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4 years ago

What is the definition for chemical change

2 answers:

8 0

Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms.

Leni [432]4 years ago

4 0

It is a change that results in a new chemical substance.

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Two uniform cylinders have different masses and different rotational inertias. They simultaneously start from rest at the top of

NARA [144]

Option (E) is correct

Neither (they arrive together)

Explanation:

Neither of the cylinders gets to the bottom first, they both will arrive together. Every object can gain speed with time if it is pushed, it is called the acceleration of that object. It the acceleration that decides which object reaches the bottom first.

Acceleration = I / mr^2.

In the case of both the cylinders, the acceleration will be the same, with the same acceleration they will reach the bottom at the same time.

7 0

3 years ago

A weather balloon is rising vertically from a launching pad on the ground. A technician standing 300 feet from the launching pad

avanturin [10]

Answer:

$\dfrac{dh}{dt} =5\ ft/s$

Explanation:

Let

h = height of balloon (in feet).

θ = angle made with line of sight and ground (in radians).

h = 300 tanθ

$\dfrac{dh}{d\theta } = 300 sec^2\theta$

now $\dfrac{dh}{dt}$ can be written as

$\dfrac{dh}{dt} =\dfrac{dh}{d\theta }\times \dfrac{d\theta }{dt}$

$\dfrac{d\theta }{dt} = \dfrac{1}{120}\at \ \theta =\dfrac{\pi}{4}$

When θ = π/4,

$\dfrac{dh}{d\theta } = 300 sec^2\theta$

$\dfrac{dh}{d\theta } = 600$

$\dfrac{dh}{dt} =\dfrac{dh}{d\theta }\times \dfrac{d\theta }{dt}$

$\dfrac{dh}{dt} =600\times \dfrac{1}{120}$

$\dfrac{dh}{dt} =5\ ft/s$

5 0

4 years ago

3.)What is a medium? Plzzz help

OLEGan [10]

Answer:

Medium, in occultism, a person reputedly able to make contact with the world of spirits, especially while in a state of trance.

Explanation:A spiritualist medium is the central figure during a séance (q.v.) and sometimes requires the assistance of an invisible go-between, or control.

8 0

3 years ago

Read 2 more answers

How do we capture and use solar energy

Dmitry_Shevchenko [17]

Solar panels for light

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3 years ago

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Which area of physics involves using a compass in the woods?

jarptica [38.1K]

Magnetism. A compass uses the earth's magnetic field to point in the direction of the north geographic pole (south magnetic pole) the N point on a compass points to the S magnetic pole which is the north geographic pole. It's a little confusing, but it's just opposites.

6 0

4 years ago