An unknown substance is tested and found to have the following physical properties: brittle fair conductor of electricity dull (not shiny) The substance is most likely a _____. metal metalloid nonmetal cannot be determined without more data
Answer:
Metalloid
Explanation:
Metals are good conductors of electricity and are generally shiny.
Metalloids are the elements of the periodic table that have properties of both metals and non metals. They may be shiny or dull. They are brittle and are fair conductors of electricity.
Non metals are dull, do not conduct electricity and brittle.
Hence the substance is most likely a metalloid.
The volume of a ball was measured at 500.0 cm3, and then mass was measured on this triple beam balance. what would be the most accurate reading for the mass of the ball? g using this mass, what would be the most accurate calculation of density for the ball? g/cm3
We have that the mass and density are
[tex]m=404.2 g[/tex]
[tex]\rho=0.8084g/cm^3[/tex]
From the Question we are told that
The volume of a ball was measured at 500.0 cm3,
We have that if we are to measure a volume of 500cm^3 we have
mass [tex]m=404.2 g[/tex]
to find Density
[tex]\rho=\frac{m}{v}\\\\\rho=\frac{404.2}{500}[/tex]
[tex]\rho=0.8084g/cm^3[/tex]
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Explain why liquids solidify when they are cooled.
When Edmund Halley visited Newton to ask him about orbits, what shape did Newton tell him orbits must have ?
Which of the following materials has the highest tensile strength?
spider silk
copper
glass
plastic
Choose if the quantity indicated is a vector or a scalar. Quantity: the number of coins in a piggy bank Type of quantity:
Scalars and vectors are different types of physical quantities, with scalars having only magnitude while vectors have magnitude and direction.
Scalars are physical quantities that have only a number value or magnitude, whereas vectors require both magnitude and direction. The number of coins in a piggy bank is a scalar quantity because it only represents the amount without any directional information.
_________ is amount of “ground” an object moves from its starting point and __________ is how much “ground” and object covers in total.
Question options:
Displacement, distance
Speed, displacement
Distance, displacement
Movement, distance
I believe the question talks about displacement and distance. The difference of the two is that displacement is the linear distance or shortest distance drawn from the starting point until the final point while distance is the whole trip that is covered, so the answer is:
Displacement, distance
The correct answer is C.
A student arranged the four cards sequentially in a row on the basis of the periods when these events occurred. The card showing the earliest event was placed on the extreme left. Which of these cards was placed third in the row?
Anything that can make an object with mass move is called (2 points)
mass
weight
density
force
Answer:
D (force )
Explanation:
Describe two ways that radio waves and gamma rays are alike and how they are different
The force of gravity follows an inverse square law, meaning that the strength of the force declines with the square of the distance between two masses. but if the distances between pairs of objects are all the same, as in part a, then the strength of gravity depends only on
in an experiment researchers want to determine if the _____ Variable causes change in _____ variable
a) dependent , independent
b) confounding, independent
c) independent, dependent
d) dependent, extraneous
Answer: c). independent, dependent
Explanation:
An independent variable can be define as the variable which can be changed in an experiment. It can be manipulated manually. The effect of such alteration and manipulation can be observed on the dependent variable.
The dependent variable is the one which changes due to the changes and alteration done by the experimenter on the independent variable.
How does a radio station know how many listeners?
0.403 L is equal to:
4.03 mL
40.3 mL
403 mL
4,030 mL
Answer:
0.403 mL = 403 L
Explanation:
In this question, it is required to convert 0.403 litres to millilitres. We know that the conversion from L to mL is as follows :
1 litre = 1000 millilitres
For converting 0.403 L to ml we need to use above relation.
0.403 L is equal to 0.403 multiplied by 1000 so that we get 403 mL.
So, the correct option is (c) ''403 mL''. Hence, this is the required solution.
Why is gold often found in a pure form in nature
How far is Mercury from the Sun?
Of the eight planets, Mercury is the planet closest to the sun. It is about 36 million miles away from the sun. During the day it is extremely hot. During the night it is bitter cold because Mercury doesn't have any atmosphere to keep its heat from escaping.
Atmosphere - Layer of air.
An object is raised above the ground gaining a certain amount of potential energy. if the same object is raised twice as high, it gains:
If the same object is raised twice as high, it gains: double the potential energy.
Potential energy (P.E) can be defined as a type of energy possessed by an object (body) as a result of its position (height) above the earth. Thus, potential energy (P.E) is highly dependent on the height above the ground.
Mathematically, potential energy (P.E) is calculated by using the following formula:
[tex]Potential \;energy (P.E) = mgh[/tex]
Where:
m is the mass of object.g is the acceleration due to gravity.h is the height of an object.Since the height of the object is raised twice as high, it simply means the value of height (h) would be multiplied by two (2) and the potential energy (P.E) would double:
[tex]Height = 2[/tex] × [tex]height[/tex]
[tex]P.E = 2(mgh)[/tex]
In conclusion, raising the same object is raised twice as high, would cause the potential energy (P.E) to double (twice as much as the initial value).
Describe 4 common workplace practices that are risk factors for injury
A container full of mercury weighs 1000g. the empty container weighs 320 g. the density of the mercury is 13.6 g? cm3. what is the volume of the box ?
Non metals are good conductors of heat and electricity true or false
A solid object has a density of 0.75 g/mL, in which liquid(s) will it sink? SUPPORT your answer.
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Name three situations in which force is created. Describe the cause the cause of the force in each situation.
How are the functions of the cytoskeleton and the cell wall similar
Describe how the motions of the particles that make up an object change when the object's change when the object's temperature increases.
When temperature of the object's change, the motion of its particles also change.
Kinetic energy of the constituent particles increased, when temperature is increased, and vise versa.
It is because as temperature increased, the particles get energy and start moving.
Therefore, when temperature of the object's change, the motion of its particles also change.
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The motions of the particles that make up an object change when the object's temperature increases. Because if the object's temperature increases, the particles begin to move faster so the kinetic energy of the particles can go really fast, while the potential energy particles only increase when they go further apart.
Which example best represents an object with balanced forces acting upon it? A) A boat moving through the water. B) A book sitting on a high shelf. C) A wagon rolling down a steep hill. D) A baseball thrown thrown in the air.
An example that best represents an object with balanced forces acting upon it is a book sitting on a high shelf. Thus, the correct option for this question is B.
What do you mean by Force?Force may be defined as the process of pushing and pulling an object with an actual mass that stimulates its velocity to be changed. It is a type of vector quantity because it has both magnitude and direction.
It is the simple and fundamental concept of physics that when two or more objects are interacting with one another but do stimulate any change in their position.
The principle is applied in this question where a book is exerting pressure in a downward direction while a shelf is exerting pressure in an upward direction and resulting in an equal and opposite force.
Therefore, a book sitting on a high shelf is an example that represents an object with balanced forces acting upon it. Thus, the correct option for this question is B.
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Use the facts below to answer the question: Who reaches One-Eyed Willie’s pirate ship first?
Support your answer with a calculation for each fact.
Fact 1: The Goonies travel 1000m south and then 1200m west to reach One-Eyed Willie’s pirate ship. (Hint: Orange on map) (Lesson 2.16)
Fact 2: Sloth travels the direct route from Goonies to One – Eyed Willie’s pirate ship. (Hint: Blue on map) (Lesson 2.16)
Fact 3: The Goonies start from rest and accelerate at 0.03 m/s2 until they reach the pirate ship. (Lesson 2.19)
Fact 4: Sloth travels at a constant speed of 3m/s. (Lesson 2.01)
If you get stuck with any of these facts, do what you can and also be sure to review the vocabulary and motion graphs!
A person is able to pull a rope with a force of 700 N. What is the minimum number of fixed and moveable pulleys that the person will require to lift up a 27,800 N elephant? Assume the pulleys themselves are weightless and the system has 100% efficiency.
Each pulley reduces the extra effort compulsory to lift the
elephant (light and 100% efficiency). If the elephant "weighs" 27,800
N and the person can apply 700 N,
27,800 / 700 = 39.7 which is about 40 N.
The answer that offers a combined # of 40 pulleys is computed by:
40 / 2 = 20
Therefore the answer is 20 fixed and 20 moveable.
best describes an applied force?
A boat is heading across a river at a velocity of 25 mph. The river is flowing downstream at 10 mph. What is the actual velocity of the boat?
The actual velocity of the boat is 26.6 mph, at an angle of 18.4° to a line drawn across the river.
Explanation:The actual velocity of the boat is the resultant velocity of the boat's velocity and the river's velocity. To find the actual velocity, we need to add the vectors representing the boat's velocity and the river's velocity. Since the boat is heading across the river, its velocity is perpendicular to the river's velocity. Using vector addition, we can find that the boat's actual velocity is 26.6 mph at an angle of 18.4° to a line drawn across the river.
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The actual velocity of the boat is determined by the vector sum of the boat's velocity and the flow of the river. This is calculated by finding the hypotenuse of a right angled triangle where one side is the velocity of the river and the other side is the velocity of the boat. The total velocity will be at an angle less than 45 degrees relative to the shore.
Explanation:To find the actual velocity of the boat, we need to consider both the boat's velocity and the river's downstream velocity. This is a concept known as relative velocity. In our case, the boat is trying to head straight across a river, similar to what is depicted in Figure 3.44. However, given the downstream flow of the river, the boat will actually move diagonally relative to the shore.
Since the river's current will affect the boat's movement, we will calculate the resultant velocity by using vector addition. In a coordinate system where the x-axis is parallel to the velocity of the river, and the y-axis is parallel to the velocity of the boat, the total velocity can be obtained via the Pythagorean theorem:
tot = √ ((25 mph)² + (10 mph)²)
Given that the speed of the river and the boat are not equal, the total velocity direction will be at an angle less than 45 degrees with respect to the shore or X-axis.
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Which type of environmental science career involves collecting information about how human events impact the environment?
a.Environmental journalistb.Environmental physicianc.Environmental engineerd.Environmental designer
Answer: Environmental engineer
Explanation:
Environmental engineering can be defined as the area where impact of human activities on environment takes place.
Human activities as mining, deforestation, building dams has huge impact on the environment.
This is studied under environmental engineering. This subject also allows to find solution for the problems associated with the impact of human activities on environment.