Which of the following BEST describes a comet?
Answers
A comet is a celestial object primarily composed of ice, dust, rock, and other organic compounds. It typically has a nucleus, which is a solid core surrounded by a coma—a glowing, gaseous envelope—and often exhibits a tail that points away from the Sun due to solar radiation pressure. Comets generally follow elongated orbits around the Sun and can occasionally be visible from Earth during their close approaches.\(\huge{\mathcal{\colorbox{black}{\textcolor{lime}{\textsf{I hope this helps !}}}}}\)
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Related Questions
3 resitor is connected in series to a 6 resior and a 12-v battery.what is the current in each of the resistors ? what is the voltage drop across each resitor?
Answers
The current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.
When three resistors are connected in series with a six resistor and a 12-volt battery, the total resistance of the series circuit is R = R1 + R2 + R3 + ...
The current flowing through the circuit is the same at every point. So, if we want to know the current flowing through each resistor, we need to use Ohm's law, I = V/R, where V is the voltage of the battery and R is the resistance of each resistor.
I1 = V/R1 = 12/3 = 4 AI2 = V/R2 = 12/6 = 2 AI3 = V/R3 = 12/3 = 4 A. The voltage drop across each resistor can be calculated using Ohm's law, V = IR.
V1 = I1R1 = 4 x 3 = 12 VV2 = I2R2 = 2 x 6 = 12 VV3 = I3R3 = 4 x 3 = 12 V.
Therefore, the current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.
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with the enterprise of video-gaming technology growing every year, researchers have ercently become interested in the effects of violent video games
Answers
Meta-analysis indicates that violent video games increase aggressive thoughts, aggressive affect, and aggressive behavior.
What are the effects of Violent video games ?Children who play violent video games have increased aggressive cognitions, aggressive behavior, psychological arousal as well as antisocial behavior.
Furthermore, exposure to violence in the games leads to desensitization- “a reduction in emotion-related physiological reactivity to real violence”The downside of video games is that the more time children and teens spend playing violent video games the more likely they are to display aggressive behavior.Learn more about Violent video games here:
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imani is in a specialty clinic, sitting in a chair. she is about to receive a treatment that scientists believe will produce less side effects by targeting specific brain areas using short magnetic pulses from a coil held next to her head. anesthesia will also be unnecessary, further reducing negative side effects. what treatment will imani be receiving?
Answers
Imani is likely to be receiving Transcranial Magnetic Stimulation (TMS) treatment.
What is magnet?Magnetism is a physical quality mediated by a magnetic field that refers to the ability to create attracted and repulsive occurrences in other substances. Diamagnetic materials are those that magnetize freely when put in a magnetic field. However, the magnetization is oriented in the opposite direction as the magnetic field. These materials' magnetism is referred to as diamagnetism. Magnetism is a component of the broader phenomenon of electromagnetic. The most well-known effects occur in ferromagnetic materials, which are highly attracted by magnetic fields and may be magnetized to become permanent magnets, hence creating magnetic fields. It is also feasible to demagnetize a magnet.
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In the classical projectile problem, in the vertical direction, the acceleration is the negative of the gravitational acceleration (g) and a term (αv) due to the friction with the air medium. Mathematically, for the viscous air resistance, the vertical velocity satisfies the following. dv/dt+αV+g=0 where v is the velocity, α is friction coefficient and g are the gravitational acceleration. Assuming; v(0)=520 m/s,g=9.8 m/s2, and h=0.04, and employing the Euler method to find out how long the shot takes to reach its maximum height [i.e., v(t)=0] for the following cases: i. α=0 (no friction) ii. α=0.034 (light friction) iii. α=0.136 (considerable resistance)
Answers
Using the Euler method, the time taken for the projectile to reach its maximum height (v(t) = 0) is approximately 7.5 seconds for all three cases: i) no friction (α = 0), ii) light friction (α = 0.034), and iii) considerable resistance (α = 0.136).
To find the time taken for the projectile to reach its maximum height, we can solve the differential equation dv/dt + αv + g = 0 using the Euler method. The Euler method approximates the solution by discretizing time steps.
v(0) = 520 m/s, g = 9.8 m/s², and h = 0.04.
Using the Euler method, the iterative formula for each time step is:
v(i+1) = v(i) + (dv/dt) * h
where v(i) represents the velocity at the ith time step, (dv/dt) is the derivative of velocity at time i, and h is the time step.
To find the time taken for v(t) to reach 0 (maximum height), we iterate until v(i) becomes negative (indicating the projectile has reached its peak).
For each case:
i) α = 0 (no friction),
ii) α = 0.034 (light friction),
iii) α = 0.136 (considerable resistance),
we use the same iterative formula and iterate until v(i) becomes negative. The time taken for this to happen is approximately 7.5 seconds for all three cases.
Therefore, using the Euler method, the time taken for the projectile to reach its maximum height is approximately 7.5 seconds for all cases.
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A boat is pulling a water skier along. There is a force on the water produced by the engine propeller. This force causes the boat to move.
Answers
Answer: this was the answer you were looking for -
Explanation
A physical quantity X is connected from X = ab2/C. Calculate percentage error in X, when percentage error in a,b,c are 4,2 and 3 respectively.
Answers
Answer: 11%
Explanation:
Given that
X = ab^2/C. Calculate percentage error in X, when percentage error in a,b,c are 4,2 and 3 respectively.
Percentage error of b = 2%
Percentage error of b^2 = 2 × 2 = 4
When you are calculating for percentage error that involves multiplication and division, you will always add up the percentage error values.
Percentage error of X will be;
Percentage error of a + percentage error of b^2 + percentage error of c
Substitute for all these values
4 + 4 + 3 = 11%
Therefore, percentage error of X is 11%
a table tennis ball has a diameter of 3.80 cm and average density of 0.084 0 g/cm3. What force is required to hold ir completely submerged under water?
Answers
The amount of force necessary to keep it submerged in water is F=0.258N.
The force required to hold a table tennis ball submerged in water is calculated using the formula:
\(F =\frac{ (\rho * V * g) }{ A}\)
Where F is the force, ρ is the water's density, V is the ball's volume, g is its gravitational acceleration, and A is its cross-sectional area.
The following formula is used to determine the ball's volume:
\(V = \frac{4}{3}*pi*r^3\)
where r is the ball's radius.
The radius of the ball is half its diameter, thus:
\(r = 3.8 cm^2\)
Therefore,
\(V = \frac{4}{3}*pi *(3.8 cm ^2)3\\V = 0.5222 cm3\)
The cross-sectional area of the ball is calculated using the formula:
\(A = \pi * r^2\\\\A = \pi* (\frac{3.8 cm }{ 2})^2\\A = 4.5257 cm^2\)
Substituting the values in the above formula,
\(F =\frac{ (0.084 g/cm^3 * 0.5222 cm^3 * 9.8 m/s^2) }{4.5257 cm^2}\\F = 0.258 N\)
Hence, the force needed to keep it submerged in water is 0.258N
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A car traveling in a straight line has a velocity
of 3.58 m/s at some instant. After 6.72 s, its
velocity is 11.9 m/s.
What is its average acceleration in this time
interval?
Answer in units of m/s
.
Answers
Answer: 1.2381 m/s
Explanation:
vf=vi + at
11.9 = 3.58 + a(6.72)
8.32 = a(6.72)
1.2381 m/s = a
TRUE/FALSE. if an object remains at rest, then the sum of both the external torques and the external forces on the object must be zero.
Answers
It is true if the sum of both the external torques and the external forces on an object is zero, then the object must be at rest .
What happens when object remains at rest?Newton's First Law states that an object with no net forces acting on it which is initially at rest will remain at rest. If it is moving, then it will continue to move in a straight line with constant velocity.
If net external force on a system of particles is zero then the velocity of the center of mass of the system must also be constant. A body is said to be in rest if it does not change its position continuously with respect to surroundings and with the passage of time.
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What's the kinetic energy of the roller coaster at the top and bottom of the hill? Use KE
mu
A kiddie roller coaster car has a mass 100 kilograms. At the top of a hill, it's moving at a speed of 3 meters/second. After reaching the bottom
of the hill, its speed doubles. The car's kinetic energy at the bottom is
v its kinetic energy at the top. The car has
joules of kinetic energy at the bottom of the hill.
Reset
Next
Answers
The kinetic energy of the car is four times greater at the bottom than it is at the top. At the base of the hill, the car's kinetic energy is 1800 joules.
Describe kinetic energy.The momentum an object has as a result of motion is known as kinetic energy. We must exert force on an object if we desire to accelerate it. To apply a force, we must exert effort. Once the work is finished, the objects will be moving because energy has now been transferred to it.
What elements influence the kinetic energy?Describe that a travelling internal force and speed are major factors that impact the amount of kinetic energy it will possess. Partially particles can result in the loss of kinetic energy through frictional, sound, and heat.
k = 1 /2 mv²
K = 1 /2 (100 kg) (3 m/s)²
= 450 J
K = 1 /2 (100 kg) (6 m/s)²
k = 1800 J
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b. (1 pt) exactly what does a catalyst do to change the the rate of the reaction? (assume the temperature does not change.)
Answers
A catalyst increases the rate of a reaction by providing an alternative pathway with a lower activation energy.
It does not change the overall energy change or equilibrium constant of the reaction. Catalysts work by stabilizing the transition state, making it easier for reactant molecules to overcome the energy barrier and form products. This allows more successful collisions to occur, resulting in an increase in reaction rate.
Catalysts are not consumed in the reaction, so a small amount can catalyze a large amount of reactants. Overall, catalysts provide an efficient and sustainable way to increase reaction rates without increasing the energy requirements or altering the reaction equilibrium.
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the weight of a body is 50N. how much force is needed to move it vertically upward with 5ms-2 acceleration
Answers
Answer:
50 Newtons
Explanation:
A body with a mass of 10 kg is moving with an acceleration of 5 m/s. What is the amount of force acting on it? The frictional force is 50N.
The force required to move vertically upward is 75N.
How are acceleration and force related?
The formula required to calculate force is mass x acceleration. This means that force is mass times acceleration i.e., those objects which has larger mass will require stronger force to move with the same acceleration as compared to object with smaller mass. This is the Newton’s second law of motion.
Weight of the body = 50 N
mg= 50 N
mx10= 50
m= 50/10= 5 kg
Fext = ma
F-50 = 5x 5
F= 25+50= 75 N .
So, the force applied vertically is 75N.
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The figure shows a horizontal pipe with a circular cross section whose diameter varies. The cross-sectional area at X is 3.0×10−4m2 and at Y is 0.60×10−4m2. Water of density 1000kg/m3 fills the pipe and flows through it at a constant rate of 2.4×10−4m3/s. The difference in pressure between X and Y is most nearly 750 Pa 750 Pa A 1600 Pa 1600 Pa B 7700 Pa 7700 Pa C 8320 Pa 8320 Pa D
Answers
By Bernoulli's Principle :
\(P_x+\dfrac{\rho v_x^2}{2}+\rho gz_x=P_y+\dfrac{\rho v_y^2}{2}+\rho gz_y\)
Since , pipe is horizontal so every point is at same height .
So , \(z_x=z_y\) .
The equation will reduced to :
\(P_x+\dfrac{\rho v_x^2}{2}=P_y+\dfrac{\rho v_y^2}{2}\) ..... 1 )
Also flow rate will be constant :
\(Q=A_xv_x=A_yv_y\)
\(v_x=\dfrac{Q}{A_x}\\\\v_x=\dfrac{2.4\times 10^{-4}}{3\times 10^{-4}}\ m/s\\\\v_x=0.8\ m/s\)
\(v_y=\dfrac{Q}{A_y}\\\\v_y=\dfrac{2.4\times 10^{-4}}{0.6\times 10^{-4}}\ m/s\\\\v_x=4\ m/s\)
Now ,
\(P_x-P_y=\dfrac{\rho v_y^2}{2}-\dfrac{\rho v_x^2}{2}\\\\P_x-P_y=\rho[\dfrac{ v_y^2}{2}-\dfrac{v_x^2}{2}]\\\\P_x-P_y=1000\times [\dfrac{ 4^2}{2}-\dfrac{0.8^2}{2}]\\\\P_x-P_y=7680\ Pa\)
Difference in pressure between X and Y is most near to 7700 Pa.
Hence, this is the required solution.
When does the Northern Hemisphere receive more of the Sun’s thermal energy than the Southern Hemisphere?
a. When the North Pole is tilted away from the Sun.
b. When the North Pole is tilted toward the Sun.
c. The North Pole never receives more of the Sun’s thermal energy.
d. When the Earth is closer to the Sun during its orbit.
Answers
Answer:
B
Explanation:
The Southern Hemisphere reflects a tremendous amount of radiation during the December solstice.
Northern Hemisphere receives more of the Sun’s thermal energy than the Southern Hemisphere. in the situation when the North Pole is tilted toward the Sun.
What is Sun’s thermal energy?One of the most important renewable energy sources is solar thermal energy. Solar thermal systems transform solar energy into heat.
Which may be used directly or converted into electricity for use in any application that can be served by conventional power.
The Northern Hemisphere is located well above the Equator, whilst the Southern Hemisphere is located below it.
The hemispheres include distinct quantities of land, ocean, and sea, as well as varied populations and climate patterns.
When the North Pole is tilted toward the Sun the Northern Hemisphere receives more of the Sun’s thermal energy than the Southern Hemisphere.
Hence option b is correct.
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HELP DUE 3 MINUTESSSSSSSS
Answers
Answer:
&3?.&.)/&282/8//8338/.)9
Explanation:
if a snail moves 6.5in/min, how many miles per hour does the snail travel?
Answers
Answer:
Unit Conversion
6.5in/min× 1ft/12in× 1 mile/5280ft= 0.001231 m/min0.001231 m/min× 60 min/1hr= 0.0738 miles/hr
Temperature represents the average potential energy of molecules
within a substance.
True or False
Answers
Answer:false
Explanation:
3
A student is measuring the speed of sound in air. He
hears an echo from a wall 50 m away 0.3 s after he made
the sound. Calculate the speed of sound.
Answers
Answer:
easy
speed = distance/time = 50 / 0.3 = 500/3 m/sec
Answer:jkknbfds
Explanation:jjbhfdrtb
through what vertical distance is a 5.1 kilogram object moved if 250 joules of work is done against the gravitational field of the earth?
Answers
The vertical distance of a 5.1 kilogram object moved against the gravitational field of the earth is calculated to be 5m.
When object moves upward then the work done by gravity is negative because the direction of gravity is opposite of the displacement. On the other hand, if an object moves downwards then the work done by gravity is positive as the gravity and the displacement will be in the same direction.
Work done is zero, when force and displacement are perpendicular to each another or when either force or displacement is zero.
The work done by gravity is :
W=m*g*h.
Given, m = 5.1 kg
W = 250 joules
We know that, g= -9.8m/s²( given against gravity )
h= W/ (m*g)
= 250/ {( 5.1 )* (-9.8)}
Vertical distance= 5 m
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m=mc2 what does it mean?
Answers
Answer:
this is e=mc2
Explanation:
It means that energy and mass are the same
Find f (the force) in relation to moments.
Answers
Answer:
B
Explanation:
i7tigp79ug978uyioh;
1. How does the transfer of momentum change when the velocity of the marble change?
2. How does the transfer of momentum change when the mass (number of marbles) changes?
3. How could you calculate the momentum of a single marble?
4. If two marbles together are moving at the same speed as a single marble which will have greater momentum and why?
5. Can momentum be shown as a vector? Explain why or why not?
Answers
The transfer of momentum increases when the velocity of the marble increases and vice versa.
The transfer of momentum increases when the mass (number of marbles) increases and vice versa.
The momentum of a single marble can be calculated from the product of its mass and velocity.
If two marbles together are moving at the same speed as a single marble, the two marbles will have greater momentum because of their greater mass.
Momentum can be shown as a vector because the direction of the momentum of a body is specified.
What is the momentum of a body?The momentum of a body is the product of the mass and the velocity of the body.
Mathematically;
Momentum = mass * velocitySince the velocity of an object is a vector, the momentum of a body is also a vector.
The momentum of a body is directly proportional to its mass and velocity.
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A candle with a flame 1.5cm
1.5
cm
tall is placed 5.0cm
5.0
cm
away from the front of a concave mirror. An upright, magnified, virtual image is formed 10cm
10
cm
behind the mirror. (a) Find the focal length of the mirror.
Answers
The focal length of the mirror is 3.33 cm.
What is focal length of a mirror?The distance between the pole and the focus of the mirror is called the focal length of the mirror.
The focal length of a mirror is calculated by diving the radius of curvature of the mirror by 2.
The focal length of the given mirror can be determined by applying mirror formula.
1/f = 1/v + 1/u
where;
f is the focal length of the mirrorv is the image distance (positive when image is behind the mirror and negative when the image is Infront of the mirror)u is the object distance1/f = (1/10) + (1/5)
1/f = (1 + 2)/(10)
1/f = 3/10
f = 10/3
f = 3.33 cm
Thus, the focal length of the mirror is 3.33 cm.
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How do we solve this?
\(3q - {4t}^{2} + 3t\)
Answers
Answer:
2(3t-4)+3t=4t-2
This deals with linear equations with one unknowns
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What characterizes static stretching? A. having a partner hold limbs in a stretch position B. assuming and holding a stretch position C. bouncing while in a stretch position D. using a tool or object to increase a stretch Please select the best answer from the choices provided. A B C D
Answers
Answer:
B.
assuming and holding a stretch position
Explanation:
The characteristics of static stretching is assuming and holding a stretch position.
What is static stretching?Static stretching is a type of stretch exercises in which the person involved is static position and he stretched out.
The person does not move out of his position but the person move his moves as many times as it can without experiencing any pain.
Therefore, The characteristics of static stretching is assuming and holding a stretch position.
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A 1.70 H inductor carries a steady current of 0.450 A. When the switch in the circuit is thrown open, the current is effectively zero in 10.0 ms. What is the average induced emf in the inductor during this time
Answers
The average induced emf in the inductor during this time can be calculated using the formula:
emf = L * ΔI/Δt
where L is the inductance, ΔI is the change in current, and Δt is the time interval.
In this case, the inductance (L) is 1.70 H and the change in current (ΔI) is 0.450 A (since the current goes from 0.450 A to 0 A). The time interval (Δt) is 10.0 ms, which is equal to 0.01 seconds.
Plugging in these values, we get:
emf = 1.70 H * (0 - 0.450 A)/0.01 s
emf = -76.5 V
Therefore, the average induced emf in the inductor during this time is -76.5 volts. Note that the negative sign indicates that the emf is opposing the change in current (i.e. it is a back emf).
* To calculate the average induced emf in the 1.70 H inductor during the 10.0 ms interval when the current decreases from 0.450 A to zero, you can use the formula for the induced emf in an inductor:
emf = -L * (ΔI / Δt)
where L is the inductance (1.70 H), ΔI is the change in current (0.450 A), and Δt is the time interval (10.0 ms or 0.01 s). The negative sign indicates that the induced emf opposes the change in current.
emf = -(1.70 H) * (0.450 A / 0.01 s)
emf = -76.5 V
The average induced emf in the inductor during this time is 76.5 V.
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Why does 250 N not push an object when frictional force is 188 N while 251 N is pushing with fast acceleration.
Answers
Due to the difference in net force delivered to the item in each situation, 250 N cannot push an object while the frictional force is 188 N, whereas 251 N may push the identical thing with rapid acceleration.
When there is friction, what happens to acceleration?When friction is present, an object may continue to travel at a steady speed despite the application of an external force. The friction force simply balances the applied force in this scenario. There is no acceleration since there is no net force.
Does friction increase as you go faster?No, acceleration has no impact on the kinetic friction coefficient. The type of surfaces that make contact with one other and not the speed at which they are travelling determine the coefficient of kinetic friction, which is constant.
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A roller coaster is traveling at 80m/hr until the emergency breaks turn on, causing it to come to a complete stop in 10s. What is the acceleration of the roller coaster?
Answers
This means that the roller coaster is decelerating at a rate of 8m/s² until it comes to a complete stop.
What is decelerating?Decelerating is the process of slowing down or decreasing the speed of a vehicle, person, or object. It is the opposite of accelerating, which is the process of increasing speed. Deceleration can be caused by the force of friction from the road or other surfaces, or by reducing the amount of engine power or braking. Deceleration is necessary to safely slow down and stop a vehicle and to negotiate turns or curves in the road.
The acceleration of the roller coaster can be calculated using the equation
a = (Vf - Vi)/t, where Vf is the final velocity, Vi is the initial velocity, and t is the time taken for the change in velocity to occur.
In this case, Vf = 0m/hr, Vi = 80m/hr, and t = 10s.
Therefore, the acceleration of the roller coaster is -8m/s².
This means that the roller coaster is decelerating at a rate of 8m/s² until it comes to a complete stop.
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what is theory of electromagnetism?
Answers
Explanation:
Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light.
Electromagnetic Theory covers the basic principles of electromagnetism: experimental basis, electrostatics, magnetic fields of steady currents, motional e.m.f. and electromagnetic induction, Maxwell's equations, propagation and radiation of electromagnetic waves, electric and magnetic properties of matter, and conservation laws. This is a graduate level subject which uses appropriate mathematics but whose emphasis is on physical phenomena and principles.
Small pieces of sand hitting the side of a mountain and weathering the rock is an example of what type of weathering?
Answers
Answer: This is MECHANICAL type of weathering.
Explanation:
Weathering is defined as the process by which rocks breakdown into smaller quantities due to different atmospheric and biological activities.
There are different types of weathering which include:
--> MECHANICAL WEATHERING: This type of weathering is also called physical weathering. Here, rocks are being broken down into smaller pieces but the mineral composition of the rock remains the same. This type of weathering can occur in two ways:
• By Ice wedging: this is one of the easiest ways rocks can be broken into smaller pieces. It occurs at the earth polar regions (climate that regularly cycles above and below the freezing point) and in areas of higher elevations such as the mountains. Ice wedging of rocks occurs when water seeps into cracks, it freezes and expands. This results in wedging (splitting) the rocks apart with repeated freezing.
• By Abrasion: this is another form in which mechanical weathering occurs. Abrasion occurs when strong winds carrying pieces of sand sandblast mountain surfaces. Also moving water, gravity, biological activities can cause abrasion of rock surfaces leading to its weathering.
Therefore, small pieces of sand hitting the side of a mountain and weathering the rock is an example of mechanical weathering by abrasion.