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lutik1710 [3]
2 years ago
7

How do you find free fall?

Physics
1 answer:
laila [671]2 years ago
6 0

Answer:

Choose how long the object is falling. In this example, we will use the time of 8 seconds. Calculate the final free-fall speed

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Which of these is always conserved in a collision in a closed system?
Bumek [7]

Answer:

B) momentum and mechanical energy

Explanation:

In classical physics, a closed system is a system that does not exchange any matter with the surrounding, and on which there are no external forces acting on it.

Due to this definition, we have the following consequences:

- In a collision in a closed system, momentum is always conserved. This is because there is exchange of matter with the surroundings (so, no mass can be lost), and also because there are no external forces acting on the objects inside the system. In fact, the variation of the total momentum of the system is related to the net force acting on the system:

F=\frac{\Delta p}{\Delta t}

but since the net force F is zero, then the variation of momentum, \frac{\Delta p}{\Delta t}, is also zero, therefore the momentum is constant.

- Also, mechanical energy is conserved. Mechanical energy is the sum of potential energy and kinetic energy of the system: again, since there are no external forces acting on the system, energy cannot be dissipated, so the total energy of the system cannot change.

4 0
3 years ago
Read 2 more answers
Is Vaseline flammable?
FinnZ [79.3K]
When its still the form of jelly, it is flammable, but it does not go everywhere or it  doesn't evaporate.
5 0
3 years ago
Polymetrics can help a person maintain cardiorespitory fitness T or F
Verdich [7]

Answer:

True

Explanation:

The term 'plyometrics' is used interchangeably with the term 'jump training'. The technique can be used for training in sports that require explosive movements.

8 0
3 years ago
A golf club is swung and strikes a golf ball with a force of 12.2 N. The golf ball accelerates at 265.2 m/s2 (wow) Determine the
Sunny_sXe [5.5K]

F = m A  (Newton #2)

m = F/A

m = (12.2 N) / (265.2 m/s²)

m = (12.2 / 265.2) kg

<em>m = 0.046 kg  </em>

(46 grams;  not bad; the international standard is "not more than 45.93 grams")

Note:  265.2 m/s² = about 27 G's .  Seems to me like that would rip the ball to shreds, but I don't really know anything about golf.)

7 0
3 years ago
A roller coaster's velocity at the bottom of a hill is 35.0 m/s, 5.00 seconds later it reaches the top of the hill with a veloci
anyanavicka [17]

Answer:

5 m /s^2

Explanation:

Change in velocity = 35 - 10 = 25 m/s

change in time = 5 s

decelleration = 25/5 = 5 m/s^2

4 0
2 years ago
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