Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance.
Explanation:
Which of the following choices is NOT a common injury in sports?
A.
concussion and muscle strains
B.
hemorrhage and arthritis
C.
ligament sprains and tears
D.
bone fractures and ankle sprains
The choice that is not a common injury in sports is hemorrhage and arthritis. Details about injuries can be found below.
What is sport?Sport is any activity that uses physical exertion or skills competitively under a set of rules that is not based on aesthetics.
Injuries are bound to occur during sporting activities and they are as follows:
ConcussionFracturesLigament sprainsankle sprainsmuscle strainsHemorrhage, which refers to the heavy release of blood within or from the body and arthritis, which is an inflammation of a joint or joints are not common injuries involved in sports.
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Mr. Cudd tries riding a bike to see if he still remembers how. As he gains some speed, he accidentally squeezes the front brakes. What happens immediately after is an example of which one of Newton’s laws?
Answer:
Newton's second Law of motion
Excessive washing of the skin disrupts the natural growth of bacteria on the skin's surface, increasing the
chances of:
Answer:
c infections
Explanation:
Listed in the Item Bank are individual steps that need to be ordered. To find out more information about steps, some have more details
available when you click on them. Drag and drop the steps in the proper order by placing each in its corresponding open rectangle. Be sure
that the earliest step is placed next to the number 1.
Answer:
radio
microwave
Infrared
Visible
Ultraviolet
X-ray
Gamma ray
I hope this helps you a little bit
Which is heavier , a kilogram of lead or a kilogram of a polystyrene beads ?
Answer:
They weight the same, they're both 1 kilogram
The weight of the given objects is the same since they have equal mass.
Weight of object
The weight of an object is the gravitational pull of earth on the object. Weight is vector quantity because it varies from place to place due to difference in acceleration due to gravity.
The weight of 1 kg leadW = mg
W = 1 x 9.8
W = 9.8 N
The weight of 1 kg polystyreneW = mg
W = 1 x 9.8
W = 9.8 N
Thus, the weight of the given objects is the same since they have equal mass.
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Independent practice
1.
a.
2.
Calculate the density p (in kg/m) for each of the following:
m = 10 kg and V=10 m3
b. m = 160 kg and V = 0.1 m3
C. m = 220 kg and V = 0.02 m3
A wooden post has a volume of 0.025 m' and a mass of 20 kg. Calculate its
density in kg/m
Challenge. A rectangular concrete slab is 0.80 m long, 0.60 m wide and 0.04
m thick. |
Calculate its volume in m?,
b. The mass of the concrete slab is 180 kg. Calculate its density in kg/m.
3.
a.
Explanation:
formula: Mass
Density x volume
2a) m=10kg v=0.3m³
10÷0.3=33.3 kg/m
2b) m = 160 kg V=0.1m³
160÷0.1=1600 kg/m
2c) m = 220 kg V = 0.02m³
220÷0.02=11000 kg/m
A wooden post has a volume of 0.025m³ and a mass of 20kg. Calculate its density in kg/m.
density = volume ÷ mass
20÷ 0.025=800 kg/m
Challenge: A rectangular concrete slab is 0.80m long, 0.60 m wide and 0.04m thick. Calculate its volume in m³.
Formula : Length x width x height = Volume
0.80 x 0.60 x 0.04 = 0.0192m³
B) The mass of the concrete slab is 180 kg. Calculate its density in kg/m.
density = volume ÷ mass
180 ÷ 0.0192 = 9375 kg/m
What do the arrows in this photograph represent?
A. Gravity and air resistance
B. An action-reaction force pair
C. A pair of unbalanced forces at work
D. Friction and air resistance
Answer: B An action-reaction force pair
Explanation: Took the exam
The arrows in this photograph represent: An action-reaction force pair. Hence, option (B) is correct.
What is action-reaction force pair?When two bodies interact, they exert an equal and opposite force on one another in accordance with Newton's third law of motion. Action-reaction forces are made up of these forces.
"When one body exerts a force on the other body, the first body experiences a force that is equal in magnitude in the opposite direction of the force which is exerted," according to Newton's third law of motion.
According to the above assertion, there are always two forces operating on the objects involved in an interaction. The forces are of identical magnitude, but the direction of the force acting on the first object is different from the direction acting on the second.
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Do all the stars move in the sky ? Explain
Pretend you are designing your own home. You often get cold in the winter and want to make this house as energy efficient as possible to keep you warm. Use your knowledge about energy transfer and describe at least 3 things you would include in the design of your home. Be sure to explain why you would include these things.
Answer:
I would include extra insulation, a heating system, and some snug-fitting sweaters.
Explanation:
that way i won't get cold
A desk with a mass of 40kg is being pushed across the classroom and it accelerates at a rate of 5m/s squared . What is the force being applied to the desk?
Explain What is electrical energy and why do we need this energy
Answer:
WHAT IS ELECTRICAL ENERGY?Electrical energy is the most convenient form of energy for most human uses. Electrical energy is easy use and move from one location to another, but it is almost impossible to store in any large quantity. It can be used for running computers and most appliances, home heating, and even transportation.ELECTRICITY is used by industry, households, and businesses—accounting for 18% of end use energy worldwide.Electrical energy is very convenient, and as a result more and more of the energy used by a high energy society is in the form of electricity, see figure 1. The rate of electrical energy use is growing faster than the rate of electricity use, see figure 2.WHY DO WE NEED ELECTRICAL ENERGY?Electrical energy is used throughout the world to power devices, appliances and methods of transportation utilized in daily life. To make things operate, electrical energy must be emitted from energy sources such as power plants, to enable an object to consume the power it needs to function.PLS ANSWER FAST WILL GIVE BRAINLY!!!
How can you know if something has energy?
Answer:
You'll see it without noticing
Explanation:
for example: Magnets can pull to one thing, but using the other side of the magnet with the other magnet can push away the magnets, and turn it to their way of pulling, also electricity, movement, were making energy everyday, just by moving
How is a mixture different from a compound?
Answer:
MIXTURE
1 In a mixture two or more substances are mixed together (elements or compounds)
2Therd is no fixed proportion of the constituents
3 The mixture may or may not be homogenous
4 There is no chemical reaction between the constituent substances
5 There cannot be a chemical formula for a mixture
6 Heat or any other type of energy is not required or released during the formation of a mixture
7 The constituents can be separated using simple physical processes
8 The properties of the constituents are retaied
COMPOUND
1 Two or more elements form a compound
2 The constituent elements combine in a definite proportion to form a compound
3 The elements are in a definite proportion in any part or fraction of the compound
4 There is a chemical reaction in the formation of a compound
5 A compound has always a chemical formula for a compound
6 Heat orany other energy is often required for the formation of a compound or released during the formation of a compound
7 The constituent elements can't be separated using simple physical processes in case of a compound
8 The properties of the constituent elements are not retained in the compound
Provide two reasons why is bronze still used in the manufacture of bells?
(NOVA ASSIGNMENT)
Answer:
Bell makers still use bronze because it has desirable properties, such as hardness and sound quality. The atomic structure of a pure metal is orderly and allows electrons to flow freely through the material. In bronze, the addition of tin to copper restricts the movement of the copper atoms.
what is a possible explanation for a set of facts that can be tested by further investigation called?
1. Questions
2. Hypothesis
3. Experiment
4. Summary
Answer:
Hypothesis.
Explanation:
Not a question, not a summary, and not an experiment.
physics help me pleaseee
Answer:
letter e.
Explanation:
because i know its not too deep
If the radius of Earth were one half what it is now, and the mass were the same, what would be the value of g?
Answer:
4 times what it is now.
Explanation:
g=G(M/r^2)
G is constant, so ignore.
We have (1M/0.5r^2), or 4.
Answer:
4g
Explanation:
the equation of g (field gravity)
g = G M/R²
because G (Contant of Gravitasion) and M (Mass of earth) same, them
g2/g1 = R1²/R2²
g1 = g now
g2 = g which the value we looking for
g2/g = 1/(1/2)²
g2/g = 1/(1/4)
g2/g = 4
g2 = 4g
what type of particle carries an electric current through a wire
The Escape speed at the surface of a certain planet is twice that of the earth. If the planet has radius twice of the Earth. what is its mass in unit of earth's mass?
Answer:
1.32 × 1022 short tons
Explanation:
hope this helps
The required mass of the planet is 8 times the mass of the earth.
Given that,
The Escape speed at the surface of a certain planet is twice that of the earth. The planet has a radius twice of the Earth. what is its mass in unit of earth's mass is to be determined.
An object with this velocity at the earth's surface will completely escape the earth's gravitational field, even after accounting for atmospheric losses.
here,
The escape velocity of the planet = 2 Escape velocity of the earth
[tex]\sqrt{{2GM_p}/r_p} = 2\sqrt{2GM_e/r_e}[/tex]
Substitute the values and square both sides,
[tex]{{2GM_p}/2r_e} = 4*{2GM_e/r_e}\\M_p = 8M_e[/tex]
Thus, the required mass of the planet is 8 times the mass of the earth.
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Please help this is really confusing
As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?
It is increased.
It is conserved.
It is decreased.
It is created.
Answer:
B..it is conserved
Explanation:
Investigation to find out relationship between the current in the coil and the force on the iron disc
Answer:
Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet.
Explanation:
Plz help me with this question ASAP
ok i dont know to be honest
A canoe moving down the river with a kinetic energy of 5J and a speed of 0.5m/s. What’s the mass of the canoe
What is the first step in cell division?
Daughter cells create copies of their components.
Daughter cells grow in an unregulated fashion.
Parent cells are created from daughter cells that split.
Parent cells create copies of their components.
Answer:
d
Explanation:
Answer:
D.)
Parent cells create copies of their components.
Explanation:
edge2021
Please help, is an electric lamp a luminous object?
Question 1 of 14 Which of the following statements describes a perfectly inelastic collision? O A. An ice hockey player picks up a trophy as he slides past it. O B. A baseball bat hits a baseball into the outfield. O C. A surfer falls off of his surfboard when a wave hits him. D. Two birds collide in midair and fly off in different directions.
Answer: A. An ice hockey player picks up a trophy as he slides past it
Explanation:
A PE X
The statement that best describes a perfectly inelastic collision is
C. A surfer falls off of his surfboard when a wave hits him.
What is collision?A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-
1. Elastic collision
2. Inelastic collision
3. Perfectly inelastic collision.
In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions
What is elastic collisionAn elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.
What is inelastic collision ?In inelastic collision there is a loss of kinetic energy and coefficient of restitution is less than one.
What is perfectly inelastic collision?In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity
What is coefficient of restitution ?Coefficient of restitution is the ratio of relative velocity of separation after collision to relative velocity of approach before collision.
A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .
So when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.
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Which of the following materials does not experience any force when it is brought near a magnet?
1) Iron
2) Silk
3) Steel
4) Cobalt
Please fast, I need help.
Answer:
silk , it is a type of fibre
A body accelerates uniformly from rest at 2ms² for 5 seconds . calculate its average velocity in this time.
Answer:
0.4
Explanation:
average velocity =d/t
2/5=0.4
0.4m
A power source of 6.0 V is attached to the ends of a
capacitor. The charge is 12 C.