Answer:
B
Explanation:
The correct answer is B) have unlike charges. Since they are attracted to each other they have to be unlike
Final answer:
A negative value for net electrostatic force signifies that the two charged objects have unlike charges, which attract each other. So the correct option is B.
Explanation:
When calculating the net electrostatic force, a negative value indicates that the two charged objects involved have unlike charges. This is because Coulomb's Law states that the force exerted on one charged particle by another is directed away from the other particle if both have the same kind of charge, resulting in a positive value for the force, signifying repulsion. However, if the value of the force is negative, it implies attraction, as the force is directed toward the other particle; this occurs only when the charges are unlike (one positive and the other negative).
Using the reference information provided, it's clear that unlike charges exhibit an attractive force toward each other which would result in a negative value when calculated, as the direction of the force is opposite to that of repulsive force between like charges.
assume the suns total energy output is 4.0 * 10^26 watts, and 1 watt is 1 joule/second. assume 4.3 * 10^-12 J is released from each p-p chain of reactions. use the energy yield from the proton-proton chain to determine how many proton-proton chain reactions must be happening each second in the solar core
Answer:
[tex]9.3\cdot 10^{37}[/tex]
Explanation:
Power is defined as the energy produced (E) per unit of time (t):
[tex]P= \frac{E}{t}[/tex]
This means that the energy produced in the Sun each second (1 s), given the power [tex]P=4.0\cdot 10^{26}W[/tex], is
[tex]E=Pt=(4.0\cdot 10^{26}W)(1s )=4.0\cdot 10^{26} J[/tex]
Each p-p chain reaction produces an amount of energy of
[tex]E_1 = 4.3\cdot 10^{-12} J[/tex]
in order to get the total number of p-p chain reactions per second, we need to divide the total energy produced per second by the energy produced by each reaction:
[tex]n=\frac{E}{E_1}=\frac{4.0\cdot 10^{26} J}{4.3\cdot 10^{-12} J}=9.3\cdot 10^{37}[/tex]
What happens when the temperature of a substance decreases significantly?
A.
Most substances will expand.
B.
Most substances will gain atoms.
C.
Most substances will disappear.
D.
Most substances will contract.
Answer is .... A I think
Answer:
D. Most substances will contract
Explanation:
I took the test; this is the correct answer (:
which of your muscles push with the most force
Answer:
Wouldn't it be the muscles in your arms or legs since they have to push the most while they have gravity acting upon them?
Explanation:
in the periodic table notation below what information does the number 40.08 tell you
Answer:
The number above the symbol is the atomic mass (or atomic weight). This is the total number of protons and neutrons in an atom. The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number.
Explanation:
What is the term for a mirror with a flat surface?
A. silver mirror
B. plane mirror
C. glass mirror
D. reflecting mirror
I think flat surface mirrors are also just called plane mirrors. One way to tell even if you don't know that this is the answer is by knowing that flat mirrors have "planar reflective surfaces"
Which change will cause an increase in the electric current produced through electromagnetic induction?
Using more wire loops
Using opposite pole of magnet
Using a weaker magnet
Moving the solenoid slower
Using more wire loops
Answer:
using more wire loops.
Explanation:
When there is a change in magnetic flux linked with a coil changes, an emf is induced in the coil. This phenomenon is called electromagnetic induction.
the amount of induced emf developed is
[tex]e = \frac{d\phi }{dt}[/tex]
If there are N number of turns in the coil, then induced emf is given by
[tex]e = N\frac{d\phi }{dt}[/tex]
Induced current is given by
i [tex]i = \frac{e }{R}[/tex]
So, as number of turns increases, the current produced is also increases.
Please helppppppppp i need it pleaseee
Answer:
Earthquakes
Explanation:
A Transform boundary is a fault that occur when two tectonic plates slide sideways past each other.During the rubbing process, huge portions of rocks on both plates break to create fault lines resulting into earthquakes.The San Andrea Fault is was formed through a similar process.
If the action force of a bat striking a ball accelerates the ball in one direction, the
reaction force accelerates the bat in the ____________________ direction.
Answer:
Opposite
Explanation:
if you put 20 lbs of force into the swing then 20 lsb of force is put into the ball and the bat so think of it as two balls being thrown at each other at the same speed they will hit each other and stop because the force cancels out
i hope this helps and sorry if im wrong
If a bat hits a ball and sends it in one direction, the bat will be accelerated in the opposite direction. This is based on Newton's third law of motion which states that for every action, there is an equal and opposite reaction.
Explanation:The laws of physics state that for every action, there is an equal and opposite reaction. This is known as Newton's third law. If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the opposite direction. This means that if the bat propels the ball to the left, the bat would be driven to the right and vice versa. This is why a players' hand can feel a sting or shock when hitting a baseball, which is the bat being accelerated in the opposite direction by the reaction force.
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when jacob bats a baseball with a net force of 4.719N , it accelerates 33 m/s squared, what it the mass of the baseball
Force is given by m*a
thus
4.719/33 = 0.143 kg
that's 143 grams
What's the difference between meteoroids, meteorites, and meteors?
You're talking about a grain of sand or a stone or a rock that's drifting in space, and then the Earth happens to get in the way, so the stone falls down to Earth, and it makes a bright streak of light while it's falling through the atmosphere and burning up from the friction.
-- While it's drifting in space, it's a meteoroid.
-- While it's falling through the atmosphere burning up and making a bright streak of light, it's a meteor.
-- If it doesn't completely burn up and there's some of it left to fall on the ground, then the leftover piece on the ground is a meteorite.
Which of the following is a speed value. 95m, 125m/s, -35.2m/s
Answer:
125 m/s
Explanation:
95 is just a measurement of length, depth, or width
You can't go -35.2 m/s
For this case we have by definition, that the speed is a scalar quantity that determines the relation of the distance traveled by a body or object and the time it needs to cover said distance.
So:
95 meters, represents a distance.[tex]125 \frac {m} {s}[/tex], is a scalar quantity (Speed)[tex]-35.2 \frac {m} {s}[/tex], Represents a velocityANswer:
Option B
With what velocity must a 0.53 kg softball be moving to equal the momentum of a 0.31 kg baseball
moving at 21 m/s?
Final answer:
The velocity at which the softball must be moving to equal the momentum of the baseball is 12.30 m/s.
Explanation:
To find the velocity at which the 0.53 kg softball must be moving to equal the momentum of the 0.31 kg baseball, we can use the equation for momentum:
Momentum = mass × velocity
First, let's find the momentum of the baseball:
Momentum of baseball = 0.31 kg × 21 m/s = 6.51 kg·m/s
Now, we can set the momentum of the softball equal to the momentum of the baseball and solve for its velocity:
Momentum of softball = 6.51 kg·m/s
0.53 kg × velocity = 6.51 kg·m/s
velocity = 6.51 kg·m/s / 0.53 kg = 12.30 m/s
Therefore, the softball must be moving at a velocity of 12.30 m/s to equal the momentum of the baseball.
choose the ray diagram that correctly locates the image formed by a convex lens. the object is located between the focal point and the 2F position
Answer: The first ray diagram
Explanation:
A convex lens is thicker in the center than at its edges and concentrates (converges) at a point the rays of light that pass through it.
Now, the lens shown in the image is a biconvex lens, which is still convergent.
For the specific case in which the object is positioned between the focus F and point 2F, the image produced will be real and inverted.
With real image means that it can be projected on a screen if it is placed just where the rays converge after passing through the lens.
Then, the option that is closest to this fact is the first figure.
Answer:
A the first one
A student runs a 400m race around the school track in 65 seconds. At the start of the race, the student accelerates to a speed of 6.0m/s during the first 2.2 seconds. Calculate the magnitude of their acceleration, assuming it is constant.
Answer:
2.7 m/s²
Explanation:
Average acceleration is change in velocity over change in time. Assuming the acceleration is constant, we can say it is equal to the average:
a = Δv / Δt
a = (6.0 m/s - 0 m/s) / 2.2 s
a ≈ 2.7 m/s²
In an experiment, Seth was given a substance known as ammonium carbonate, (NH4)2CO3. Seth connected a bunsen burner to the gas valve using a gas hose. He turned on the gas valve and lit the bunsen burner. Using a test tube, Seth heated a piece of ammonium carbonate. Seth noticed the following:
- Condensation appeared on the sides at the top of the test tube.
- An ammonia smell was coming from the test tube.
Seth continued to light a wooden splint and stick it down the test tube and it immediately was extinguished.
Throughout this experiment, how many signs of chemical changes were observed and actual chemical changes took place?
A)4B)5C)6D)7
Answer:
its 5
Explanation:
Chemical change shows the change in the chemical composition during an experiment. Seth observed 5 signs of chemical changes during the experiment.
what is a chemical change?when a substance reacts chemically with another substance in order to form a new substance causes decomposition of that substance into two or more substances. The following reaction only takes place due to certain changes during the reaction known as chemical change.
Seth observes signs as follows
The burner is lighting.
The condensation appeared on the top of the test tube.
A smell was coming from the tube.
There is a light a wooden splint occurs.
when he lit the wooden splint it was immediately extinguished.
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a platinum bar measures 5.0 cm long, 4.0 cm wide and 1.5 cm thick. it has a mass of 700.0 grams
Answer:
23.3 g/cm3
Explanation:
First of all, this should be in the math section. I just so happen to also be good at math. Cheers!
We have that for the Question "a platinum bar measures 5.0 cm long, 4.0 cm wide and 1.5 cm thick. it has a mass of 700.0 grams" it can be said that The density of the platinum bar is
[tex]\rho=23.33g/cm^3[/tex]
From the question we are told
a platinum bar measures 5.0 cm long, 4.0 cm wide and 1.5 cm thick. it has a mass of 700.0 grams
Generally the equation for the density is mathematically given as
[tex]\rho=\frac{m}{V}\\\\Therefore\\\\\rho=\frac{m}{V}\\\\\rho=\frac{700}{5*4*1.5}\\\\[/tex]
[tex]\rho=23.33g/cm^3[/tex]
Therefore
The density of the platinum bar is
[tex]\rho=23.33g/cm^3[/tex]
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What type of material is found in the asthenosphere?
A. Solid rock
B. A mixture of magma and superheated water
C. A viscoelastic fluid of molten rock
D. An incompressible fluid of molten rock
Answer:
The correct answer is option C.
Explanation:
The layer below the lithosphere , the upper layer of the mantle of the earth with high heat pressure .It is made up of almost solid rocks but also flows not which indicates that it consist of viscoelastic fluid of molten rocks.This is because in some regions there can be presence of molten rocks.
Answer:
C.
Explanation:
5. Which type of energy resource is hamessed beneath the Earth's surface? A. biomass B.solar C.hydroelectric D.geothermal
It's called geothermal energy, and is present due to the incredible amount of heat present in Earth's interior from radioactive decay, friction, and residual heat from Earth's formation.
What happens when light strikes a translucent object?
A)
All of the light passes through the object.
B)
All of the light is reflected by the object.
C)
None of the light can pass through the object.
D)
Some of the light passes through, and some of the light is absorbed or scattered by the object.
Answer:
D) Some of the light passes through, and some of the light is absorbed or scattered by the object.
Explanation:
When light strikes translucent materials, only some of the light passes through them. The light does not pass directly through the materials. ... When light strikes an opaque object none of it passes through. Most of the light is either reflected by the object or absorbed and converted to heat.
(I googled it) ☺
Answer:
D
Explanation:
Its the answer on my usatestprep
What is the equivalent resistance of a 7ohm resistor and a 93 ohm resistor connected in parallel? PLEASE HELP ASAP
Answer:
≅6.5Ω
Explanation:
In the series resistor circuit, the electric current flows only one path. In the parallel resistor circuit, the current divides and circulates through several paths. These resistances are joined by their two extremes.
The equivalent resistance of a resistor circuit in parallel is equal to the reciprocal of the sum of the inverse of the individual resistors.
For the general case with "n" resistances in parallel the formula is:
[tex]\frac{1}{R_{n} }=\frac{1}{R_{1}}+ \frac{1}{R_{2}} +\frac{1}{R_{3}}+....\frac{1}{R_{n} }[/tex]
Solving for R1 = 7ohm and R2 = 93ohm
[tex]\frac{1}{R_{n} }=\frac{1}{7ohm}+ \frac{1}{93ohm}}[/tex]
[tex]\frac{1}{R_{n} }=0.143ohm+0.011ohm\\\frac{1}{R_{n} }=0.154ohm\\R_{n}=\frac{1}{0.154} ohm\\R_{n}=6.503ohm[/tex]
.
What is the voltage across a resistor
oltage across a resistor of 3 ohms that carries a current of 15 amps? NEED TO KNOW ASAP PLEASE HELPPPPPPP
Answer:
45 V
Explanation:
The voltage across the resistor can be found by using Ohm's law:
[tex]V=RI[/tex]
where
R is the resistance
I is the current
In this circuit,
[tex]R=3 \Omega[/tex]
[tex]I=15 A[/tex]
Therefore, the voltage across the resistor is
[tex]V=(3\Omega )(15 A)=45 V[/tex]
Voltage = (current) x (resistance) <== memorize this formula
Voltage = (15 Amperes) x (3 ohms)
Voltage = 45 volts
What is the downward pull on an object due to gravity?
Answer:
The weight of the object
Explanation:
The downward pull on an object due to gravity is equal to the weight of the object, which is given by
[tex]W=mg[/tex]
where
m is the mass of the object
g is the acceleration due to gravity (on Earth surface, g=9.8 m/s^2)
The weight is a force so it is measured in Newtons (N).
Note that while the mass of an object (m) depends only on the properties of the object, so it does not depend on the location, the weight of the object depends on the value of g, which can change depending on the location (for instance, on the Moon g is 1/6 of the value on Earth), so the weight is not constant.
a cell phone company relies on which kind of waves in order to provide service for its customers
Answer:
Microwaves
Explanation:
Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) wavelengths, but relatively short for radio waves. this is why a cell company would use microwaves to provide service
hope this helps!
It’s Halloween and time for the costume dance and you just can’t wait. You think you have everything planned perfectly – and are dressed like GREASE! On your way to the dance though there is some slow driving person in front of you, so you slam on the gas going from 30. mi/hr to 60. mi/hr. Luckily your date brought a stop watch and told you the whole thing took place in 10.5s. What is your acceleration and how far did you date go?
Answer:
1.3 m/s², 210 m
Explanation:
Average acceleration is change in velocity over change in time.
First, convert to SI units.
30. mph ≈ 13.4 m/s
60. mph ≈ 26.8 m/s
a = Δv / Δt
a = (26.8 m/s - 13.4 m/s) / 10.5 s
a = 1.28 m/s²
Rounded to 2 sig-figs, your acceleration is 1.3 m/s².
The distance traveled is:
x = x₀ + ½ (v + v₀)t
x = (0 m) + ½ (26.8 m/s + 13.4 m/s) (10.5 s)
x = 211 m
Rounded to 2 sig-figs, you and your date traveled 210 m.
Final answer:
The acceleration of the car was approximately 1.27728 m/s², and the distance traveled during the acceleration was approximately 211.69242 meters.
Explanation:
To calculate the acceleration, we can use the formula:
a = (Vf - Vi) / t
Where Vf is the final velocity, Vi is the initial velocity, and t is the time. Plugging in the values given, we get:
a = (60 mi/hr - 30 mi/hr) / 10.5s
To make the units consistent, we should convert the velocities from miles per hour to meters per second. Since 1 mi/hr is approximately equal to 0.44704 m/s, after conversion we get:
a = (26.8224 m/s - 13.4112 m/s) / 10.5s = 1.27728 m/s²
To find the distance traveled during acceleration, we use the formula:
d = Vi*t + 0.5*a*t²
Substituting the known values, we find:
d = 13.4112 m/s * 10.5s + 0.5 * 1.27728 m/s² * (10.5s)² = 140.8176 m + 70.87482 m
The total distance traveled by your date during the acceleration is approximately 211.69242 meters.
When a star dies, which of these celestial objects is it most likely to help create? A. a planet B. a star C. a moon D. a meteor E. a comet
Answer:
B
Explanation:
When a star dies, it is most likely to help create a star, therefore the correct answer is option B
What is Chandrasekhar's limit?
Chandrasekhar's limit is a type of maximum limited value that is used to define the maximum mass of a white dwarf star. The generally internationally considered value of the Chandrasekhar limit is about 1.44 times the mass of the sun which is approximately 2.765×10³⁰ kg.
In other words, one can say that the Chandrasekhar limit is the maximum value that can attain 1.44 times the solar mass.
A high-mass star expands and transforms into a red supergiant when it runs out of gas to burn. The supergiant stars, known as supernovae, obliterate themselves in a tremendous explosion while the majority of stars slowly fade away. Massive star deaths can result in the formation of new stars.
Thus, The correct response is option B because when a star dies, it most likely contributes to the creation of another star.
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Two spacecraft are 13,500 m apart and moving directly toward each other. Spacecraft#1 has velocity 525 m/s and accelerates at a constant -15.5 m/s2. They want to dock, which means they have to arrive at the same position at the same time with zero velocity. These aliens are watching in anticipation. (a) What should the initial velocity of the spacecraft#2 be? (b) What should be #2 constant acceleration?
Answer:
-272 m/s, 8.03 m/s²
Explanation:
Let's call position 0 the point where the two spacecrafts meet. Let's say spacecraft #1 starts x units to the left of 0 and spacecraft #2 starts 13500-x units right of 0.
For spacecraft #1:
v = 0 m/s
v₀ = 525 m/s
a = -15.5 m/s²
x = 0 m
x₀ = -x
The distance that spacecraft #1 travels is:
v² = v₀² + 2a(x - x₀)
(0 m/s)² = (525 m/s)² + 2(-15.5 m/s²)(0 m − -x)
0 = 275625 − 31x
x ≈ 8891 m
The time it takes to reach 0 velocity is:
v = at + v₀
0 m/s = (-15.5 m/s²) t + 525 m/s
t ≈ 33.87 s
For spacecraft #2:
v = 0 m/s
x = 0 m
x₀ = 13500-x ≈ 4609 m
t = 33.87 s
Using the same equations:
v² = v₀² + 2a(x - x₀)
(0 m/s)² = v₀² + 2a(0 m − 4609 m)
0 = v₀² − 9218a
v = at + v₀
0 m/s = a(33.87 s) + v₀
0 = 33.87a + v₀
Now we have two equations and two variables. We can solve the system of equations.
First, let's solve for a and substitute:
0 = 33.87a + v₀
a = -v₀ / 33.87
0 = v₀² − 9218 (-v₀ / 33.87)
0 = v₀² + 272 v₀
0 = v₀ (v₀ + 272)
v₀ = -272 m/s
Now we can find the acceleration:
a = -(-272) / 33.87
a = 8.03 m/s²
By utilizing the equations of motion, you can calculate the exact time it will take for the first spacecraft to come to rest and then apply this to find the acceleration needed for spacecraft#2 to stop in the same time. Additionally, using these equations, we can figure out the initial velocity of spacecraft#2.
Explanation:To find the initial velocity and constant acceleration for spacecraft #2, we can use the basic principles of physics. The equations of motion are our primary tool in this context, which state that the final velocity of an object is equal to its initial velocity plus acceleration multiplied by time, and the displacement of an object is equal to its initial velocity multiplied by time plus one-half of its acceleration multiplied by time squared.
If both spacecraft are to meet at the same time and come to rest (which means final velocity equals zero), then spacecraft#1 and #2 should cover half the distance each, i.e., 6750 m. Thus, we can use the first equation of motion for spacecraft #1 to find the time it takes for it to come to rest. If we calculate the time, we can use that to determine the constant acceleration required for spacecraft #2 to come to rest in the same time using the second equation of motion. Similarly, the initial velocity of spacecraft #2 can be obtained.
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oxygen is inhaled and is then distibuted throughout the bloodstream is what two body systems?
Respiration and Circulation
Hope that helped
A________ is a group of organs that work together to perform a common function.
Answer:
organ system
Explanation:
An organ system is a group of organs that work together to perform a common function.
The correct answer is an Organ System
Bread dough rises because yeast produces
a. carbon dioxide
b. sugar
c. oxygen
d. water
Answer: Yeast produces carbon dioxide
Explanation: Yeasts feed on the sugars in flour and releases the carbon dioxide that makes bread rise.
Answer:
Carbon Dioxide
Explanation:
Bread dough rises because yeast produces Carbon Dioxide.
Carbon Dioxide causes the yeast to rise in the dough because Carbon Dioxide fills p any space. The dough rises because the Carbon Dioxide fills the extra space in the dough, causing the dough to get big and fluffy, aka rise.
Mordancy.
How do waves interact with water?
Answer:
Waves interact in a very unique way with the water. Waves often line up parallel to the water surface due to refraction of waves. The parallels depends on the angle from where the waves are hitting the water.
If the waves are coming from deep down the ocean at an angle to the surface, they will most probably refract towards the shallower part of the water and curve around which makes them even more parallel to the surface of water.