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3 years ago

Can anybody help me with this Physics question! (DUE TOMORROW) (WILL MARK BRAINLIST)

Physics

2 answers:

Inga [223]3 years ago

7 0

1. How is physical change different from chemical change?

physical changes are changes that affect the form of a substance but not it's chemical composition

chemical changes are changes that change a chemicals composition

2. do you think Biological changes are chemical or physical or both?

the answers both as Biological change is progressive change in size, shape, and function

3. change in size, shape, and function.

4. a. chemical
b. chemical
c. chemical
d. biological
e. physical

5.
a. qualative, physical
b. qualative, biological
c. quantative, physical

Ymorist [56]3 years ago

3 0

Do you need help with all of them

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Can someone explain the normal force? where does it come from? ...?

Vilka [71]

<span>The normal force is the support force exerted upon an object which is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. The normal force in itseñf comes from the third law of Newton as a reactive force</span>

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3 years ago

A firecracker in a coconut blows the coconut into three pieces. Twopieces of equal mass fly off south and west, perpendicular to

loris [4]

Answer:

V = 13m/s

North-East (i.e. 45 degree from North)

Explanation:

This question deals with the idea of momentum.

Since the directions of a compass are fixed, we can take south as horizontal and west as vertical. Since both pieces of coconut are of equal mass, then the resultant of the two pieces would be in between South and West and the third piece would be opposite this direction and be in the North-East (i.e. 45 degree from North) direction

To find the speed of the third piece, we first find the speed on the two pieces of the coconut in terms of $V_{x}$ (horizontal component of velocity) and $V_{y}$ (vertical component of velocity)

We have

$V_{y}$ = Velocity in South direction = 18m/s

$m_{y}$ = Mass of piece in South direction = m

$V_{x}$ = Velocity in West direction = 18m/s

$m_{x}$ = Mass of piece in West direction = m

$V_{ry}$ = Velocity of Third Piece in North direction = unknown

$V_{rx}$ = Velocity of Third Piece in East direction = unknown

$m$ = Mass of third piece = 2m

$mV_{ry} = m_{y} V_{y} \\ 2mV_{ry} = m18\\ V_{ry} = 9$

$mV_{rx} = m_{x} V_{x} \\ 2mV_{rx} = m18\\ V_{rx} = 9$

Since we now know the horizontal and vertical component of the velocity of the third piece of coconut we find the resultant velocity. Since we know the direction is North-East, we can imagine a right angled triangle with base of 9 and height 9 and the hypotenuse equal to the resultant velocity .

We can simply apply the Pythagoras theorem and find the hypotenuse

$Hypotenuse^{2} = Height^{2} + Base^{2} \\ V_{3}^2 = 9^{2} + 9^{2} \\ V = 12.728 m/s$

V = 13m/s

6 0

3 years ago

If a object is at rest, does it mean there are no forces acting on it

Ganezh [65]

Yes that is correct :)

4 0

3 years ago

Read 2 more answers

Which subatomic particle has the smallest mass?

spin [16.1K]

Answer:

quark

Explanation:

neutrón= 1.675 x 10-27 kg

proton=1,673 x 10-27 kg

electron=9,11 x 10-31 kg

quark=7,13 - 14,26 · 10−30 kg

3 0

2 years ago

Des Linden won the Boston marathon in 2018, becoming the first American woman to win since 1985. The harsh conditions (heavy rai

ankoles [38]

Answer:

3050.6 Litre .

Explanation:

Total time of heart beat = Total time of race = 2 hrs , 39 minutes and 54 seconds

= 2 x 60 + 39 + 54/60 min

= 120 + 39 + .9 min

= 159.9 min

rate of heart beat = 170 per min

Total no of heart beat during race = 170 x 159.9

volume of blood per kg per beat = 2.5 mL per kg of weight

body weight = 99 pounds = .4535 x 99 kg = 44.89 kg

volume of blood per beat = 2.5 mL x 44.89 mL

= 112.225 mL .

Total required volume of blood = 112.225 x 170 x 159.9 mL

= 3050612 mL

= 3050.6 L.

6 0

3 years ago