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3 years ago

Compare an earthquake with a Richter scale magnitude of 5.5 to one with a magnitude of 7.5.

1 answer:

7 0

The 7.5 is a 100 times stronger than the 5.5 . The 100 comes from the increase in scale from 5.5 to 7.5 which is an increase of two so you multiply the strength of the weaker earthquake 10^7-5=10^2=100 and that gives you the strength of the stronger earthquake!

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Scarcity is not usually a problem in economics true or false

PSYCHO15rus [73]

False because the allocation rule of "first come-first served" promotes productive cooperation.

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3 years ago

Read 2 more answers

A wheel has a constant angular acceleration of 1.8 rad/s2. During a certain 4.0 s interval, it turns through an angle of 45 rad.

tankabanditka [31]

Answer:

4.25 s

Explanation:

Given:

angular acceleration'α'= 1.8 rad/s²

angle 'θ'= 45 rad

time 't'= 4s

initial angular velocity ' $w_{o}$ '=0 $rad^{-1}$

as we know that,

θ= $w_{1}$ t + $\frac{1}{2} \alpha t^{2}$

45 = 4 $w_{1}$ + (0.5 x 1.8 x 16)

45- 14.4 = 4 $w_{1}$

30.6 = 4 $w_{1}$

$w_{1}$ = 7.65 $rad^{-1}$

Next is to find t by using the equation

$w_{1}$ = $w_{o}$ + $\alpha t_{1}$

7.65= 0 + (1.8) $t_{1}$

$t_{1}$ = 7.65/1.8

$t_{1}$ = 4.25 s

Therefore, At the start of 4s interval the motion is at 4.25 second

7 0

3 years ago

14. Which of the following is not an example of work being done?

Natali5045456 [20]

Answer:

B. holding a coffee mug

Explanation:

Something must move a distance for work to be done.

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3 years ago

The 3670-lb car is traveling at 25 mi/hr when the driver applies the brakes, and the car continues to move along the circular pa

Monica [59]

Answer:

$a_t = -14.37407175$

Explanation:

I was unable to submit this answer after typing it, so i create a document file that clearly shows and depicts all explanations for the question. OR

You can check the three picture slides i attached as well for the explanation.

The attached file for the document and the picture can be found below.

Download docx

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3 years ago

On may 26, 1934, a streamlined, stainless steel diesel train called the zephyr set the world’s nonstop long-distance speed recor

dimaraw [331]

First we can calculate the average speed v in km/h by the equation v=s/t where s is the distance traveled and t is the time:

First we turn time into seconds and divide by 3600 to get time t in hours is:

t=13*3600 s + 4*60 s + 58 s= 47098 s and that is:

t=47098s/3600s=13.08278 hours

So v=1633.8/13.08278=124.88 km/h

To get speed in m/s we simply turn kilometers into meters and hours into seconds:

s=1633.8 km *1000 = 1633800 m

t=13*3600s + 4*60 s + 58 s=46800 s + 240 s + 58 s=47098 s

v=s/t=1633800/47098=34.67 m/s

So average speed in km/h is v=124.88 km/h and in m/s is v= 34.67 m/s.

8 0

3 years ago