Answer:
A
Explanation:
The definition of current is the differential change in charge over a differential change in time. In the case of the wire, a source, say a battery, sends electrons from one terminal to another terminal. The medium through which these electrons move is the wire. Therefore, the charge flowing through the wire over time creates an electric current, by definition.
A warehouse has a pulley system to move stuff. A technician uses the pulley to lift a 500.0 kg box of material from floor to the top shelf, 3.50 m up. The force on the chain is 10 000. N applied through a distance of 4.50 m. What is the efficiency of the pulley?
Answer: 38% efficiency
Explanation:
Given:
- Mass of box, 500.0kg
- Height lifted, 3.50m
- Force Applied, 10 000N
- Distance applied, 4.50m
Required:
% Efficiency, can be found through formula η = [useful energy output (Eout) ÷ energy input (Ein)] x100%
To calculate Eout, you need to find which energy transferred to the box is useful. In this case, it is the gravitional potential energy, which can be found by the formula Eg = mgh, where Eg = (500.0)(9.8)(3.50) = 17150J.
To calculate Ein, find the total energy that was inputted to the object, given by W = FΔd, where W = 45000J.
Now, plug in the values to the %eff formula:
(17150J ÷ 45000J) x100% ≈ 38%
Therefore % efficiency of the pulley is 38%.
a car accelerates from 20 m/s to 40 m/s in 10 s and its forward thrust is equal to 3 kN, what is the mass of
A car that has a forward thrust of 3kN and accelerates from 20 m/s to 40 m/s in 10 s has a mass of 1500 kg. Thus, the mass of the car is the 1500 kg
Newton's 2nd law of motionFrom the question, we are to calculate the mass of the car.
From Newton's second law of motion, we have that
F = ma
Where F is the Net force
m is the mass
and a is the acceleration
Also, from one of the equations of linear motion, we have that
v = u + at
Then, we can write that
[tex]a = \frac{v-u}{t}[/tex]
Where v is the final velocity
u is the initial velocity
a is the acceleration
and t is the time taken
Therefore,
[tex]F = m\frac{(v-u)}{t}[/tex]
From the given information,
u = 20 m/s
v = 40 m/s
t = 10 s
F = 3 kN = 3000 N
Putting the parameters into the equation, we get
[tex]3000 = m \frac{(40-20)}{10}[/tex]
[tex]3000 = m \times \frac{20}{10}[/tex]
3000 = 2m
Then,
m = 3000 ÷ 2
m = 1500 kg
Hence, the mass of the car is the 1500 kg.
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What is the frequency of light that has a wavelength in water of 600 nm if the refractive index for this light is 1.33
The frequency of the light with the given wavelength in water is 3.75 × 10¹⁴ Hz.
Wavelength and FrequencyWavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
Both frequency and wavelength are inversely proportional to each other.
Using the wavelength, frequecy and speed relation;
λ = v / f
Where λ is wavelength, v is speed and f is frequency.
Given the data in the question;
Wavelength in water λw = 600nm = 6.0 × 10⁻⁷mRefraction index u = 1.33Frequency f = ?We know that frquency in water is the same as frequecy in air, it doesnt change due to medium.
From the expression above, the frequency of the light will be;
λ = v / f
f = Vw / λw
But,
Refractive index u = velocity of light in air / velocity of light in medium ( water )
So,
Vw = ( 3×10⁸m/s × 1 ) / 1.33
Vw = 2.25 × 10⁸m/s
Hence,
f = Vw / λw
f = ( 2.25 × 10⁸m/s ) / ( 6.0 × 10⁻⁷m )
f = 3.75 × 10¹⁴ s⁻¹
f = 3.75 × 10¹⁴ Hz
Therefore, the frequency of light that with the given wavelength in water is 3.75 × 10¹⁴ Hz.
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Sample Response: When there is less rainfall, land, which is part of the geosphere, becomes dry. When there is not enough water, plants will not get the nutrients they need from the soil and animals will not get enough water, and they will die. Both plants and animals are part of the biosphere. Less precipitation would also mean less water in lakes and groundwater, parts of the hydrosphere, and less evaporation. The atmosphere may also be affected due to less water vaporWhich ideas did you include in your answer? Check all that apply.
grow alot of plants that's help to make more h2o
Answer:
Which ideas did you include in your answer? Check all that apply.
Droughts can cause the geosphere to be very dry.
Droughts can affect the survival of organisms in the biosphere.
Droughts can affect the amount of water in the hydrosphere.
Droughts can affect the amount of water vapor in the atmosphere.
Explanation:
If the distance to the water level in the well is doubled, is the time until you hear the splash twice what it was before, more than twice, or less than twice?
Echo is a reflection of sound waves. If the distance is increased, we hear the sound in more than twice the former time.
What is echo?The term echo has to do with the reflection of sound waves. We know that when sound waves are reflected, we hear the sound as the echo.
Now, the time that it takes us to hear the echo depends on the distance between the observer and the depth of the well. If the distance is increased, we hear the sound in more than twice the former time.
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The hard outer covering of an animal is a
In what way are nuclear fission and nuclear fusion similar?
A. Both processes involve the decay of nuclei of atoms.
B. Both processes result in formation of one or more new elements.
C. Both processes are currently used to generate electrical energy.
D. Both processes occur naturally inside the core of a star.
A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. About how old is the rock?
Answer:
2.6 billion yrs old
Explanation:
3 = 12 (1/2)^n n=2 half lives
2 * 1.3 bln = 2.6 bln
How long the fundamental frequency and harmonic remain at their peak loudness until they start to disappear is known as ______ and is a feature of ______.
Answer:
The answer is decay; timbre.
Explanation:
How long the fundamental frequency and harmonic remain at their peak loudness until they start to disappear is known as decay and is a feature of timbre.
Which of the following solutions have a concentration of 0.11 g/mL?
Explanation:
Which of the following solutions have a concentration of 0.11 g/mL?
Answer:
22 g of acetic acid in 200 mL of water
Explanation:
22g/200mL = 0.11 g/mL
1. A positively charged object with a charge of +85 nC is being used to balance the downward force of gravity on a 1.8-gram balloon that has a charge of -63 nC. How high above the balloon must the object be held to balance the balloon?
The distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
Force between the charges
The force between the charges is determined by applying Coulomb's law.
F = kq₁q₂/r²
Downward force of gravityThe downward force of gravity of the balloon is given as;
F = mg
When the two forces balances, the distance between the charges is calculated as follows;
[tex]mg = \frac{kq_1q_2}{r^2} \\\\r^2 = \frac{kq_1q_2}{mg} \\\\r = \sqrt{\frac{kq_1q_2}{mg} } \\\\r= \sqrt{\frac{(9\times 10^9)(85 \times 10^{-9})(63\times 10^{-9})}{(1.8 \times 10^{-3} \times 9.8)} } \\\\r = 0.052 \ m\\\\r = 5.2 \ cm[/tex]
Thus, the distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
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How does adding a resistor to an electric circuit affect the current? (1 point)
O The resistor increases the current by increasing the amount of electric charge.
O The resistor decreases the current by decreasing the amount of electric charge.
O The resistor increases the current by transforming light energy or heat into electrical energy
O The resistor decreases the current by transforming electrical energy into different types of energy
Answer:
O The resistor decreases the current by transforming electrical energy into different types of energy
Explanation:
resistors convert elec energy to heat
Answer:
D
-CONNECTIONS
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much love! <33
A pendulum moves back and forth 3 times every 9 seconds
Answer:
See below
Explanation:
Frequency = 3/9 = .3333 hz
period = 1/f = 3 sec
The measured value of mass M in an experiment is M = 0.743 ± 0.005kg. The error in 2M is
When the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.
Percentage error
The percentage error is determined from the ratio of the error in meaurement to actual measurement.
Percentage error = (error / measurement) x 100%
Percentage error = (0.005 / 0.743) x 100%
Percentage error = 0.67%
When the mass becomes 2MNew mass = 2 x 0.743
New mass = 1.486 kg
Error in measurement0.67 = (new error / 1.486) x 100%
0.0067 = new error / 1.486
new error = 0.0067 x 1.486
new error = 0.00995 kg
Thus, when the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.
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An FM radio wave has a frequency of 7.98E+8 Hz. What is the wavelength of this electromagnetic wave?
Answer:
.376 m
Explanation:
c = speed of light = 3 x 10^8 m/s
c = wavelength * freq
3 x 10^8 = 7.98 x 10^8 * f
f = .376 meters
Freud believes that defense mechanisms are reactions people have to protect themselves from uncomfortable feelings. the article ""high on anxiety"" suggests that some people want to feel __________ instead of calm because that’s the feeling they’re used to operating under. a. anxious b. happy c. excited d. angry please select the best answer from the choices provided a b c d
Answer:
A: Anxious
Explanation:
got a 100% of Edge
can you get very smart?
Actually according to physics there should be needed a force to move things but our mind does not produce a force ...Apart from myths ...is seems quite impossible to move a object with ur mind
-Thanks for reading
How is the heat affecting the appearance of the road and the people?
Answer:
It doesn’t it may burn the road a little but nothing much other than that I can think ok
Explanation:
What type of processes break down elements?
Question 11 options:
chemical but not nuclear
both chemical and nuclear
only biological
nuclear but not chemical
Answer:
Both chemical and nuclear
When travelling through a vacuum, which of the following is correct?
Radio waves travel faster than gamma rays
Gamma rays travel faster than radio waves
Both Gamma rays and Radio waves travel at the same speed
Radio waves do not travel through a vacuum
Both Gamma rays and Radio waves travel at the same speed when placed in a vacuum.
What are Electromagnetic waves?This is the type of wave of electric and magnetic fields propagating at the speed of light through empty spaces.
All electromagnetic waves such as Gamma rays and Radio waves travel at the same speed which is why option C was chosen.
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4. The photograph in Figure 2.1 shows multiple images that were created by multiple reflections between two flat mirrorsWhat conclusion can you make about the relative orientation of the mirrors? Explain your answer.
The conclusion you make about the relative orientation of the mirrors is that multiple images are created by multiple reflections between two flat mirrors.
What conclusion can you make about the relative orientation of the mirrors?What are mirrors: The law of reflection helps explain how a mirror is characterized as a reflecting surface.
In conclusion, When two mirrors are parallel to each other, the number of reflecton is infinite.This also depends on your point of view.
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A car of mass 1000kg is at the top of a 10 degree hill as shown. What is its gravitational potential energy relative to the bottom of the hill?.
The gravitational potential energy of the 1000kg car relative to the bottom of the hill is 1666L (J).
Potential energy of the carThe gravitational potential energy of the car relative to the bottom of the hill is calculated as follows;
P.E = mgh
where;
h is the vertical height of the hillm is mass of the carLet the slant height of the hill, = L
h = L sinθ
h = Lsin(10)
h = 0.17L
P.E = mg(0.17L)
P.E = 1000 x 9.8 x 0.17L
P.E = 1666L (J)
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What is responsible for Earth's seasons?
A. The Earth's proximity to the sun
B.The Earth rotating on its axis
C.The Earth revolving around the sun
D.The Sun emitting different intensities of light at different times of year
Answer:
I would say C
Explanation:
seasons are cause by the tilt in the Earths axis of rotation as it revolves around the sun.
This property of matter describes
the relationship of mass to volume?
Density is a physical property that describes the relationship between mass and volume. Density is the amount of matter in a given space, or volume.
The nuclide cobalt-60 has 27 neutrons, 33 protons, and a nuclear mass of 59. 933820 u.
Calculate the mass of the separate nucleons using the following information:
Mass of Proton: 1. 007825 u
Mass of Neutron: 1. 008665 u
1 u = 931. 5 MeV
59. 933820 u
02. 01649 u
O 60. 492184
520. 11 u
From the information provided in the question, the total mass of the nucleons is 60.49218 u.
What are nucleons?The term nucleons refers to both the neutrons and the protons that are found in the nucleus of atoms. We have the following information;
Mass of Proton: 1. 007825 u
Mass of Neutron: 1. 008665 u
Mass of 27 neutrons = 27(1. 008665 u) = 27.233955
Mass of 33 protons = 33(1. 007825 u) = 33.258225
Total mass of nucleons = 27.233955 + 33.258225 = 60.49218 u
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Two light waves, initially emitted in phase, will interfere constructively with maximum amplitude if the path-length difference between them is:
Two light waves will interfere constructively if the path-length difference between them is a whole number.
SUPERPOSITIONThe principle of superposition state that, when two or more waves meet at a point, the resultant displacement at that point is equal to the sum of the displacements of the individual waves at that point.
Interference of waves can either be constructive, or destructive.
The two light waves, initially emitted in phase, will interfere constructively with maximum amplitude if the path-length difference between them is a whole number of wavelenght 1λ, 2λ, 3λ, 4λ etc
The equivalent phase differences between the waves will be 2[tex]\pi[/tex] or 360 degrees, 4[tex]\pi[/tex] or 720 degrees, 6[tex]\pi[/tex] 1080 degrees etc
Therefore, the two light waves, initially emitted in phase, will interfere constructively with maximum amplitude if the path-length difference between them is a whole number.
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50pts Each
In order to differentiate between speed, displacement, and acceleration, a physical science student models the three terms using a toy car. The car is rolled forward 20 meters, turns around, and is rolled back to the starting point (another 20 meters) in 10 seconds.
A) The acceleration occurred when the car changed direction.
B) The speed was forty meters in 10 seconds, or 4 meters per second.
C) The speed was zero, since the object had no overall displacement.
D) The velocity was forty meters in 10 seconds, or 4 meters per second.
E) The velocity was zero, since the object returned to its original location with zero displacement.
Answer:
D
Explanation:
D) The velocity was forty meters in 10 seconds, or 4 meters per second.
Answer the following question in 3-4 complete sentences. a sculpture of a man sitting with his legs crossed, feet facing up. one hand is raised beside the shoulder, palm out. the other is placed on the knee. two smaller figures stand behind the seated man and two smaller figures float above him. name and describe the sculpture above. what school of thought is this sculpture a part of?
Answer:
see explanation
Explanation:
This sculpture is entitled, Buddha and Attendents. It was made of sandstone flecked with cream-colored spots. Buddha's right hand is raised in a gesture meaning "have no fear". This sculpture is from the Mathura school of thought.
sample response 3dge22
Answer:
This sculpture is entitled, Buddha and Attendents. It was made of sandstone flecked with cream-colored spots. Buddha’s right hand is raised in a gesture meaning ”have no fear”. This sculpture is from the Mathura school of thought.
Explanation:
picture
At a depth of 30 m/99 ft, gas molecules in a flexible container will be packed ______ times more closely together than they will be at the surface.
The correct statement will be "At a depth of 30 m/99 ft, gas molecules in a flexible container will be packed four times more closely together than they will be at the surface."
What is a gas molecule?Generally, a gas molecule is simply defined as a combination of numbers of atoms that are connected one to another.
In conclusion, The deeper gas molecules go in a surface the more compact they become
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At a bicycle repair shop, a bicycle tire of mass M and radius R is suspended from a peg on the wall. The moment of inertia of the tire around the peg is 2MR2 . If the tire is displaced from equilibrium and starts swinging back and forth, what will be its frequency of oscillation
The frequency of oscillation given the moment of inertia of the tire around the peg will be f = 1/2π✓(g/2R).
How to calculate the frequency of oscillation?Given I = 2MR²
Torque = Mgsin(theta)R
Here, w = 2πf.
f = 1/2π✓(MgR/I)
f = 1/2π✓(MgR/2MR²)
f = 1/2π(✓g/2R)
Therefore, the frequency of oscillation is f = 1/2π(✓g/2R).
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