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4 years ago

8. The acceleration of an object is zero. Which best describes the possible motion of the object?

Physics

1 answer:

Assoli18 [71]4 years ago

6 0

<h3>Answer</h3>

The object is at rest or is traveling at constant velocity.

<h3>Explanation</h3>

Acceleration is rate of change of velocity and velocity is a vector quantity which means that it is speed with direction.

If acceleration is zero it means that velocity is constant.

Constant velocity may include zero velocity or "at rest"

and

Speed is zero or speed is constant and no change in direction

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3 years ago

what is the energy (in eV units) carried by one photon violet light that has a wavelength of 4.5e-7?

DaniilM [7]

The energy of a photon is given by
$E=hf$
where h is the Planck constant and f is the photon frequency.

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$f= \frac{c}{\lambda}$
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$f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{4.5 \cdot 10^{-7} m}=6.67 \cdot 10^{14}Hz$

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We know that 1 Joule corresponds to
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4 years ago

A marble is thrown horizontally with a speed of 7 m/s. When the marble lands, it hastraveled a horizontal displacement of 30 m.

Alex Ar [27]

Answer:

t = 4.28 s

Explanation:

The horizontal speed of a marble = 7 m/s

The horizontal displacement covered by the marble = 30 m

We need to find the time for which the marble is in air. Let the time is t. Using the formula for speed to find it as follows :

$s=\dfrac{d}{t}\\\\t=\dfrac{d}{s}\\\\t=\dfrac{30\ m}{7\ m/s}\\\\=4.28\ s$

So, it will in the air for 4.28 s.

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3 years ago

What happens when you push a spring? How is this different than pulling it? (Hooke’s Law)

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3 years ago

Read 2 more answers

A man with his eye level 6 feet above the ground is standing 3 feet away from the base of a 15-foot vertical ladder. If he looks

DochEvi [55]

Answer:

71.6°

Explanation:

According to the diagram

ED = 6 feet

DA = EB = 3 feet

AC = 15 feet

AB = ED = 6 feet

BC = AC - AB = 15 - 6 = 9 feet

Let the angle is θ from the horizontal

By the triangle EBC

tanθ = BC / EB = 9 / 3

tanθ = 3

θ = 71.6°

Thus, the angle from the horizontal is 71.6°.

Explanation:

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4 years ago