ground (t):
t = (2u sinθ)/g = (2 × 4 sin30)/9.8 = 0.408 s
The horizontal range (R) of the projectile = (u² sin2θ)/g
R = (4² sin60)/9.8
R = 1.413 m
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how much work is required, using an ideal carnot refrigerator, to remove 1 j of heat energy from helium at 4 k and eject this heat to a room temperature (293 k) environment?
71.43 J of work is required, using an ideal Carnot refrigerator, to remove 1 j of heat energy from helium at 4 k and eject this heat to a room temperature (293 k) environment
coefficient of performance = T / ΔT
= 4 / 293 - 4 = 0.014
Qc (heat) = work * coefficient of performance
work = Qc / coefficient of performance
= 1 / 0.014 = 71.43 J
71.43 J of work is required
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the crankshaft in a race car goes from rest to 3240 rpm in 3.3s how many revolutions does it make while
The crankshaft will undergoes 89 revolution.
Revolution can be defined as the action of a celestial body moving along an orbit or elliptical path.
Revolution of the crank shaft can be calculated by the second equation of rotational motion, θ = ut + 0.5 at²
θ = distance covered in radians
u = initial velocity of the crankshaft = 0 rad/sec
t = time taken to complete all the revolutions
a = angular acceleration
Angular acceleration can be calculated by the first equation of rotational motion, a = (v-u)/t
v = 3240 rpm = (3240 * 2 * [tex]\pi[/tex]) / 60 = 339.3 rad/sec
a = (339.3 - 0)/ 3.3
a = 102.81 rad/sec²
Putting the value of 'a' in equation θ = ut + 0.5 at²
θ = 0 *3.3 + 0.5 * 102.81 * (3.3)²
θ = 559.80 rad
θ = 560 rad
n = no of revolution = θ/2[tex]\pi[/tex]
n = 560/2[tex]\pi[/tex]
n = 89.12 = 89 revolutions
The crankshaft in a race will undergo 89 revolution when it goes from rest to 3240 rpm.
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in which spatial technique do objects placed lower on the picture plane appear to be closer than objects placed higher on the picture plane?
High-low placement is a spatial technique do objects placed lower on the picture plane appear to be closer than objects placed higher on the picture plane
It is an illusion to the eye created by the artist , to give a 3 Dimension effect on a picture plane . It is very obvious that we can only show 2D on plane , but to also show changes in z axis , this technique is been used
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About how much greater is the gravitational force exerted by the moon on the near side of the earth than on the far side?.
The near side of the Earth is 12740 km closer to the Moon than the far side. As a result, the near side experiences a gravitational force that is 7% stronger than the far side.
The gravitational attraction of the moon on Earth is what primarily causes ocean tides to rise and fall. The gravitational pull of the moon creates two bulges of water in the Earth's oceans: one where the pull is strongest and the ocean waters face the moon, and the other where the pull is weakest and the ocean waters face away from the moon.The surface gravity of the Moon is around 1/6th as strong, or 1.6 meters per second every second. Because the Moon is significantly less massive than Earth, its surface gravity is weaker. The surface gravity of a body is inversely related to the square of its radius but directly proportional to its mass.To know more about gravitational force
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a(n) ? high voltage meter is a voltmeter specifically designed to take measurements on high voltage cables.
Contact High Voltage Voltmeter.The gadget is often put through high voltage testing to ensure that it can function safely under the specified electrical conditions.
A voltage metre, usually referred to as a voltmeter, is a device that measures the voltage, or potential difference, between two points in an electrical or electronic circuit. While some voltmeters are made to work with circuits that use alternating current (AC), others are made to work with circuits that use direct current (DC).. Radio frequency (RF) voltage can be measured using specialised voltmeters.
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a ball of mass m is attached to a light string of length l. the ball is held with the string horizontal as shown in the diagram below. then, the ball is released. what is the tension in the string when the ball is at its lowest point?
Therefore, the tension in the string at its lowest point is equal to the weight added to the required centripetal force.
The rope tension is always directed towards the center of the circle. Below it means tension is UP and gravity is DOWN. At the top, downward gravity provides the necessary centripetal force. Therefore the voltage is 0. At the bottom, tension must provide the necessary centripetal force and balance gravity equal to mg downwards. Zero voltage is loose. Strings and ropes are often idealized as dimensions with length but no mass and zero cross-section.
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What happens to a molecule with a bond dipole when the electric field is turned on.
When the electric field is turned on, the dipole moment ends up aligned parallel to the external electric field.
What is dipole ?
There are two types of dipoles in electromagnetism.
The electric dipole deals with the separation of positive and negative charges found in electromagnetic systems. A simple example of this system is a pair of charges of equal magnitude and opposite sign, usually separated by a short distance. (A permanent electric dipole is called an electret.)
A magnetic dipole is a closed circuit in the current system. A simple example is a single wire loop with a constant current. An electric or magnetic dipole can be characterized by the vector quantity dipole moment. In a simple electric dipole, the electric dipole moment points from a negative charge to a positive charge and has a magnitude equal to the strength of each charge multiplied by the distance between the charges. (To be exact:
The "dipole limit" should always be considered when defining the dipole moment. For example, the generated charge spacing should converge toward 0, but at the same time the charge strength should diverge toward infinity so that the product does not change. positive constant)
For a magnetic (dipole) current loop, the magnetic dipole moment passes through the loop (according to the right-hand grip rule) with a magnitude equal to the current in the loop multiplied by the area of the loop.
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two blocks with masses of 3.0 kg and 1.0 kg respectively are placed on a frictionless surface. the two blocks are touching. a net force of 12.0 n is applied to the 3.0 kg block. calculate the magnitude of the force that the larger block (m) is exerting on the smaller block (m).
The force that the larger block (m) is exerting on the smaller block is 4 N.
Force is a push or pulls upon an item because of the object's interaction with some other object. pressure is a power that can exchange the motion of an object. A force can reason an object with mass to alternate its speed, i.e., to boost up. pressure also can be described intuitively as a push or a pull. A force has each significance and course, making it a vector amount.
Calculation:-
mass = 3 kg
force applied = 12 N
a = 12/3
4 m/s²
mass of a smaller object = 1 kg
F = ma
= 1 * 4
4 N
The phrase 'Force' has a unique meaning. At this degree, it is absolutely appropriate to describe a force as a push or a pull. A force is not something that an object consists of or 'has in it. A force is exerted on one object through another. The concept of a force isn't always restricted to living matters or non-living matters.
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5. A satellite of 2.15 x 104 kg is moving around a planet. What is the acceleration of the satellite, if the planet
radius is 4.28 x 107 m, and the mass is 2.36 x 1029 kg? Estimate G as 6.67 x 10-11 N (m/kg)
a. 4.25 x 10³ m/s²
b. 8.59 x 103 m/s²
c. 6.21 x 10³ m/s²
d. 4.92 x 106 m/s²
e. 8.12 × 104 m/s²
The acceleration of the satellite which is moving around the planet is
7.824 x 10²¹m/s².
Mass of a satellite of moving around a planet = 2.15 x 10⁴kg
The radius the planet = 4.28 x 10⁷ m
The mass of the planet = 2.36 x 10²⁹kg
Gravitational constant = 6.67 x 10⁻¹¹ N (m/kg)
Acceleration of the satellite is calculated as :
[tex]a = \frac{G m}{R^2}[/tex]
where,
G = gravitational constant
m = mass of object
R = radius.
a = (6.67 x 10⁻¹¹ N(m/kg) x 2.15 x 10⁴kg )/( 4.28 x 10⁷ m)²
a = 7.824 x 10²¹m/s².
The acceleration of the satellite which is moving around the planet is
7.824 x 10²¹m/s².
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Although ________ satellites are the most expensive to build and launch, they also have the longest orbital life of many years.
Although GEO Satellites are the most expensive to build and launch, they also have the longest orbital life of many years.
A satellite or artificial satellite tv for pc is an object intentionally located in orbit in an outer area. besides passive satellites, most satellites have an electricity generation gadget for devices on board, consisting of solar panels or radioisotope thermoelectric turbines.
In fact, they make a contribution to our nicely-being and give us the chance for us to fulfill many crucial needs and demanding situations in the world. they are beneficial in lots of fields, which include Earth commentary, communications, navigation, and science. satellite tv for pc statistics helps: guide the economic system.
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identify a characteristic of torque that may be described as clockwise (negative) or counterclockwise
A torque's characteristic direction can be categorized as either clockwise or counterclockwise.
What do you mean by torque?The rotational counterpart of linear force is torque. Depending on the subject of study, it is also known as the moment, moment of force, rotating force, or turning effect. It represents a force's ability to cause a change in the body's rotational motion.
Describe magnitude.Magnitude is referred to as an object's maximal size and direction.
A torque's characteristic direction can be categorized as either clockwise or counterclockwise.
It is possible to describe the direction of a torque as clockwise or counterclockwise, and the magnitude of the torque produced by a given force is equal to Fd.
A torque's characteristic direction can be categorized as either clockwise or counterclockwise.
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Characteristics, such as field name and data type, are_____ that define a field.
Characteristics, such as field name and data type are properties that define a field.
What are the properties of a given discipline or research field?The properties of a given discipline or research field are those that characterize the use of a particular type of information within the range of the attained field.
For example, genomics is a field characterized to make use of sequencing data, which refers to the linear order of nucleotides in the DNA sequence to provide useful information about the gene content and the presence of regulatory non-coding sequences.
Therefore, with this data, we can see that the properties of a given discipline or research field are mainly associated with the type of information that such discipline uses to make predictions in a given research and they are also related to the outcomes we can expect from such data.
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PLEASE HELP DUE TODAY I DONT KNOW WHAT TO PUT ILL DO ANYTHING (I’ll use your thing put in my own words) PLESSEE I NEED THIS ASAPPPPP
Answer:
you should search it up and the answer is you need to find out what the word is and connect it to a food web like producers.
Explanation:
if you do a food web you would probably get half extra credit which would be good you need to write about biaocummation is and connect it to a food web you can do any like producers, consumers, decomposers and so on if it won't really be right copy the question, write the answer and say you want to redo it but im only a 5th grader so don't blame it on me if you might get it wrong. its the only way......
what two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space, where you see and hear the explosion at the same time?
The two physics mistakes that occur in science fiction movies that show a distant explosion in outer space, where you see and hear the explosion at the same time are:
Firstly, in outer space, there is no air or other material to propagate sound.
Second, if there were air or any material then the faster-moving light would reach you before the sound.
Moreover, to travel to us from outer space, the wave must be able to travel through regions of space which are essentially a vacuum. Sound requires a medium to propagate in, so we would not be able to hear the explosion.
Sound and light travel at very different speeds - light travels about a million times faster than sound, so the explosion could not be seen and heard at the same time, it would be heard later.
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a piano tuner stretches a steel piano wire with a tension of 765 n. the steel wire has a length of 0.600 m and a mass of 4.50 g .
The Frequency will be "266.14 Hz" and the number of loops is "be 60".
Given:
Tension,
765 N
Length,
0.600 m
Mass,
4.50 g
As we know,
→ Linear density,
μ=[tex]mass/length[/tex]
By substituting the values, we get
4.5×10⁻³/0.6
=7.5×10⁻³
The fundamental frequency will be:
→ F=1/2L√T/μ
=266.14Hz
and,
The number of loops will be:
→ n=f'/f
=16000/266.14
=60
Thus the above response is correct.
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John take measurements of position vs. time and plots the points on a graph. Find the slope of the line connecting the points (9, -8) and (-9, -7). Leave your answer as a decimal correct to three decimal places.
The slope of the line connecting the points (9, -8) and (-9, -7) will be
- 0.056
x1 = 9
y1 = -8
x2 = -9
y2 = -7
m = ( y2 - y1 ) / ( x2 - x1 )
= -7 + 8 / -9 - 9
= 1 / - 18 = - 0.056
The slope of the position vs. time graph will be - 0.056
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Semiconductor materials with band gaps greater than 3. 5 ev are considered to be a?.
Semiconductor materials are categorized as insulators if their band gaps are bigger than 3 and 5 eV.
An electron can easily move from the valence band to the conduction band in the presence of external thermal energy because semiconductor materials have low but finite band gap energies. The usual band gap energy range of semiconductor materials is 0.5eV–3eV.
Contrary to ordinary semiconductors like silicon, which have bandgaps in the range of 0.6 to 1.5 eV, wide-bandgap materials have bandgaps above 2 eV. In a p-type semiconductor, the majority of the carriers are holes, while the minority are electrons.
The advancement of communications, computing, healthcare, military systems, transportation, clean energy, and numerous more uses is made possible by semiconductors, which are a crucial part of electronic equipment.
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For an enzyme that displays michaelis-menten kinetics, what is the effect on km of doubling the concentration of substrate?.
Tripling the enzyme only increases the number of workers who still happen to randomly collide with the vast quantities of substrate while operating at 50% of their capacity.
When the enzyme is administered, the Km does not vary regardless of how or in what ways the condition changes because the Km is only tied to the enzyme.Since Km is a constant, raising the substrate concentration has no impact on it at all. According to the relationship between Km and substrate concentration, Km is the substrate concentration at which the enzyme-catalyzed reaction occurs at a rate that is half that of the maximal reaction rate, or Vmax.The delta G of a reaction won't change if the enzyme concentration is doubled. Specialized proteins called enzymes are employed to catalyze or hasten chemical reactions. Despite speeding up the reaction as a whole, they have no impact on the net energy change.To know more about enzyme
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what does the mass of a black hole need to be in order for its mass divided by its volume to be equal to the density of water (1g/cm3) ?
The mass of a black hole needs to be in order for its mass divided by its volume to be equal to the density of water (1g/cm³) is 7x10²¹ solar masses or 1.45 x 10⁵⁵g
A black hole is a collapsed star where all of the mass is concentrated into a single point in space. As it is a point, there is no volume. Therefore the density of the singularity is therefore infinite regardless of mass which is given by,
Density = Mass/Volume
Density =Mass/0
Density=Infinite
However, it is said that black holes have an event horizon, which is said to be the point where light is "captured" by the black hole. If we assume this event horizon is a spherical boundary for the black hole, then we can use its volume for our density calculation instead of the singularity.
Effectively, we could able to calculate the "average" density within the event horizon. The radius of the event horizon is called the Schwarzschild Radius, and can be found using the following formula,
R = 2MG/c²
where M is the mass of gravity, G is the gravitational coefficient and c is the speed of light. The volume of the spherical horizon could be computed as,
V = πR²
On substituting the value of R to this formula we get,
V = π(4M²G²)/c⁴
Density = c⁴/π(4MG²)
M = c⁴/4πPG²
If we consider the density to be the density of water that is 1g/cm², then mass could ve computed as,
[tex]M = \frac{(3*10^{8})^{4} }{3.14*4*1*(6.6743*10^{-11})^{2} } \\M = \frac{(3*10^{8})^{4}}{12.56*44.52*10^{-22}} \\M = \frac{81*10^{32}}{559.2833*10^{-22}}} \\[/tex]
M = 0.14482 x 10⁵⁴
M = 1.45 x 10⁵⁵ g
In more meaningful terms, this could be approximated to 7×10²¹ solar masses, within the range of stellar black holes.
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The colors violet, blue, green, yellow and red with their respective wavelengths ranging from 400nm to 650nm are from what part of the spectrum specifically.
Answer:
Explanation:
This is visible light.
The colors violet, blue, green, yellow and red having the given range of wavelength, comes at the part of visible light in the spectrum.
What is meant by electromagnetic spectrum ?Electromagnetic spectrum is the arrangement of electromagnetic radiations in the order of their increasing frequency and decreasing wavelength.
Here,
The colors violet, blue, green, yellow and red are given according to their wavelengths ranging from 400 nm to 650 nm.
The electromagnetic spectrum includes the various radiations, which are arranged accordingly from the longest to shortest wavelength and from the lowest to the highest frequency.
The spectrum includes the range from the radio waves to gamma rays.
In this, the radio waves lies in the frequency range of about 3 x 10¹¹ Hz and wavelength greater than 1 nm and the spectrum extends upto the gamma rays that lies in the frequency range of 10²⁰- 10²⁴ Hz and wavelength less than 10⁻¹²m.
The given data of colors have a wavelength range of 400 nm to 650 nm. Therefore, the given colors can be placed at the part of visible light whose wavelength lies between 400 nm to 750 nm, in the spectrum.
Hence,
The colors violet, blue, green, yellow and red having the given range of wavelength, comes at the part of visible light in the spectrum.
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a car is driving over a hill with a radius of curvature of 60 meters. how fast mustthe car be going in order for the driver to feel weightless?
A car is driving over a hill with a radius of curvature of 60 meters . With a speed of 24.25 m/s the car be going in order for the driver to feel weightless
m[tex]v^{2}[/tex] / r + Normal = mg
for weightless Normal = 0
m[tex]v^{2}[/tex] / r = mg
v = [tex]\sqrt{rg}[/tex]
v = [tex]\sqrt{60 * 9.8}[/tex] = 24.25 m/s
A car is driving over a hill with a radius of curvature of 60 meters. With a speed of 24.25 m/s the car be going in order for the driver to feel weightless
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If a 2 kg rock has 196 j of gravitation potential energy, calculate the height of the rock to the nearest meter.
Answer: 10 meters
Explanation:
Gravitational potential energy equation= [tex]E_{G[/tex]=mgh
When we rearrange using Algebra we get [tex]h=\frac{E_{G} }{mg}[/tex]
Plugging everything in we get [tex]h=\frac{196J}{(9.80m/s^2)(2kg)}[/tex]
Final answer is 10 meters
What is brewster’s angle for light traveling in water that is reflected from crown glass?.
The correct answer of Brewster’s angle is 48.8 degrees.
What is light's Brewster angle as it travels through water?
Brewster's law is the name of this equation, and the angle it defines is known as Brewster's angle. Brewster's angle for visible light is around 56° for a glass medium in air (n2 = 1.5), while it is roughly 53° for an air-water interface (n2 = 1.33)
The inverse tan of n 2 over n 1 is what is known as Brewster's Angle. Therefore, 48.8 degrees is the inverse tan of 1.52 divided by 1.33.
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Which object weighs more on Earth (g=10 m/s2)?
The object (2) in the table is the object that would weigh highest on earth.
What is the mass of each of the materials?We know that the mass of the object would be constant irrespective of the place where the object is weighed. The weight of the object on the other hand is dependent on the location where the object is weighed. If the object is weighed on earth, the weight of the object would be dependent on the value of the acceleration due to gravity of the object.
Let us obtain the masses of each of the materials;
Using force = mass * acceleration
mass = force/acceleration
1) 80 /5.5 = 14.5 Kg (Weight = 145 N)
2) 55/2.0 = 27.5 Kg (Weight = 275 N)
3) 23/3.7 = 6.2 Kg (Weight = 62 Kg
4) 63/6.0 = 10.5 Kg (Weight = 105 N)
The weight of the object (2) is the heaviest on earth.
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A worker drives to work each morning, always leaving at the same time. When he drives at
an average speed of 30km/hr he arrives six minutes early, but when he drives at an average
speed of 20km/hr he arrives six minutes late. What is the distance between his house and his
office? Calculate his average speed when he arrives precisely on time. Explain your answer.
Explanation:
speed = distance/time
distance/speed = distance / distance/time = time
when we define the equations, we must be careful to use the same scales as in the given numbers.
as we are dealing with km/h for speed, we need to have distance measured in km, and time in hours.
6 minutes is therefore 1/10 of an hour (1 hour = 60 minutes).
distance/30 = x - 1/10
distance/20 = x + 1/10
we subtract equation 2 from equation 1 :
distance/30 = x - 1/10
- distance/20 = x + 1/10
-----------------------------------
distance/30 - distance/20 = -2/10
we multiply by 60 to eliminate all fractions :
2×distance - 3×distance = -2×6 = -12
-distance = -12
distance = 12 km
x = the travel time to arrive on time.
distance/30 = x - 1/10
12/30 = x - 1/10
12 = 30x - 3
15 = 30x
x = 15/30 = 0.5 hours = 30 minutes
so, he has half an hour for his 12 km trip to work to arrive precisely on time.
that means his average speed for that must be
12/0.5 = 24/1 = 24 km/h
A 12. 0-kilogram cart is moving at a speed of 0. 25 meter per second. After the speed of the cart is tripled, the inertia of the cart will be.
The object's beginning speed is reported as 0.25 m/s because inertia depends on mass, which is constant and equal to 12 kg; however, if the object is tripled, the
What is speed used for? Who defines speed?In order to feel more focused and alert and occasionally to feel euphoric, teenagers, young adults, and the others use a variety of stimulant drugs commonly known as "speed." Some people also employ a variety of speeds to curb their appetites.
Why is speed so crucial?You muscles lack strength, intimidation, and might without speed. Simply for display and to assist friends who are moving large pieces of furniture. The good news is that with the appropriate kind of fitness training, you can increase your speed.
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what is the angular momentum of a 0.310 kg ball rotating on the end of a thin string in a circle of radius 1.45 m at an angular speed of 10.6 rad/s ?
4.76 kg [tex]m^{2} / sec[/tex] will be the angular momentum of a 0.310 kg ball rotating on the end of a thin string in a circle of radius 1.45 m at an angular speed of 10.6 rad/s
L = m*v*r
m = mass
v = velocity
r = radius
L (angular momentum ) = m*v*r
= 0.310 * 1.45 * 10.6
= 4.76 kg [tex]m^{2} / sec[/tex]
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