Answer: Choice A) 0.44 miles
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Work Shown:
1 hour = 60 minutes
1 minute = 60 seconds
1 hour = 60*60 = 3600 seconds
40 seconds = 40*(1/3600) = 40/3600 = 1/90 hours
The car travels 1/90 of an hour. Let t = 1/90.
The initial velocity is vi = 30 mph.
The final velocity is vf = 50 mph.
Apply one of the kinematics equations as given below.
x = distance traveled
x = 0.5*(vi+vf)*t
x = 0.5*(30+50)*(1/90)
x = 0.44444444444444 which is approximate
x = 0.44
The car traveled roughly 0.44 miles. This matches with choice A.
I'm assuming choice A is supposed to say 0.44 instead of 0.442; otherwise, I think your teacher made a typo by putting that 2 in there. Each of the other answer choices are accurate to 2 decimal places, so it would make sense that choice A is also accurate to 2 decimal places as well.
If 0.442 was intended by your teacher, and it's not a typo, then the answer would be E) None of the choices given.
Answer:
bust
Explanation:
At the same speed, kinetic energy is proportional to mass. The more massive object (the large bust) will have more kinetic energy.
Answer:
100 m/s
Explanation:
SI units of distance and time are <em>meters</em> and <em>seconds</em>. km and hours are derived units. To express speed in SI units, it must be expressed as <em>meters per second</em>.
360 km/h = 100 m/s
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There are 3600 seconds in 1 hour, so 1 m/s = 3600 m/h = 3.6 km/h.
Answer:
D.
Explanation:
uranium is a renewable resource
The total work is
(mass of the elevator, kg) x (9.8 m/s²) x (9.0 m) Joules .