Which of the following would have the highest power rating? 500 J of energy used in 100 seconds 1,000 J of energy used in 100 seconds 500 J of energy used in 50 seconds 1,000 J of energy used in 50 seconds

Answers

Answer 1

Answer: Power is defined as the work produced per unit of time. The SI unit for power is the watt, which is also equivalent to Joules per second. Given the data above, the power can be directly calculated by dividing the work (joule) by the time (second). The one that gives the highest power of 20 watts is 1,000 J of energy used in 50 seconds.

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In a series circuit, as more batteries are added what effect does it have on the bulbs in a circuit . Will the bulbs get brighter or stay the same?

Answers

If the batteries are in series too, then the more batteries,
the more voltage across the light bulbs, and the brighter
they will all burn.

(Until you add the battery that causes the weakest bulb
to burn out. Then they ALL go out.)

Which statement BEST describes how the body moves?a. Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.
b. Cardiac and smooth muscles are made of muscle fibers, nerves, and cartilage and are responsible for all movement in the body.
c. Smooth muscles, which are made of blood vessels, fibers, and nerves, allow for all activities that use slow-twitch muscle fibers.
d. Skeletal muscles, which are made of tendons, nerves, and fibers, line the body cavities and allow for support and movement.

Answers

Answer;

A. Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.

Explanation;

Muscular tissues functions in movement and locomotion through its direct connection with the skeletal system.
Skeletal muscles are responsible for moving the body. The skeletal muscle contractions pull on tendons, which as attached to bones. When the skeletal muscle contraction causes the muscle to shorten, the bone and thus the body par will move.
Skeletal muscles also provide structural support for the entire body.

Answer:

Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.

Explanation:

Scientists are working on a new technique to kill cancer cells by zapping them with ultrahigh-energy (in the range of 1012W) pulses of light that last for an extremely short time (a few nanoseconds). These short pulses scramble the interior of a cell without causing it to explode, as long pulses would do. We can model a typical such cell as a disk 5.0μm in diameter, with the pulse lasting for 4.0 ns with an average power of 2.0×1012W. We shall assume that the energy is spread uniformly over the faces of 100 cells for each pulse. (a) How much energy is given to the cell during this pulse? (b) What is the intensity (in W/m2) delivered to the cell? (c) What are the maximum values of the electric and magnetic fields in the pulse?

Answers

Answer:

a. 80 J/cell b. 1.02 × 10²¹ W/m² c. 8.77 × 10¹¹ V/m d. 2.92 × 10³ T

Explanation:

a. We know that energy E = Pt where P = power and t = time

The total energy delivered to all the 100 cells is E = average power × time

average power = 2 × 10¹² W and time = 4 ns = 4 × 10⁻⁹ s

E = 2 × 10¹² W × 4 × 10⁻⁹ s = 8 × 10³ J

The energy per cell E₁ = E/100 = 8 × 10³ J/100 = 80 J/cell

b. Intensity, I = P/A where P = power per cell = 2 × 10¹² W/100 = 2 × 10¹⁰ W and A = area = πr². Since the cell is modeled as a disk of diameter d = 5.0μm, r = d/2 = 5.0 μm/2 = 2.5 μm = 2.5 × 10⁻⁶ m

I = P/A = P/πr² = 2 × 10¹⁰ W/π(2.5 × 10⁻⁶ m)² = 1.02 × 10²¹ W/m²

c. The intensity I = E²/2cμ₀ where E = maximum value of electric field, c = speed of light = 3 × 10⁸ m/s and μ₀ = 4π × 10⁻⁷ H/m

E = √(I2cμ₀) = √(2 × 1.02 × 10²¹ W/m² × 3 × 10⁸ m/s × 4π × 10⁻⁷ H/m) = 8.77 × 10¹¹ V/m

The maximum magnetic field B is gotten from E/B = c

B = E/c = 8.77 × 10¹¹ V/m/3 × 10⁸ m/s = 2.92 × 10³ T

A current of 4A flows in a wire of resistance 60 ohm. calculate electrical energy consumed in 2 min.

Answers

Power dissipated = energy/second= (current)² x (resistance)

Power dissipated = energy / second = (4)² x (60) = 960 joules per second= 960 watts

Energy = (power) x (time) = (960 watts) x (2 minutes) x (60 sec/minute)

= 115,200 joules

Where does the energy that the sun emits come from?

Answers

The energy emitter from the sun comes from the burning of hydrogen gasses (what the entire sun is made of) allowing light and heat energy to be created/escape.

The picture above shows 3 sets of balloons, all with a particular charge. Which of the picture(s) is true? Explain. Then explain why the other 2 pictures are incorrect. Make sure to explain all 3 sets.

Answers

Among all of the others Picture 3 is correct.

We know, Like charges repel each other whereas unlike charges attract each other, In picture 3 they are like charges (both are positive) so, we can repulsion hence, picture is correct!

In picture 1, they are unlike charges, & showing repulsion which is wrong, same In picture 2, they are like charges & showing attraction so they are wrong as well

Hope this helps!

C is correct because they would repel each other A is wrong be they wouldn't repel And B is wrong because they shouldn't be repelling each other

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