3 years ago

What is the wavelength of an earthquake wave if it has a speed of 13 km/s and a frequency of 5 Hz?

1 answer:

6 0

To find the wavelength you divide the wave speed over the frequency. This would be 13/5. The quotient would be 2.4. This means the wavelength is 2,.4 meters or whatever your unit is.

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Anne pushed a cart by 12 N. How far did the cart move if the work done was 9 J?

telo118 [61]

Force=12N
Work=9J

$\\ \sf\longmapsto W=Fd$

$\\ \sf\longmapsto d=\dfrac{W}{F}$

$\\ \sf\longmapsto d=\dfrac{9}{12}=0.72m$

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2 years ago

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When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change?

vredina [299]

Answer:

gravitational energy

Explanation:

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2 years ago

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11. You want to calculate the displacement of an object thrown over a bridge. Using -10 m/s2 for acceleration due to gravity, wh

Natalka [10]

Displacement is d

Vf² = Vi² + 2 g d

(-20²) = (+10²) + 2 (-9.8) d

-19.6 d = 300

d = -15.3 m

negative means lower

time is t

d = Vi t + 1/2 g t²

-15.3 = 10 t + (-4.9) t²

4.9 t² - 10 t -15.3 = 0

t = 3.06 s

3 0

3 years ago

You could use newton’s second law to calculate the force applied to an object if you knew the objects mass and its _____.

olga2289 [7]

Answer:

You could use newton’s second law to calculate the force applied to an object if you knew the objects mass and its <u>acceleration.</u>

Explanation:

By, Newtons second law, the force applied on an object directly varies with the acceleration caused and the mass of the object.

This is given by :

$F=m\ a$

Where $F$ represents force applied on the object , $m$ represents mass of the object and $a$ represents the acceleration.

In order to calculate force applied on object we require the mass of the object and its acceleration. The force can be calculated by finding the product of mass and acceleration of the object.

4 0

3 years ago

a 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. what is its potential energy (PE) when it is 2.00 m above the grou

zmey [24]

Answer:

1.56 J

Explanation:

The potential energy only depends on the vertical height from the ground level.

We consider the ground level to have zero P.E.

So when it is 2 m above the ground level,

P.E. = mgh

= 0.078×10×2

= 1.56 J

7 0

3 years ago