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3 years ago

I’m super stuck.

Physics

1 answer:

Mkey [24]3 years ago

4 0

The voltage all the way around the loop ... between the terminals of the battery ... is 36 volts total. It looks like 12 of those volts are across one lamp, and 12 of them are across the other lamp. That leaves the last 12 volts unaccounted for, and only one more component in the loop (the resistor), so the remaining 12 volts is across the resistor.

So far, we don't have enough information to calculate any current in the loop, or the power dissipated by any component. To go any farther, we'll need to take your word for it ... the current in the loop is 0.75 Ampere. Fine !

In a resistor . . . Resistance = (voltage) / (current)

Resistance = (12 volts) / (0.75 Amp) = 16 ohms .

Power dissipated by anything = (voltage across it) x (current through it).

Power dissipated by the resistor OR either lamp =

(12 volts) x (0.75 Amp) = 9 watts .

That's not a lot for a light bulb, but it IS for a resistor. That baby has to be physically large (maybe like a lipstick), and cooled ... attached to a heatsink, or air blowing over it, or water flowing over it.

PS: I hope you're right about that 0.75 Amp.

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Light does not move infinitely fast but has a finite speed. We normally use ""c"" to indicate the speed of light in science. Wri

Ede4ka [16]

Answer:

6.71 × 10^8 mi/hr

Explanation:

Light is usually defined as an electromagnetic wave that is comprised of a definite wavelength. It is of both types, visible and invisible. The light emitted from a source usually travels at a speed of about 3 × 10^8 meter/sec. This speed of light is commonly represented by the letter 'C'.

To write it in the metric system, it has to be converted into miles/hour.

We know that,

1 minute = 60 seconds

60 minutes = 1 hour

1 kilometer = 1000 meter

1 miles = 1.6 kilometer

Now,

= $\frac{3 \times\ 10^8 meter \times\ 60 sec \times\ 60 min}{1 sec \times\ 1 min \times\ 1 hr}$

= 1.08 × 10^12 m/ hr (meter/hour)

= $\frac{1.08 \times\ 10^{12} meter \times\ 1 km \times\ 1 miles}{1 hr \times\ 1000 meter \times\ 1.6 km}$

= 6.71 × 10^8 mi/hr (miles/hour)

Thus, the value for speed of light (C) in metric unit is 6.71 × 10^8 mi/hr.

5 0

3 years ago

Explain why earth's gravity pulls you toward the ground

pogonyaev

Answer:

Earth's gravity comes from all its mass. All its mass makes a consolidated gravitational draw on all the mass in your body.

Explanation:

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3 years ago

The emission of light from a radioisotope occurs during ? decay.

jeka94

Answer:

Gamma

Explanation:

7 0

3 years ago

Read 2 more answers

A force that varies with time is applied to an object. The force increases linearly from zero to twenty-four newtons during the

harkovskaia [24]

Answer:

144Ns

Explanation:

Impulse is the product of force and change in time or a measure of the change in momentum. Mathematically, Impulse is given as

J = FΔt

Where

J = Impulse,

F = Force,

Δt = change in time.

Due to the varying force, we know that the impulse varies at different points in the motion. Hence, the Net Impulse will be the addition of the individual impulses, i.e.

J = ΣJᵢ

J = J₁ + J₂ + J₃

J = F₁Δt₁ + F₂Δt₂ + F₃Δt₃

=> J = (24*2) + (24*4) + (0*2)

J = 48 + 96 + 0

J = 144 Ns

4 0

3 years ago

Starting from rest, a wheel with constant angular acceleration turns through an angle of 25 rad in a time t. What will its angul

alexandr402 [8]

Answer:

θ = 225 rad

Explanation:

given data

angle = 25 rad

to find out

angular velocity after 3t?

solution

let angular acceleration α in t

θ = ω × t + 0.5 × α × t² ........................1

here ω = 0 (initial velocity )

so put this value here

25 = 0 + 0.5 × α × t² ..........................2

α = 25 ÷ (0.5 t²)

α = 50 ÷ t² .........................3

now here we take in 3t

θ = ω × 3t + 0.5 × α × (3t)²

for ω = 0

θ = 0 + 0.5 × α × 9t²

now put value in eq 2

θ = (0.5) × (50 ÷ t²) × (3t)²

θ = 25 × 9

θ = 225 rad

6 0

3 years ago