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4 years ago

I need this to get a great grade!!!Which choice is not a physical property of matter?

Physics

2 answers:

Verizon [17]4 years ago

7 0

Answer:

A) heat of combustion

Explanation:

Choice A is a chemical property because when something is combusted by heat (such as wood) it can no longer go back to the original state it was at. Hence, once wood is burned into ash, ash cannot be formed back into wood.

Ede4ka [16]4 years ago

3 0

C. boiling point is the correct answer! Please mark brainliest! Have a nice day!

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List three things that can affect an objects resistance.

DENIUS [597]

Answer:

The amount of air resistance an object experiences depends on its speed, its cross-sectional area, its shape and the density of the air.

Explanation:

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3 years ago

Explain how its possible for a compound to have both iconic and covalent bonds.<br><br>Thanks!

Evgesh-ka [11]

The atoms which make up the ion are covalently bonded to one another. 19) It is possible for a compound to possess both ionic and covalent bonding. a. If one of the ions is polyatomic then there will be covalent bonding within it.

3 0

3 years ago

The Sears Tower is nearly 400 m high. How long would it take a steel ball to reach the ground if dropped on the top? What will b

kipiarov [429]

Answers:

a) 9.035 s

b) -88.543 m/s

Explanation:

The described situation is related to vertical motion (especifically free fall) and the equations that will be useful are:

$y=y_{o}+V_{o}t+\frac{1}{2}gt^{2}$ (1)

$V=V_{o}+gt$ (2)

Where:

$y=0$ is the final height of the steel ball

$y_{o}=400 m$ is the initial height of the steel ball

$V_{o}=0$ is the initial velocity of the steel ball (it was dropped)

$V$ is the final velocity of the steel ball

$t$ is the time it takes to the steel ball to reach the ground

$g=-9.8 m/s^{2}$ is the acceleration due to gravity

<u>Knowing this, let's begin with the answers:</u>

<h2>a) Time it takes the steel ball to reach the ground</h2>

We will use equation (1) with the conditions listed above:

$0=y_{o}+\frac{1}{2}gt^{2}$ (3)

Isolating $t$ :

$t=\sqrt{\frac{-2y_{o}}{g}}$ (4)

$t=\sqrt{\frac{-2(400 m)}{-9.8 m/s^{2}}}$ (5)

$t=9.035 s$ (6)

<h2>b) Final velocity of the steel ball</h2>

We will use equation (2) with the conditions explained above and the calculaated time:

$V=gt$ (7)

$V=(-9.8 m/s^{2})(9.035 s)$ (8)

$V=-88.543 m/s$ (9) The negative sign indicates the direction of the velocity is downwards

3 0

3 years ago

Two children of mass 18 kg and 29 kg sit balanced on a seesaw with the pivot point located at the center of the seesaw. If the c

DedPeter [7]

Answer:

3.085 [m].

Explanation:

1) The rule:

m₁*g*l₁=m₂*g*l₂, where m₁ and l₁ - the mass and distance for the small child, m₂ and l₂ - for the big child;

2) according to the condigion l₁+l₂=5, then

3) it is possible to make up the system:

$\left \{ {{l_1+l_2=5} \atop {m_1*l_1=m_2*l_2}} \right. \ = > \ \left \{ {{l_1=5-l_2} \atop {18*(5-l_2)=29*l_2}} \right. \ = > \ \left \{ {{l_1=\frac{145}{47}} \atop {l_2=\frac{90}{47}}} \right.$

4) finally, l₁=145/47≈3.085 [m].

7 0

2 years ago

A 12-kg turtle rests on the bed of a zookeeper's truck, which is traveling down a country road at 62.0 mi/h. The zookeeper spots

Svetlanka [38]

Answer:

0.25683

Explanation:

t = Time taken by the truck to stop = 11 seconds

u = Initial velocity of the truck = 62 mi/h

v = Final velocity of the truck = 0

a = Acceleration of the truck

g = Acceleration due to gravity = 9.81 m/s²

Equation of motion

$v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{0-\frac{62}{2.237}}{11}\\\Rightarrow a=-2.5196\ m/s^2$

$\mu mg=ma\\\Rightarrow \mu=\frac{ma}{mg}\\\Rightarrow \mu=\frac{a}{g}\\\Rightarrow \mu=\frac{2.5196}{9.81}\\\Rightarrow \mu=0.25683$

The minimum coefficient of static friction between the turtle and the truck bed surface needed to prevent the turtle from sliding is 0.25683

6 0

3 years ago