A heater with an effective resistance of 4.8 ohms is connected to 240.0 volts if it operated approximately 25% of the time and electricity costs $0.10 per kWh what will be the electrical bill for30 days

Answers

Answer 1
Answer:
-- Power used when the heater is running =

                         V²/R = (240)²/4.8= 12,000 watts. (12 KW)

(A gigantic heater ... suitable for maybe a theater, not for a home.)

-- Energy consumed in one day:

                 (12 KW) x (24 hours) x (25%) = 72 KwH per day

-- Energy consumed in 30 days:  (72 KwH/day) x (30 days) =

                  2,160 KwH in 30 days

-- Cost = ($0.1 / KwH) x (2,160 KwH) = $216.00  in 30 days



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A baseball player runs 27.4 meters from thebatter’s box to first base, overruns first base by
3.0 meters, and then returns to first base.
Compared to the total distance traveled by the
player, the magnitude of the player’s total
displacement from the batter’s box is
(1) 3.0 m shorter (3) 3.0 m longer
(2) 6.0 m shorter (4) 6.0 m longer

Answers

Distance is a measure of the length of space covered over a certain period of time. While displacement is the change in position of an object from its starting point. Displacement is 6.0 meters shorterthan distance.

  • Starting position = batter'box

  • Batter's box to first base = 27.4 meters

  • Distance beyond first base = 3 metres

  • Final position = first base

Total distance covered :

(Batter's box - > first base) + (beyond first base) + (return to first base)

  • (27.4 + 3 + 3) = 33.4 meters

Total Displacement :

(Batter's box - > first base) + (beyond first base) - (return to first base)

  • (27.4 + 3 - 3) = 27.4 meters

Difference in magnitude of Distance and Displacement :

  • 33.4 - 27.4 = 6.0 meters

Therefore, displacement is 6m shorter

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Answer:

(2) 6.0 m shorte.

Explanation:

Total distance = Distance from batter’s base to first base + Distance covered in overrunning + Distance covered in returning to first base  

Total Distance = 27.4 + 3 + 3 = 33.4 m

Total displacement = Displacement from batter’s base to first base + Displacement covered in overrunning + Displacement covered in to returning first base  

The 2nd and 3rd term will have same magnitude but opposite direction so, they will cancel out each other. Hence,  

Total Displacement = 27.4 m  

Hence, displacement will be 6.0 m shorter than distance.

if we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface we're really trying to figure out the

Answers

illuminance of a surface

Why does hot air rise?

Answers

It rises because hot air is less dense than cool air.
Difference in the densities.

describe the various renewable resources of energy that have the potential to fulfill the needs of the society

Answers

As a whole, renewable energies are big advantage for society because the source are just easy to access and you need not to pay. Here are the renewable resources:
(1) Solar Power - It is a way of obtaining usable energy from the light of the sun. Why not take advantage of the increasing heat of the sun as energy?
(2) Wind Power - It is a way of obtaining usable energy from the wind. There are places in the world that is very windy.
(3) Hydropower - It is a way of obtaining usable energy from water that falls or moving. Because of the force it exerts, most especially to waterfalls, it create a big push to produce energy.

Which of the following is a chemical property of a mineral?A Hardness
B Luster
C Atomic structure
D Color

Answers

Hardness, color , and luster.

But since you can pick one, I would say hardness

Final answer:

The chemical property of a mineral is its atomic structure, which influences its chemical behavior.

Explanation:

The correct answer is C Atomic structure. A chemical property of a mineral refers to the behavior of a mineral when it undergoes a chemical change or reaction.

Atomic structure is a chemical property because it determines the way in which the atoms of a mineral are arranged and bonded together, which influences its overall chemical behavior.

For example, the atomic structure of a mineral can determine its reactivity with acids or its ability to conduct electricity.The chemical property of a mineral could be derived from its atomic structure.

The atomic structure, which includes the number of protons, neutrons, and electrons in an atom of the element, determines the behavior of the element in a chemical reaction. Hardness, luster, and color are considered physical properties of the mineral, not chemical. Example, quartz (a common mineral) has a specific atomic structure that makes it react to acid differently than a mineral like calcite.

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What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases?The resistance has increased.
The volts have decreased.
The power has increased.

Answers

If energy input remains constant and voltage remains the same in a circuit, but the current decreases, the power has increased. It is presented in the equation P = VI where P is power, V is voltage and I is current.