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4 years ago

Can someone help me?

Physics

2 answers:

stepladder [879]4 years ago

8 0

T=0-15.5/-0.392
=39.5m/s

otez555 [7]4 years ago

4 0

Given:
acceleration a = -0.392 m/s²
initial velocity v = 15.5 m/s
final velocity = v = 0 m/s

Unknown:
time t

Using the same equation:
$t = \frac{final (v) - initial(v)}{acceleration (a)} = \frac{0 \frac{m}{s} - 15.5 \frac{m}{s}}{-0.392 \frac{m}{s^2} } = \frac{-15.5 \frac{m}{s} }{-0.392 \frac{m}{s^2} } = 39.5 s$

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stiks02 [169]

Answer:

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Explanation:

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3 years ago

A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of th

Blababa [14]

Efficiency = (Wanted) energy out ÷ energy in × 100

Energy in = 400J
Wanted Energy out = 240J

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Efficiency = 240 ÷ 400 × 100
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3 years ago

The wheelchair starts from rest. It accelerates at a constant rate until it has a speed of 1.5 m/s. The wheelchair travels a dis

anastassius [24]

<h2>Answer:-</h2>

$\pink{\bigstar}$ The acceleration of the wheelchair is $\large\leadsto\boxed{\tt\purple{0.5625 \: m/s^2}}$

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<h3>• Given:-</h3>

Initial velocity of the wheelchair = 0 m/s

Final velocity of the wheelchair = 1.5 m/s

Distance covered by the wheelchair = 2 m

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Acceleration of the wheelchair = ?

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<h3>• Solution:-</h3>

We know,

• Third Equation of Motion:-

$\pink{\bigstar}$ $\large\underline{\boxed{\bf\green{v^2 - u^2 = 2as}}}$

where,

u = Initial velocity

v = Final velocity

a = Acceleration

s = Distance covered

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• Substituting the values in the Formula:-

➪ $\sf (1.5)^2 - (0)^2 = 2 \times a \times 2$

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➪ $\sf 2.25 - 0 = 4 \times a$

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➪ $\sf 2.25 = 4 \times a$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

➪ $\sf a = \dfrac{2.25}{4}$

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★ $\large{\bold\red{a = 0.5625 \: m/s^2}}$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

Therefore, the acceleration of the wheelchair is 0.5625 m/s².

7 0

3 years ago

What is the wavelength of a radio photon from an "am" radio station that broadcasts at 1280 kilohertz?

joja [24]

The wavelength of the given wave is calculated through the equation,
λ = c/v
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c is the speed of light, equal to 3x10⁸ m/s, and
v is the frequency

Then, we substitute the known values to the equation,
λ = (3 x 10⁸ m/s)/(1280 x 10³/s)
λ = 234.375 m

The wavelength of the "am" radio station is 234.38 m.

3 0

4 years ago

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Andrew [12]

Answer:

0 m/s

Explanation:

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no movement = no speed or distance, and without anything to calculate your answer has to be zero

7 0

3 years ago