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Ainat [17]
1 year ago
5

A rocket in outer space is traveling toward a far-off planet. An astronaut turns on the rocket’s engines, which exerts a force o

n the rocket. There is no gravity or air resistance.When the astronaut turns off the engines, what will the rocket do?possible answersIt will steadily slow down because no forces are acting on it.It will continue moving with a constant speed because no forces are acting on it.It will continue moving with a constant speed because the force from the engines is still acting on it.It will steadily slow down until the force from the engines is gone.
Physics
1 answer:
vazorg [7]1 year ago
5 0

Answer:

It will continue moving at a constant speed because no forces are acting on it.

Explanation:

By the second law of Newton, the force is proportional to the acceleration. If there is no force, there is no acceleration. So, when the astronaut turns off the engines, the rocket will have no acceleration which means that the speed will be constant.

Therefore, the answer is:

It will continue moving at a constant speed because no forces are acting on it.

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A student is helping her teacher move a 9.5 kg box of books. what net sideways force must she exert on the box to slide it acros
Tanzania [10]

Mass of the box which contains books (m) = 9.5 kg

Acceleration required (a) = 1 m/s^2

Let the force applied by the teacher and student be F.

The only force acting in the horizontal direction is F and it will produce an acceleration of 1 m/s^2

According to Newton's Seconds law:

F(net) = ma

F = ma

F = 9.5 × 1

F = 9.5 Newtons

Hence, the sideways force applied by teacher and the students is equal to 9.5 Newtons

7 0
3 years ago
A woman is sitting at a bus stop when an ambulance with a siren wailing at 317 Hz approaches at 69 miles per hour (mph). Assume
xxMikexx [17]

Answer:

a) 30.84m/s

b) 348.32Hz

c) 32.34m/s

d) 289.69Hz

Explanation:

a) If 1 mile=1609,34m, and 1 hour=3600 seconds, then 69mph=69*1609.34m/3600s=30.84m/s

b) Based on Doppler effect:

/*I will take as positive direction the vector \vec r_{observer}-\vec r_{emiter} */

f_{observed}=(\frac{v_{sound}-v_{observed}}{v_{sound}-v_{emited}})f_{emited}

f_{observed}=(\frac{343m/s-0m/s}{343m/s-30.84m/s})317Hz=348.32Hz

c) 350Hz=(\frac{343m/s-0m/s}{343m/s-v_{ambulance}})317Hz, V_{ambulance}=343m/s-\frac{317Hz}{350Hz}.343m/s=32.34m/s

d) f_{observed}=(\frac{343m/s-0m/s}{343m/s+32.34m/s})317Hz=289.69Hz

3 0
3 years ago
What is one advantage of doing a feild experiment instead of a lobortory expirament
Scrat [10]

Answer:

- High internal validity as there is good control over all variables

- Allows for precise control over extraneous variables and IV

- Easy to replicate due to standardised procedure

you can choose one of them

hope this can help you

5 0
3 years ago
What is sap?
Paladinen [302]
Its A Sap is basically a fluid which is transported in to the xylem tubes.
4 0
3 years ago
Read 2 more answers
Entific findings are useful
Kaylis [27]

That's true.  The give-away is "observation ... in the real world".  That's what "field reports" are.

The part I'm not so sure about is those "entific findings".

4 0
3 years ago
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