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4 years ago

10

The spiral review which of the following represents 7 + 7 + 7+7

1 answer:

velikii [3]4 years ago

3 0

7 plus itself 4 times is 4 sevens aka 4*7
could alsto be 28

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The rectangular coordinates of a point are (5.00, y) and the polar coordinates of

Otrada [13]

Answer:

Explanation:

Polar coordinates formula

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3 years ago

How many types of quarks are there?<br> a. 2<br> b. 4<br> c. 6<br> d. 8

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There are 6 types of quarks.

Answer: C. 6

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3 years ago

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The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf. t/f

Svet_ta [14]

The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf is false. The kinetic energy on the shelf is zero because it is not in action.

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3 years ago

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A wad of clay of mass m1 = 0.49 kg with an initial horizontal velocity v1 = 1.89 m/s hits and adheres to the massless rigid bar

notka56 [123]

Answer:

<h2>The angular velocity just after collision is given as</h2><h2> $\omega = 0.23 rad/s$ </h2><h2>At the time of collision the hinge point will exert net external force on it so linear momentum is not conserved</h2>

Explanation:

As per given figure we know that there is no external torque about hinge point on the system of given mass

So here we will have

$L_i = L_f$

now we can say

$m_1v_1\frac{L}{2} = (m_2L^2 + m_1(\frac{L}{2})^2)\omega$

so we will have

$0.49(1.89)(0.45) = (2.13(0.90)^2 + 0.49(0.45)^2)\omega$

$\omega = 0.23 rad/s$

Linear momentum of the system is not conserved because at the time of collision the hinge point will exert net external force on the system of mass

So we can use angular momentum conservation about the hinge point

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3 years ago

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