Answer:
C.The car appears to be moving 30 km/hr in the opposite direction of the bus.
Explanation:
There are two reference systems involved in this situation:
- Reference system S: this is the reference system where velocities are measured with respect to the ground. In this reference system, the car is parked, so its velocity is [tex]v=0[/tex]
- Reference system S': this is the reference system moving with the bus. This reference system is moving with a velocity of [tex]v_0 = +30 km/h[/tex] with respect to the reference system S
Calling [tex]v'[/tex] the velocity of the car in the reference system S', we have:
[tex]v=v_0 +v'[/tex]
From which
[tex]v'=v-v_0 = 0-(+30 km/h)=-30 km/h[/tex]
and the negative sign means that a passanger in the bus observes the car moving in the opposite direction.
Why do we always only see one side of the moon?
A. From Time to time we see all the sides of the moon from the Earth.
B. The far (opposite) side only faces the Earth during the daytime when the Sun’s light outshines the Moon.
C. The moon is tidally locked with the Earth.
D. The moon does not rotate.
The Answer would be C because it is a process called synchronous rotation. which means that one side of the moon is always facing us. or (tidal locking)
Answer:
C. The moon is tidally locked with the Earth.
Explanation:
what gives you a measurement of H + ions in osolutions
Answer:
pH is a measure of the hydrogen ion concentration in an aqueous solution. Essentially, pH measures acidity and alkalinity on a scale from 0.0 to 14.0.
Gravity can be described as (2 points)
an magnetic force found in nature.
the force that moves electrical charges.
the force that repels object with like charges.
the force of attraction between two objects
Answer:
"the force of attraction between two objects"
Explanation:
According to Newton's Universal Law of Gravitation, gravity is a force of attraction acting between objects that possess mass. The fact that we only observe gravitational attraction (as opposed to repulsion) makes gravity unique among the known forces.
Answer:
the force of attraction between two objects
Explanation:
sodium undergoes beta decay and becomes magnesium, write an equation. please help...
Remark
There are 2 kinds of Beta Decay. This one is an example of a neutron becomes a proton and the emitted particle is an electron.
[tex]_{11}^{23}\text{Na}\longrightarrow_{12}^{23}\text{Mg}+_{-1}^{ 0}\text{1e-}[/tex]
What are the changes of state
By changes of state if you mean like liquid to gas, solid to liquid etc then the the changes of state would be:
vaporization (Liquid to gas
condensation (gas to liquid)
Sublimation(solid to gas)
Deposition (gas to solid)
Melting (solid to liquid)
Freezing ( liquid to solid)
what is the state of an object accelerating due to the force of gravity alone?
Answer:
Its state is in uniformly accelerated motion
Explanation:
When an object is acted upon the force of gravity only, we said that the object is in free fall.
According to Newton's second law of motion:
[tex]F=ma[/tex]
where F is the net force on an object, m is its mass, a its acceleration, when the net force on an object (F) is non-zero, than the object accelerates (because a is non-zero), so the object is in accelerated motion.
In case of free fall, the rate of acceleration of the object is equal to [tex]g=9.8 m/s^2[/tex], the acceleration due to gravity, and it is constant. So, the object is moving by uniformly accelerated motion.
how did sonar contribute to discoveries about the ocean bottom
Answer:
Sonar can be used to measure the depth of the ocean bottom
Explanation:
Sonar is a device which uses ultrasound waves to measure the depth of the ocean.
When a sonar is used on a boat, the device emits an ultrasound wave. This wave travels from the boat to the bottom of the ocean, then it is reflected and travels back to the boat. By knowing the speed of the sound wave in water, and by measuring the time it takes for the wave to come back, one can measure the depth of the ocean. In fact:
- v is the speed of the sound wave in water (approximately 1500 m/s)
- t is the total time it takes for the wave to leave the sonar and come back
- d is the distance between the boat and the bottom of the ocean
The sound wave takes a time t to cover twice the distance between the boat and the bottom of the ocean (2d), so we have
[tex]v=\frac{2d}{t}[/tex]
So we can calculate the depth of the ocean:
[tex]d=\frac{vt}{2}[/tex]
The speed of sound in air is about 340 meters per second. How long does it take a sound wave to travel a distance of 7800 meters
22.94 seconds, or in estimation it is 23 seconds.
7,800/340, is how you find that out and so it would take
22.94117647058824 seconds
An object at rest increases its velocity to 10m/s in 3 seconds. What is its acceleration
Acceleration = (change in speed) / (time for the change)
Change in speed = (speed at the end) - (speed at the beginning).
Change in speed = (10 m/s) - (zero) = 10 m/s
Time for the change = 3 sec
Acceleration = (10 m/s) / (3 sec)
Acceleration = (3 and 1/3) m/s² or 3.333 m/s²
To calculate the acceleration, use the change in velocity divided by the time. For an object going from rest to 10 m/s in 3 seconds, the acceleration is 3.33 m/s².
The question addresses the calculation of acceleration of an object in motion. To find the acceleration, we can use the formula:
Acceleration (a) = Change in velocity (omenclature) / Time (t)
In this scenario, the object goes from rest (initial velocity, u = 0 m/s) to a final velocity (v) of 10 m/s in a time (t) of 3 seconds.
Thus, acceleration (a) is calculated as:
a = (v - u) / t
a = (10 m/s - 0 m/s) / 3 s
a = 10 m/s / 3 s
a = 3.33 m/s²
The acceleration of the object is therefore 3.33 m/s².
Our Sun will eventually:
A explode in a supernova.
B become a white dwarf star.
C become a black hole.
Answer:
B. Become a white dwarf star.
Explanation:
As the Sun is a medium size star in mid of its life of around 10 Billion years. When it will exhaust all the Hydrogen in the core, it will go through a long process of death: Converting into a red giant to Planetary Nebula to a white dwarf. It will spend trilliion of years in white dwarf phase before fading and converting to a Black dwarf.
If it had been a massive star it would have made a Supernova and then ultimately a black hole or a neutron star.
Our sun, a medium-sized star, will eventually turn into a white dwarf once its hydrogen fuel is exhausted. This is following the standard stellar evolution process. However, larger stars may explode as a supernova or form a black hole.
Explanation:Our Sun is a star of average mass and will follow the stellar evolution process of stars in its mass range. It is predicted that once it exhausts its hydrogen fuel, it will eventually expand into a red giant and subsequently shed its outer layers, leaving behind a star core. This star core will shrink under its own gravity and become a white dwarf star.
In contrast, stars significantly larger than the Sun can explode in a spectacular event known as a supernova. Very massive stars have the potential to collapse under their own gravity and form a black hole.
Learn more about Stellar Evolution here:https://brainly.com/question/32220788
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You lift a 50 N object 2 meters off the ground what work did you do on the object
how do I calculate the speed of light and the distance between the earth and the moon?
To calculate the distance to a star, astronomers observe it from different places along Earth's orbit around the Sun. If they measure the object's position several months apart, their "two eyes" will have a separation of well over 100 million miles!
Facts about thermal energy
The number three ball moves off with a velocity of 5 m/s. What is the final velocity and direction of the eight ball?
Warm blooded or cold blooded Animals are warm when their surroundings are warm and cool when their surroundings
Your answer should be Cold Blooded Animals. Cold blooded animals don't have control over their own body temperature like humans or mammals do, most times cold blooded animals are reptiles, amphibians, etc. so they have to lay on rocks or someplace in the sunlight to warm up and have to go to water or shady areas to cool off. Hope this helps! =^-^=
Carlos uses a rope to pull his car 30 m to a parking lot because it ran out of gas. If Carlos exerts 2,000 N of force to pull the rope, and the rope is at an angle of 15° to the road, how much work did he do? Round your answer to two significant figures. 1.6 × 104 J 3.5 × 104 J 5.8 × 104 J 9.0 × 104 J
Note that
[tex]W = Fd \cos \theta[/tex]
Thus, here,
W = (2000 N)(30 m)(cos 15) = 57955.54958 J
Here, we only have 2 significant figures. Hence, in 2 significant figures,
[tex]W = 5.8*10^4 \; J[/tex].
Answer:
5.8 × 10^4 J
Explanation:
Rubidium atoms are cooled to 0.20 μK in an atom trap. What is their de Broglie wavelength?
The de Broglie wavelength of rubidium atoms at 0.20 µK can be found using the de Broglie equation after determining the atoms' momentum, which involves calculating their velocities at the given temperature. Since the temperature is extremely low, the de Broglie wavelength will be relatively large.
Explanation:The student is seeking the de Broglie wavelength of rubidium atoms cooled to 0.20 µK in an atom trap. To find the de Broglie wavelength, we must first calculate the momentum of the atoms, which can be done using the temperature and kinetic theory to find the velocity and then the momentum, assuming nonrelativistic speeds. The de Broglie wavelength (λ) is given by the equation λ = h/p, where h is Planck's constant and p is the momentum of the particle.
Without knowing the exact mass of rubidium or its velocity at this temperature, we cannot calculate the specific wavelength. However, since the temperature is very low, we can expect the wavelength to be relatively large compared to what it would be at higher temperatures due to the inversely proportional relationship between momentum and wavelength.
Solve for the unknown in each of these circuits
Ohms law: This law relates voltage difference between two points. Mathematically, the law states that V=IR;
Where
V = voltage difference ; in volts
I = Current ; in Amperes
R = Resistance ; in ohms
1. Answer : given that R = 10 ; V= 12 V ; I = ?
From ohms law, I = V/R
= 12/10
= 1.2 Amp.
2. Answer: given that R = 10 ; V= ? ; I = 5
From ohms law, V = IR
= 10×5 = 50 V
3 . Answer: given that R = ? ; V= 120 ; I = 5
From ohms law, R = V/I
= 120/5
= 24 Ω
4 . Answer: given that R = ? ; V= 10 ; I = 20
From ohms law, R = V/I
= 10/20
= 0.5 Ω
5 . Answer: given that R = 480 ; V= 24 ; I = ?
From ohms law, I = V/R
= 24/480
= 0.05 A
6. Answer: given that R = 150 ; V= ? ; I = 1
From ohms law, V = IR
= 1 × 150
= 150 V
The half-life of carbon-14 is 5730 years. Explain how to figure out the age of a substance that has 25% carbon-14 remaining. A) Multiply 25% times 5730 years since only 25% of the carbon remains. B) Divide 5730 years by 2 since carbon has gone through two half-lives. C) Multiply 5730 years by 2 since two half-lives have gone by for carbon. D) Multiply 4 times 5730 years since carbon has gone through 4 half-lives.
Answer:
C
Explanation:
25% is two half lives.
Each half life requires 5730 years.
So two half lives requires
2
×
5730
Related questions
Answer: C) Multiply 5730 years by 2 since two half-lives have gone by for carbon.
Explanation:
Multiply 5730 years by 2 since two half-lives have gone by for carbon. 5730 years will go by and 50% will remain. When 25% is remaining, another 5730 years will have passed. Therefore, multiply 5730 years by 2.
What occurs in an updraft
Correct answer: Warm air from the south rises.
Which statement about he diagram is accurate
A. the forces pointing up and down are unbalanced.
B. The forces pointing in and down are balanced
C.The forces pointing right and left are balanced
D.There is a net force of 200 N to the left
B) The forces pointing in and down are balanced
300n on the top and 300n on the bottom results in it being balanced
In the given diagram, the forces pointing up and down are balanced since they are equal in magnitudes and will cancel each other in magnitude.
What is force?Force acting on an object is able to deform it or to change its state of motion or rest. Force is a vector quantity and is characterised by its magnitude and direction.
When two same or different forces are acting in the same direction on an object, the resultant force will be the sum of magnitude of the two forces. If two forces are acting in the opposite directions, they will cancel each other in magnitudes.
In the given diagram, the force acting up and down are equal thus, they will cancel each other and is said to be balanced. The net force to the right direction is 200 N since 200 from 400 N is cancelled by the force with 200 N leftwards. Hence, option b is correct.
To find more on force, refer here:
https://brainly.com/question/26115859
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You will stop your learning new tasks and skills after you are hired for your first job. Please select the best answer from the choices provided T F
Answer:
False
Explanation:
It is false that you will stop learning new tasks and skills once you are hired for your first job. Even if you have been able to obtain a job, this does not mean you can stop learning. It is likely that your job will present new challenges, and you need to be prepared for these. Moreover, you might also change jobs in the future, and knowing how to perform a wide variety of skills would most likely help you in your future.
How many hits each team permitted to have on their side(volleyball) before returning the ball to the other team?
the answer is 3
hope it helped
3 hits because it should take 3 strong hits to get it over the net.
Select the community facility which aloows for participation in extreme sports
- Bowling alley
- Golf course
- Skate park
- YMCA
Skate park, definitely.
Hope this helped!
its the skate park>....
Which image shows an inclined plane?
Which of the following is one of the three main fuels that a star uses for fusion
Answer:
OXYGEN
Explanation:
from odyssey
PLEASE HELP
When you see a traffic light turn red, you apply the brakes and stop with constant acceleration.
If your initial speed was 23 m/s , what is your average speed during braking?
Express your answer to two significant figures and include the appropriate units.
Let the initial velocity be u = 23 m/s
Let the final velocity be v.
Vehicle stops finally, therefore v = 0 m/s
Here during the braking, vehicle decelerates with constant acceleration, thus the change in velocity is linear from initial velocity to final velocity.
for the Given condition:
Write the expression for the average speed [tex]V_{avg}[/tex]
[tex]V_{avg} = \frac{u+v}{2}\\[/tex]
Substitute the values in the above expression.
[tex]V_{avg} = \frac{23+0}{2}\\ = 11.5 m/s[/tex]
Hence, the average speed during braking is 11.5 m/s
What is the kinetic energy of an object that has a mass of 30 kg and moves with a velocity of 20 m/s?
Given that:
kinetic energy of an object (K.E) = ?
mass of the object (m) = 30 Kg ,
velocity of object (v) = 20 m/s,
We know that,
Kinetic energy is a form of energy, that an object as by reason of its motion.
mathematically,
The kinetic energy of the object (K.E) = 1/2 . (m. v²)
= 1/2.(30 × 20²)
= 6000 Joules
K.E = 6000 J or 6 KJ
The kinetic energy of the object is 6000 Joules
Units ; N.m = J (energy measured in Joules)
KN.m = KJ
Answer:
Kinetic energy of the given object is 6000 J or 6 KJ.
Explanation:
We are given:
mass of the object = 30 kg; and
velocity with which the object moves = 20 m/s.
We know the formula of the kinetic energy:
Kinetic energy = 1/2 × mv[tex]^2[/tex]
Substituting the given values in the above formula to get:
Kinetic energy of object = 1/2 × 30 × 20[tex]^2[/tex] = 6000 J or 6 KJ
Four techniques used in propaganda advertising are generalization, scare tactic, exaggeration, and .
and bandwagon is another technique
The launching velocity of a missile is 20.0 m/s, and it is shot at 53º above the horizontal. What is the vertical component of the velocity at launch?
Given that
Velocity of missile (v) = 20 m/s ,
Angle of missile (Θ) = 53°
Determine , Vertical component = v sin Θ
= 20 sin 53°
= 15.97 m/s