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Rainbow [258]
4 years ago
12

Watch the video and write ur observationhttps://youtu.be/ViZNgU-Yt-Y

Physics
1 answer:
WARRIOR [948]4 years ago
8 0

Answer:

1. Hover Plate: (You need Styrofoam Plates and a cloth) Styrofoam plates are great for static electricity tricks. When you give them a charge and hold one above the other, you can feel an incredible amount of resistance.

2. Can Can Go (You need a coke can, PVC pipe and a cloth) This is a classic but still fun. Try standing the can up and then tip it over with static, or try pulling 2 cans at the same time.

3. Stick Around (You need a small wooden stick, glass jar, thread, tape, PVC pipe and a cloth) This one is fun because half of the time the wooden stick will come toward the pvc pipe, and other times it will move away from the pipe. When it moves away, it will stick the the side of the jar and remain there for a period of time. It also fun to use as large a jar as possible to increase the dramatic effect of the pipe moving the stick from such a large distance.

4. Bubble Trouble (You need bubble solution, plexi-glass, PVC pipe, straw and a cloth. This is a fun trick because the bubbles change their shape and move when the pvc pipe is near. It's also fun to create bubbles inside of bubbles to watch the effect of the static electricity. And also create multiple bubbles on the sheet and watch them all travel toward the pipe.

5. Dancing Balls (You need styrofoam balls, aluminum foil, plexi-glass, cloth, and an area to keep the balls from escaping. This trick is really impressive but can be a bit difficult to recreate. When the plexi-glass plate is charged and placed over the balls, they all jump up and stick to the bottom of the glass. For a few moments they travel around sporadically until they finally settle. But when you put your finger near the glass, they all start jumping around. It's also fun to use these balls with styrofoam plates / cups. If you place the ball on a charged plate, it will shoot off of the plate, or stick to it, even if the plate is held sideways or upside down.

6. Water Bender (You need a cup that you can poke a hole in,  water, PVC pipe and a cloth. This is  a classic but still fun.

7. Balloon Fight (You need balloons, thread, PVC pipe and cloth. When the conditions are just right, the balloon can almost levitate about the pipe. But most of the time you can have fun pushing the balloons around with the charged pipe.

8. Electroscope (You need, steel wire, jar, straw, aluminum foil, PVC pipe and a cloth) This one is really impressive to see in person. A really cool effect to try, which you can see in this video, is to rub the cloth on the pvc pipe from several feet away from the jar. When you run the pipe, you can see the aluminum foil pieces in the jar, moving. I was able to stand as far as 5 feet away and still see the effect.

9. Wingardium Leviosa (You need very light weight / thin plastic bags, cloth, PVC pipe) This is my favorite trick. Again, with the correct conditions, you can get the plastic pieces  to float over foot above the pipe. Produce bags from the grocery store work great. You can float an entire produce bag in the right conditions.

Explanation:

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An 84.0 kg sprinter starts a race with an acceleration of 1.76 m/s2. If the sprinter accelerates at that rate for 11 m, and then
gulaghasi [49]

Answer:

t=17.838s

Explanation:

The displacement is divided in two sections, the first is a section with constant acceleration, and the second one with constant velocity. Let's consider the first:

The acceleration is, by definition:

a=\frac{dv}{dt}=1.76

So, the velocity can be obtained by integrating this expression:

v=1.76t

The velocity is, by definition: v=\frac{dx}{dt}, so

dx=1.76tdt\\x=1.76\frac{t^{2}}{2}.

Do x=11 in order to find the time spent.

11=1.76\frac{t^2}{2}\\ t^2=\frac{2*11}{76} \\t=\sqrt{12.5}=3.5355s

At this time the velocity is: v=1.76t=1.76*3.5355s=6.2225\frac{m}{s}

This velocity remains constant in the section 2, so for that section the movement equation is:

x=v*t\\t=\frac{x}{v}

The left distance is 89 meters, and the velocity is 6.2225\frac{m}{s}, so:

t=\frac{89}{6.2225}=14.303s

So, the total time is 14.303+3.5355s=17.838s

7 0
3 years ago
In a ballistics test, a 24 g bullet traveling horizontally at 1300 m/s goes through a 25-cm-thick 360 kg stationary target and e
MaRussiya [10]

Answer:

A)0.00022s b)40363.6N c) 0.025m/s

Explanation:

Mass = 24g = 0.024kg, distance though the target = thickness of the target = 25cm = 0.25m

Initial speed of the bullet = 1300m/s, final speed = 930m/s

Using equation of motion

Distance = 1/2(vf+vi)*t (time in seconds)

t = 0.25*2/(1300+930) = 0.00022s

B) force exerted on the body

F = ma = m* (vf-vi)/t = 0.024*(930-1300)/0.00022

F = -40363N, it is negative because the body decelerated during this motion

C) using law of conservation of momentum,

M1*U1+ M2*U2(M2and U1 are the mass and initial speed of the body) = M1V1+ M2V2

The target was at rest so initial speed U2 = 0

0.024*1300 + 360*0 = 0.024*930 + 360*V2

31.2 = 22.32+360*V2

31.2-22.33 = 360*V2

V2 = 8.88/360 = 0.025m/s

8 0
3 years ago
In general relativity, gravitational red shift is caused by
kvasek [131]
Option D would be the correct one!
7 0
3 years ago
Can one individual represent and entire population? Why or why not
zubka84 [21]

Answer:

Explanation:

A representative does his/her utmost to convey the feelings of the majority of the group they speak for, and stands up for their interests. This might be for negotiation, voting, litigation, diplomacy, etc.  

A leader, ideally, inspires their constituents and brings out the best in them, as in strength, ethics, spirituality, and so on.  

Short version: a rep is an agent or conduit. A leader is a catalyst. Either job can be hard. And yes, it can be done for most of a population. Maybe not all, but not everyone can fit into the same mold.

8 0
3 years ago
Which can do work faster-a 700 watt gasoline engine or a 300 watt electric motor
iogann1982 [59]

"700 watts" means 700 joules of work per second.

"300 watts" means 300 joules of work per second.

If the labels on both machines are true, and both machines
are loaded to their full capacity, then the 700-watt engine
is doing work faster than the 300-watt one.
3 0
3 years ago
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