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xxTIMURxx [149]
3 years ago
13

The potential energy of a spring is a. inversely proportional to the square of the amount b. the spring that is stretched from i

ts equilibrium length. c. proportional to the square of the amount the spring that is stretched from its equilibrium length. d. proportional to the amount the spring that is stretched from its equilibrium length.
Physics
1 answer:
Scorpion4ik [409]3 years ago
4 0

Answer:

c) proportional to the square of the amount the spring that is stretched from its equilibrium length

Explanation:

according to Hooke's law, the elastic potential energy of a spring is:

U_e=\frac{1}{2}*k*x^2

where:

K is the spring constant

x is the distance that the spring's is compressed.

as you can notice the distance is squared, so the energy is proportional to the square of the compressed distance.

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Advocard [28]

Answer:

a) F = 2250 Ib

b) F = 550 Ib

c) new max force ( F newmax ) = 2850 Ib

Explanation:

A) The force the wall of the elevator shaft exert on the motor if the elevator starts from rest and goes up

max capacity  of elevator = 24000 Ibs

counterweight = 1000 Ibs

To calculate the force (F) :

we first calculate the Tension using this relationship

Counterweight (1000) - T =  ( 1000 / g ) ( g/4 )

Hence T = 750 Ib

next determine F

750 + F - 2400 = 2400 / 4

hence F = 2250 Ib

B ) calculate Tension first

T - 1000 = ( 1000/g ) ( g/4)

T = 1250 Ib

F = 2400 -1250 - 2400/ 4

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Max = 2400 * 1.2 = 2880 Ib

750 + new force - 2880 = 2880 / 4

new max force ( F newmax ) = 2850 Ib

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3 years ago
You throw a bouncy rubber ball and a wet lump of clay, both of mass m, at a wall. Both strike the wall at speed v, but while the
lana [24]

Answer:

<em>The fifth option is the correct answer: mv; 2 mv</em>

Explanation:

<u>Change of Momentum</u>

Assume an object has a momentum p1 and after some interaction it now has a momentum p2, the change of momentum is

\Delta p=p_2-p_1

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Where m is the mass of the object and v its speed. Now let's analyze the situation of both the ball and the clay.

The clay has an initial speed v and a mass m, thus its initial momentum is

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\Delta p=0-mv=-mv

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Now for the ball, the initial condition is the same as it was for the clay, but the ball hits back at the same speed, thus its final momentum is

p_2=-mv

The change of momentum is

\Delta p=-mv-mv=-2mv

The absolute change is 2mv

The fifth option is the correct answer: mv; 2 mv

3 0
3 years ago
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Artyom0805 [142]
<span>the difference of electrical potential between two points. hope this helps</span>
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2. Categorize each statement as true or false. A cylindrical capacitor is essentially a parallel-plate capacitor rolled into a t
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Answer:

Explanation:

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