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3 years ago

PLEASE HELP ASAP

Physics

2 answers:

Sholpan [36]3 years ago

4 0

D, excess body heat evaporates which cause sweat.

Dmitrij [34]3 years ago

3 0

The answer should be B

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3. Which of the following is true about astronauts taking out the TRASH?

scoray [572]

Answer:

Explanation:

When trash accumulates, astronauts manually squeeze it into trash bags, temporarily storing almost two metric tons of it for relatively short durations, and then send it away in a departing commercial supply vehicle, which either returns it to Earth or incinerates it during reentry through the atmosphere.

6 0

3 years ago

Which is colder, 0°C or 20°F?

Mashutka [201]

In order to compare the two temperatures, we need to convert 20°F into Celsius. The formula we need to use is:

$T(^{\circ}C)=\frac{5}{9}(T(^{\circ}F)-32)$

Substituting 20°F, we find

$T(^{\circ}C)=\frac{5}{9}(20^{\circ}F-32) =-6.7^{\circ}C$

And this is less than 0°C, so the answer is

20°F is colder than 0°C.

7 0

4 years ago

Read 2 more answers

A change in the termal energy of a substance can lead to a change of state. For example, when heat is added to a solid, its part

Svetllana [295]

Answer:

lado

Explanation:

because it is easy to do

5 0

3 years ago

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket

NARA [144]

The constant acceleration of a rocket launched upward, calculated knowing that the time it takes for a bolt that falls off the side of the rocker was 6.30 seconds, is 5.68 m/s².

When the rocket is launched straight up with constant acceleration, the acceleration of the rocket is given by:

$v_{f_{r}} = v_{i_{r}} + at$

Where:

$v_{f_{r}}$ : is the final velocity of the rocket

$v_{i_{r}}$ : is the initial velocity of the rocket = 0

a: is the acceleration

t: is the time

After 4 seconds, the final speed of the rocket will be the initial speed of the bolt, so:

$v_{f_{r}} = v_{i_{b}} = at = 4a$

When the bolt falls off the side of the rocket, the bolt hits the ground 6.30 seconds later.

The initial height of the bolt will be the final height of the rocket, and vice-versa. With this, we can take the final height of the bolt as zero.

$y_{f_{b}} = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$0 = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$y_{i_{b}} = \frac{1}{2}9.81*(6.30)^{2} - 4a*6.30 = 194.7 - 25.2a$

Now, as we said above, this height (of the bolt) will be the final height of the rocket, so:

$y_{f_{r}} = y_{i_{r}} + v_{i_{r}}t - \frac{1}{2}gt^{2}$

$194.7 - 25.2a = 0 + 0 - \frac{1}{2}a(4)^{2}$

$a = \frac{194.7}{33.2} = 5.86 m/s^{2}$

Therefore, the acceleration of the rocket is 5.68 m/s².

You can find another example of acceleration calculation here: brainly.com/question/24589208?referrer=searchResults

I hope it helps you!

3 0

3 years ago

A force acting on an object does no work if _____.

quester [9]

The force is greater than the force of friction is your answer but i would double check cuz im not 110% sure

4 0

4 years ago