Answers
Explanation:
focal length and radius of curvature for a convex mirror is always negative this reason is due to sign convection
Related Questions
Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 450 newtons stretches a spring 30 centimeters. How much work is done in stretching the spring from 50 centimeters to 80 centimeters
Answers
The work done in stretching the spring from 50 cm to 80 cm is 67.5 J.
Hooke's LawHooke's law states that the force applied to an elastic material is directly proportional to its extension, provided its elastic limit is not exceeded.
To calculate the amount of work done by Hooke's law, first, we need to find the force constant of the spring.
Formula:
F = ke................. Equation 1Where:
F = Force appliedk = Spring constante = extensionmake k the subject of the equation
k = F/e................ Equation 2From the question,
Given:
F = 450 Ne = 30 cm = 0.3 mSubstitute these values into equation 2
k = 450/0.3k = 1500 N/m.Finally, To find the work done in stretching the spring from 50 cm to 80 cm, we use the formula below.
W = ke²/2........... Equation 3Where:
W = Work donek = spring constante = extensionAlso, From the question,
Given:
e = (80-50) = 30 cm = 0.3 mk = 1500 N/mSubstitute these values into equation 3
W = 1500(0.3²)/2W = 67.5 J.Hence, The work done in stretching the spring from 50 cm to 80 cm is 67.5 J.
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Why might video games increase creativity while the use of cell phones, the internet, or computers do not?
Answers
Explanation:
Video games are developed around a structure that is unique from your usual media, where there is a sense purpose in mind when playing a game, as decided by the player, and it allows them to explore creative options in order to solve scenarios, depending on the genre. In the use of phones, internet, or computers, this structure is more rare and diverse from video games, which does not lean more toward a creative purpose to build from. That idea gives people the inspiration and discover skills they never knew they even had.
HELP ASAP
If you start at house 10 and follow the vectors shown on the left, which house
will you end up at?
A. House 6
B. House 8
C. House 7
D. House 9
Answers
Would you rather know how you die or know when you die?
Answers
Answer:
I guess how cause then I could posibbly prevent it from happening it or if say I die from a protest and I saw a protest I could just be like well im gonna die today. Hbu?
Explanation:
When the temperature is expected to drop below freezing, a farmer places large tubs of water in an unheated food storage shed. Write two or three sentences explaining why the farmer uses this technique to protect the produce from freezing. Hint: Remember that liquid water has more potential energy than ice.
Answers
The farmer uses this technique to protect the produce from freezing because as the water in the tubs begins to freeze, it releases heat. This heat can help to keep the surrounding air in the shed above freezing, protecting the produce from freezing as well. Additionally, as the water in the tubs freezes, it releases latent heat of fusion, which is the energy required to change a substance from a solid to a liquid. This energy is also released in the form of heat, further helping to keep the produce from freezing.
What can develop when the temperature of the ocean is 80°F. A. Tornado B. Tsunami C. Thunder Storm D. Hurricane
Answers
When the temperature of the ocean is 80°F what is likely to develop is Hurricane. That is option D.
What is Hurricane?Hurricane is a natural disaster that occurs over the tropical large water bodie such as the oceans which is characterized by low-pressure storm.
The factors that can cause the occurrence of hurricane include the following;
Increase in Ocean temperature: waters above 80 degrees Fahrenheit provide energy for a hurricane to form.Water movement: spinning in low-pressure areas of water creates a wave.Low wind shear : low wind shear allows a storm to grow large and strong.Therefore, when the temperature of the ocean is 80°F what is likely to develop is Hurricane.
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Answer: thunderstorm
Explanation:
When the sea surface is at least 80° Fahrenheit (27° Celsius), it can supercharge a thunderstorm. The storm sucks up that heat and water, which make the storm bigger. As it grows, air pressure at the center of the storm continues to drop, which causes the vacuum in the middle to grow stronger.
Help me with this thanks!
Answers
Answer:
a. slope = 1
b. 70
c. y = 1.058x - 3.29 (it says under the graph)
d. about -3.29 or -3.3
hope this helps:)
If a student were to measure the ball's speed at each position above, at which position would
the ball be traveling the fastest?
A
B
C
D
Answers
Answer:
The ball would be traveling fastest at point (C).
Point (D) appears to be the same height as point (C) but the ball would probably have lost some speed on rebounding,
A hungry rabbit sprints... what is the average velocity of the rabbit between the times t = 2 s and t = 12 s
Answers
Answer: -0.10m/s
Explanation:
khan academy
1. What is the difference between longitudinal and transverse waves? Compare and contrast the direction of their movement, movement of a molecule through the completion of a cycle, and amplitude and wavelength measurements of each type of wave.
2. Suppose that a wave has a period of 0.03 second. What’s its frequency? Be sure to show the steps for your work.
3. Compare a wave that has a period of 0.03 second with a second wave that has a period of 1/4 second. Which wave has the greater frequency? Be sure to show the steps for your work.
4. If a wave has wavelength of 4.5 meters and a period of 0.07 second, what’s the velocity of the wave? Be sure to show the steps of your work.
5. Using the image below, identify the numbered parts of the wave.
Answers
Answer:
Explanation:
1. The waves in which the partciles of medium vibrates in the same direction of propagation of wave, are called longitudinal waves.
The waves in which the partciles of medium vibrates in the perpendicular direction of propagation of wave, are called transverse waves.
2. Period, T = 0.03 s
The frequency is given by the reciprocal of the period.
\(f=\frac{1}{T}\\\\f =\frac{1}{0.03}\\\\f = 33.3 Hz\)
1. Transverse waves carry molecules at right angles to the direction in which the wave travels. Within a cycle, molecules move from their normal position to the highest position, back through the normal position to the lowest point, and then back to the normal position. The molecules retain their horizontal positions while vibrating vertically. Amplitude is measured at right angles to the direction of the travel of the wave. Wavelength can be represented as the distance between any two molecules in phase with each other, such as the two nearest molecules at the crests of the wave.
Longitudinal waves carry molecules parallel to the direction in which the wave travels. Within a cycle, a molecule travels in the same direction as the wave (from normal position to its most distant point on one side of its normal position), changes direction, moves back through its normal position to the opposite side of its normal position at a point that corresponds, and then returns to its normal position. The molecules don’t all move at the same time; some remain stationary as others go through a vibrating motion. Compressions and rarefactions occur here. Amplitude is measured parallel to the direction of the wave. Wavelength may be represented as the distance between the two nearest molecules that didn’t vibrate, the two nearest molecules at maximum compression, or the two nearest molecules at maximum rarefaction.
2. f = 1⁄T
f = 1⁄0.03
f = 33. 3 Hz
3. The first wave has a frequency of 33.3 Hz:
f1 = 1⁄T1
f1 = 1⁄0.03
f1 = 33. 3 Hz
The second wave has a frequency of 4 Hz. f2 = 1⁄T2
f2 = 1⁄1⁄4
f2 = 1 ÷ 1⁄4
f2 = 1 × 4⁄1
f2 = 1⁄1 × 4⁄1
f2 = 4 Hz
Therefore, the first wave has a higher frequency.
4. v = I⁄T
v= 4.5⁄0.007
v = 642.9 m/s
5. Wavelength
Crest
Trough
Amplitude
2. What is the mass of an object that was accelerated at a rate of 1 m/s with a force of 2 N
Answers
Answer:
2 kilograms
Explanation:
F = ma
2 = 1m = 2
if i wanted the laser to refract less as it exits the prism, i would
Answers
If you wanted the laser to refract less as it exits the prism, you should increase the wavelength of the light.
What is refraction?Refraction can be defined as a phenomenon which describes a change (bend) in the path taken by light when it's at surfaces between different transparent materials.
According to the model of light wave, the refraction of light is inversely proportional to its wave. Thus, you should increase the wavelength of light, if you want the laser to refract less as it exits the prism.
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Pots A and B both have plain soil, bean seeds, and the same amount of light. Pot B receives more water (see table). After 50 days the plants are measured. Based on the data, what is the correct conclusion?
Answers
The amount of water affects the mass and the height of the plants.
What is the correct conclusion from the data obtained?The correct conclusion is the conclusion which the data obtained supports.
Plants need both water and sunlight to grow.
The variation the amount of water or sunlight that a plant receives will affect the growth rate of the plant.
Based on the data obtained from the experiment where Pots A and B both have plain soil, bean seeds, and the same amount of light, while Pot B receives more water, the amount of water affects the mass and the height of the plants.
In conclusion, plants need both water and sunlight for growth.
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Select the correct answer.
Using the statistical definition of entropy, what is the entropy of a system where W = 4?
Answers
Using the statistical definition of entropy, The entropy of a system W = 4 is 1.91×10²³.
What is entropy?Entropy is typically referred to as a measurement of a system's randomness or disorder. In 1850, a German physicist named Rudolf Clausius first proposed this idea. Entropy is a thermodynamic property used to characterize a system's behavior in terms of temperature, pressure, entropy, and heat capacity. This thermodynamic explanation took the systems' equilibrium condition into account.
Entropy can be calculated using a mathematical expression.
Entropy = Total change of heat / thermodynamic temperature
S= KblnW
S is the statistical entropy
The value of Boltzmann's constant is 1.38×10⁻²³.
S= 1.38×10⁻²³ ln(4)
S = 1.91×10⁻²³
Using the statistical definition of entropy, The entropy of a system W = 4 is 1.91×10²³.
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Answer: C.
1.91 × 10⁻²³ joules/kelvin
Explanation: edmentum
change the following sentence from active to passive my mother gave a book to mohan
Answers
A book was given to Mohan by my mother.
1. A girl drops a ball off the roof of her house. It takes the ball 2 seconds to hit the ground. How tall
is the house?
Answers
If the acceleration constant..
you can use the formula s = ut + 1/2at²
Known that :
s = ?
u = 0
t = 2s
a = 10ms-²
Then you can apply the formula
s = ut + 1/2at²
s = 0 + 1/2(10)(2)²
s = 5 × 4
s = 20m
Answer : 20m
Explanation :
The gravity can be 9,8 or 10. Also im not sure how people teach you but in my school, if the ball goes down the gravity is positive and not negative thats why i put 10ms-² and not -10ms-²
s = displacement/distance
u = initial speed
a = acceleration
t = time
sorry if im wrong
Anyone know how to do this???
Answers
Answer:
World War 1 was caused by entangled alliances, nationalism, imperialism, and major
advancements in military technology. Does the Treaty of Versaille address those issues?
Explain your answer using facts. (5 points)
weather meaning of physics
Answers
Answer:
1. The day-to-day conditions of the atmosphere at a place with respect to elements like humidity, temperature, wind speed, rainfall, etc. is called the weather of that place.
2. Weather can be cloudy, sunny, rainy, stormy or clear. It is a part of the natural phenomenon which maintains the equilibrium in the atmosphere.
3. But conditions can be worse sometimes. When the atmospheric conditions are extreme or intense enough to cause property loss or life loss, such weather is termed as severe weather.
4. These also vary according to the altitudes, latitudes, and region and pressure differences. Tornadoes, cyclones, heavy rainfall, fog, winter storms come under this category. They are disastrous and hazardous. Proper disaster management and strategies are required to handle these conditions.
For an atom's electrons, how many energy sub levels are present in the principal energy level n=4?
A. 4
B. 9
C. 10
D. 16
E. 32
Answers
Answer:
the principal energy level is d because electrons are 2 times more
What is the definition of power?
Answers
Answer:
the capacity to accomplish something or act in a specific way, particularly as a characteristic or faculty
Explanation:
Answer:
Power is the ability to influence or change an outcome. Personal power is a source of influence and authority a person has over his or her followers. ... In short, the power is determined by his or her followers. There are different types of power a person can hold.
Explanation:
OTHER:1 : possession of control, authority, or influence over others. 2 : a nation that has influence among other nations a foreign power. 3 : the ability to act or produce an effect It's in your power to change things. 4 : the right to do something the president's powers.
MORE INFO...What are the 7 types of power?
Legitimate Power. ...
Coercive Power. ...
Expert Power. ...
Informational Power. ...
Power of Reward. ...
Connection Power. ...
Referent Power.
Hope this helps you :))))
a car is moving at 56 miles per hour the kinetic energy of that car is how much energy does that same car have when it moves at
Answers
Complete Question
A car is moving at 56 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 90 miles per hour? Answer in units of J
Answer:
\(K.E_2=640000J\)
Explanation:
From the question we are told that:
Initial Velocity \(v_1=56 mil/h=>25.0342m/s\)
\(K.E_1=5*10^5J\)
Final Velocity \(V_2=90mil/h=>40.2336m/s\)
Generally the equation for Kinetic Energy is mathematically given by
\(K.E=0.5mv^2\)
Therefore
\(K.E_1=0.5mv_1^2\)
\(5*10^5J=m(25.0342)^2\)
\(m=797.82kg\)
Therefore The Final K.E_2 is
\(K.E_2=0.5mv_2^2\)
\(K.E_2=0.5*(797.82kg)(40.2336m/s)^2\)
\(K.E_2=640000J\)
1. A male African elephant can grow up to 14 feet tall and have a mass as large as 7,000 kg. What would
be the weight in Newtons of a male African elephant on the moon?
Answers
The weight of a male African elephant on the moon would be approximately 11,470.2 Newtons.
To calculate the weight of a male African elephant on the moon, we need to use the formula:
Weight = mass × acceleration due to gravity
The mass of the elephant is given as 7,000 kg. However, the acceleration due to gravity on the moon is approximately 1/6th (0.1667) of the acceleration due to gravity on Earth, which is approximately 9.8 m/s².
Weight on the Moon = 7,000 kg × 0.1667 × 9.8 m/s²
Weight on the Moon = 7,000 kg × 1.6386 m/s²
Weight on the Moon ≈ 11,470.2 Newtons
Therefore, the weight of a male African elephant on the moon would be approximately 11,470.2 Newtons.
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Lightning is a very large flow of electrical energy. Describe the type of energy that creates the electrical energy.
A)
B)
C)
D)
The electrical energy comes from the thermal energy stored up in the water molecules.
The electrical energy comes from the gravitational potential energy of the water molecules.
The electrical energy comes from the chemical potential energy of the water molecules in the clouds.
The electrical energy comes from the attraction between charges in the cloud and the ground creating an electric potential.
Eliminate
Answers
The type of energy that creates the electrical energy is Option D) The electrical energy comes from the attraction between charges in the cloud and the ground creating an electric potential.
Lightning is a natural electrical discharge of very high voltage that occurs in the atmosphere. It is a result of the buildup of charges in the atmosphere. The atmosphere contains different types of gases, including water vapor. As warm and cold air masses mix, they create turbulence and water vapor rises, forming clouds. These clouds contain millions of water droplets, ice crystals, and other particles. Within these clouds, there are electrical charges that build up.
The electrical energy in lightning comes from the attraction between the positive and negative charges in the cloud and the ground. When there is a large enough charge separation between the positive and negative charges in the cloud, an electric potential is created. This electric potential can build up to a point where it overcomes the insulating properties of the atmosphere and a lightning bolt is discharged. The lightning bolt is essentially a giant spark of electricity that bridges the gap between the cloud and the ground, creating a flow of electrical energy.
In summary, the electrical energy in lightning is created by the attraction between the positive and negative charges in the cloud and the ground, creating an electric potential that can discharge as a lightning bolt. Therefore, Option D is Correct.
The question was Incomplete, Find the full content below :
Lightning is a very large flow of electrical energy. Describe the type of energy that creates the electrical energy.
A) The electrical energy comes from the thermal energy stored up in the water molecules.
B) The electrical energy comes from the gravitational potential energy of the water molecules.
C) The electrical energy comes from the chemical potential energy of the water molecules in the clouds.
D) The electrical energy comes from the attraction between charges in the cloud and the ground creating an electric potential.
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The half-life of Silver-105 is 3.57 x 106 seconds. A sample contains 5.78 x 1017 nuclei. What is the decay constant for this decay?
Answers
Answer:
The decay constant, or "lambda" (λ), is the rate at which a radioactive isotope decays. It is usually measured in units of inverse time, such as seconds. In this case, the decay constant can be calculated as follows:
16:42
λ = (ln(2)/3.57 x 106) x (5.78 x 1017) = 0.
Explanation:
A carbon ion with 10 electrons and 6 protons would have a charge of ?
Answers
Answer:
-4
Explanation:
Electrons are negative while protons are positive.
To find the charge, add the number of protons to the number of electrons.
6+(-10)
6-10
-4 is the charge
A object has a mass of 4 kg and is accelerating at 3 m/s2.The net force acting on the object is [] N.
Answers
In order to calculate the net force acting on the object, we can use the second law of Newton:
\(\sum ^{}_{}F=m\cdot a\)So, for a mass of 4 kg and an acceleration of 3 m/s², we have:
\(\begin{gathered} F=4\cdot3 \\ F=12\text{ N} \end{gathered}\)Therefore the net force is 12 Newtons.
The mass of the basketball shown below is 4 times the mass of the baseball.
Basketball
Baseball
If the two balls are moving at the same speed, and the basketball and the baseball has a kinetic
energy of 10.0 J, what is the kinetic energy of the basketball?
2.5 J
5.03
10.03
20.0 J
Answers
Answer:
40.0 Joules. None of the answers is correctExplanation:
Kinetic energy of an object is expressed as;
KE = 1/2mv² where;
m is the mass of the object
V is the velocity of the object.
Let Ma be the mass of the basketball and Mb be the mass of baseball.
If the mass of the basketball shown below is 4 times the mass of the baseball, then Ma = 4Mb
KE of the basket ball = 1/2MaVa²
Va² = 2(KE)a/Ma ...... 1
KE of the baseball = 1/2MbVb²
Vb² = 2(KE)b/Mb .......... 2
Since their velocities are the same, hence Va²= Vb²
2(KE)a/Ma = 2(KE)b/Mb
Substituting Ma = 4Mb into the resulting expression.
2(KE)a/4Mb = 2(KE)b/Mb
2(KE)a/4 = 2(KE)b
Given Kinetic energy of baseball (KE)b = 10.0J, the expression becomes;
2(KE)a/4 = 2(10)
2(KE)a = 4*20
2(KE)a = 80
(KE)a = 80/2
(KE)a = 40.0J
Hence the kinetic energy of the basketball is 40.0Joules
Which is not part of a DC motor?
Answers
Answer:
The correct answer to the question will be compass i.e compass is not a part of a DC motor. Various parts of a DC motor are coil of wire, armature, field magnets, brushes and commutator. The coil of wire plays a vital role in DC motor.
Explanation:
An object of mass m is moving on a horizontal rough surface. At a certain point it has a speed v m/s and it comes to a stop after traveling 32 m. If the coefficient of friction between the object and the surface is 0.40, what is the value of speed v? Use g= 10 m/s?.
Answers
The speed of the object v is 16 m/s.
The mass of the object moving on the horizontal surface is m.
The speed of the object is v m/s.
The coefficient of friction, μ = 0.40
The acceleration due to gravity, g = 10 m/s²
So, the initial velocity is v m/s and the final velocity is 0 m/s.
The total distance traveled by the object is 32 meters.
The formula for force is:
F = ma
Now,
ma = - μmg
a = - μg
a = - 0.40 × 10 = - 4 m/s²
The distance, s = 32 meters
Using the equation of motion,
v² = u² + 2as
0 = v² + 2( - 4 )( 32 )
0 = u² - 256
u² = 256
u = √256 = 16 m/s
Hence, the value of the speed v is 16 m/s.
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Using the Left Hand Rule, if motion is away from you and the current is left, which way is the field?
A. Down
B. Left
C. Up
D. Right
Answers
Explanation:
To apply the Left Hand Rule, point your left thumb in the direction of the current and your left fingers in the direction of the motion. The direction in which your left palm faces is the direction of the magnetic field. In this case, if the motion is away from you (i.e., in the direction of your eyes), and the current is left, then the magnetic field will be directed upwards.