3 years ago

4. What would be the mass of #3 in kilograms?

Physics

1 answer:

Nezavi [6.7K]3 years ago

7 0

Answer:

0.003

Explanation:

3 is in grammes so you divide by 1000

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An 80-kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15 m/s . How fast wil

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Answer:

The speed of the quarterback backward is $v_q = 0.08 \ m/s$

Known are

$m_Q , m_B , (v_{Bx})_i (v_{Qx})_f, (v_{Bx})_f$

Unknown

$(v_{Qx})_f$

Explanation:

From the question we are told that

The mass of the quarterback is $m_Q = 80 \ kg$

The mass of the ball is $m_B = 0.43 \ kg$

The speed of the ball is $v_{B x}= 15 \ m/s$

The law of momentum conservation can be mathematically represented as

$m_Q u_{Qx} + m_Bu_{Bx} = - m_{Q} v_{Qx} + m_B v_{Bx}$

Now at initial both ball and quarterback are at rest and the negative sign signify that the quarterback moved backwards after throwing the ball

$m_Q v_{Qx} = m_B v_ {Bx}$

=> $v_{Qx} = \frac{m_Bv_{Bx}}{m_Q}$

substituting values

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$v_q = 0.08 \ m/s$

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A large pendulum swings in the lobby of the United Nations building in New York City. The pendulum has a 91-kg gold-plated bob a

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3 years ago

HELP ME ASAP ITS PHYSICS AND it’s finding the kinetic energy SHOW WORKKK

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k = 1/2 × m × v^2

_____________________________

1. k = 1/2 × 60 × ( 10 )^2

k = 30 × 100

k = 3000 j

_____________________________

2. k = 1/2 × 60 × ( 9 )^2

k = 30 × 81

k = 2430 j

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3. k = 1/2 × 60 × ( 4 )^2

k = 30 × 16

k = 480 j

_____________________________

4. k = 1/2 × 60 × ( 6 )^2

k = 30 × 36

k = 1080 j

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5. k = 1/2 × 60 × ( 0 ) ^2

k = 30 × 0

k = 0 j

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3 years ago

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