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andreyandreev [35.5K]
3 years ago
8

Which is at rest relative to a seated passenger in a moving car?

Physics
2 answers:
AnnyKZ [126]3 years ago
5 0
THAT'S EASY BRO! the answer is the Seat!
Alisiya [41]3 years ago
5 0

Answer:

Explanation:

When a person is sitting in a moving car, he is in motion relative to the ground but he is at rest relative to the car.

Everything in the car is at rest relative to the person and the person is also at rest relative to other things in the car.

Thus, everything in the car is at rest relative to the person which is sitting in the car.  

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What determines the strength of the force of gravity: the mass or the volume of an object? why?
Shalnov [3]
The mass because u can look at this formula

F = G(m1 - m2/ d squared) - Do u see volume in this equation?
4 0
3 years ago
Read 2 more answers
A merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an axis that
julsineya [31]

Since angular speed is persistent, v/r is constant.
Where:

 v is tangential speed; and

 r is distance from axis.

 

Then equate v/r in both cases to get v in the second case.

Hence, speed = 2.2 x 2.1 / 1.4 meters

= 3.3 meters / seconds

 

Alternative solution would be:

w = 2.2 / 1.4 = 1.57

v = rw = 2.1 x 1.57 = 3.3 meters / seconds 

3 0
2 years ago
Which part of the manufacturing process involves heating and rolling blocks of steel into flat sheets and bars?
faltersainse [42]

A. Forming

Explanation:

Metal forming is a metallurgical process which involves heating and rolling blocks of steel into flat sheets and bars.

Metal forming is the process of working metals and utilizing its properties to form different shapes.

  • Metal forming is made possible by metallic bonds in metals.
  • The bulk of the physical properties of metals can be attributed to these bond types.
  • In metal forming, metals are shaped into different substances.
  • Metal forming preserves the mass of the metallic body and the shapes modified by force.

Learn more:

Metals brainly.com/question/9053565

#learnwithBrainly

8 0
3 years ago
An ultrasound unit is being used to measure a patient's heartbeat by combining the emitted 2.0 MHz signal with the sound waves r
alexandr402 [8]
Hi there, 
for this question we have:
Signal 2.0 MHz = Emitted so we can call it f_e
and we need the Reflected = f_{r}
In this question, we have a source which goes to the heart and a reflected which comes back from the heart and we need the speed of the reflected.
So you should know that the speed of reflected is lower than the source(Emitted). 
we also know: ΔBeat frequency(max) = 560 Hz = f_{b}
so we have: 
f_{e} - f_{r} = f_{b}
so frequency of Reflected is: 
2.0 × 10^6 Hz - 560 Hz = 1.99 × 10^6 Hz = f_{r}
now you know that Lambda = v/f 
so if we find the lambda with our Emitted then we can find v with the Reflected: 
Lambda = 1540(m/s) / 2.0 × 10^6 Hz = 7.7 × 10^-4 m 
=> v_{max} = (lambda)(f_{r} 
=> 7.7 × 10^-4m (1.99 × 10^6Hz) = 1532 m/s 
so the v_{max} is equal to 1532 m/s :)))
This question is solved by two top teachers as fast as they could :))
I hope this is helpful
have a nice day

8 0
3 years ago
Which value is most likely to be the pH of a salt that is formed by the reaction of a strong acid and a weak base?
Mice21 [21]
In a hydrolysis reaction between a strong acid and a weak base, the salt formed will have a pH less than 7. By virtue of this phenomenon between <span>weak bases and strong acids</span>, the anion of the strong acid will fail to attract the hydrogen ion<span>, while the cation from the weak base will donate a </span>proton<span> to the water forming a hydronium ion</span><span>.
</span>
7 0
2 years ago
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