Answers
Answer: 114.4 GJ
Explanation:
Heat loss Q=U×A×ΔT
Heat loss of size A is determined by the U value of materials and the difference in temperature.
From 10.9cm from the ice
50m= 5000cm
A= 5000×5000
Q== (10.9) (5000) (5000)(4.184)(1×4 + 80)
Q = 95,771,760,000J
Q≈ 95.8 GJ
Linear gradient from the bottom of the pond to the ice:
Q = (89.1)(5000)(5000)(4.184)(1*2)
Q = 18,639,720,000J
Q ≈ 18.6 GJ
Total heat loss:
Q= 95.8GJ + 18.6GJ
Q= 114.4 GJ
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Which statements explain why theories change over time? Check all that apply. Scientists change the definition of theory to have their ideas accepted. New information and technology may be developed that influence the theory. Theories change with each new generation of scientists. New experimental methods provide new information. Theories may or may not be supported by new information.
The boom is supported by the winch cable that has a diameter of 0.5 in. and allowable normal stress of σallow=21 ksi. A boom rises from pin A to B, at angle phi from horizontal. A cable goes up from the load to B and then left to a pulley. Determine the greatest weight of the crate that can be supported without causing the cable to fail if ϕ=30∘. Neglect the size of the winch.
A.
O B.
Total internal reflection is possible when light travels from air to medium B to medium A.
Total internal reflection is possible when light travels from medium A to medium B.
Total internal reflection is possible when light travels from medium B to medium A.
D. Total internal reflection is possible when light travels from air to medium A.
E. Total internal reflection is possible when light travels from air to medium B.
C
C.
Answers
Final answer:
If the refractive index of medium A is greater than that of medium B, then total internal reflection is possible when light travels from medium B to medium A.
Explanation:
If the refractive index of medium A is greater than that of medium B, then total internal reflection is possible when light travels from medium B to medium A.
Learn more about Refraction of light
Answers
Answer: The correct answer is zero work done.
Explanation:
Work is said to be done when the object moves through a distance when the force is applied to the object.
If the object does not move a distance even the force is exerted on the object then the work done is zero in this case.
Therefore, when the force is exerted even when no work is done then this is called zero work done.
Final answer:
Force is experienced even when no work is done, such as when pushing against a wall. This is due to the fact that work in physics requires force to be applied over a distance. When no movement occurs, no work is done, yet a force was still exerted.
Explanation:
The concept you're referring to is known as force, a fundamental aspect in Newton's laws of motion. According to Newton's third law, every action has an equal and opposite reaction. So, when you push against a wall, it pushes back with an equal amount of force, even though no movement occurs, and therefore no work is done. This is due to the role distance plays in the calculation of work. In the physics sense, work is done when a force is applied over a certain distance.
This is also tied to the concept of potential energy. For example, when a force causes an object to deform, such as compressing a spring, the work done is stored as potential energy in the object until it is released. Yet, if the object does not move or deform, no work has been done, but a force was still exerted.
Learn more about Force without Work here:
#SPJ3
c) the total cost of running all of the appliances non-stop for 5 days if the electricity rate is $0.1 per KW-Hr.
Answers
Answer:
(a) %a, 10 A, 0.833 A
(b) 12 ohm
(c) $22.8
Explanation:
Power of toaster, P1 = 600 W
Power of iron, P2 = 1200 W
Power of bulb, P3 = 100 W
V = 120 V
As they are in household circuit, so they are connected in parallel, so the voltage is same for all.
(a) Use the formula P = V x i
Current in toaster, i1 = P1 / V = 600 / 120 = 5 A
Current in iron, i2 = P2 / V = 1200 / 120 = 10 A
Current in bulb, i3 = P3 / V = 100 / 120 = 0.833 A
(b) Resistance of heating element of iron is R2.
V = i2 x R2
120 = 10 x R2
R2 = 12 ohm
(c) Total energy consumed in 24 hours for 5 days
= (600 + 1200 + 100) x 24 x 5 = 228000 Wh = 228 KWh
Cost of 1 KWh = $0.1
Cost of 228 KWh = 0.1 x 228 = $22.8
_______________________________
Answer:
(a). Toaster = 5A
Iron = 10A
Bulb = 0.833A
(b). R2 = 12Ω
(c). $ 22.8
_______________________________
Explanation:
Given,
Power of Toaster, P1 = 600W
Power of Iron, P2 = 1200W
Power of Bulb, P3 = 100W
Potential difference = 120V
They all are connected in parallel combination because they all are household circuits so that the voltage is same for all appliances in the circuit.
★Solution of(a)
By using the formula of powerwe can find out the current.
P=V×I
Here, power is directly proportional to the potential difference and electric current flowing through the circuit.
[.°.I=P/V]
Here,electriccurrent is inversely proportional to the potential differenceandelectric currentisdirectly proportional topower.
Current in Toaster, I1 = P1/V = 600/120 = 5A
Current in Iron, I2 = P1/V = 1200/120 = 10A
Current in Bulb, I3 = P1/V = 100/120 = 0.833A
★Solutionof(b)
Resistance of Heating coil of Iron
By using theformula of Ohm's Law we can find out the resistance of heatingcoil of iron.
V=I×R
Here, the potential difference is directly proportional to the current carrying wire and potential difference is directly proportional to the resistance off the wire present in the Iron.
[.°.R=V/I]
Here, resistance is directly proportional to the potential difference and resistance is inversely proportional to the electric current.
R=V/I
=> R = 120/10
.°. R = 12Ω
★Solutionof(c)
Total consumption of Energy in 24 hours for 5 days = (600W + 1200W + 100W) × 24 hours × 5 days
= 228000Wh
= 228kWh
When the cost of 1kWh = $ 0.1
So,
The cost of 228 kWh = $ 0.1 × 228 = $ 22.8
_______________________________
Answers
Answer:
Explanation:
Magnetic moment of current carrying loop
= current x area
= 2 x π x .1²
M = .0628 unit . it is in j direction so vecor form of it
M = .0628 j
Magnetic field B = 3i + 4 j
Energy
= - M.B
- .0628 j . ( 3i + 4 j )
= - .2512 J
Here ΔI/Δt characterizes the rate at which the current I through the inductor is changing with time t.
Based on the equation given in the introduction, what are the units of inductance L in terms of the units of E, t, and I (respectively volts V, seconds s, and amperes A)?
What EMF is produced if a waffle iron that draws 2.5 amperes and has an inductance of 560 millihenries is suddenly unplugged, so the current drops to essentially zero in 0.015 seconds?
Answers
Answer:
Explanation:
E= −L ΔI / Δt.
L = E Δt / ΔI
Hence the unit of inductance may be V s A⁻¹
or volt s per ampere .
In the given case
change in current ΔI = - 2.5 A
change in time = .015 s
L = .56 H
E = − L ΔI / Δt.
= .56 x 2.5 / .015
= 93.33 V .
Answers
Answer:
Explanation:
Given
Electric Field strength
charge of electron
Force on the charge particle is given by
but this force will be acting in the direction opposite to the direction of Electric field because electron is negatively charged