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Afina-wow [57]
3 years ago
5

A rock is dropped off a cliff and falls the first half of the distance to the ground in t1 seconds. If it falls the second half

of the distance in t2 seconds, what is the value of t2/t1? (Ignore air resistance.)
Physics
1 answer:
Hitman42 [59]3 years ago
5 0

Answer:

t2/t1 = \sqrt{2} - 1

Explanation:

The expression for the second law of motion is given below:

h = ut + 0.5at^2

<u>For first half distance</u>

Object is initially at rest, so its initial speed u = 0

Object falls at half the distance, so h = h/2 where t = t1

Hence, we have

h/2 = at1^2/2 - equation 1

<u>For second half distance: </u>

Similarly,

h = a(t1 + t2)^2/2 - equation 2 where t = t1 + t2 and u= 0

Using equation 2 by equation 1

we obtain 2 = (t1 + t2)^2/t1^2

Hence t2/t1 + 1 = \sqrt{2}

Hence t2/t1 = \sqrt{2} - 1

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A 20 kg girl runs up the staircase to a floor 4 m higher in 5 seconds. Whats her power output?​
Zina [86]

Answer:

Explanation:

P = mgh/t = 20(9.8)(4) / 5 = 156.8 W(atts)

6 0
2 years ago
QuestIuI
WARRIOR [948]

Given Information:

Mass of elephant = m = 750 kg

Height = h = 14.3 m  

time = t = 30 seconds

Required Information:

Power needed to lift elephant = P = ?

Answer:

Power needed to lift elephant ≈ 3507 watts

Explanation:

As we know power is given by

P = PE/t

Where PE is the potential energy and t is the time

Potential energy is given by

PE = mgh

Where m is the mass of elephant, g is the gravitational acceleration and h is the height to lift the elephant.

PE = 750*9.81*14.3

PE = 105212.25 Joules

Therefore, the required power to lift the elephant is

P = PE/t

P = 105212.25/30

P ≈ 3507 watts

8 0
4 years ago
A sample of oxygen gas at 25.0°c has its pressure tripled while its volume is halved. What is the final temperature of the gas?
Marat540 [252]

Answer:

447 K

Explanation:

25 C = 25 + 273 = 298 K

Assuming ideal gas, we can apply the ideal gas law

\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}

T_2 = T_1\frac{P_2}{P_1}\frac{V_2}{V_1}

Since pressure is tripled, then P_2 / P_1 = 3. Volume is halved, then V_2 / V_1 = 0.5

T_2 = 298*3*0.5 = 447 K

4 0
3 years ago
Read 2 more answers
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