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WINSTONCH [101]
3 years ago
7

Select the correct answer.

Physics
2 answers:
Dahasolnce [82]3 years ago
5 0

Answer:

a is the correct choice

Explanation:

Nina [5.8K]3 years ago
4 0

Answer:

The answer is A

Explanation:

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Alan leaves Los Angeles at 8:00 a.m. to drive to San Francisco, 400 mi away. He travels at a steady 46.0 mph . Beth leaves Los A
elena-14-01-66 [18.8K]

Answer:

25 min, 48 sec

Explanation:

Alan:

t = d/v

  = 400 mi / 46 mph = 8.70 hr

So it took Alan 8.70 hrs; from 8 am, that's 4:42 pm that he arrives.

t = d/v

  = 400 mi / 55 mph = 7.27 hr

So it took Beth 7.27 hrs; from 9 am, that's 4:16:12 that she arrives.

4:42 - 4:16:12 = 25.8 minutes = 25 minutes, 48 sec

4 0
4 years ago
A 2.0kg rocket is traveling straight up. What force muse be applied to the rocket for it to move at a constant velocity?
Yuliya22 [10]
A equal force it always has to be equal
5 0
4 years ago
A cube of ice at an initial temperature of -15.00°C weighing 12.5 g total is placed in 85.0 g of water at an initial temperature
Leona [35]

<u>Answer:</u> The specific heat of ice is 2.11 J/g°C

<u>Explanation:</u>

When ice is mixed with water, the amount of heat released by water will be equal to the amount of heat absorbed by ice.

Heat_{\text{absorbed}}=Heat_{\text{released}}

The equation used to calculate heat released or absorbed follows:

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]       ......(1)

where,

q = heat absorbed or released

m_1 = mass of ice = 12.5 g

m_2 = mass of water = 85.0 g

T_{final} = final temperature = 22.24°C

T_1 = initial temperature of ice = -15.00°C

T_2 = initial temperature of water = 25.00°C

c_1 = specific heat of ice = ?

c_2 = specific heat of water = 4.186 J/g°C

Putting values in equation 1, we get:

12.5\times c_1\times (22.24-(-15))=-[85.0\times 4.186\times (22.24-25)]

c_1=2.11J/g^oC

Hence, the specific heat of ice is 2.11 J/g°C

3 0
4 years ago
Hooke's law states that the force, F, in a spring extended by a length x is given by
timofeeve [1]

Answer:

dimensions of k are  kg / s^2

Explanation:

F=ma   (Newton's second law)

F=-kx   (Hooke's law)

so equate both

-kx = ma

k = -ma/x

= mass * acceleration / distance  (dimensions, -1 has no dimension)

= kg * m/s^2 / m

= kg / s^2

6 0
3 years ago
Quem é ou foi Elon Musk??
mario62 [17]

Explanation:

Elon Reeve Musk FRS (/ ˈiːlɒn /; nascido em 28 de junho de 1971) é engenheiro, designer industrial, empresário de tecnologia e filantropo. Ele é o fundador, CEO, CTO e designer-chefe da SpaceX; investidor inicial, [nota 1] CEO e arquiteto de produto da Tesla, Inc.; fundador da The Boring Company; co-fundador da Neuralink; e co-fundador e co-presidente inicial da OpenAI. Ele foi eleito membro da Royal Society (FRS) em 2018. Em 2018, ele foi classificado em 25º na lista da Forbes das pessoas mais poderosas do mundo, e foi classificado em primeiro lugar na lista da Forbes dos líderes mais inovadores de 2019. Em 29 de julho de 2020, seu patrimônio líquido foi estimado em US $ 68 bilhões e ele foi listado pela Forbes como a nona pessoa mais rica do mundo. Ele é o CEO com o mandato mais longo de qualquer fabricante automotivo globalmente.

3 0
3 years ago
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