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3 years ago

The main difference between the Richter scale and the Mercalli intensity scale is _____.

2 answers:

7 0

C.) -the Richter measures the energy released from an earthquake while the Mercalli measures the effects of an earthquake

Rus_ich [418]3 years ago

3 0

<span>The Richter measures multiple sources of energy being released while the Mercalli measures energy released from the epicenter or focus.</span>

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A 1 170.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 800.0 kg t

Stella [2.4K]

Answer:

Explanation:

mass of car, m1 = 1170 kg

mass of truck, m2 = 9800 kg

initial velocity of car, u1 = 25 m/s

initial velocity of truck, u2 = 20 m/s

final velocity of car, v1 = 18 m/s

Let the final velocity of truck is v2.

(a) Use the conservation of momentum

m1 x u1 + m2 x u2 + m1 x v1 + m2 x v2

1170 x 25 + 9800 x 20 = 1170 x 18 + 9800 x v2

29250 + 196000 = 21060 + 9800 v2

v2 = 20.84 m/s

(b) Total kinetic energy before collision,

Ki = 0.5 x 1170 x 25 x 25 + 0.5 x 9800 x 20 x 20

Ki = 365625 + 1960000 = 2325625 J

Total final kinetic energy

Kf = 0.5 x 1170 x 18 x 18 + 0.5 x 9800 x 20.84 x 20.84

Kf = 189540 + 2128097.44

Kf = 2317637.44 J

Change in energy = 2325625 - 2317637.44 = 7987.56 J

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4 years ago

A ball whose mass is 1.9 kg is suspended from a spring whose stiffness is 8.0 N/m. The ball oscillates up and down with an ampli

MArishka [77]

Answer:

2.05 radians/s

Explanation:

This is a simple harmonic motion. The angular frequency of a loaded spring is given by

$\omega = \sqrt{\dfrac{k}{m}}$

where $k$ is the spring constant and $m$ is the mass on the spring.

Using the known values,

$\omega = \sqrt{\dfrac{8}{1.9}} = 2.05$

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3 years ago