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natali 33 [55]
4 years ago
9

Need an answer asap please!

Physics
1 answer:
olya-2409 [2.1K]4 years ago
7 0

Answer:

Z

Explanation:

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Suppose you have a pendulum clock that keeps correct time on Earth (acceleration due to
vekshin1

Answer:

dont know because I am a student lol

8 0
3 years ago
Read 2 more answers
A flux density of 1.2Wb/m^2 is required in the 1 mm air gap of an electromagnet having an iron path of length 1.5 m. Calculate t
Mandarinka [93]

Answer:

The mmf required is 1.125×10^{-3} A

Explanation:

The Magnetomotive force (mmf) is given by the formula below

F_{M} = Hl\\

where F_{M} is the Magnetomotive force (mmf)

H is the Magnetic field strength

l is the magnetic length

The magnetic permeability μ is given by

μ = B / H

Where B is the Magnetic flux density

and H is the Magnetic field strength

From the question,

B = 1.2Wb/m^2

μ = 1600m

From μ = B / H

∴H = B/μ

H = 1.2 / 1600\\

H = 7.5 × 10^{-4}A/m

Now, for the Magnetomotive force (mmf)

F_{M} = Hl\\

From the question

l = 1.5 m

∴ F_{M} = 7.5×10^{-4} × 1.5

F_{M} = 1.125×10^{-3} A

Hence, The mmf required is 1.125×10^{-3} A

3 0
3 years ago
HELP PLZ
Stells [14]

Answer:

Explanation:

Use the equation

h(t)=-16t^2+v_0t+h_0

where h(t) is the height after a certain amount of time goes by, v0t is the initial upwards velocity, and h0 is the initial height of the projectile. For us:

h(t) = 10

v0t = 80

h0 = 3 and filling in:

10=-16t^2+80t+3 and get everything on one side to factor:

0=-16t^2+80t-7

This factors to

t = .09 sec and 4.9 sec. Let's interpret this.

The time of .09 is when the ball reached 10 feet on the way up, and

the time of 4.9 is when the ball reached 10 feet on the way back down. That's the height we need, 4.9 seconds.

5 0
3 years ago
The weightlifter's internal store of energy decreased when he lifted the bar.
Mumz [18]

Answer:

The energy returns to the weightlifter's muscles, where it is dissipated as heat.

Explanation:

The energy returns to the weightlifter's muscles, where it is dissipated as heat. As long as the weightlifter controls the weight's descent, their muscles are acting as an overdamped shock absorber, as if the weight were sitting on a piston containing very thick fluid, slowly compressing it downward (and slightly heating up the fluid in the process). Since muscles are complicated biological systems and not simple pistons, they require metabolic energy to maintain tension throughout the controlled descent, so the weightlifter feels like they're putting energy into the weight, even though the weight's gravitational potential energy is being converted into heat within the lifter's muscles.

5 0
3 years ago
Compare the de Broglie wavelength of an electron moving at 1.30×107 miles per hour (5.81×106 m/s) to that of a bullet moving at
lesya [120]

Answer:

electron  λ = 12.5 nm , bullet  λ = 1.11 10⁻³³ m  and golf ball  λ = 4.7 10⁻³⁴ m

Explanation:

The Broglie wave duality principle states that all matter has wave and particle properties, it is expressed by the equation

      p = h / λ

Where lam is called broglie wavelength

Let's use the definition of momentum

       p = mv

Let's calculate the wavelengths

-Electron

     mv = h /λ

     λ = h / mv

     λ = 6.63 10⁻³⁴ / (9.1 10⁻³¹ 5.81 10⁶)  

     λ = 1.25 10⁻¹⁰ m

     λ = 12.5 nm

This is the X-ray region

-bullet

     λ = 6.63 10⁻³⁴ / (1.90 10⁻³  313)

     λ = 1.11 10⁻³³ m

It is too small, only particle characteristics are observed

-Golf ball

     λ = 6.63 10⁻³⁴ / (4.50 10⁻² 31.3)

    λ = 4.7 10⁻³⁴ m

Too small, only particle characteristics are visible

7 0
3 years ago
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