The worker in the picture is
a.) letting the pulley do all the work
b.) not doing work because he is using a pulley
c.) doing work because he is moving the bale of cotton
d.) transforming mechanical energy to potential energy
Answers
Answer:
the worker is doing work because he is moving the bale of cotton
Related Questions
7. A rocket has a weight of 30,000 N on earth. a) What is the mass of the rocket in outer space? Use appropriate calculations and arguments to support your answer.
b) Calculate the weight of the rocket on planet X (g=7.5 N/Kg)
c) What is the weight of the rocket in outer space? Provide reasons to support your answer
Answers
Explanation:
a) mass=3000kg
b) weight on planet x=3000 × 7.5
=22,500N
c) Weight in outer space will be equal to zero
since the gravity in outer space is negligible
what is the kinetic energy of the ball at position A
Answers
Answer:
Zero j
Explanation:
If the ball is not moving at A, it has zero K.E.
1. Dylan claims that the vase would achieve a higher height if it were launched at a 45-degree angle. Is
Dylan correct?
A. Dylan is correct because a 45-degree launch angle results in the largest vertical range.
B. Dylan is correct because larger launch angles result in a smaller vertical range.
C. Dylan is incorrect because a 90-degree and 45-degree larr
tin the same vertical
range.
D. Dylan is incorrect because a 90-degree launch angle resuh
vertical range
Answers
B
Explanation:
That seems like the best bet
Which condition is necessary for a lunar eclipse to occur?.
Answers
For a lunar eclipse to occur, the Sun, Earth, and Moon must be roughly aligned in a line. Otherwise, the Earth cannot cast a shadow on the Moon's surface and an eclipse cannot take place. When the Sun, Earth, and Moon come together in a straight line, a total lunar eclipse takes
What is the overall energy transformation in a coal-fired power plant?.
Answers
Answer: thermal energy, mechanical energy and, finally, electrical energy.
Explanation:
As a type of thermal power station, a coal-fired power station converts chemical energy stored in coal successively into thermal energy, mechanical energy and, finally, electrical energy. The coal is usually pulverized and then burned in a pulverized coal-fired boiler.
How did the development of electrical signals sent through wires change communication?
A. The electrical signals were more accurate than optical semaphore signals.
B. Signals were amplified with distance.
C. Signals could be sent anywhere a wire could reach and no longer were restricted to line of sight.
D. Signals no longer attenuated with distance.
Answers
A
Explanation:
The electrical signals were more accurate than optical semaphore signals.
The development of electrical signals sent through wires change communication as signals could be sent anywhere a wire could reach and no longer were restricted to line of sight.
What is wire communication?Wired communication refers to the transmission of data over a wire-based communication technology.
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Question 3 of 20
A crate falling from a plane is part of a closed system that has 24450 J of
mechanical energy. If the kinetic energy of the crate increases from 10,000 J
to 15,000 J, what happens to the gravitational potential energy of the system?
A. It decreases from 15,000 J to
10,000 J.
B. It increases from 9450 J to
14,450 J.
C. It decreases from 14,450 J to
9,450 J.
O D. It increases from 10,000 J to
15,000 J.
Answers
Old potential energy:-
PE+KE=MEPE=ME-KEPE=24450-10000PE=14450JNew potential energy
PE=24450-15000PE=9450JOption B is correct
Do you think there could be another period of time when so many brilliant discoveries are made in such a span of time? Why or Why not?
Answers
There won't be another period where many brilliant discoveries are made in such a span of time because of the high degree of advancement already.
What is Technology?Tgis is defined as the application of scientific knowledge for practical purposes.
We have advanced technological advancement which is why there won't be many discoveries in such time span.
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Hello people ~
Quantisation of charge implies _____
(a) charge cannot be destroyed
(b) charge exists on particles
(c) there is a minimum permissible charge on a particle
(d) charge, which is a fraction of a coulomb is not possible.
Answers
(d) charge, which is a fraction of a coulomb is not possible.
Explanation:
Quantisation implies that the charge, which is a fraction of a coulomb is not possible.
charge which is less than that on electron is not possible.everything has a charge (electrons)Basic minimum charge = 1.6 x 10⁻¹⁹
Answer:
Option D
Explanation:
Let's see
According to quantization of charge property
Q=ne wher n is a integerSo
it means that charge should be integer always like 5e,-7e ,3C etc.
But
frcation of coulomb denotes to rational number i e set Q hence its not possible
Answer 1-10 for branly all steps
Answers
The acceleration, a of the bodies given is the change in velocity with time and is given as follows:
a = 1.2 m/sa = 25 km/hra = 35.3 cm/mina = 7.125 km/mina = 1.69 m/sa = 108.1 m/hra = -1.0 cm/sa = 7.89 km/hra = 1.17 ft/sa = 3.13 km/hrWhat is acceleration?Acceleration is the rate of changeof velocity of an object with time.
Acceleration, a = change in velocity/time takenFor the given questions, the acceleration are as follow:
a = (40 - 10)/25 = 1.2 m/sa = (75 - 30)/1.8 = 25 km/hra = (90 - 60)/0.85 = 35.3 cm/mina = (77 - 20)/8 = 7.125 km/mina = (37 - 15)/13 = 1.69 m/sa = (40 - 0)/0.37 = 108.1 m/hra = (13 - 25)/12 = -1.0 cm/sa = (48 - 18)/3.8 = 7.89 km/hra = (52 - 38)/12 = 1.17 ft/sa = (43 - 17)/8.3 = 3.13 km/hrTherefore, the acceleration of a body is either positive or negative.
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15. What drives the motions of the Earth's
atmosphere system?
A energy from the sun
B surface currents
C weather
D Earth's rotation
Answers
We know, air moves from an area of low density to an area of high density. Now since that’s the logic the answer to your questions is:
It is definitely D
Reason for choosing D: Our earth is slanted so not all the solar energy coming from the sun is equal in all place so some tends to get warmer in comparison like equator and have less density so the wind of higher density travel to lower density and that’s what drives the motion of the earths atmospheric system
Which is a situation where two hockey pucks could have equal but opposite momentums? Assume that the ice is a frictionless surface.
A. if the hockey pucks weigh the same.
B. if the hockey pucks exert the same force on each other in the same direction while traveling at the same speed.
C. if the hockey pucks are traveling at the same speed, bounce off each other, and move in the opposite direction.
D. if the hockey pucks have the same mass.
Answers
it has to be C, assuming their masses are the same. As the momentum would be equally distributed as momentum must be conserved( because none is lost to friction on the ice).
The main difference between a radio wave and a light wave is its:.
Answers
Answer:
Speed.
Their speeds are different; Have you ever heard the metaphor the speed of light? For this case, we must turn that into a reality. So, people refer to light speed as the fastest travelling thing in the world, and that is right, unless there is a thing faster than light that was never classified. Unlikely the case. The speed of sound through air travels a lot slower than light. Look at the diagrams below to see what I mean by that.
• • •
As shown in the diagrams, sound speed is WAY slower than light speed!
Systems in the body interact to carry out life functions. The muscles of the body are part of the musculoskeletal system. Which system provides the impulses that cause the muscles to contract?
A.
circulatory
B.
integumentary
C.
respiratory
D.
nervous
Answers
Superkid, finally fed up with Superbully's obnoxious behaviour, hurls a 1.35 kg stone at him at 0.501 of the speed of light. How much kinetic energy do Superkid's super arm muscles give the stone
Answers
Answer:
See below
Explanation:
A lot !
KE = 1/2 m v^2
= 1/2 * 1.35 * ( .501 * 3 * 10^8)^2 =
1.5248 x 10^16 j
kinetic energy do Superkid's super arm muscles give the stone is 62.6 × 10⁶ J.
What is kinetic energy ?Kinetic energy is the energy associated with a motion of a body. When a body is in motion having mass m then it has kinetic energy. Kinetic energy is denoted by K or T. it is expressed in joules. Kinetic energy is given by,
K = 1/2 mv²
Hence an object having zero mass or zero velocity have zero kinetic energy.
In this problem the stone is moving with velocity which is comparable with the speed of light, hence we have to find relativistic kinetic energy.
The relativistic kinetic energy is given by,
[tex]K = m_{0} c^2(\frac{1}{\sqrt{1-\frac{v^2}{c^2}} } -1)[/tex]
putting all the values in the equation
[tex]K = 1.35*3*10^8(\frac{1}{\sqrt{1-\frac{(0.5c)^2}{c^2} } }-1 )[/tex]
K = 62.6 × 10⁶ J
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A monochromatic light passes through a narrow slit and forms a diffraction pattern on a screen behind the slit. As the slit width increases, the diffraction pattern:.
Answers
As the slit width increases, the diffraction pattern gets narrower and vice versa.
Relationship between width and diffraction patternThe increase in silt width leads to the narrowing of diffraction pattern of the light because the increase of width reduces the space for the passing of light wave.
So we can conclude that as the slit width increases, the diffraction pattern gets narrower and vice versa.
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Which of the following is an example if harmonic motion?
Answers
Answer:
"A pendulum swinging back and forth" is an example of harmonic motion
X = Xo cos ω t
Explains the back and forth motion of the pendulum
You push a 25.0kg wooden box across a wooden floor at a constant speed of 1.0m/s . the coefficient of kinetic friction is 0.20 . how large is the force that you exert on the box?
Answers
For a 25.0kg wooden box across a wooden floor at a constant speed of 1.0m/s, The force is mathematically given as
F=49N
What is the force that you exert on the box?Generally, the equation for the Force is mathematically given as
F=uN
Therefore
F=25*9.8*0.20
F=49N
In conclusion, the force is
F=49N
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I. Briefly answer the following questions.
1. Do renewable energy sources have little or no impact compared to
non- renewable resources? Why?
2. Discuss two human activities that endanger renewable resources.
Answers
A step-up transformer increases the voltage 20 timesIf the voltage of the primary coil is 100V_{i} what is the voltage of the secondary coll? Answer only a number without units or commas
Answers
Answer:
2000
Explanation:
well it is just 20 * 100 = 2000 v
if a Bob at rest explodes into two pieces? explain
Answers
Answer:
the pieces must travel in opposite directions.
Explanation:
If a bomb at rest explodes into two pieces, the pieces must travel in opposite directions. Explain A bomb at rest explodes into two pieces. Let the mass of bomb be M and mass of two pieces be m1 respectively. Now, according to conservation of momentum: are velocities of two masses after explosion.
An inductor produces a back emf in a dc series rl circuit when a switch connecting the battery to the circuit is closed. We can explain this by.
Answers
Hi there!
Let's say that a series RL circuit is constructed, with the switch left open.
When the switch is closed, a current will start flowing in the circuit. The INCREASING current will go through the loops of the inductor, producing an INCREASING magnetic field and consequentially a magnetic flux through the inductor. (Use hand rules).
However, the inductor does NOT want to experience this increasing magnetic flux, so an emf in the OPPOSITE direction of the current will be produced to counteract the increasing flux. (The flux would also be in the opposite direction).
This is expressed with the equation:
[tex]\epsilon = -L \frac{di}{dt}[/tex]
ε = Back emf (V)
L = Inductance (H)
i = Current (A)
t = time (s)
With the negative sign, we can see that if the current of the circuit is INCREASING, the emf produced would be in the opposite direction.
Individuals suffering from somatoform disorders often see several doctors about their symptoms because __________. a. doctors often refer their patients for a second opinion b. their symptoms often fall under several specialties c. doctors get frustrated with them and refuse to treat them d. they are looking to find a doctor to give them a diagnosis please select the best answer from the choices provided a b c d
Answers
Individuals suffering from somatoform disorders often see several doctors about their symptoms because doctors often refer their patients for a second opinion
What is doctors opinion?Doctors usually ask people to take different medications to be able to treat the cause and the symptoms of a disease.
For example, they might prescribe antibiotics to treat the infection and anti-inflammatory medication for the swelling and pain.
According to this, the statement that says that doctors often advise a combination of treatments to eradicate an infection and treat symptoms is true.
Hence Individuals suffering from somatoform disorders often see several doctors about their symptoms because doctors often refer their patients for a second opinion
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Answer:
D - they are looking to find a doctor to give them a diagnosis
Explanation:
just took the test
You are taking measurements of sound waves. Every ¼ second, the sound waves pass your detector. What is the wave’s frequency and what is the wave’s period? (Use correct units)
Answers
Answer:
hope this helps, you can ask any questions for clarification
Sometimes, supplies can be delivered to people in remote areas by dropping them off from a plane. This is usually the case for ground troops working in areas where planes are unable to land safely. Parachutes are attached to boxes to prevent damage to items when they land. Compare the parachute setups in the image; A has three parachutes attached, B has one parachute attached, and C has two parachutes attached. If every parachute in all three setups are the same size, and each setup was attached to a 50-pound box, which lists the order the boxes would land from slowest to quickest?
A) A, B, C
B) B, C, A
C) А,С, В
D) В, А, С
Answers
The order the boxes would land from slowest to quickest is A,C,B which is option C.
What is a Parachute?This is a device used to slow the motion of an object through an atmosphere by creating drag.
The size of the parachute affects the speed of falling because a larger parachute allows it to displace more air, causing it to fall more slowly. The one with three parachutes which is A will fall slowest and the one with just one will fall fastest.
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TIGER
1. What is the name of the process taking place in the diagram? Describe the process.
sents a
у
2. What is an ion?
Charged particle that has greater or fewer electrons than protons.
3. What is the solute in the diagram? Is the solute an electrolyte or a nonelectrolyte?
am
of three...
4. Will the solution conduct electricity? Explain.
Answers
Answer:
1) Ionization takes place as the Hydrochloric acid, a strong acid, ionizes completely in water to form the hydronium and chlorine (Cl−) ions
3) Water -- non electrolyte
4) it can conduct electricity because it forms ions
I hope my answer helps you.
Question 4
20 pts
A student connects a length of unknown
material in series with a battery and an
ammeter (which measures current flow).
When the circuit is complete, the ammeter
reads that no current is flowing.
The unknown material is most likely –
Insulator
Semiconductor
Superconductor
Conductor
Answers
If current did not flow in the circuit, it simply implies that the material is an insulator.
What is an insulator?An insulator is a material that does not conduct electricity. A circuit is a path that is provided for the flow of current.
If this material was connected into a complete circuit yet current did not flow in the circuit, it simply implies that the material is an insulator.
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Magnetism is due to the movement of ______.
Answers
Answer:
electrons
Explanation:
Brainliest
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
Magnetism is due to the movement of charge
Both magnetic fields are caused due to attraction and repulsion of charges, where electric fields is caused by stationary charges, while magnetic fields are caused by moving charges
Infrared light is invisible because it has a wavelength that is ____________________ than the human eye can perceive.
Answers
Answer:
700 nanometer to one millimeter
There are ___ particles that make up an atom which are the smallest unit of an ___.
Answers
Answer:
subatomic, element
Explanation:
Subatomic particles are protons, neutrons, and electrons. Atoms are the smallest unit of an element.