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Alika [10]
3 years ago
5

An elevator is initially moving upward at a speed of 12.00 m/s. the elevator experiences a constant downward acceleration of mag

nitude 4.00 m/s2 for 3.00 s. (a) find the magnitude and direction of the elevator’s final velocity. (b) how far did it move during the 3.00 s interval?
Physics
1 answer:
harina [27]3 years ago
8 0
The two equations used in this problem is from the derived equations of rectilinear motion at a constant acceleration. 

a = (v - v₀)/t
2ax = v² - v₀²
where
a is the acceleration
x is the distance 
v is the final velocity
v₀ is the initial velocity
t is the time

Part a.) The acceleration is negative because it is moving downward: a = -4 m/s². The initial velocity is v₀ = 12 m/s and t is 3 s.

-4 = (v - 12)/3
v = 0 m/s
Thus, after 3 seconds the elevator comes to a stop.

Part b.) 

2(-4)x = 0² - 12²
x = 18 m
The elevator has traveled a distance of 18 m within 3 seconds.
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The de Broglie wavelength \lambda = 4.0\times 10^{-30}m

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1 year ago
A block of mass, m, sits on the ground. A student pulls up on
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Answer a

Explanation: a

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3 years ago
One differnce between magnetic poles and elcyrical charges is that​
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In the electric field, the like charges repel each other, and the unlike charges attract each other, whereas in a magnetic field the like poles repel each other and the unlike poles attract each other.

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3 years ago
A river flows with a speed of 0.600 m/s. A student first swims upriver 0.500 km, then turns around and returns to his starting p
DerKrebs [107]

Answer:

a) 1111.0 seconds

b) 833.3 s

c) Because of proportions

Explanation:

a) Total time of round trip is the sum of time upriver and time downriver

t_{total}=t_{up}+t_{down}

Time upriver is calculated with the net speed of student and 0.500 km:

t_{up}=\frac{d_{istance}}{|v_{swimmer}|} ;\\v_{swimmer}=v_{relative to river}+v_{river}=-1.2+0.6=-0.6 m/s\\t_{up}=\frac{500 m}{0.6 m/s}=833.3 s

(Becareful with units 0.5 km= 500m) Similarly of downriver:

t_{down}=\frac{d_{istance}}{|v_{swimmer}|} ;\\v_{swimmer}=1.2+0.6=1.8 m/s\\t_{down}=\frac{500 m}{1.8 m/s}=277.7 s

So the sum is:

t_{total}=1111.0s

b) Still water does not affect student speed, so total time would be simply:

t_{total}=\frac{1000 m}{1.2 m/s}=833.3 s

c) For the upriver trip, student moved half the distance in half speed of the calculation in b), so it kept the same ratio and therefore, same time. So the aditional time is actually the downriver.  

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3 years ago
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