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tatuchka [14]
3 years ago
10

Does fire use energy??

Physics
1 answer:
serious [3.7K]3 years ago
6 0
No fire uses oxygen sparks and flammable wood or whatever you choose to burn
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What is the period of a simple pendulum 47 cm long (a) on the Earth, and ( b) when it is in a freely falling elevator?
Liula [17]

Answer:

a)1.37 s

b)∞ ( Infinite)

Explanation:

Given that

L= 47 cm              ( 1 m =100 cm)

L= 0.47 m

a)

On the earth :

Acceleration due to gravity = g

We know that time period of the simple pendulum given as

T=2\pi\sqrt{ \dfrac{L}{g_{{eff}}}

Here

g_{eff}= g

Now by putting the values

T=2\pi \times\sqrt{ \dfrac{0.47}{9.81}}

T=1.37 s

b)

Free falling elevator :

When elevator is falling freely then

g_{eff}= 0            ( This is case of weightless motion)

Therefore

T=2\pi\sqrt{ \dfrac{L}{0}

T=∞  (Infinite)

6 0
3 years ago
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
emmasim [6.3K]

2+.5 + 2.5 all over 3

5/3

1.67k/h





=2.5

4 0
3 years ago
Read 2 more answers
David lifts a book 1.2 meters from the floor to the top of his desk. If the book weighed 0.50 kg, what is the gravitational pote
Anika [276]

Answer:

5.886 J

Explanation:

Given:

The mass of the book is, m=0.5 kg

Height of lift is, \Delta h=1.2 m

Acceleration due to gravity is, g=9.81 m/s²

Now, gain in gravitational potential energy is a function of change in position and is given as:

\Delta PE=mg\Delta h

Here, \Delta PE is the change in gravitational potential energy.

Plug in 0.5 kg for m, 9.81 for g and 1.2 for \Delta h. Solve for \Delta PE

\Delta PE=0.50\times 9.81\times 1.2=5.886\ J

Therefore, the gain in gravitational energy of the book is 5.886 J.

7 0
3 years ago
10.A car moving at 18 m/s accelerates at -2.5 m/s² as it approaches a stop sign.
Tatiana [17]

Answer:

Explanation:the time taken to stop is 7seconds

The distance traveled by the car as it breaks is 63m

8 0
3 years ago
A 1 kg ball is hung at the end of a rod 1 m long. If the system balances at a point on the rod one third of the distance from th
Anarel [89]

Answer:

2 kg

Explanation:

Assuming the rod's mass is uniformly distributed, the center of mass is at half the length.

Sum of the moments at the balance point:

-(Mg)(L/3) + (mg)(L/2 − L/3) = 0

(Mg)(L/3) = (mg)(L/2 − L/3)

(Mg)(L/3) = (mg)(L/6)

2M = m

M = 1 kg, so m = 2 kg.

The mass of the rod is 2 kg.

8 0
3 years ago
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