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nlexa [21]
3 years ago
9

As a marble rolls across the floor, it gradually slows to a stop due to friction. Which statement best describes the change in m

echanical energy of this system?
a.) Mechanical energy was transferred from the floor to the marble.

b.) Mechanical energy was transferred from the marble to the floor.

c.) The total energy of the marble and floor, including the mechanical energy, was reduced to zero.

d.) The mechanical energy of the marble was transformed into nonmechanical energy.
Physics
1 answer:
Olegator [25]3 years ago
3 0

Answer:

I belive it would be "C"

Explanation:

If it was any of the other answers "B" it would instantly stop. "A" it would roll forever.

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A grandfather clock is controlled by a swinging brass pendulum that is 1.2 m long at a temperature of 27°C. (a) What is the leng
stealth61 [152]

Answer:

L2 = 1.1994 m

the length of the pendulum rod when the temperature drops to 0.0°C is 1.1994 m

Explanation:

Given;

Initial length L1 = 1.2m

Initial temperature T1 = 27°C

Final temperature T2 = 0.0°C

Linear expansion coefficient of brass x = 1.9 × 10^-5 /°C

The change i length ∆L;

∆L = L2 - L1

L2 = L1 + ∆L ...........1

∆L = xL1(∆T)

∆L = xL1(T2 - T1) ......2

Substituting the given values into equation 2;

∆L = 1.9 × 10^-5 /°C × 1.2m × (0 - 27)

∆L = 1.9 × 10^-5 /°C × 1.2m × (- 27)

∆L = -6.156 × 10^-4 m

From equation 1;

L2 = L1 + ∆L

Substituting the values;

L2 = 1.2 m + (- 6.156 × 10^-4 m)

L2 = 1.2 m - 6.156 × 10^-4 m

L2 = 1.1993844 m

L2 = 1.1994 m

the length of the pendulum rod when the temperature drops to 0.0°C is 1.1994 m

3 0
3 years ago
The concentration of sodium and potassium ions in the blood and body fluid is regulated by :
Liula [17]

Answer:

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Kidney function for reabsorption and secretion, in which reabsorption of Na is done nd balances the sodium and potassium in the blood and body.

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Changes in the way atoms are ? together occur when compounds form
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I think it's bigger than most galaxies

3 0
2 years ago
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What is the dimensional formula of torque and force ​
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✿━━━━@♥ℳg━━━━✿

<h2>\boxed{Explained\:Answer}</h2>

______________________________

✿━━━━@♥ℳg━━━━✿

Torque = Force X Displacement

= MLT-2 X L = [M1L2T-2]

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6 0
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