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alisha [4.7K]
3 years ago
15

I’m just completely confused

Physics
1 answer:
Neporo4naja [7]3 years ago
6 0

4. It is substances

I don't know the 3rd one

Hope it helped you


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An empty elevator has a mass of 722 kg. It moves between floors at a maximum speed of 6.00 m/s. The elevator is stopped on the 2
FinnZ [79.3K]

Answer:

Explanation:

The lift is going down with acceleration

Initial speed u = 0

Final speed v = 6 m/s

distance s = 15.25 m

acceleration a = ?

v² = u² + 2 a s

6² = 0 + 2 x a x 15.25

a = 1.18 m /s²

Elevator is going down with acceleration  .

mg - T = ma where T is tension in the cable .

722 x 9.8 - T = 722 x 1.18

7075.6 - T = 851.96

T = 6223.64 N .

7 0
3 years ago
Water has a specific heat of 4.184
LuckyWell [14K]

Answer:

Water.

Explanation:

This means:

1) For the temperature of water to raise at any point to the next degree by 1°C, will require a specific heat capacity of  4.184  J/Kg°C

2) For the temperature of wood to raise at any point to the next degree by 1°C, will require a specific heat capacity of  1.760  J/Kg°C

Note that: specific heat is directly proportional to energy, therefore the higher the heat capacity, the higher the energy.

4.184  J/Kg°C is higher than 1.760  J/Kg°C, hence WATER needs more energy.

8 0
3 years ago
The magnitude of the charge of the electron is:
brilliants [131]

Answer:

a. Exactly the same as the magnitude of the charge of the proton.

Explanation:

The elementary charge (e) is the smallest electric charge that can exist in the universe. Any positive or negative electric charge can be expressed as a multiple of the elementary charge, since is the electric charge carried by a single proton or, equivalently, the magnitude of the electric charge carried by a single electron (-1e).

3 0
3 years ago
Acceleration​ is the change in the speed or direction of an object over time—in other words,acceleration is a change in an objec
leva [86]

Explanation:

The acceleration of an object is equal to the rate of change of velocity. Its mathematical form is given by :

a=\dfrac{v-u}{t}

Where

v is final velocity, u is initial velocity and t is time taken

The SI unit of velocity is m/s and that of time is s. The SI unit of acceleration is \dfrac{m/s}{s}=m/s^2

If final velocity is more than the initial velocity, acceleration is positive.

If the final velocity is less than the initial velocity, the acceleration is negative. It is also known as deceleration.

Hence, all the statement is true.

6 0
3 years ago
if a source of sound waves is rapidly approaching a person the sound heard by the person appears to have
musickatia [10]

<u>Answer</u>

Increasing frequency

<u>Explanation</u>

When the source of sound and the observer are moving towards each other the frequency tends to be increasing. Since wavelength is inversely proportional to the frequency, the wave decreases when the frequency increases.

These effect is called the Doppler effect named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842

4 0
3 years ago
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