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Rasek [7]
3 years ago
5

What is the first time at which the kinetic energy is twice the potential energy?

Physics
1 answer:
Pavlova-9 [17]3 years ago
5 0

Answer:

When the tangent of the cyclic frequency and time will be equal √2

Explanation:

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A 72 kg skydiver is descending on a parachute. His speed is still increasing at 1.2 m/s2. What are the magnitude and direction o
denis23 [38]

Answer:

Parachute exerts a force of 619.2 N upward

The net force is 86.4 N acting downward

Explanation:

As the gravitational acceleration g = 9.8 m/s2, the parachute help reduces the net acceleration to 1.2m/s. So it must exerted an upward acceleration on the skydiver of

9.8 - 1.2 = 8.6 m/s2

Since the skydiver mass is 72 kg, we can use Newton's 2nd law to calculate the force that causes this acceleration of 8.6

F = ma = 8.6*72 = 619.2 N acting upward

The net force is also the product of net acceleration and mass

= 1.2 * 72 = 86.4 N acting downward

5 0
3 years ago
What is the average velocity of a dragster that starts from rest at the starting line and finishes a race at 2600 m/s in 12 seco
xxMikexx [17]
Using the equation v(avg)=distance/time 
and the equation v=v(original)+a(t)
solve for acceleration
2600=0+a(12)
a=216.66666 m/s^2

Then, you use the equation
v^2=v(original)+2a*(change in x)
2600^2=2(216.666666)*change in x
6760000/2/216.666666 = 15600 meters which is the length of the race

Then using v(avg)=x/t
15600/12= 1300 m/s
7 0
3 years ago
What energy happens when you plug in a blender?
Dvinal [7]

Answer:

Electrical to kinetic

Explanation:

8 0
3 years ago
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Can you hear it? In the cartoon space rocket, why do you think you would not be able to hear the whoosh of the rocket engine in
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Answer:

Because space is a void with no air flow

Explanation:

7 0
3 years ago
A dog sledding team is composed of a 82.8 kg musher (the person driving the sled), a 21.4 kg sled, and four dogs. Assume that ea
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Answer: 340.8W

Explanation: Please see the attachments below

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3 years ago
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