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4 years ago

Why can friction make observing Newton's first law of motion difficult?

1 answer:

6 0

The law says things travel in a straight line at constant speed unless acted upon by a force. But friction is a force but it can't be seen easily other than its effect, which is to bring the object to rest in seeming violation of the 1st law.

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A system has 4 independent and identical motors, in order for the system to work, at least one of the motors must operate. Each

grin007 [14]

Answer:

The system's Mean Time to Failure is 1,041. $\bar 6$ hours

Explanation:

The number of independent identical motors = 4

The failure rate of each motor, λ = 0.002 failures per hour

Given that in order for the system to work, at least one of the motors must operate, therefore, the system are in parallel

The Mean Time to Failure for a parallel system of four identical components is given as follows;

$MTTF = \dfrac{1 }{\lambda} \times \left (1 + \dfrac{1}{2} + \dfrac{1}{3} + \dfrac{1}{4} \right)$

Which gives;

$MTTF = \dfrac{1 }{0.002} \times \left (1 + \dfrac{1}{2} + \dfrac{1}{3} + \dfrac{1}{4} \right) = 1,041.\bar 6$

The system's Mean Time to Failure = 1,041. $\bar 6$ hours.

8 0

3 years ago

Two planets are orbiting a star. Planet A is closer to the star than Planet B. Which description explains the expected motion of

77julia77 [94]

<span>Planet A orbits faster than Planet B, i believe is the answer. hope that helps

</span>

6 0

3 years ago

Read 2 more answers

Brainliest if correct Question 2 of 10

Troyanec [42]

Answer:

b and d

Explanation:

7 0

3 years ago

Is Mars a gas planet or a rocky planet?

OLEGan [10]

Mars is a rocky planet

8 0

3 years ago

Read 2 more answers

2. A boy lifts a 30N toy car 3 meters

GarryVolchara [31]

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 30 × 3

We have the final answer as

Hope this helps you

6 0

3 years ago