Answer:
.
Explanation:
Answer:
d. A voltage causes electric charges to move from higher to lower potential.
Explanation:
If an object's mass is decreasing while a constant force is applied to the object, would its acceleration decrease, increase, or remain the same?
Answer:
increase
Explanation:
We need to find what change takes place to the acceleration of the object in the given situation.
The acceleration of the object would increase.
m = Mass of the object
a = Acceleration of the object
Force is given by
[tex]F=ma[/tex]
Acceleration would be
[tex]a=\dfrac{F}{m}[/tex]
It is given that force is constant so
[tex]a\propto \dfrac{1}{m}[/tex]
This means that acceleration is inversely proportional to mass.
Here, the mass is decreasing so the acceleration will increase.
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Circuit that has only one path for the current to follow
Answer:
Series circuit
Explanation:
The type of circuit can be divided into series and parallel. In the series circuit, there is only one loop/path. If the path is cut or stopped, the current of the circuit will be stopped completely. A parallel circuit has more than one loops. This means the circuit has alternative paths that it can travel in case that one path is blocked or cut. This alternative path makes the parallel circuit have a lower resistance compared to the series.
What is the acceleration of the object?
Answer:
Explanation:
Velocity is changing by a constant amount -10 m/s-in second of time.Anytime an object's velocity is changing,the object is said to be accelerating;it has an acceleration.
Answer:
[tex]\boxed{\mathrm{view \ explanation}}[/tex]
Explanation:
[tex]\displaystyle Acceleration =\frac{change \ in \ velocity}{elapsed \ time}[/tex]
[tex]\displaystyle A=\frac{V_f-V_i}{t}[/tex]
Explain how water freezing and thawing causes weathering and the type of weathering it would be considered.
Final answer:
Water freezing and thawing causes weathering through a process called frost or ice wedging. This leads to the physical weathering of rocks or soil. In areas with frequent freeze-thaw cycles, such as Iceland, this process can gradually break down rocks into smaller pieces.
Explanation:
Water freezing and thawing can cause weathering through a process called frost or ice wedging. When water freezes, it expands by about 9%, exerting pressure on the rocks or soil in which it is trapped. This pressure can cause the rocks to crack or break apart, leading to physical weathering. As the ice thaws, water seeps into the cracks and when it freezes again, it widens the cracks further, gradually breaking down the rock. This type of weathering is known as mechanical weathering. It is a significant process in areas with frequent freeze-thaw cycles.
Example: In regions with colder climates, such as Iceland, freezing and thawing of water can weather rocks over time. The repeated cycles of freezing and thawing cause the rocks to deteriorate and break down into smaller pieces, contributing to the formation of gravel, sand, and clay.
What are the advantages of parallel circuits? Check all that apply.
If one bulb goes out, the other bulbs go out.
If one bulb goes out, the other bulbs stay lit.
If there is a break in one branch of the circuit, current can still flow through the other branches.
If there is a break in one branch of the circuit, current cannot flow at all.
Parallel circuits are simple to design and build,
O Parallel circuits are complicated to design and build.
The correct answer is option (1) and (2). The advantages of parallel circuits include If one bulb goes out, the other bulbs stay lit and If there is a break in one branch of the circuit, current can still flow through the other branches.
Parallel circuits offer several advantages, and you should check the statements that accurately reflect these benefits.
Here are the advantages of parallel circuits:
1. If one bulb goes out, the other bulbs stay lit.
Correct. In a parallel circuit, each component is connected across the same voltage source. Therefore, if one component fails, the others continue to function.2. If there is a break in one branch of the circuit, current can still flow through the other branches.
Correct. In a parallel circuit, each branch operates independently. A break in one branch does not affect the operation of the other branches.3. Parallel circuits are simple to design and build.
Incorrect. While parallel circuits offer certain advantages in terms of reliability and consistent voltage, they are not necessarily simpler to design compared to series circuits. The complexity can increase with the number of branches and components.4. Parallel circuits are complicated to design and build.
Correct. Parallel circuits can be more complex to design and build than series circuits, especially as the number of branches increases. The design must ensure proper connections and consider the current distribution across each branch.5. If one bulb goes out, the other bulbs go out.
Incorrect. This statement applies to series circuits, not parallel circuits. In a series circuit, if one component fails, the entire circuit is interrupted.6. If there is a break in one branch of the circuit, current cannot flow at all.
Incorrect. In a parallel circuit, a break in one branch does not stop current from flowing through the other branches. Each branch operates independently of the others.The complete question is:
What are the advantages of parallel circuits? Check all that apply.
1. If one bulb goes out, the other bulbs go out.
2. If one bulb goes out, the other bulbs stay lit.
3. If there is a break in one branch of the circuit, current can still flow through the other branches.
4. If there is a break in one branch of the circuit, current cannot flow at all.
5. Parallel circuits are simple to design and build,
6. Parallel circuits are complicated to design and build.
A tuning fork vibrating at 512 Hz is held near one end of a tube of length that is open at both ends, as shown above. The column of air in the tube resonates at its fundamental frequency. The speed of sound in air is 340 m/s. Calculate the length of the tube.
Answer:
Length of the pipe is 33.2 cm
Explanation:
As we know that the frequency of the sound in open end pipe is given as
[tex]f = \frac{v}{2L}[/tex]
so here we will have
f = 512 Hz
v = 340 m/s
so now we have
[tex]512 = \frac{340}{2L}[/tex]
[tex]L = \frac{170}{512}[/tex]
[tex]L = 33.2 cm[/tex]
Final answer:
To calculate the length of a tube open at both ends with a given frequency and speed of sound, we can rearrange the formula ν = v / (2L) and solve for L, giving a length of 0.332 m for a 512 Hz tuning fork.
Explanation:
A tuning fork vibrating at 512 Hz is held near one end of a tube of length that is open at both ends. The tube resonates at its fundamental frequency. To calculate the length of the tube given the speed of sound in air is 340 m/s, we use the formula for the fundamental frequency of a tube open at both ends, which is ν = v / (2L), where ν is the frequency (512 Hz), v is the speed of sound (340 m/s), and L is the length of the tube we are looking for.
Rearranging the formula, we get L = v / (2ν). Plugging in the numbers, L = 340 m/s / (2 × 512 Hz) = 0.33203125 meters, which can be rounded to 0.332 m or 33.2 cm.
Jo lifts a 330 N cement block 3.6 m (using a system of pulleys) by pulling 16 m of rope with a force of 121 N.
a. What is the mechanical advantage of the pulley system?
b. What is the work input?
c. What is the work output?
d. What is the efficiency of the machine?
Answer:
a) Mechanical advantage: 2.7b) Work input: 1,936Jc) Work ouput: 1,188Jd) Efficieny: 0.61Explanation:
a. Mechanical advantage
The mechanical advantage of a system of pulleys is the ratio of the ouput force (weight of the object) to the input force (pulling force):
Mechanical advantage = output force / input forceMechanical advantage = 330N/ 121N = 2.727 ≈ 2.7b. Work input
Work is the product of the force applied by the distance traveled in the same direction:
Work input = Input force × input distance = 121N × 16m = 1,936Jc. Work output
Using the law of conservation of energy, the work output is equal to the change in the potential energy of the block:
ΔPotential energy = mass × g × heightΔPotential energy = weight × height = 330N × 3.6m = 1,188JWork output = 1,188Jd. Efficiency
The efficiency is the ratio of the work output to the work input:
Efficiency = Work input / Work outputEfficiency = 1,188J / 1,936J = 0.61You can check that the efficiency is also the ratio of the mechanical advantage to the ideal mechanical advantage
The ideal mechanical advantage is equal to the ratio of the input distance (pulling distance) to the output distance (lift distance):
Ideal mechanical advantage = 16m/3.6m = 4.444Efficiency = mechanical advantage / ideal mechanical advantageEfficiency = 2.727 / 4.444 = 0.61- Becky leaves home and rides a distance of 30 km H took her 25
hours. What is her speed?
Answer:
1.2
Explanation:
30/25=1.2 so 1.2*25=30
Answer:1.2 hours
Explanation:
distance=30km
Time=25hours
Speed=distance/time
Speed=30/25
Speed=1.2km/hr
The truck’s motor is creating 500 N of thrust, but air resistance is placing 500 N in the opposite direction
Based on the idea of isostasy, which of these statements is NOT correct?
A) Continental crust is less dense than oceanic crust.
B) The depth at which a crustal plate sits is a function of its mass.
C) When more weight is added to the crust, through a process like mountain building, it slowly sinks deeper into the mantle.
D) The formation ice sheets cause the Earth's surface to sink so much that when the ice melts, the crust and mantle does not rebound.
The formation ice sheets cause the Earth's surface to sink so much that when the ice melts, the crust and mantle does not rebound.
Explanation:
The above-mentioned statement is the only false statement
During the Ice ages, large continental parts were covered under thick ice sheets. This imposed a superincumbent additional load on the Earth's crust.
Isostasy refers to the balance that exists between parts of Earth's mantle and crust. Isostatic adjustments are a common phenomenon. As a result of isostatic adjustments, several parts of the world have risen by as much as 900 feet as an adjustment to superincumbent load since ice ages. E.g. Parts of Scandinavian countries have witnessed these activities and also undergoing this process.
Answer: d
Explanation:
Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.
When you hit a .27 kg volleyball the contact time is 50 ms and the average force is 125 N. If you serve the volleyball (from rest) sending it up at 30 degrees above the horizontal, what is the
A) vertical component of the momentum of the volleyball in kgm/s?
B) horizontal component of the momentum of the volleyball in kgm/s?
The vertical component of the momentum of the volleyball is -0.49 kgm/s and the horizontal component is 38.93 kgm/s.
Explanation:To find the vertical component of the momentum, we need to first find the vertical velocity of the volleyball. We can use the equation:
vf = vi + at
The initial vertical velocity is 0 m/s since the volleyball was sent up from rest. The final velocity can be found using the equation:
vf = vi + gt
where g is the acceleration due to gravity. Plugging in the values and solving for vf, we get:
vf = 0 + (-9.8 m/s^2)(0.05 s)
vf = -0.49 m/s
Since the downward direction is considered negative, the vertical component of the momentum is -0.49 kgm/s.
To find the horizontal component of the momentum, we can use the equation:
p = mv
where p is the momentum, m is the mass of the volleyball, and v is the horizontal velocity. The horizontal velocity can be found using:
vx = v * cos(theta)
where theta is the angle above the horizontal. Plugging in the values, we get:
vx = 45 m/s * cos(30 degrees)
vx = 38.93 m/s
Therefore, the horizontal component of the momentum is 38.93 kgm/s.
1. Identify whether the following statements describe a change in acceleration. Explain your response.
a. A car stopped at a stop sign.
b. A boat traveling east at 10 knots.
c. An airplane traveling north 600 miles per hour.
d. A person running at 5 meters/second along a curving path.
Answers:
a. Change in acceleration
b. Not change in acceleration.
c. Not change in acceleration.
d. Change in acceleration
Explanation:
Let's begin by explaining what acceleration is:
Acceleration [tex]a[/tex] is initially defined as the variation of Velocity [tex]\Delta V[/tex] in time [tex]\Delta t[/tex]:
[tex]a=\frac{\Delta V}{\Delta t}[/tex]
However, we cannot forget acceleration is a vector quantity as well (like velocity) and as a vector it has magnitude and direction.
So, when one of these aspects changes (or both) acceleration changes as well.
In other words: A change in acceleration implies the change in velocity, or a change in direction, or both.
Having this clear, we can identify the statements that describe a change in acceleration:
a. A car stopped at a stop sign.
Change in acceleration, since the car changed its velocity.
b. A boat traveling east at 10 knots.
Not a change in acceleration, since the boat is travelling at a constant velocity and is not changing its direction.
c. An airplane traveling north 600 miles per hour.
Not a change in acceleration, since the airplane is travelling at a constant velocity and is not changing its direction.
d. A person running at 5 meters/second along a curving path
Change in acceleration, since the person is changing its direction in the curving path.
Which of the following is not one of the reasons to properly warm up before exercising?
A. Develop overall flexibility.
B. Increase blood flow to the muscles and raise body temperature.
C.Prevent injuries such as strains sprains and muscle cramps.
D. Return heart rate to resting levels.
Answer:
Letter D is not a reason to warm up.
Answer:
d
Explanation:
Compare the magnitude of the electromagnetic and gravitational force between two electrons separated by a distance of 2.00 m. Assume the electrons have a mass of 9.11 × 10–31 kg and a charge of 1.61 × 10–19 C. Round to two decimal places
Answer:
1) 5.83
2) 1.38
3) 4.22
Explanation:
The electrostatic force exerted tow electrons on each other is equal to 5.83 × 10⁻²⁹ N. The gravitational force is 1.38 × 10⁻⁷¹ N.
What is coulomb's law?According to this law, the force of attraction between two charged particles can be written as the product of their charges on them and is the inverse of the square of the distance by which they are separated.
The magnitude of the electrostatic force between charges is given by:
[tex]\displaystyle F = k\frac{q_1q_2}{r^2}[/tex]
where k has a value of 8.99 × 10⁹ N.m²/C².
Given the charge on one electron, q₁ = q₂ = 1.61 × 10⁻¹⁹
The distance between these two electrons, r = 2.00 m
The magnitude of electric force between the electrons will be:
F = 8.99 × 10⁻⁹ × (1.61 × 10⁻¹⁹)²/ (2.00)²
F = 5.83 × 10⁻²⁹ N
The gravitational force between two electrons is equal to:
[tex]\displaystyle F = G\frac{m_1m_2}{r^2}[/tex]
F' = 6.674 × 10⁻¹¹ × (9.1 × 10⁻³¹)²/ (2.00)²
F' = 1.38 × 10⁻⁷¹ N
F/F' = 4.23 × 10⁴² N
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gravity has traditionally been defined as a force of attraction between things that have
The gravity has traditionally been defined as a force of attraction between things that have masses.
Explanation:
Gravitational force is a type of attractive force. It is because of this force, that we are able to walk on this Earth. Also due to gravitational force, the solar system and the galaxies are existing in the universe. Sir Issac Newton first discovered this force. He postulated the universal law of gravity. And according to this law, the gravitational force will be acting between the objects having masses and separated by a distance. So in this law, it states that gravitational law is directly proportional to the product of masses and inversely proportional to the square of the distance between them.
Thus, the gravity has traditionally been defined as a force of attraction between things that have masses.
name the three basic types of playing positions used in a basketball game.
Answer:
point guard, center, middle
Explanation:
As potential and kinetic energy increase what happens to mechanical energy?
A. Mechanical energy increases
B. Mechanical energy decreases
C. Mechanical energy stays the same
D. Mechanical energy has no relation to kinetic and potential energy
Answer:
a
Explanation:
A charge of 4.5 × 10-5 C is placed in an electric field with a strength of 2.0 × 104 StartFraction N over C EndFraction. If the charge is 0.030 m from the source of the electric field, what is the electric potential energy of the charge?
Answer:
0.027 J
Explanation:
The electric potential energy of the charge is given by:
[tex]U=qEd[/tex]
where:
q is the magnitude of the charge
E is the strength of the electric field
d is the distance of the charge from the source of the field
In this problem, we have:
[tex]q=4.5\cdot 10^{-5}C[/tex] is the charge
[tex]E=2.0\cdot 10^4 V/m[/tex] is the strength of the field
d = 0.030 m is the distance of the charge
So, its electric potential energy is
[tex]U=(4.5\cdot 10^{-5})(2.0\cdot 10^4)(0.030)=0.027 J[/tex]
Answer:
.027 J
Explanation:
If an object force of 50 N is used to move an object a distance of 20 m, what distance must the object be moved if the input force is 10 N, so that work in = work out?
To keep work output equal with a reduced force of 10 N, the object must be moved 100 m, based on the work formula showing that work equals force times distance.
Explanation:To determine the distance an object must be moved with a different force while ensuring that the work input equals the work output, we use the work formula Work = Force × Distance. Initially, a 50 N force moves an object 20 m, so the work done is 50 N × 20 m = 1000 Joules. If the force is reduced to 10 N, to maintain the same amount of work (1000 Joules), the object must be moved a greater distance. We solve for the distance using the work formula, rearranging it to Distance = Work / Force. Thus, the new distance is 1000 Joules / 10 N = 100 m.
The magnitudes of the vertical and horizontal components of a vector are 11 and 17 centimeters respectively. Find the magnitude of the vector and the angle from the horizontal axis.
Explanation:
let the magnitude of the vector be |A|
|A| = ✓11^2 + 17^2 =
|A| =✓410
|A| = 20.23
theta =Tan^-1(11/17) =32.91°
Explanation: edmentum answer
Please need help on this one
Answer:
B) 5
Explanation:
Pedigree charts can be read like family trees, and you can trace a trait through families. Squares usually refer to males, and circles refer to females. Shaded shapes usually refer to the presence of a specific trait, whereas blank shapes are those who do not possess the trait of interest.
The horizontal line between 1 and 2 shows that these individuals have had offspring.
If you follow that vertical line down to the next level, you can see it forms 5 branches - to individuals 3, 5, 7, 8 and 10. Therefore, 1 and 2 had five offspring.
Then, individual 3 had two children with individual 4 (see the horizontal line) - individuals 11 and 12.
Individual 5 had three children with individual 6 - individuals 13, 14, and 15.
Individual 7 did not have any children. Neither did individual 8
Individual 10 had four children with individual 9 - individuals 16, 17, 18 and 19.
A sling is being rotated at the rate of 100 rpm
a) What will the length of the sling have to be so that the speed of the object
at the end will be 40 meters per second? (in meters)
b)
If the sling is 1 meter long, how fast will the object at the end be
traveling? (in meters per second)
How many revolutions will the sling make over one hour?
Answer:
a) [tex]r = 3.820\,m[/tex], b) [tex]v\approx 10.472\,\frac{m}{s}[/tex]
Explanation:
a) The needed length is found by the following formula:
[tex]r = \frac{v}{\omega}[/tex]
[tex]r = \frac{40\,\frac{m}{s} }{(100\,rpm)\cdot(\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )}[/tex]
[tex]r \approx 3.820\,m[/tex]
b) The required speed is:
[tex]v = \omega \cdot r[/tex]
[tex]v = (100\,rpm)\cdot (\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )\cdot(1\,m)[/tex]
[tex]v\approx 10.472\,\frac{m}{s}[/tex]
Final answer:
The sling must be 3.82 meters long for the object at the end to travel at 40 meters per second, while an object at the end of a 1-meter long sling will travel at 10.47 meters per second. Over one hour, the sling makes 6000 revolutions.
Explanation:
Calculating the Length of Sling and Speed of an Object
To calculate the length of the sling so that the speed of the object at the end will be 40 meters per second, we use the relationship between linear speed (v), radius (r), and angular speed (ω). The linear speed is given by the equation v = r ω, where ω must be in radians per second. For 100 rpm, we convert to radians per second:
ω = 100 rev/min × (2π rad/rev) × (1 min/60 s) = 10.47 rad/s
The required radius (or length of the sling) is then: r = v/ω = 40 m/s / 10.47 rad/s = 3.82 meters.
To find out how fast the object at the end of a 1 meter long sling would be traveling, we use the same formula: v = r ω = 1 m × 10.47 rad/s = 10.47 m/s.
Over one hour, the number of revolutions would be 100 rpm × 60 min/hour = 6000 revolutions.
what is the resistance of a conductor
Opposition for the current flow
Explanation:
Resistance is defined as the ability pf the conductor to oppose the flow of electrons through it. It is usually represented in Ohm.Resistance is an important parameter in a circuit design and it should be properly designed.Resistance of a conductor depends upon the material nature, length of the conductor and area of cross section. In conductor, Resistance is low. It is due to that charges flow through the conductor freely.This is may mastering physics homework and I just need help solving the question.
Luc, who is 1.80 m tall and weighs 950 N, is standing at the center of a playground merry-go-round with his arms extended, holding a 4.0 kg dumbbell in each hand. The merry-go-round can be modeled as a 4.0-m-diameter disk with a weight of 1500 N. Luc's body can be modeled as a uniform 40-cm-diameter cylinder with massless arms extending to hands that are 85 cm from his center. The merry-go-round is coasting at a steady 27 rpm when Luc brings his hands in to his chest.
Answer:
Angular speed of the disc after he fold his hands is given as
[tex]\omega_f = 27.5 rpm[/tex]
Explanation:
As we know that the moment of inertia of the solid cylinder is given as
[tex]I_1 = \frac{m_1r_1^2}{2}[/tex]
so we have
[tex]I_1 = \frac{(950/9.81)(0.20)^2}{2}[/tex]
[tex]I_1 = 1.94 kg m^2[/tex]
now moment of inertia of two dumbbell in his hand is given as
[tex]I_2 = 2(m_2 r_2^2)[/tex]
[tex]I_2 = 2(4)(0.85)^2[/tex]
[tex]I_2 = 5.78 kg m^2[/tex]
Now moment of inertia of the disc is given as
[tex]I_3 = \frac{1}{2}MR^2[/tex]
[tex]I_3 = \frac{1}{2}(1500/9.81)(2^2)[/tex]
[tex]I_3 = 305.8 kg m^2[/tex]
Now we can use angular momentum conservation as there is no external torque on it
[tex](I_1 + I_2 + I_3) \omega_i = (I_1 + I_3)\omega_f[/tex]
[tex](1.94 + 5.78 + 305.8) 27 = (1.94 + 305.8) \omega_f[/tex]
[tex]\omega_f = 27.5 rpm[/tex]
Answer: Hello above answerer, Why didn't you add I2 on the other side of the equation?
You just added I1 and I3
Explanation:
explain the difference between speed and vilocity?
Answer:
The short answer is that velocity is the speed with a direction, while speed does not have a direction.
Explanation:
Speed is how fast an object is moving. It is calculated by the displacement of space per a unit of time. Velocity is the rate at which an object changes position in a certain direction. It is calculated by the displacement of space per a unit of time in a certain direction. Velocity deals with direction, while speed does not.
Answer:
velocity is speed with direction
Explanation:
How is chemical symbol of the element determined?
Answer:
As per international agreement.
Explanation:
A chemical symbol is a mode to represent a chemical element. These symbols are named as per international agreements.
WILL GIVE BRAINIEST! Considered together, kinetic and potential energy on a macroscopic scale are known as what
A mechanical energy
B light energy
C internal energy
D thermal energy
Which of the following materials offer the least electrical resistance? Pure water, wood, salt water, glass
Salt water offers the least electrical resistance.
Explanation:
Least electrical resistance indicates that any material which readily allows the electric current through itself, and shows more conductivity.
Here pure water doesn't contain any ions, so it is a bad conductor.
Wood and glass are also bad conductors of electricity.
Salt water contains ions, which conducts electricity which means it shows least electrical resistance.
Answer:
salt water
Explanation:
g of potassium reacts with 16 g of oxygen to produce 94 g of potassium oxide
Answer:
78g
Explanation:
Given parameters:
Mass of oxygen gas = 16g
Mass of potassium oxide = 94g
Unknown:
Mass of reacting potassium = ?
Solution:
To solve this problem, we need to obtain a balanced reaction equation. Then determine the number of moles of the reactant and use it to find that of the other one.
Balanced equation:
4K + O₂ → 2K₂O
Number of moles of reacting oxygen;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
molar mass of O₂ = 2 x 16 = 32g/mole
Number of moles = [tex]\frac{16}{32}[/tex] = 0.5mole
From the reaction equation;
4 mole of K reacted with 1 mole of O₂;
x mole of K will react with 0.5 mole of O₂
Therefore, 4 x 0.5 = 2 moles of potassium.
Mass of potassium = number of moles x molar mass
Molar mass of potassium = 39g
Mass of potassium = 2 x 39 = 78g