Choose the correct words from the box to complete the definition of resistance.
current difficulty ease potential difference
The electrical resistance of a material is a measure of the ______________ of passing a ______________ through it.
Answer:
Opposition of passing a electric circuit
The process of sediments being compacted and cemented to form sedimentary rocks is called
Answer:
Lithification is the answer.
A 12 kg object is moving at 10 m/s to the right. It collides with a 20 kg object moving at 7
m/s to the right. What speed will the objects move together after they collide and stick
together?*
a) 5.27 m/s
b) 08.13 m/s
c) 3 m/s
d) 17.23 m/s
Answer:
Change in velocity
−2−10=−12
Time required is 4 seconds
a=Δv/t
=−12/4
=−3m/s²
Hence,
option C is correct answer.
a wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was sone on the wagon how much force did the student apply assuming that it was constant
Answer:
Force=2.484 N
Explanation:
[tex]f = \frac{w}{gh} \\ = \frac{297}{9.8 \times 12.2} \\ f = 2.484 \: n [/tex]
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A wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was done on the wagon force did the student apply is 24.34 N.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
work = force*distance
force = work/distance
force = 297/12.2
force = 24.34 N
A wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was done on the wagon force did the student apply is 24.34 N.
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Tom puts a metallic cover over his car's windshield after parking. How does this control
the sun's rays during a sunny day?
What happens when a pebble lying on the ground is kicked?
A. Energy is completely lost.
B. Energy is created.
C. Energy is destroyed.
D. Energy is transferred.
Answer:
I'm 100% sure it's D. but if it isn't, sorry :(
Height of tallest wave possible
How do you find your target heart rate for a female
subtract your age from 220
Which of the following accurately describes how scientists use models?
A. To make science seem more complex and inaccessible
B. To take measurements of an object, process, or system as it is in
nature
C. To make direct observations of a natural object, process, or
system
D. To represent objects, processes, and systems that are too large,
too small, or too complex to study directly
Answer:
D
Explanation:
To represent objects, processes, and systems that are too large, too small, or too complex to study directly
The correct option is (d) To represent objects, processes, and systems that are too large, too small, or too complex to study directly.
Scientists employ models to comprehend phenomena they are unable to directly observe. Models aid scientists in their understanding of phenomena, no matter how big or little they may be, such as the universe or an atom. Additionally, they can aid in their understanding of systems like weather patterns.In a range of scientific disciplines, from physics and chemistry to ecology and the Earth sciences, scientific models are employed to explain and forecast the behavior of real things or systems.Models can aid in scientific prediction, understanding of processes, and communication of ideas.
The 4 types of scientific models -
Analogies diagrams, Physical replicas, Mathematical representations.Simulations on a computer.Learn more about scientific models brainly.com/question/14250312
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how are electromagnetic waves produced
Answer:
Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.
Answer: Electromagnetic waves are the combination of electric and magnetic field waves produced by moving charges.
The creation of all electromagnetic waves begins with a charged particle. This charged particle creates an electric field (which can exert a force on other nearby charged particles). When it accelerates as part of an oscillatory motion, the charged particle creates ripples, or oscillations, in its electric field, and also produces a magnetic field (as predicted by Maxwell’s equations).
Once in motion, the electric and magnetic fields created by a charged particle are self-perpetuating—time-dependent changes in one field (electric or magnetic) produce the other. Both electric and magnetic fields in an electromagnetic wave will fluctuate in time, one causing the other to change.
Electromagnetic waves (photons) are produced anytime a charged particle experiences a change in velocity.. The electromagnetic wave (radiation) that is produced when the charge particle changes it’s velocity is how energy is conserved. This energy is light.
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Explanation:
How many seconds will it take for a the International Space Station to travel 450 km at a rate of 100 m/s?
Time = (distance) / (speed)
Time = (450 km) / (100 m/s)
Time = (450,000 m) / (100 m/s)
Time = 4500 seconds (that's 75 minutes)
Note:
This is about HALF the speed of the passenger jet you fly in when you go to visit Grandma for Christmas.
If the International Space Station flew at this speed, it would immediately go ker-PLUNK into the ocean.
The speed of the International Space Station in its orbit is more like 3,100 m/s, not 100 m/s.
Please help
What differentiates one layer of the atmosphere from one another?
Please help
Answer: The stratosphere and the troposphere are defined by the variation in temperature with height. Within a troposphere, the temperature drops as altitude increases, and drops fast enough for convection to occur. Whereas within a stratosphere, the temperature rises with increasing altitude. Features of the atmosphere change with altitude: density decreases, air pressure decreases, temperature changes vary. Different temperature gradients create different layers within the atmosphere. The lowest layer is the troposphere where most of the atmospheric gases and all of the planet's weather are located.
Explanation:
When you stretch a spring, there is energy in the spring's
potential energy store. What word completes the sentence?
Answer:
field strength i think, I'm not that sure.
How fast is a skydiver going after 5 seconds or free fall and how far did he fall
Answer:
It's typically around 120mph. You'll reach this speed a few seconds into your jump, so for those few moments straight out the door, you'll be falling a bit more slowly and therefore covering less distance. We usually estimate around 10 seconds for the first 1,000 feet, then 5 seconds for each 1,000 feet after that.
Explanation:
Someone who strength trains twice a week can reduce their muscle loss percentage from % to % every decade.
14
A measure of the gravitational force exerted on an object?
A Weight
B) Force
C)Air resistance
Answer:
C
Explanation:
Answer:
A) weight
Explanation:
Hope it helps :))
Explain the difference between velocity and acceleration.
Answer:
velocity has direction and acceleration doesn't
A drone flies upward with a velocity of 5m/s and has a kinetic energy of 90J What is the mass of the drone?
O 5.4 kg
1.9 kg
7.2 kg
3.6 kg
Answer:
m = 7.2 kg
Explanation:
Given that,
The velocity of the drone, v = 5 m/s
The kinetic energy of the drone, E = 90 J
We need to find the mass of the drone. The formula for the kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 90}{(5)^2}\\\\m=7.2\ kg[/tex]
So, the mass of the drone is 7.2 kg.
Wave A has a frequency of 1.6 Hz, and Wave B has a frequency of 3.2 Hz. If Wave A has a wavelength of 1.0m, what do you expect will be the wavelength of Wave B?
OPTIONS:
A) 2.0m
B) 1.0m
C) 0.50m
D) 0.25m
Answer:
C
Explanation:
A- velocity=wavelength*frequency
velocity=1.0*1.6.......=1.6 m/s
B- wavelength=velocity/frequency
wavelength=1.6/3.2.....=0.5 meters
DUE TONIGHT, JUST NEED TO CONFIRM ANSWER
3. An object moves in uniform circular motion with a centripetal force of 4.5 N. Which of the following is true?
(A) The object’s velocity vector is constant in magnitude and direction.
(B) The object’s acceleration vector is constant in magnitude and direction.
(C) Both the object’s velocity and acceleration vectors change both their magnitudes and directions.
(D) Both the object’s velocity and acceleration vectors have constant magnitudes but change directions.
Answer:
the answer is D I THINK
Explanation:
What is the mass of a large ship that has a momentum of 1.60x10^9 kg*m/s and is moving at a velocity of 10m/s?
Answer:
160000000 kg.
Explanation:
p=mv
p=1.6x10^9
v=10m/s
rearrange and substitute:
(1.6x10^9)=m(10)
m=(1.6x10^9)/10
m= 1.6x10^8 kg.
Radon-220 is a radioactive gas. It escapes from underground rocks and causes a large part of the natural background radiation in the United Kingdom. It has an atomic number of 86. How many neutrons are there in its nucleus?
Answer: 134 neutrons are there in the nucleus of Radon-220
Explanation:
Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.
Thus, number of protons = atomic number = 86
Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.
Mass number = Number of protons + Number of neutrons
220 = 86 + Number of neutrons
Number of neutrons = 134
What is the limiting factor of speed for an object falling through a vacuum?
⭐Air Resistance is the factor, which limits the speed of an object falling through the air...⭐
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Nuclear reactions occur when the nuclei of two different atoms collide to produce products that are different from the starting substances. How is this similar to a chemical change?
a. a chemical change can easily be reversed.
b. in a chemical change, mass can be created
c. in a chemical change, energy can be created
d. in a chemical change, a new substance forms
Nuclear reactions are independent of the chemical form of the element.
Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.
D.
Which of these is not a standard unit?
a. second
b. metre
c. hand span
d. gram
Answer: Hand span
Explanation: Hand span is not a standard unit.
Second is the unit of time.
Meter is the unit of length or distance covered by an object.
Gram is the unit of weight of an object.
Hand span is not a standard unit. This is because the size of hand varies from person to person. Hence, the correct option is (c) "hand span".
A square brass plate has large circular hole cut in its centre. If the plate is heated, it will expand. Will the diameter of the hole expand or contract? Explain your answer.
Does California have enough water?
Answer:
As the world's largest, most productive, and most controversial water system, it manages over 40 million acre feet (49 km3) of water per year. Water and water rights are among the state's divisive political issues. Due to the lack of reliable dry season rainfall, water is limited in the most populous U.S. state.
newtons = mass x _______
a) capacitance
b) inductance
c) gravitational field strength
Answer:
c) gravitational field strength
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A 500g glass statue is accidentally knocked from a shelf 1.5m high. If 3% of the gravitational potential energy is converted into heat, how much does the statue’s temperature rise
Answer:
0.0001158443168226212 Celcius (significant digits? who cares.....) or about 0.00021 Fahrenheit
Explanation:
500g=0.5kg
PE=mgh
PE=(0.5)*(9.81)*(1.5)
PE=7.36J
3% of 7.36 is 0.22J is converted to heat
From there, it's tricky.
I just used a joules to celcius converter to get 0.0001158443168226212 degrees celcius or 0.00021 degrees fahrenheit rise in temp.
Which type of waves are able to travel through various types of media and space
a) body
b) electromagnetic
c) parabolic
Answer:
B
Explanation:
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