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lord [1]
2 years ago
7

How many half-lives have passed if a sample contains 25% of its original carbon-14?

Physics
1 answer:
ICE Princess25 [194]2 years ago
6 0

Answer: 2 half lives

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The climate of an area is based on A) Rivers and lakes B) natural resources. C) mountain and valleys. D) Precipitation and tempe
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It is D as it is the only answer referring to weather and climate.
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3 years ago
Calculate the speed of a train that traveled 810 kilometers in 9 hours.
Naya [18.7K]

Answer:

90 kilometers an hour

let me know if I'm wrong

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3 years ago
Discuss how energy conservation applies to a
timofeeve [1]

Answer:

a) in the upper position. b) in the lower position. c) in the lower position. d) in the upper position. f) Its kinetic and potential energy will be 0, but the energy is transferred to the element or body that stopped the movement of the pendulum

Explanation:

In the attached image we have the sketch of a pendulum system.

A) The potential energy is maximum when the pendulum is in the upper position (image, fig 1) because the elevation (h) is maximum with respect to the reference point.

B) the potential energy is minimum when the pendulum is in the lower pasition (image, fig 2) because the elevation (h) is cero with respect to the reference point.

Note: When the pendulum is coming down the potential energy is transforming in kinetic energy.

C) The kinetic energy is maximum when the pendulum is in the lower position (image, fig 2), because the potential energy has been transformed in kinetic energy.

D) The kinetic energy is maximum when the pendulum is in the upper position (image, fig 1) because at this moment the pendulum is at rest it means its velocity is 0. We know that the kinetic energy depends on the velocity.

f) The energy is transferred to the element or body that stopped the movement of the pendulum

4 0
2 years ago
Balances are used to measure what a. Mass of an object b. Volume c. Force acting upon it d. Level surfaces on the table
suter [353]
<span>a. Mass of an object </span>
4 0
3 years ago
A 90kg cannon fires 100kg shell with muzzle velocity of 75m/s. Calculate the recoil velocity of the cannon relative to the groun
Gala2k [10]

Answer: 83.8 m/s

Explanation:

momentum of shell = momentum of cannon

M(s) × V(s) = M(c) × V(c)

M(s) = mass of shell, V(s) = velocity of shell

M(c) = mass of cannon, V(c) = velocity of cannon

100kg × 75m/s = 90kg × V(c)

7500 = 90 × V(c)

7500 ÷ 90 = V(c)

83.3 = V(c)

5 0
3 years ago
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