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seropon [69]
3 years ago
8

Two lab carts are on a frictionless track, attached by a spring. The carts are pushed together by a student in a Physics lab, co

mpressing the spring fully. The student lets go of the carts and they move in opposite directions as the spring extends. Which of the following statements describes what happens to the car/spring system after the cars are released?
A. The kinetic energy remains constant.
B. The kinetic energy increases.
C. The momentum remains constant.
D. The momentum increases.
Physics
2 answers:
-Dominant- [34]3 years ago
8 0

Answer:

A) The kinetic energy remains constant

Feliz [49]3 years ago
8 0
A.the kinetic remains constant
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Waves transmit energy without transmitting matter, This means that we can move energy or information from one place to another without moving any substance from one place to another.
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3 years ago
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ONLINE CALCULATOR .A force of 187 pounds makes an angle of 73 degrees 36 ' with a second force. The resultant of the two forces
saul85 [17]

Answer:

The magnitudes of the second force is   Z = 129.9 N

The magnitudes of the  resultant force is   R = 256.047 N

Explanation:

From the question we are told that  

    The force is  F = 187 \ lb

     The angle made with second force \theta_o = 73 ^o 36' =  73 + \frac{36}{60}  =  73.6^o

     The angle between the resultant force and the first force \theta _1  = 29 ^o 1 ' = 29 + \frac{1}{60}  = 29.0167^o

For us to solve problem we are going to assume that

     The magnitude of the second force is  Z N

     The magnitude of the resultant force is R N

According to Sine rule

                \frac{F}{sin (\theta _o - \theta_1 }  = \frac{Z}{\theta _1}

Substituting values

             \frac{187}{sin(73.3 - 29.01667)} =\frac{Z}{sin (29.01667)}  

             267.82 =\frac{Z}{0.4851}  

              Z = 129.9 N

According to cosine rule

       R = \sqrt{F ^2 + Z^2 + 2(F) (Z) cos (\theta _o) }

Substituting values

     R = \sqrt{187^2 + 129.9 ^2  + 2 (187 ) (129.9) cos (73.6)}

     R = 256.047 N

 

3 0
3 years ago
Two stars of masses M and 6M are separated by a distance D. Determine the distance (measured from M) to a point at which the net
kotykmax [81]

Answer:

0.29D

Explanation:

Given that

F = G M m / r2

F = GM(6m) / (D-r)2

G Mm/r2 = GM(6m) / (D-r)2

1/r2 = 6 / (D-r)2

r = D / (Ö6 + 1)

r = 0.29 D

See diagram in attached file

7 0
3 years ago
If the plane is flying in a horizontal path at an altitude of 98.0 m above the ground and with a speed of 73.0 m/s, at what hori
snow_lady [41]

Explanation:

The given data is as follows.

     height (h) = 98.0 m,     speed (v) = 73.0 m/s,

Formula of height in vertical direction is as follows.

          h = \frac{gt^{2}}{2},

or,      t = \sqrt{\frac{2h}{g}}

Now, formula for the required distance (d) is as follows.

       d = vt

          = v \sqrt{\frac{2h}{g}}  

        = 73.0 m/s \sqrt{\frac{2 \times 98.0 m}{9.8 m/s^{2}}}  

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Thus, we can conclude that 326.5 m is the horizontal distance from the target from where should the pilot release the canister.

8 0
3 years ago
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aksik [14]

Answer:

The star is moving toward us

Explanation:

The wavelength of a distant object changes due to the change in the distance between the observer and the object. This is known as the Doppler effect.

If the wavelength decreases this means that the wavelength in going towards blue which is shorter wavelength. This is known as blue shift. If blue shift occurs then it means that the object is coming closer to the observer.

Hence, the star described here has blue shifted and is moving closer to us.

6 0
3 years ago
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