PHYSICS MIDDLE SCHOOL

A student that jumps a vertical height of 50 cm during the hang time activity.a. What is the hang time of the student?
b. What speed must the student leave the ground with to reach that height?

Answers

Answer 1

Answer:

The hang time of the student is 0.64 seconds, and he must leave the ground with a speed of 3.13 m/s

Why?

To solve the problem, we must consider the vertical height reached by the student as max height.

We can use the following equations to solve the problem:

Initial speed calculations:

$v_(f)^(2)=v_(o)^(2)+2*a*d$

At max height, the speed tends to zero.

So, calculating, we have:

$v_(f)^(2)=v_(o)^(2)+2*a*d\n\n0=v_(o)^(2)+2*(-9.81(m)/(s^(2)))*0.5m\n\nv_(o)^(2)=9.81(m^(2) )/(s^(2))\n\nv_(o)=\sqrt{9.81(m^(2) )/(s^(2))}=3.13(m)/(s)$

Hang time calculations:

We must remember that the total hang time is equal to the time going up plus the time going down, and both of them are equal,so, calculating the time going down, we have have:

$y-yo=vo.t+(1)/(2)*9.81(m)/(s^(2))*t^(2) \n\n0.5m-0=0*t+4.95*t^(2)\n\nt^(2)=(0.5)/(4.95)\n\nt=√(0.101)=0.318s$

Then, for the total hang time, we have:

$TotalHangTime=2*0.318seconds=0.64seconds$

Have a nice day!

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Answers

Hi There! :)

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Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.

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Answers

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Answer:

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Who created E = mc2?
(What is it)?

Answers

Albert Einstein created this equation. It means that the formula $E= mc^(2)$ shows that mass can be converted into energy, and energy can be converted into mass. Einstein made this equation 100+ years ago, and yes, he was right with the theory.

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In 3-5 sentences, use your own words to explain how electricity gets from power plants to our homes.Use the "RAP" method to answer this question:

Restate the question
Answer the question
Prove your answer citing textual evidence from the course.
Don't forget to proofread your answer.

Answers

Answer:

so your wondering how electricity goes from power plants to your home? well, here's why.The electrical charge goes through high-voltage transmission lines that stretch across the country. It reaches a substation, where the voltage is lowered so it can be sent on smaller power lines. It travels through distribution lines to your neighborhood.

Electricity goes from power plants to our homes through a step-down transformer. This helps the voltage to be lowered because electricity has to have high amounts of voltage to travel. So once it’s been lowered, electricity gets transferred to smaller wires that connect to our outlets.

Mrs. Patil travels from her home to work in 0.25 hours. The direct distance between her home and work is 8.0 miles. If Mrs. Patil travels 12.4 miles from home to her job, what is her average velocity during the trip?

Answers

Regardless of the path taken, at the end of the trip Mrs. Patil will be 8.0 miles away from home. If the path taken involves a trip lasts 0.25 hours, then the average velocity over the trip is

$\frac{8.0\,\mathrm{mi}}{0.25\,\mathrm h}=32\,\frac{\mathrm{mi}}{\mathrm h}$