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3 years ago

what percentage of North American adults may be functioning below their potential due to prolonged exposure to stress

Physics

1 answer:

Yuliya22 [10]3 years ago

6 0

I believe the percentage is between 15-20%. Stress is a well known factor that affects the performance of people.

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A net force acting on an object will always cause a change in the object's _________.

Nataly [62]

cause a change in the object's velocity

3 0

3 years ago

A cricket ball of mass 800g has momentum of 20kg m/s , calculate velocity of ball?

larisa86 [58]

P=MV

V=P/M

20/800

0.025

8 0

4 years ago

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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

g A uniform ladder whose length is 4.4 m and whose weight is 330 N leans against a frictionless vertical wall. The coefficient o

Damm [24]

Answer:

Distance = 4.4 [m]

Explanation:

This problem can be easily solved using a static analysis of forces acting on the ladder, taking into account the respective distances. For easy understanding, a free body diagram should be made.

We perform a sum of force on the X-axis equal to zero, to find that the force exerted by the wall is equal to the friction force on the floor.

Then we perform a summation of forces on the Y axis, to determine that the normal force exerted by the floor is equal to the weight of the ladder.

We know that the friction force is equal to the product of normal force by the coefficient of friction.

In this way, by relating the friction force to the equations deduced above we can find the force exerted by the wall.

Then we make a summation of moments around the base point of the ladder, the equation realized can be seen in the attached image.

In the last analysis we can find the relationship between the horizontal and vertical distance of the ladder, with respect to the wall and the floor.

Then with the complementary analysis of the Pythagorean theorem we can find another additional equation.

The result of the greater distance is 4.4 [m]

3 0

3 years ago

How much protons are in Li

harkovskaia [24]

Answer: 3

Explanation:

Lithium always has 3 protons bc it’s atomic number is 3 which is determined by its amount of protons.

6 0

3 years ago

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