Let's see
Use snells law
[tex]\\ \rm\Rrightarrow \dfrac{n_1}{n_2}=\dfrac{sini}{sinr}[/tex]
[tex]\\ \rm\Rrightarrow \mu=\dfrac{sin30}{sin19.9}[/tex]
[tex]\\ \rm\Rrightarrow \mu=0.5/0.34[/tex]
[tex]\\ \rm\Rrightarrow \mu=1.47[/tex]
It may be glass
The time required by 1KW heater to raise the temperature of 10 liters through 10 degree selsius is in the of 5 m
The time required by the 1 KW heater to raise the temperature of 10 L of water is 418.4 s
Data obtained from the questionPower (P) = 1 KW = 1000 WVolume of water = 10 LMass of water (M) = 10 × 1000 = 10000 gChange in temperature (ΔT) = 10 °C Specific heat capacity (C) = 4.184 J/gºC Time (t) = ?How to determine the timeQ = MCΔT
Q = Pt
Pt = MCΔT
Divide both sides by P
t = MCΔT / P
t = (10000 × 4.184 × 10) / 1000
t = 418.4 s
Complete question
What time is required for a 1kw heater to raise the temperature of 10 liters of water to 10 degree Celsius?
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Ronnie kicks a playground ball with an initial velocity of 16 m/s at an angle of 40° relative to the ground. what is the approximate horizontal component of the initial velocity? 0.64 m/s 0.77 m/s 10.3 m/s 12.3 m/s
The horizontal component of the velocity with which Ronnie kicks a playground ball is 12.3 m/s.
Horizontal component of the velocity
The horizontal component of the velocity with which Ronnie kicks a playground ball is calculated as follows;
Vx = Vcosθ
where;
V is the initial velocityθ is the angle of projectionVx = 16 x cos(40)
Vx = 12.3 m/s
Thus, the horizontal component of the velocity with which Ronnie kicks a playground ball is 12.3 m/s.
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Answer:
D) 12.3
Explanation:
took the test
Which components of static electricity does a photocopier use?
ex. charging by conduction, friction, etc
Answer:
For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper. These tasks are accomplished by the corona wires. These wires are subjected to a high voltage, which they subsequently transfer to the drum and paper in the form of static electricity.
Active energy is a characteristic of _______ energy.
Answer:
Active energy is a characteristic of Kinetic energy
Which statements describe some of the original ideas proposed about the universe during the big bang? check all that apply. the universe exploded. the universe was opaque. the universe was one second old. the universe was very hot and dense. the universe expanded from a single point.
The statements which describe some of the original ideas proposed about the universe during the big bang include:
The universe was opaque.The universe was very hot and dense.The universe expanded from a single point.What is Big bang theory?This is the theory about the formation of the universe which states that a single point began to expand which resulted in its formation.
This was as a result of observations and ideas which can be seen mentioned above.
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Answer:
B. The universe was opaque.
D. The universe was very hot and dense.
E. The universe expanded from a single point.
Explanation:
A nuclear power plant is built alongside a river. what measurements should a monitoring station downstream record to be sure that the proper procedures are being followed at the power plant? density and radiation levels radiation levels and dust levels salt concentration and temperature temperature and radiation levels
Nuclear power plant should have monitoring units and water purifiers units, so thet they followed propress in the plant.
What is nuclear power plant?
Nuclear power plant is a structure that allows the generation of energy from the fission of toxic materials. It is usually due to the risk of accidents. Nuclear energy is very important for the generation of electricity in many countries.
Hence, water purifiers units should be used in the downstream to measure to protect river should be taken.
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Answer:
temperature and radiation levels
Explanation:
edge
How can your physical health change with cardio activity? explain why.
Answer:
Other benefits include:
Increases blood flow and decreases chances of stroke.Improves memory and thinking ability.Combats decline in brain functioning with age.Helps protect against developing Alzheimer's disease.Fights osteoporosis and reduces chances for a hip fracture.Regular physical activity is one of the most important things you can do for your health. Being physically active can improve your brain health, help manage weight, reduce the risk of disease, strengthen bones and muscles, and improve your ability to do everyday activities.
Adults who sit less and do any amount of moderate-to-vigorous physical activity gain some health benefits. Only a few lifestyle choices have as large an impact on your health as physical activity.
Everyone can experience the health benefits of physical activity – age, abilities, ethnicity, shape, or size do not matter.
PLEASE HELP ME I ATTACHED A SCREEN SHOT PLS SOLVE ASAP
Answer:
B. Negative acceleration means this car is slowing down.
Explanation:
for the other screenshot
Average acceleration = change in velocity /change in time.
[a = ∆V/∆t] —this the formula.
NOTE:
u = initial velocity (velocity it started with)
v = final velocity (velocity it ended with)
t = time {the time you were given)
a = acceleration.
listing out our givens:
u =o —(the unit is m/s)
v = 40 —(the unit is also m/s)
t = 0.08 —(the unit is s) "s" means second(s).
Soo
a = 40-0 / 0.08 = 500 m/s² ( unit for velocity is m/s²)
( Remember when using the formula we subtract the initial from the final velocity.........I mean we remove the initial from final) if not you will get a negative answer or wrong answer).
also note: final velocity is always bigger in value than initial velocity EXCEPT it is in deceleration meaning for example a car that was speeding is gradually stopping then initial (the one it started with) will be bigger than the one it ended with (because as it gradually stops the speed reduces).
VELOCITY is speed in a specified direction.
you're super free to ask any questions
Good luck ✅.
Students design an experiment to determine how much force is needed to move blocks of wood of different masses slowly across a lab table.
Which procedure should students include in their design?
A. conduct 5 trials, using a different scale to pull each block of wood
B. conduct 5 trials, pulling a different side of each block each time
C. conduct 5 trials, using a different table for each trial
D. conduct 5 trials, pulling each block of wood in the same way for each trial
It would be really helpful if someone answered this.
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
According to first law of reflection, we know that :
Angle made by the incident ray and normal [ i.e angle of incidence ] is always equal to Angle made by the reflected ray and normal [ i.e Angle of reflection ]
Therefore, we can say that the missing angle (angle of reflection) has the same value as the angle of incidence which is equal to 45°
Please read the statement through to understand the procedure ~
A photon has an energy of 2.88 x 10^-18 j. convert this energy into ev.
Answer:
E = V Q voltage * charge
Since the charge on an electron is e = 1.6E-19 coulombs
the energy of 1 eV is 1.6E-19 joules
E = 2.88E-18 joules / 1.6E-19 joules/electron volt
E = 18 eV
Question 12 (True/Faise Worth 5 points)
The presence of free electrons makes a material a good insulator.
O True
O False
Which layer of the sun can easily be viewed by visible light?.
Select the correct answer. kristina works out seven days a week. lately, she has been tired, and her body aches. if she is overtraining, which training principle should kristina consider before continuing her program? a. overload b. recovery c. transfer d. variation
Answer:
Select the correct answer. kristina works out seven days a week. lately, she has been tired, and her body aches. if she is overtraining, which training principle should kristina consider before continuing her program? a. overload b. recovery c. transfer d. variation
b recovery
a) The velocity of a moving body is t2 - t metres per second after a time of t seconds. Find the displacement of the body at the end of 12 seconds if the initial velocity is 0 metres per second.
Explanation:
The integral of a velocity versus time function is a displacement versus time function
So we integrate,
[tex] {t}^{2} - t[/tex]
The integral of that is
[tex] \frac{1}{3} {t}^{3} - \frac{ {t}^{2} }{2} [/tex]
Plug in 12 for t,
[tex] \frac{1}{3} (12 {}^{3} ) - \frac{12 {}^{2} }{2} [/tex]
[tex]576 - 72 = 504[/tex]
So the displacement is 504 meters to the right.
vf = 12² - 12 = 132 m/s
a = vf' = 2t-1
at t =12 s,
a = 2(12)-1 = 23 m/s²
vf²=vi²+2ad (vi=initial velocity=0)
vf²=2ad
132² = 2 x 23 x d
d = 378.78 m
If temperature is constant, the volume of a gas varies inversely as its pressure. A gas with a pressure of 150 pounds per square inch occupies a volume of 25 cubic feet. What is the constant of proportionality for this variation?.
If temperature is constant, the volume of a gas varies inversely as its pressure. The constant of proportionality for this variation is 3750.
What is temperature?Temperature is the degree of hotness or coldness of the object.
According to the ideal gas law, pV =nRT
where, p=pressure of gas, V =volume of gas, n=number of moles of element of gas, R=Universal Gas constant and T =temperature
When the temperature is constant,
PV =constant =k
k = 150x 25
k = 3750
Thus , the constant of proportionality is 3750.
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What does the model below represent?
2CO + O2 ——-> 2002
O A. The production of oxygen
O B. An experiment
O C. A release of heat
O D. A chemical reaction
Answer:
D
Explanation:
Because we have two reactants and product
An 95 Watt TV is plugged into a 115 volt circuit.
The TV operates for 120 minutes. If the cost of energy is
8¢ per kW-hr, how much does it cost to run the TV
for 120 minutes?
120 min = 2 hours
95 x 2 : 1000 =0.19 kwh
8¢ x 0.19 kwh = 1.52¢
The cost of running the 95 W TV for 120 minutes if charged at 8 ¢ per kWhr is 1.52 ¢
How to determine the energyPower ( P) = 95 W = 95 / 1000 = 0.095 KWTime (t) = 120 mins = 120 / 60 = 2 hrEnergy (E) =?E = Pt
E = 0.095 × 2
E = 0.19 KWhr
How to determine the cost of operationEnergy (E) = 0.19 KWhrCost per KWhr = 8 ¢ Cost =?Cost = Energy × Cost per KWhr
Cost = 0.19 × 8
Cost = 1.52 ¢
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what is a short circuit
Answer:
It is a circuit that is easily damaged
The long structure of small intestine is accommodated in small space within our body. Comment.
What is an example of an analogue signal?
Examples of analog signals are Human voice, Thermometer, Analog phones etc.
What is signal?Signal is defined as an electromagnetic wave that carries information through a medium. In this, the data is converted into electromagnetic signal which may be analog or digital and then sent from sender to receiver.
Signal which are continuous as time varies are analog signals.
Thus, examples of analog signals are Human voice, Thermometer, Analog phones etc.
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Answer:
Examples of analog signals are Human voice, Thermometer, Analog phones etc. Examples of digital signals are Computers, Digital Phones, Digital pens, etc.
Let each shake of the pennies or thumbtacks represent 1 year. what is the half life, in years, for the pennies in experiment 1? what is the half-life, in years, for the thumbtacks in experiment 2?
(5.4.3 lab - nuclear physics)
The half-life of the pennies in experiment 1 and 2 will be the time it takes for half the pennies to fall off after shaking.
What is Half-Life?Half-Life is the time required for half the amount one a given substance to disappear or decay.
The half-lives of substances are usually constant values.
For example, the Half-Life of radioactive carbon-14 is 5700 years.
Therefore, the half-life of the pennies in experiment one and two will be the time it takes for half the pennies to fall off after shaking.
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2 neutral metal spheres, A and B, are touching each other.
A negatively charged rod is brought near to B.
(a) Draw the charges induced on the 2 spheres.
The negatively charged rod is now brought closer to touch B.
(b) Explain why A momentarily moves away from B.
i need help with b
Water waves in a small tank are 6.6 m long. They travel at a speed of 2.9 m/s. What is the frequency of the water
waves?
Answer:
.439 Hz
Explanation:
Wavelength = 6.6 m
speed = 2.9 m/s
2.9 = 6.6 f
f = 2.9/6.6 = .439 Hz
A truck travels a curve of radius 17 m and the mass of the truck is 5,900kg. The force of the truck is F = 2.685 x ?
The acceleration of the truck is 45.5 m/s² and the velocity of the truck is 27.8 m/s.
Acceleration of the truck
The acceleration of the truck is calculated as follows;
F = ma
a = F/m
a = (2.685 x 10⁵)/(5900)
a = 45.5 m/s²
Velocity of the trucka = v²/r
v² = ar
v² = 45.5 x 17
v² = 773.64
v = 27.8 m/s
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An ammeter is a device that measures _____.
the type of charge on a resistor
the current through a resistor
the voltage across a resistor
the potential of the battery
Line segment gj is a diameter of circle l. angle k measures (4x 6)°. circle l is inscribed with triangle g j k. line segment g j is a diameter. line segments g k and k j are secants. angle k has a measure of (4 x 6) degrees. what is the value of x? 21 24 32 44
The value of x in the given right triangle in a semicircle is determined as 21.
What is the measure of a triangle in a semicircle?The triangle in a semicircle is always a right angle triangle.
From the figure shown, we can say that the triangle G J K is right triangle and m<K = 90degrees.
Given that m<K = 4x + 6, we will can use the following equation to find the value of x as shown:
4x + 6 = 90
4x = 90 - 6
4x = 84
x = 21
Thus, the value of x in the given right triangle in a semicircle is determined as 21.
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The _________ region is where a land or water air mass is formed.
Group of answer choices:
source
atmospheric
primary
hilly
Answer:
atmospheric
Explanation:
I think it’s atmospheric if I, wrong please tell me and I will fix it thanks!
Adrian plays basketball with Kevin on a basketball court that is completely level. After Adrian makes as basket, their ball rolls to a complete stop. what forces acted on the ball to cause it to stop rolling?
A. acceleration and gravity
B. friction and acceleration
C. gravity and friction
D. magnetic forces and friction
Describe the electric and magnetic fields of an electromagnetic wave.
Answer:The electric field and magnetic field of an electromagnetic wave are perpendicular (at right angles) to each other. They are also perpendicular to the direction of the EM wave. EM waves travel with a constant velocity of 3.00 x 108 ms-1 in vacuum.
Explanation:
