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3 years ago

What is a likely direct effect of a community program for local residents?

Physics

1 answer:

allochka39001 [22]3 years ago

5 0

Explanation:

improved saftey for children

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WILL GIVE BRAINLIEST

lisabon 2012 [21]

B 200N; 200N/10kg=20m/s2

4 0

4 years ago

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star.

Andrews [41]

Answer:

The question is incomplete however this kind of questions about determinate the angular speed and taking a reference of days rotating the first star.

w=0.11312 rad/s

Explanation:

The situation is about a two star the question is incomplete, miss the time rotate one star so we assume the first star rotated once in 30 days so:

Angular momentum

$P_{m}=I*w$

The inertia

$I=\frac{3}{5}*m*r^2$

The momentum must be conserved so

$P_{m1}=P_{m2}$

$I_{1}*w_{1}=I_{2}*w_{2}$

$\frac{2}{5}*m*r_{1}^2*w_{1}=\frac{2}{5}*m*r_{2}^2*w_{2}$

notice don't have to know the mass or use the density however at the end can determinate

$w_{2}=\frac{r_{1}*w_{1}}{r_{2}}$

Time can determinate the frequency so determinate angular speed of the first star

$w_{1}=2\pi*f_{1}$

$t_{1}=30days*\frac{24hr}{1day}*\frac{60minute}{1hr}*\frac{60s}{1minute}=2592000s$

$f_{1}=\frac{1}{t_{1}}=\frac{1}{2592000}=3.858x10^-7Hz$

$w_{1}=2.424x10^{-6}\frac{rad}{s}$

$w_{2}=\frac{7.0x10^8m}{15x10^3m}*2592000$

$w_{2}=0.11312 rad/s$

4 0

3 years ago

A 85-kg physics student jumps from a dock into a 135 kg boat that is at rest by the dock. If the velocity

Gnesinka [82]

Answer:

<em>The final velocity of the student and the boat is 1.66 m/s</em>

Explanation:

<u>Law Of Conservation Of Linear Momentum </u>

The total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and velocity v is P=mv. If we have a system of bodies, then the total momentum is the sum of them all

$P=m_1v_1+m_2v_2+...+m_nv_n$

Let's call $m_s = 85\ kg$ the mass of the physics student, $m_b = 135\ kg$ the mass of the boat, $v_{so} =4.3\ m/s$ the initial speed of the student, $v_{bo} =0$ the initial speed of the boat, $v_f$ the final speed of both, assumed common since they keep joined after the jump. Applying the law of conservation of momentum, being $P_o\ and\ P_f$ the initial and final momentum of the system, we have