The miracle year for Albert Einstein was the year 1905 within which he published so many renowned papers.
When was Einstein miracle year?The miracle year for Albert Einstein was the year 1905 within which he published so many renowned papers in a short time and became very popular.
His mindset in that year was one that challenged the orthodox explanations and sought to think outside the box.
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A 1050 w electric toaster operates on a household circuit of 120 v. what is the resistance of the wire that makes up the heating element of the toaster
The Resistance of the wire that makes up the heating element of the toaster is 13.75Ω.
What is Resistance?
Resistance is the measure of the opposition to current flow in an electrical circuit.
S.I. Unit of resistance is ohms, symbolized by the Greek letter omega (Ω)
Also from Ohm's Law,[tex]R=\frac{V}{I}[/tex]
From power-current relation
P=VI
Also, [tex]I=\frac{P}{V}[/tex]
[tex]I = \frac{1050}{120}[/tex]
I = 8.75 A
From Ohm's Law,[tex]R=\frac{V}{I}[/tex]
[tex]R = \frac{120}{8.75}[/tex]
R = 13.75 Ω
The Resistance of the wire is 13.75 Ω
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Four students measured the acceleration of gravity. the accepted value for
their location is 9.78 m/s2. which student's measurement has the largest
percent error?
The student 4 measurement has the largest percent error. The discrepancy between the calculated value and the correct value is referred to as an "error" in statistics.
What is the error?An error is a mistaken or erroneous action. In some contexts, an error is interchangeable with a mistake.
The complete question is
'Four students measured the acceleration of gravity. The accepted value for their location is 9.78m/s2. Which student’s measurement has the largest percent error?
A. Student 4: 9.61 m/s2
B. Student 3: 9.88 m/s2
C. Student 2: 9.79 m/s2
D. Student 1: 9.78 m/s2"
The percentage error is found as;
[tex]\rm \% error = \frac{a_A-a_E}{a_E} \times 100[/tex]
The percentage error in the gIven four students is obtained by putting the values in the given problem;
Student 1 ;
[tex]\rm \% error = \frac{9.78-9.78}{9.88}\times 100 \\\\\ \% error = 0 \%[/tex]
Student 2 ;
[tex]\rm \% error = \frac{9.78-9..79}{9.79}\times 100 \\\\\ \% error = - 0.10 \%[/tex]
Student 3 ;
[tex]\rm \% error = \frac{9.78-9.88}{9.88}\times 100 \\\\\ \% error = - 1.01 \%[/tex]
Student 4 ;
[tex]\rm \% error = \frac{9.78-9.61}{9.61}\times 100 \\\\\ \% error =1.77\%[/tex]
Student 4 reports the maximum percentage error.
Hence the student 4 measurement has the largest percent error.
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Where are heavier elements, like iron or gold made?
*
1 point
In space, between the stars
in the black holes at the centers of galaxies
In the hearts of stars
They were made as part of the big bang
Answer:
In the hearts of stars:
Theory tells us the elements heavier than iron are created by novas
that is when a star explodes, and any heavier elements were once created when a star exploded.
G= 10m/s
A 50kg student jumps out of a window onto a pile of mattresses.
(a) Ignoring air resistance, what is her increase in speed each second?
B) What is her change of momentum each second?
The increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.
What is the change in velocity per second for any object falling freely under gravity?The change in velocity of a moving object is known as acceleration.
For any object falling freely under gravity, the change in velocity per second or acceleration due to gravity is a constant and is equal to 10 metres per square second (10 m/s^2).
The change in momentum of a body is given as follows:
Momentum = mass × velocity Change in momentum = mv - muChange in momentum = m(v - u)acceleration = v - uwhere m is mass, v is final velocity and u is final velocity.
Mass of the student = 50 Kg
Change in momentum each second = 50 kg × 10 m/s^2 = 500 kgm/s^2
Therefore, the increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.
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when two bodies of diffrent temprature in contact, heat will
Answer:
When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at a higher temperature until they both reach the same temperature.
Explanation:
The mass of a bicyclist and a bicycle together is 53.0 kg. How much work has been
done if the bicyclist slows the bicycle from a speed of 3.84 m/s to 1.27 m/s?
(A) -68.1 J
(B) -136 J
(C) -348 J
(D) -696 J
Answer:
Approximately [tex](-348\; {\rm J})[/tex], assuming that the bike was on level ground.
Explanation:
If an object of mass [tex]m[/tex] is moving at a speed of [tex]v[/tex], the kinetic energy of that object would be [tex](1/2)\, m\, v^{2}[/tex].
At a speed of [tex]v = 3.84\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:
[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (3.84\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; & 390.76\; {\rm J}\end{aligned}[/tex].
At a speed of [tex]v = 1.27\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:
[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (1.27\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; &42.741 \; {\rm J}\end{aligned}[/tex].
The energy change was approximately:
[tex]390.76\; {\rm J} - 42.741\; {\rm J} \approx 348\; {\rm J}[/tex].
If the bike was on level ground, the friction on the bike and the cyclist would have done a work of [tex](-348\: {\rm J})[/tex] to reduce the kinetic energy of the bike and the cyclist by that amount.
Answer: C) -348J
Explanation:
42.741 - 390.76 (the kinetic energy of the two speeds) is equal to -348.
What is the piece of information that is communicated using the senses?
Which would result in a judge who is sitting beside the testing ground observing the tennis ball having a speed of 7 m/s?
Considering the frames of reference, the robot has to fire backwards at a speed of 2m/s.
What is relative velocity?The relative velocity is obtained based on the inertial frame of reference. The term velocity is always measured relatively.
Given that the inertial frame of reference is relative to the moving frame then; 7m/s - 9 m/s = -2m/s.
It then follows that the robot has to fire backwards at a speed of 2m/s.
Missing parts:
Basim’s robotics team builds a robot that travels at 9 m/s and can fire a tennis ball at a target.
Which would result in a judge who is sitting beside the testing ground observing the tennis ball having a speed of 7 m/s?
The robot fires the ball forward with a speed of 7 m/s.
The robot fires the ball backward with a speed of 7 m/s.
The robot fires the ball backward with a speed of 2 m/s.
The robot fires the ball forward with a speed of 2 m/s.
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Answer:
C. the robot fires the ball backward with a speed of 2 m/s.
What name is given to the force on an object caused by Earth's gravitational pull?
Answer:
gravity
Explanation:
Rearrange the equation = KE
-1
2
- my? to solve for v. Show your work.
Answer:
See below
Explanation:
KE = 1/2 m v^2 multiply both sides by 2
2 (KE) = mv^2 divide both sides by m
2(KE) / m = v^2 sqrt both sides
√ [(2KE)/m ] = v
What happened when you heat the candle wax
Answer:
your hand will be heat you will feel small pain inside your hand
Pls answer, i need help :(
Answer: B
Explanation: AN increase in heat out
Which option is an example of an object that has potential energy followed by an object that has kinetic energy?
A ball held over a person's head | a ball rolling on the floor is an example of an object that has potential energy followed by an object that has kinetic energy.
What is Kinetic energy?This is the type of energy possessed by a body by virtue of its motion or movement.
The rolling ball therefore has kinetic energy while a ball being held over a person's head has potential energy which is the energy possessed by a body by virtue of its position.
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You suspect that the power supply in your desktop pc is failing. you want to use a multimeter to test the power supply. which multimeter setting should you use
The multimeter setting should you use is between 11-12 volts. If the voltage is too high or too low, the power supply must be changed.
What is a multimeter?An instrument made to measure resistance, voltage, and electric current, often across a range of values.
You think your desktop computer's power supply is malfunctioning. To test the power supply, you should use a multimeter.
Between 11 and 12 volts should be seen on the multimeter. The power supply is failing and has to be replaced if it's too high or too low.
Hence, the multimeter setting should you use is between 11-12 volts.
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If you had a 14 m long timeline, where would the extinction of the dinosaurs be?
Captionless Image
About 1 m from the end where the universe formed.
About in the middle.
About 3/4 of the way from where the origin of the universe was to the end representing now.
Less than one meter from the end representing now.
If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.
What is extinction of species?
The extinction of species or organisms is the process by which some environmental factors cause a decline in the number of species through death.
Dinosaurs are some of the examples of species that are in extinct.
Since dinosaurs are in extinction, If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.
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Which property of sound waves decreases as the square of the distance from the source increases? A. Pitch
B. Intensity C. Wavelength D. Speed
Intensity is the property of sound waves that decreases as the square of the distance from the source increases. Option B is correct.
What is a sound wave?A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
As the square of the distance from the source increases, the intensity of sound waves decreases.
Sound intensity relationship
[tex]\rm {I} = \frac{1}{r^2}[/tex]
[tex]\rm \frac{I_2}{I_1} =\frac{r_1^2}{r_1^2}[/tex]
Hence, option B is correct.
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How does newton’s third law of motion relate to a catapult?
PLEASE ANSWER ASAP. WILL GIVE BRAINLIEST
Answer: the force when the catapult swings has the same force as it does when coming down
Explanation:
for every reaction there is an equal opposite reaction
A solenoid has 18 turns per centimeter of its length. the solenoid is twisted into a circle so that it becomes shaped like a toroid. what is the magnetic field at the center of each turn of the toroid
A solenoid has 18 turns per centimeter of its length. the solenoid is twisted into a circle so that it becomes shaped like a toroid, the magnetic field at the center of each turn of the toroid is mathematically given as
B=3.39292007×10^−5 T
What is the magnetic field at the center of each turn of the toroid?Generally, the equation for magnetic field is mathematically given as
B=\mu_0 * n *I
Where
n=18
n=1800turns/m
Therefore
B=4*\pi*10^{-7}*1800*15*10^{-3}
B=3.39292007×10^−5T
In conclusion, the magnetic field at the center of each turn of the toroid is
B=3.39292007×10^−5T
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HELP!
how did Mario Molina contribute to science?
i need like a mini paragraph:(
Mario Molina helped to bring about the 1987 Montreal Protocol on substances that result in depletion of the Ozone Layer.
What is ozone layer?The topmost layer of the atmosphere which protect the harmful UV rays from the Sun to reach the Earth surface.
Mario Molina has the great contribution in science field. He tried hard and succeeded in passing an international agreement to eliminate CFCs also called as Chloro Fluoro Carbons and other ozone-depleting chemicals.
These CFCs were used in jet planes which depleted the ozone layer and a hole was observed over Antarctica.
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5.4.2 Test (CST): Earth's Resources
Question 5 of 15
▬▬
The human population grows by about 2 percent each year, showing
growth.
OA. exponential
OB. linear
OC. cubic
The human population which grows by about 2 percent each year, is showing linear growth.
What is linear increment?
A linear increment occurs when a sequence increases gradually with a constant value.
If a population increases at the rate of 2%, the incremental rate or constant factor is 2%, thus, we can conclude that the human population which grows by about 2 percent each year, is showing linear growth.
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Which statement belongs to daltons atomic theory
Atoms cannot be broken down into smaller pieces is the statement belongs to daltons atomic theory. Option B is correct.
What is an atom?The atom consists of matter that may be split without releasing electrical charges. It's also the smallest unit of matter with chemical element features.
The complete question is:
"Which statements belong to Dalton's atomic theory? Select all that apply.
A)Atoms cannot be created or destroyed.
B)Atoms cannot be broken down into smaller pieces.
C)All atoms of an element are identical.
D)Chemical reactions cause atoms to be rearranged."
According to Dalton's atomic hypothesis, atoms cannot be broken down into smaller bits.
Hence, option B is correct.
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A bat strikes a 0.145 kg baseball with force of 5800 N. What acceleration does the baseball experience?
Answer:
40,000 m/s²
Explanation:
The formula is given as Force = mass × acceleration, so then acceleration = Force / mass.
Therefore...
5800 N ÷ 0.145 kg = 40,000 m/s²
A 950-kg car strikes a huge spring at a speed of 22m/s (fig. 11-54), compressing the spring 5.0m. (a) what is the spring stiffness constant of the spring? (b) how long is the car in contact with the spring before it bounces off in the opposite direction?
(a) The spring stiffness constant of the spring is 18,392 N/m.
(b) The time the car was in contact with the spring before it bounces off in the opposite direction is 0.23 s.
Kinetic energy of the carThe kinetic energy of the car is calculated as follows;
K.E = ¹/₂mv²
K.E = ¹/₂ x 950 x 22²
K.E = 229,900 J
Stiffness constant of the springThe stiffness constant of the spring is calculated as follows;
K.E = U = ¹/₂kx²
k = 2U/x²
k = (2 x 229,900)/(5)²
k = 18,392 N/m
Force exerted on the springF = kx
F = 18,392 x 5
F = 91,960 N
Time of impactF = mv/t
t = mv/F
t = (950 x 22)/(91960)
t = 0.23 s
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A brick is kept in 2 different ways on a table as shown
below. which brick exerts more pressure? Why?
Answer:
A
Explanation:
when area increases pressure decrease
for example, a sharp nail's area is lower than a blunt nail, so sharp nail is easy to fix
so, here a exerts more pressure
Answer:
a
Explanation:
Which form of energy is converted to electrical energy in a voltaic cell?.
Answer:
chemical energy is converted to electrical energy in a voltaic cell.
Choice are 1.3 1.0 17
The current flowing in resistor 1 in the given series circuit is determined as 1.0 A.
Equivalent resistance of the circuit
The equivalent resistance of the circuit is determined as follows;
Rt = R1 + R2
Rt = 15 + 5
Rt = 20ohms
Current flowing in the circuitThe current flowing in the circuit is determined from Ohm's law.
V = IR
I = V/R
I = 20/20
I = 1.0 A
since it is series circuit, same current will flow in R1 and R2.
Thus, the current flowing in resistor 1 in the given series circuit is determined as 1.0 A.
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a carmboard 4ft x 4ft Square has the queen at the centre the queen is hit by the striker moves to the front edge, rebounds and goes inta hole behind the striking line. find the magnitude of displacement of queen a) from the centre to front edge b) from the front end edge to hole (c) from centre to hole.
Diagonal of cardboard=displacement to hole
√4²+4²4√2So displacement till edge
4√2/22√2Total distance
4√2+2√26√2ftFrom centre to hole displacement
2√2What is the most likely outcome? it will become a permanent magnet because the domains will remain aligned. it will become a temporary magnet because the domains will remain aligned. it will become a permanent magnet because the domains will easily realign. it will become a temporary magnet because the domains will easily realign.
The likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.
What is a magnet?A magnet is a material whose magnetic domains are properly aligned. These materials are able to attract other materials that are magnetizable.
Hence, the likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.
Missing parts:
A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome?
a. It will become a permanent magnet because the domains will remain aligned.
b. It will become a temporary magnet because the domains will remain aligned.
c. It will become a permanent magnet because the domains will easily realign.
d. It will become a temporary magnet because the domains will easily realign.
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Answer: D or It will become a temporary magnet because the domains will easily realign.
Explanation: Taking the quiz!
A hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
What happens according to Newton’s first law of motion?
A. The puck gradually slows down because mass makes objects slow down.
B. The puck gradually slows down because friction would be acting on it.
C. The puck does not lose any speed because ice is a very slippery surface.
D. The puck does not lose any speed because once an object starts moving, the force of friction would no longer apply to it.
According to Newton's first law of motion, the puck gradually slows down because friction would be acting on it.
What is Newton's first law?Newton's first law of motion states that an object will remain at rest or move uniformly in a straight line unless acted upon by an external force.
According to this question, a hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
However, in accordance with the first law of motion proposed by Newton, the puck gradually slows down because friction would be acting on it.
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Answer:B. The puck gradually slows down because friction would be acting on it.
Explanation:
Some iron has a coefficient of linear expansion of 12 x 10-6 / o K . A 100 mm length of iron piping is heated through 20 K. The pipe extends by:
Given that the linear expansion of the pipe is 12×10¯⁶ K¯¹, the pipe extends by 0.024 mm
Data obtained from the question Original length (L₁) = 100 mmChange in temperature (ΔT) = 20 KCoefficient of expansion (α) = 12×10¯⁶ K¯¹Change in length (ΔL) =?How to determine the new diameter
α = ΔL / L₁ΔT
12×10¯⁶ = ΔL / (100 × 20)
12×10¯⁶ = ΔL / 2000
Cross multiply
ΔL = 12×10¯⁶ × 2000
ΔL = 0.024 mm
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