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3 years ago

How much acceleration can most humans stand before they pass out?

1 answer:

4 0

Normal humans can withstand no more than 9 g's, and even that for only a few seconds. When undergoing an acceleration of 9 g's, your body feels nine times heavier than usual, blood rushes to the feet, and the heart can't pump hard enough to bring this heavier blood to the brain.

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2. A pendulum is built by attaching a 1-kg mass to the end of a 120 cm-long string. The mass is

vodka [1.7K]

Answer:

G. 2s

Explanation:

The period of a pendulum is measured in time. Out of the four options, only one of them is measured in time so it must be G.

A period of a pendulum is how long it takes to swing back to it's original position, and this time (2 seconds) is given in the question as well

5 0

3 years ago

A ball held 2.0 meters above the floor has 59 joules of potential energy the bald mass is about

PilotLPTM [1.2K]

Answer:

Mass of ball = 3.0102 Kg.

Explanation:

Potential energy at height h is given by

PE = mgh

where m is the mass of the body

g is the the acceleration due to gravity whose value is 9.8 m/s^2

h is the height from surface level

PE is potential energy

In the problem given h = 2 meters

PE = 59 joules

59 = m*9.8*2

=> m = 59/9.8*2 = 3.0102 Kg

Thus, mass of ball is 3.0102 Kg.

4 0

4 years ago

A runner circles the track exactly 2 times for distance of 800m. it takes 4.0min. what is her average speed in m/s? what is her

Sindrei [870]

If the runner ends where she started, then her total displacement is $\Delta x=0\,\mathrm m$ , which means her average velocity will be

$\bar v=\dfrac{\Delta x}{\Delta t}=\dfrac{0\,\mathrm m}{4.0\,\mathrm{min}\cdot\frac{60\,\mathrm s}{1\,\mathrm{min}}=0\,\dfrac{\mathrm m}{\mathrm s}$

The total distance she traversed, however, was $\Delta d=800\,\mathrm m$ , which gives her an average speed of

$\bar s=\dfrac{\Delta d}{\Delta t}=\dfrac{800\,\mathrm m}{4.0\,\mathrm{min}\cdot\frac{60\,\mathrm s}{1\,\mathrm{min}}=3.3\,\dfrac{\mathrm m}{\mathrm s}$

5 0

4 years ago

HELP?!

svetoff [14.1K]

Answer is the highest temperature, so D

Higher temperatures allow for sound to move faster, since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. This is faster than 331 meters per second, which is the speed of sound in air at freezing temperatures.

Neat little fact: This is also why in the winter when there is snow on the ground, it seems more peaceful and quite. The snow absorbs the sound waves and the temperature makes them not travel as fast, getting more quite as they go.

6 0

4 years ago

Read 2 more answers

A 32.0 kg wheel, essentially a thin hoop with radius 1.20 m, is rotating at 280 rev/min. It must be brought to a stop in 15.0 s.

elena-14-01-66 [18.8K]

Answer:

A) Must be done 19806.62 joules of work.

B) The average power is 1320.44 Watts.

Explanation:

A) First, we're going to use the work-energy theorem that states total work ( $W$ ) done on an object is equal to the change in its kinetic energy ( $\Delta K$ ):

$W=\Delta K = K_{f}-K_{i}$ (1)

So, all we must do is to find the change on kinetic energy. Because we're working with rotational body, we should use the equation $K=\frac{I\omega^{2}}{2}$ for the kinetic energy so:

$\Delta K=\frac{I(\omega_{f})^{2}}{2}-\frac{I(\omega_{i})^{2}}{2}$ (2)

with $\omega_{i}$ the initial angular velocity, $\omega_{f}$ the final angular velocity (is zero because the wheel stops) and I the moment of inertia that for a thin hoop is $I=MR^{2}$ , using those on (2)