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3 years ago

Spidermans nemesis electro delivers 4kj of electrical energy in half a second how much power does it draw from the mains?

Physics

2 answers:

Olegator [25]3 years ago

5 0

Answer:

8 KW

Explanation:

Energy = 4 k J = 4000 J

t = 0.5 second

Power is defined as the rate of doing work.

Power = energy / time = 4000 / 0.5 = 8000 W = 8 KW

Elodia [21]3 years ago

4 0

Power delivered = (energy delivered) / (time to deliver the energy)

Power delivered = (4,000 J) / (0.5 sec)

Power delivered = 8,000 watts

I'm a little surprised to learn that Electro draws his power from the mains. This is VERY good news for Spiderman ! It means that Spiderman can always avoid tangling with Electro ... all he has to do is stay farther away from Electro than the length of Electro's extension cord.

But OK. Let's assume that Electro draws it all from the mains. Then inevitably, there must be some loss in Electro's conversion process, between the outlet and his fingertips (or wherever he shoots his bolts from).

The efficiency of Electro's internal process is

(power he shoots out) / (power he draws from the mains) .

So, if he delivers energy toward his target at the rate of 8,000 watts, he must draw power from the mains at the rate of

(8,000 watts) / (his internal efficiency) .

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It takes 15 min to drive 6.0 mi in a straight line to the local hospital. It takes 10 min to go the last 3.0 mi, 2.0 min to go t

Gala2k [10]

Answer:

36.87 km/h

Explanation:

Convert all the units in SI system

1 mile = 1609.34 m

d1 = 6 mi = 9656.04 m

t1 = 15 min = 15 x 60 = 900 s

d2 = 3 mi = 4828.02 m

t2 = 10 min = 10 x 60 = 600 s

d3 = 1 mi = 1609.34 m

t3 = 2 min = 2 x 60 = 120 s

d4 = 0.5 mi = 804.67 m

t4 = 0.5 min = 0.5 x 60 = 30 s

Total distance, d = d1 + d2 + d3 + d4

d = 9656.04 + 4828.02 + 1609.34 + 804.67 = 16898.07 m = 16.898 km

total time, t = t1 + t2 + t3 + t4

t = 900 + 600 + 120 + 30 = 1650 s = 0.4583 h

The ratio of the total distance covered to the total time taken is called average speed.

Average speed = 16.898 / 0.4583 = 36.87 km/h

6 0

3 years ago

a 72kg person is standing on a bathroom scale (calibrated in newtons). what is the reading of the scale when the acceleration is

Likurg_2 [28]

Answer:

F=ma

therefore A=F/M

Explanation:

i think that's what your doing but I'm not sure

4 0

3 years ago

The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation

Alexxx [7]

Answer: 8.6 µm

Explanation:

At a long distance from the source, the components (the electric and magnetic fields) of the electromagnetic waves, behave like plane waves, so the equation for the y component of the electric field obeys an equation like this one:

Ey =Emax cos (kx-ωt)

So, we can write the following equality:

ω= 2.2 1014 rad/sec

The angular frequency and the linear frequency are related as follows:

f = ω/ 2π= 2.2 1014 / 2π (rad/sec) / rad = 0.35 1014 1/sec

In an electromagnetic wave propagating through vacuum, the speed of the wave is just the speed of light, c.

The wavelength, speed and frequency, are related by this equation:

λ = c/f

λ = 3.108 m/s / 0.35. 1014 1/s = 8.6 µm.

7 0

3 years ago

14. Which type of heat transfer (caused by uneven heating) moves air and water around the earth and creates weather? Question 14

Katena32 [7]

Answer: convection

Explanation:

There are three ways in which the heat (thermal energy) transfer occurs:

1. By Conduction, when the transmission is by the direct contact.

2. By Convection, heat transfer in fluids (like water or the air, for example).

3. By Radiation, by the electromagnetic waves (they can travel through any medium and in vacumm)

In this especific case, we will talk about convection, which occurs when the hottest parts of a fluid ascend to the coldest zones, generating a continuous circulation of the fluid (better known as convective current) transmitting heat to the cold zones by decreasing the density caused by the increase in temperature.

This is what happens in Earth, when the convective heat transfer occurs, through the movement of groups of molecules that make up the medium (water and air in this situation) changing with temperature and creating the weather .

7 0

3 years ago

A 85.0 cm wire of mass 9.40 g is tied at both ends and adjusted to a tension of 39.0 N . When it is vibrating in its second over

kodGreya [7K]

Answer:

frequency = 104.80 Hz

wavelength = 0.567 m

frequency = 104.80 Hz

wavelength = 3.27 m

Explanation:

given data

mass m = 9.4 g = 9.4 × $10^{-3}$ m

length L = 85 cm = 0.85 m

tension T = 39 N

to find out

frequency and wavelength

solution

first we find frequency for second overtone

f = 3 /2L × √(T/μ) .............1

put here all value and

here μ = m/L = 9.4 × $10^{-3}$ / 0.85 = 1.10588 × $10^{-2}$ kg/m

f = 3 /2(0.85) × √(39/1.10588 × $10^{-2}$ )

f = 104.80 Hz

and

wavelength is 2L/3

wavelength = 2(0.85) / 3

wavelength = 0.567 m

and

frequency = 104.80 Hz

and

wavelength by speed of sound i.e 343 m/s

wavelength = speed / f

wavelength = 343 / 104.80

wavelength = 3.27 m

3 0

4 years ago