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3 years ago

When does the most significant drop in physical activity typically occur in people's lives?

Physics

1 answer:

Eduardwww [97]3 years ago

4 0

Answer:

Later high school years and freshman year of college

Explanation:

The transition from high school to college is an important developmental milestone that holds the potential for personal growth and behavioral change. A cohort of 2,025 students was recruited during the summer before they matriculated into college and completed Internet-based surveys about their participation in a variety of behavioral risks during the last three months of high school and throughout the first year of college. Alcohol use, marijuana use, and sex with multiple partners increased during the transition from high school to college, whereas driving after drinking, aggression, and property crimes decreased. Those from rural high schools and those who elected to live in private dormitories in college were at highest risk for heavy drinking and driving after drinking.

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Two cars, one of mass 1100 kg, and the second of mass 2500 kg, are moving at right angles to each other when they collide and st

Pie

Answer:

$v_{f}=17.47 m/s$

Explanation:

Let's use the conservation of momentum to solve it.

$p_{initial}= p_{final}$ (1)

The total initial momentum will be: $m_{1}v_{1i}+m_{2}v_{2i}$
The total final momentum will be: $m_{1}v_{1f}+m_{2}v_{2f}$ , but as they stick together after the collision, v1f = v2f = vf.

So we can rewrite (1), using the above information:

$m_{1}v_{1i}+m_{2}v_{2i}=m_{1}v_{f}+m_{2}v_{f}$

$m_{1}v_{1i}+m_{2}v_{2i}=v_{f}(m_{1}+m_{2})$

$v_{f}=\frac{m_{1}v_{1i}+m_{2}v_{2i}}{m_{1}+m_{2}}$

$v_{f}=\frac{1100\cdot 14+2500\cdot 19}{1100+2500}$

Finally, the magnitude of the velocity of the wreckage of the two cars immediately after the collision is:

$v_{f}=17.47 m/s$

I hope it helps you!

5 0

3 years ago

PLEASE HELP !

pochemuha

HOPE IT HELPS LET ME KNOW IF U NEED EXPLANATION

4 0

3 years ago

How is heat transferred?

leonid [27]

Answer:

convection, conduction, and radiation

Explanation:

4 0

3 years ago

Read 2 more answers

Starting from one oasis, Thaïs and Athanaël walk 25 km in a direction 30° south of west and then walk 30 km toward the north to

Fudgin [204]

Answer:

= 51° West of North

Explanation:

The displacement along the horizontal direction

$R_x = -(25km)cos 30^\circ i\\\\= -(21.65km)i$

The displacement along the vertical direction

$R_y = -(25km) sin210^\circ i + (30km)j\\\\= -(12.5km)j + (30km)j\\\\= (17.5km)j$

The magnitude of the displacement is

$R = \sqrt{(-21.65km)^2 + (17.5km)^2} \\$

The direction is

$\theta = tan^-^1(\frac{17.5km}{-21.65km} )\\\\= -38.9^\circ\\\\$

= 51° West of North

3 0

3 years ago

Read 2 more answers

Bats rely on sound localization to be able to fly during the night. on a cool 20 °c summer night, a bat produces an ultrasonic s

rjkz [21]

The unit of frequency, kHz, is also equivalent to 1/kilosecond or 1/1000 seconds. The equation relating wavelength and frequency is:

c = wavelength*frequency, where c is known as the speed of light. But since we are dealing with ultrasound, we use the speed of sound. The speed of sound is dependent on the temperature. The correlation would be:

c = 331 + 0.6T = 331 + 0.6(20°C) = 343 m/s

Therefore,

343 = wavelength * 1/1000
wavelength = 343,000 meters

4 0

4 years ago