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creativ13 [48]
3 years ago
13

Help me, i don't know the answer ​

Physics
1 answer:
8_murik_8 [283]3 years ago
4 0

Explanation:

1)

A) Bb BB

B) 50%

2)

A) 50%

B) <u> </u><u> </u><u> </u><u> </u><u> </u><u>b</u><u>.</u><u> </u><u> </u><u> </u><u>b</u>

B. Bb. Bb

b. bb. bb

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You need to know the height of a tower, butdarkness obscures the ceiling. You note thata pendulum extending from the ceiling alm
AysviL [449]

Answer:

The towers height is 322m  

Explanation:

We can assume that a simple pendulum hangs from the top of the tower.  

In this case, the length of the pendulum will be the same as the height of the tower.

We will use the next expression then:

T=(2pi)(\sqrt{L/g})

Where T is the period, L is the pendulum length and g is the gravity (9.81m/s^2)

From the previous expression we will have then that the length will be:

L=(g)*((T/2pi)^2)

Replacing:

L=(9.81m/s^2)*((36s/2pi)^2)

The towers height will be then: 322m

8 0
3 years ago
A student puts a beaker of boiling water where it touches a block of ice. Which two statements are true? A. Thermal energy will
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Answer: C and D

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6 0
4 years ago
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A .5kg bird is perched on its nest so that it has 50J of potential energy. how far is it off the of the ground?
pshichka [43]

It is 10.20 m from the ground.

<u>Explanation:</u>

<u>Given:</u>

m = 0.5 kg

PE = 50 J

We know that the Potential energy is calculated by the formula:

P. E = m \times g \times h

where m is the is mass in kg;  g  is acceleration due to gravity which is 9.8 m/s  and  h  is height in meters.

PE is the Potential Energy.

Potential Energy is the amount of energy stored when an object is stationary.

Here, if we substitute the values in the formula, we get

P. E = m \times g \times h

50 = 0.5 × 9.8 × h

50 = 4.9 × h

h = \frac {50} {4.9}

h = 10.20 m

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