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vampirchik [111]
3 years ago
10

~~~~NEED HELP ASAP~~~~

Physics
2 answers:
maksim [4K]3 years ago
4 0

the above three pictures may help you

go through the attachments

Softa [21]3 years ago
3 0

Answer:

Block A velocity is 23.33 m/s and the collission is not elastic.

Explanation:

a) m1v1 + m2v2 = m1v1' + m2v2'

Plug in givens

90+60=3v1'+80

solve for v1'= 23.33m/s

b) Find the initial and final kinetic energy of Block B

Ki= 1/2(4)(15)^2 + 1/2(3)(30)^2 = 1800 J

Kf= 1/2(4)(20)^2 + 1/2(3)*(23.33)^2= 1616.433J

Since Ki does not equal Kf the collision is not elastic

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Ari uses a tool called calipers to measure the diameter of different cylinders he is using in an experiment. His old calipers co
Vladimir [108]

Answer:

Explanation:

Different measuring instruments have different level of precision . For example , our usual scale can measure upto 1 mm. Callipers can measure upto .1 mm. screw gauge can measure upto .01 mm.etc The deeper it can measure , the more precise it is. Hence screw gauge is most precise among the three.

On this basis we can say that , new caliper is less precise than old one.

Accuracy tells us about our result , how close our result is to the true measurement. It is dependent on  the manner in which  we take reading , So measuring methods , rather than measuring instruments , decide the accuracy of our result.

Hence we can say that the new caliper is less precise only.

7 0
3 years ago
A net force applied to a 15.0 kg box produced an acceleration of 4.2 m/s2. If the same net force was applied to a 10 kg box, wha
igor_vitrenko [27]

Answer:

6.3\ m/s^2

Explanation:

Given that,

If the mass of a body is 15 kg and produced an 4.2 m/s², we need to find the acceleration if the mass is 10 kg and the same force is applied.

Force is given by :

F = ma

Since force is same

m_1a_1=m_2a_2\\\\a_2=\dfrac{m_1a_1}{m_2}\\\\a_2=\dfrac{15\times 4.2}{10}\\\\a=6.3\ m/s^2

So, if the mass is 10 kg, acceleration is 6.3\ m/s^2

8 0
3 years ago
In 1687, Isaac Newton published a book explaining his three laws of planetary motion and the law of gravity. The importance of t
alexdok [17]
B. all of nature follows uniform, unchaining laws.
5 0
3 years ago
Can you put hot water in a insulated gatorade cooler
Elina [12.6K]
Yes is the answer for you
5 0
3 years ago
A square coil, enclosing an area with sides 3.2 cm long, is wrapped with 2,720 turns of wire. A uniform magnetic field perpendic
marishachu [46]

Answer

\epsilon = -0.74\ V

Explanation:

given,                          

Side of square coil = 3.2 cm            

Number of turns = 2720                  

magnetic field in the coil increases to = 0.45 T

time interval = 1.7 s                  

average induced voltage in the coil = ?

length = 0.032 m                      

Area = 0.032² = 0.001024 m²

induced voltage                  

\epsilon = -NA \dfrac{dB}{dt}

\epsilon = -2720 \times 0.001024 \times \dfrac{0.45}{1.7}

\epsilon = -0.74\ V                          

The average voltage induced in the coil is equal to \epsilon = -0.74\ V                                              

3 0
3 years ago
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