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4 years ago

Which activity is an example of a chemical change?

Physics

2 answers:

saul85 [17]4 years ago

5 0

C lighting a match is a chemical reaction

melomori [17]4 years ago

3 0

The answer is C because when the chemicals on the tip of a match are heated up from friction it ignites.

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A golf ball is whacked in a direction 25 degrees south of the east axis. The ball travels 125m. What are the east and north comp

Natalka [10]

We are given:

Direction of motion: 25 degrees south of the east axis

Distance covered = 125 m

East component of the Ball:

this component is denoted by green color in the image

Once we drop a perpendicular from the end of the direction vector on the x-axis, we get a right angled triangle

The magnitude of the side of the triangle on the x-axis denotes the east component of the ball

Using trigonometry, we find that the east component of the ball is:

125 * Cos(25 degrees)

125 * 0.9 = 112.5 i (here, i denotes rightward direction on the x-axis)

North Component of the Ball:

this component is denoted by blue color in the image

Using trigonometry, we find that the North component of the ball is:

125* Sin(25 degrees) (-j) [j denotes upward movement on the y-axis, since the vector is acting downwards, we have used '-j']

125 * 0.42 (-j)

52.5 (-j) = -52.5 j

Therefore the direction vector of the ball is 112.5 i - 52.5 j

where 112.5 i is the East Component and -52.5 is the North Component

3 0

3 years ago

Your laundry basket Please 22 is in your room is 3.0 M above you on the second floor it takes you 6.0 seconds to carry the laund

Rainbow [258]

Power = (work done) / (time to do the work)

Work done = (force to lift the object) x (distance lifted)

In this question, the force is the (weight of the basket)+(your weight).

Work done = (weight of basket+you) x (3 meters)

Time to do the work = 6 seconds.

Power = (weights x 3 meters) / (6 seconds)

Power = (1/2)·(weight of the basket+you, in Newtons) watts

8 0

4 years ago

Read 2 more answers

Why you must always give a unit when reporting a measurement?

katrin2010 [14]

Unit of measurement are globally recognized and necessary for sharing information between scientists around the world.

An accepted quantity that is used to represent a physical quantity is called a measurement unit. A unit of measurement is a specific magnitude of a quantity that has been established and recognized by law or convention and is used as a benchmark for measuring other quantities of the same kind. A multiple of the unit of measurement can be used to express any other quantity of that type. A length is an example of a physical quantity.

A unit of measurement is a specific magnitude of a quantity that has been established and recognized by law or by convention and is used as a reference for measuring other quantities of the same kind.

To learn more about unit of measurement please visit -
brainly.com/question/15402847
#SPJ9

8 0

2 years ago

A substance of unknown mass absorbs 138 kilojoules of energy, going from 298 to 303 kelvin. if the specific heat of the substanc

AveGali [126]

Heat absorbed to raise the temperature is given by

$Q = mc\Delta T$

here

m = mass

c = 7.11 J/g C

$\Delta T = 303 - 298 = 5 kelvin$

Q = 138 KJ

Now by using the above formula we will have

$138 * 10^3 = m* 7.11 * 5$

$m = 3881 gram$

$m = 3.88 kg$

So the amount of the substance will be 3.88 kg

4 0

4 years ago

What is the role of the brain in helping an animal interact with its environment?

Masteriza [31]

Answer:

The nature of the environment and the animal's interaction with it determines much of the character of the brain.

Explanation:

In fact, most of what we would use to describe ourselves to others reflects this sort of information storage. Much of this information is unique to the individual and hence may involve different mechanisms from those used for species-typical information storage.

3 0

3 years ago