Answer:
The answer is A because it is a resource that takes many many years to make more of and we cannot make it ourselves
4. A 3 kg book sits on a 2 m high shelf. How much kinetic and potential
energy does the book have
Answer:
Kinetic energy = 0 and Potential Energy = 29.4J
Of the three sciences, physics, chemistry, and biology, the most complex is
A. physics because it involves many mathematical equations.
B. chemistry because there are so many possible combinations of atoms.
C. biology because it is based upon both the laws of chemistry and physics.
D. All three of these sciences are equally complex.
Answer:
I would probably say C to be completely honest
Explanation:
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A horizontal pipe of inner diameter 2.2 cm carries water with a density of 1000.0 kg/m3 flowing at a rate of 1.5 kg/s. If the pipe widens to 2.5 cm, what is the speed of the water in the wider part
The speed of the water in the wider part will be 1.194 m/sec. Speed is a time-based quantity. Its SI unit is m/sec.
What is speed?Speed is defined as the rate of change of the distance or the height attained.
The given data in the problem is;
The initial diameter is,[tex]\rm d_1 = 2.2 \ cm[/tex]
initial radius,
[tex]r_1 = \frac{d_1}{2} \\\\ r_1 = \frac{2.2}{2} \\\\ r_1 = 1.1\ cm[/tex]
The initial crossection area;
[tex]\rm A_1 = \pi r_1^2 \\\\ \rm A_1 = 3.14 \times (1.1\times 10^{-2})^2 \\\\ \rm A_1 =3.8 \times 10^{-4} \ m^2[/tex]
The final crossection area;
[tex]\rm A_2 = \pi r_2^2 \\\\ \rm A_2 = 3.14 \times ( 2 \times 10^{-2})^2 \\\\ \rm A_2 = 12.56 \ m^2[/tex]
The initial flow rate is;
R = density ×velocity ×area
[tex]\rm R = \rho A V \\\\ 1.5 = 1000 \times V_1 \times 3.8 \times 10^{-4} \\\\ V_1 = 3.947 \ m/sec[/tex]
The speed of the water in the wider part will be;
From the continuity equation;
[tex]\rm A_1 V_1 = A_2V_2 \\\\\ 3.8 \times 10^{-4} \times 3.947 = 12.56 \times 10^{-4} \times V_2 \\\\ V_2= 1.194 \ m/sec[/tex]
Hence, the speed of the water in the wider part will be 1.194 m/sec.
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Given that the Sun's effective temperature is 5700K with its radius of 696,340 km. How many hydrogens convert to helium in a second if all the energy of the sun is coming from the hydrogen to helium fusion process
The number of hydrogens converts to helium in a second will be 3. If all the energy of the sun is coming from the hydrogen to helium fusion process.
What is helium fusion process?When the temperature in the core hits around 100 million degrees, the helium will begin to fuse into carbon in a mechanism known as the triple-alpha process
The given data in the problem is;
The Sun's effective temperature is,T= 5700K
The radius IS,R=696,340 km.
The energy emitted is found is;
[tex]\rm E = 4 \pi \sigma R^2T^4 \\\\ \rm E = 4 \times 3.14 \times 5.67 \times 10^{-8} \times (6.9634 \times 10^8)^2 \times (5700)^4 \\\\ E= 36451449876.6 \times10^{16} \ Joule \\\\ E = 3.65 \times 10^{26} \ J[/tex]
If 26.7 MeV energy is required in hydrogen to helium fusion process;
[tex]\rm 26.7 \ MeV = 4 \ hydrogen \\\\ 26.7 \times 10^6 \times 1.6 \times 10^{19} = 4 \ hydroge n \\\\ 3.65 \times 10^{26} = \frac{4 \times 3.65 \times 10^{26} }{26.7 \times 1.6 \time 10^{-13}}[/tex]
[tex]\rm n = 0.34 \times 10^{39} \\\\ n= 3.4 \times 10^{38} \ hydrogen[/tex]
Hence, hydrogens convert to helium in a second will be 3.4 ×10³⁶.
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Which property will eventually be the same for two objects after thermal
energy is transferred between them?
O A. Internal energy
O B. Pressure
O C. Temperature
O D. Density
Answer: temperature
Explanation: i took the quizz
Which substance does not produce carbon dioxide when reacted with acid?
Answer:
It is lime. Basically, the lime is kinda too weak for it to produce. Thats what I remember my teacher saying. Hope this helps!
Explanation:
a 1200 kg car travels at 20 m/s. what is the momentum
Answer:
24000
Explanation:
Which study led to the conclusion that atoms are not indivisible ?
Answer:
don't know
Explanation:
don't know cause i don't read physic
Answer:
Study of static electricity and the condition under which electricity is conducted by different substances.
The workdone In pulling a body which weighs 30N along a horizontal plane by a constant force of 20N is 320J. Find the distance moved
Answer: The answer is 800 J
Explanation:
Rank the five terrestrial worlds in order of size from smallest to largest: Group of answer choices Mercury, Venus, Earth, Moon, Mars. Mercury, Moon, Venus, Earth, Mars. Moon, Mercury, Venus, Earth, Mars. Moon, Mercury, Mars, Venus, Earth. Mercury, Moon, Mars, Earth, Venus.
Answer: Moon, Mercury, Mars, Venus, Earth
Explanation:
Who was known for being a pilot and an astronaut that walked on the moon?.
Answer:
Neil Armstrong was the astronaut
Which event is part of a covection current in the air?
Answer:
As you must know, Convection Current is the transfer of heat by actual movement of molecules from a hot to cold place due to difference in densities. Thus, the phenomenon of convection current is also observed in nature, for example the Land and Sea Breezes help in keeping the temperature moderate in coastal areas. Convection current in air also helps the birds and gliders to stay in air for a long period.
hope that helps...
According to our theory of solar system formation, why do we find some exceptions to the general rules and patterns of the planets?.
What term refers to alternating waves of contraction and relaxation of the digestive tract that propel food along the tract?.
A 1500 kg car travels at 25 m/s and then quickly stops in 3.5 s to avoid an obstacle. What is the Initial Momentum of the car'
Answer:
3750 kg m/s
Explanation:
momentum = mv = 1500 * 2.5 = 3750 kg m/s
Use the drop-down menu to answer the question. a student is going to produce static charge in a glass rod by rubbing it with a piece of silk. which method of transferring charge does this image illustrate?
Answer:
The second answer is friction. In other words the second answer.
Explanation:
The correct answer to the question is Friction. Friction is responsible to produce a static charge in a glass rod by rubbing it with a piece of silk.
What is friction?Before answering this question, first we have to understand the process of charging a body by friction.
There are generally three modes of charging a body which are known as friction, induction and conduction respectively.
Friction: Friction is the mode of charging a body by direct contact through rubbing with another substance.
In this process, a low electron affinity substance is rubbed with a high electron affinity substance. The low electron affinity substance will lose electron, and acquires positive charge.
On the other hand, the high electron affinity substance will gain electrons, and gets negatively charged .
Hence, there is actual transfer of electrons from one body to another body in the process of charging a body through friction.
As per the question, the glass rod is rubbed with silk. Due this rubbing,static electricity will be developed on the glass rod and silk.
Hence, it is obvious that the glass rod gains static charge due to the process of friction.
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A man lifts a 120 kg barbell 2 m above the ground . What is the gain in gravitational PE of the barbell?
Answer:
2,352 Joules
Explanation:
At the ground, the barbell has a classical mechanical energy value of zero. There is no classical kinetic or potential energy for the barbell. The moment the man starts to lift the barbell, he does work on the barbell and transfers kinetic energy to it due to the motion. At its maximum height where the man lifts the barbell to a stop, the kinetic energy is zero because it transformed into gravitational potential energy stored in the gravitational field. Our reference point for potential was defined to be zero at the floor, therefore we can say that the gravitational potential energy at 2 meters is:
[tex]U=mgh=(120kg)(9.8m/s^2)(2m)=2,352J[/tex]
A car travels 120 km in the first 2 hours and 100 km in the next 2 hours.
What is the car’s average speed?
240 km/h
440 km/h
55 km/h
128 km/h
How long does it take a radio signal from Earth to reach the Moon, which has an orbital radius of approximately 3.8410 m
Answer:
2.4 to 2.7 seconds
Radio waves propagate in vacuum at the speed of light c, exactly 299,792,458 m/s. Propagation time to the Moon and back ranges from 2.4 to 2.7 seconds, with an average of 2.56 seconds (the average distance from Earth to the Moon is 384,400 km).
Explanation:
no explanation.
A point charge of 5.7 µc moves at 4.5 × 105 m/s in a magnetic field that has a field strength of 3.2 mt, as shown in the diagram. a field of circles labeled b. there is a positively charged particle with a velocity vector pointing 37 degrees north of east labeled v. what is the magnitude of the magnetic force acting on the charge? 6.6 × 10–3 n 4.9 × 10–3 n 4.9 × 103 n 6.6 × 103 n
The magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N
What is magnetic force?Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion.The magnitude of the magnetic force acting on the charge is given by:
[tex]\rm F=qvBsin\theta[/tex]
where
The magnitude of the charge [tex]q=5.7\ \mu C =5.7\times 10^{-6} \ C[/tex]
The velocity of the charge [tex]v=4.5\times 10^5\ \frac{m}{s}[/tex]
The magnitude of the magnetic field [tex]3.2\ mT=0.0032\ T[/tex]
The angle between the directions of v and B [tex]\theta =90^o-37^o=53^o[/tex]
By substituting the values we will get:
[tex]F=(5.7\times 10^}-6})(4.5\times 10^5)(0.0032)(Sin53^o)[/tex]
[tex]F=6.6\times 10^{-3}\ N[/tex]
Hence the magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N
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Answer:
a - on edge
Explanation:
yes
NEEDED ASAP
Many car insurance companies consider drivers under the age of 25 __ for vehicle-related collisions.
A. a lower-than-average risk
B. a higher-than-average risk
C. an average risk
Answer:
B
Explanation:
Inexperienced drivers are higher risk
Answer:b
Explanation:a higher-than-average risk
20 points
Which of the following is true about the potential energy between charged particles. Choose the two that apply.
a
Potential energy increases as like charges get closer.
b
Potential energy increases as opposite charges get closer.
c
Potential energy remains the same between like charges as they move apart.
d
Potential energy increases as any charges move closer together.
e
Potential energy decreases as opposite charges get closer.
f
Potential energy decreases as like charges get closer together.
Answer:
(a) and (b)
Both will follow the rule
This is due to property of charges.
As in case of gravitational potential energy as it increases as height increases.
In case of electrical potential energy it will increase as charges comes close.
Explanation:
have a good day:))
Answer:
i beleive its A and B will both follow the rule
This is due to property of charges.
hope this helped
Explanation:
An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude f of the force exerted on the person by the elevator floor compare with the magnitude mg of the gravitational force?.
The force f of the elevator on the man keeps reducing as the elevator keeps going up while the gravitational force mg keeps increasing moving upwards.
What is an elevator?An elevator is an electrical device that lifts people up and down a tall building or structure.
for the elevator to go up, f > mg.
for the elevator to come down mg > f.
Analysis
since the force on the man is f = ma
where a is the acceleration of the elevator, then it means when a increases, f will increase and when it decreases, f would decrease. slowing down means a, is decreasing going up and this reduces the force as the elevator keeps going up.
on the other hand, gravity acts faster on bodies that are slower in motion so since g, increases going up, mg would also increase.
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In an electromagnetic wave in free space, the electric and magnetic fields are.
Answer:
PERPENDICULAR
Explanation:
HOPE IT HELPSPls help first person to answer correct become brainliest
Answer:
See image below
Explanation:
See image
The two pulses reflect off the boundaries of the string, and at some later time, they pass through the middle of the string and interfere. Below are six different sequences of snapshots taken as the two pulses meet in the middle of the string. Time increases from top to bottom in each sequence. Which sequence correctly represents the displacement of the string as the pulses interfere?.
Option C is the sequence which correctly represents the displacement of the string as the pulses interfere.
What is Interference?This is defined as a phenomenon that occurs when two waves meet while traveling along the same medium.
When a wave pulse encounters a free end then it reflects the same way as incident path which is depicted in option C.
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What must have been the velocity of a 250 kg car that has 18000 J of energy?
Answer:
12 m/s
Explanation:
Given,
Kinetic energy ( K.E ) = 18000 J
Mass ( m ) = 250 kg
To find : Velocity ( v )
Formula : -
K.E = mv²/2
v² = 2 K.E / m
= 2 x 18000 / 250
= 2 x 72
= 144
= 12 x 12
v² = 12²
v = 12 m/s
Therefore,
the velocity of the car is 12 m/s
students in a lab are doing experiments involving the motion of objects. they pull an object across a table and use a detector to measure the acceleration of the object for the entire time they pull it. The graph shows the data from the detector, with four segments labeled
The segment of the motion that net force act on the object causing a positive acceleration is segment 1.
Motion of an objectThe motion of an object occurs when a net force greater than zero acts on the object.
The force on the object is determined from Newton's second law of motion.
F(net) = ma
where;
m is mass of the objecta is acceleration of the objectAcceleration of the object from the graphSegment 1: the acceleration is positiveSegment 2: the acceleration is zeroSegment 3: the acceleration is negativeSegment 4: the acceleration is zeroThus, the segment of the motion that net force act on the object causing a positive acceleration is segment 1.
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Write a hypothesis about how the number of half-lives affects the number of radioactive atoms. use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "how does the number of radioactive atoms change over time?"
Answer:
If the number of half-lives increases, then the number of radioactive atoms decreases, because about half of the atoms'nuclei decay with each half life.
1. Write the advantages and disadvantages of connecting lamps (a) in series and (b) in parallel. A3 2. a) 0.2A Draw Fig 5.30 into your exercise book and name the way in which the lamps are connected and answer questions b and c A₂ b) If A3 read 0.2A, what do the other two ammeters read? A1 c) If one of the lamps is removed explain what would happen to the other lamp. Fig 5.30 Reading of ammeter in series circuit
Answer:
parallel connection:Advandages: 1. Every unit that is connected in a parallel circuit gets equal amount of voltage.2. It becomes easy to connect or disconnect a new element without affecting the working of other elements.3. If any fault happened to the circuit, then also the current is able to pass through the circuit through different paths.Disadvantages: 1. It requires the use of lot of wires.2. We cannot increase or multiply the voltage in a parallel circuit.3. Parallel connection fails at the time when it is required to pass exactly same amount of current through the units.series connection:Advantages: 1. Series circuits do not overheat easily. This makes them very useful in the case of something that might be around a potentially flammable source, like dry plants or cloth.2. Series circuits are easy to learn and to make. Their simple design is easy to understand, and this means that it’s simple to conduct repairs .3. we can add more power devices, they have a higher output in terms of voltage .4. The current that flows in a series circuit has to flow through every component in the circuit. Therefore, all of the components in a series connection carry the same current.Disadvantages: 1.If one point breaks in the series circuit,the total circuit will break.2. As the number of components in a circuit increases ,greater will be the circuit resistance.