An ocean-going barge is 50.0 m long and 20.0 m wide and has a mass of 145 metric ton. Will the barge clear a reef 1.50 m below t

The cyclist accelerates for 4 seconds.

Explanation:

The motion of the cyclist is a motion at constant acceleration, so we can use suvat equations:

where

s = 64 m is the distance covered

u = 15 m/s is the initial velocity

t is the time

is the acceleration

Substituting into the equation,

Solving the equation for t,

Which gives two solution: one is negative, so we discarde it since it has no physical meaning; the other one is

t = 4 s

which is the answer we were looking for.

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Answer:

The last significant figure is inherently uncertain because of the rounding off. The rounding-off uncertainty is usually half of the last figure's decimal-place value if no other uncertainty is expressed. As a rule of thumb results of measurements and calculations have a limited number of significant figures.

Answer:

100 mph, or about 44.7 m/s

Explanation:

Average speed is .

After substitution, this is .

The average speed, therefore, reduces to 100 mph, or about 44.7 m/s.

Answer: 6m/s2

Explanation: Recall, F =ma

a =F/m

Where a = 4m/s2

So, 4 =F/m .............. equation ( 1)

Now we shall see the value of a where 3F and 2m

Thus,

a =F/m

a = 3F/2m

a =3/2 ×F/m ............... equation ( 2 )

Now, substitute equation 1 into 2

F/m = 4

a =3/2 ×4

a = 12/2

a = 6m/s2

Answer:

A. a laser system developed by NASA to help spaceship dock with space stations was later adapted to help doctors perform eye surgery.

Explanation:

Option A is correct because it is the statement that describes an unanticipated impact of a technological advance.

The laser system used in spaceship has been discovered to be useful during eye surgeries. In astronaut, the eye tracking device is used to used to track the eyes without interfering with the work of the astronaut. Also, it now became useful in surgery in tracking the position of the eye without interfering with the surgeon's work.