Answer:
Mass is the quantity of substance in an object
A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Which statement
correctly describes the momentum of the rubber ball?
a. Its magnitude increased and its direction changed.
b. Its magnitude increased but its direction remained the same.
c. Its magnitude remained the same but its direction changed.
d. Its magnitude and its direction both remained the same.
Answer:
d. Its magnitude and its direction both remained the same.
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
The law of conservation of momentum states that the total linear momentum of any closed system would always remain constant with respect to time.
This ultimately implies that, the law of conservation of momentum states that if objects exert forces only on each other, their total momentum is conserved.
In this scenario, a rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Thus, the statement which correctly describes the momentum of the rubber ball is that its magnitude and its direction both remained the same because its velocity didn't change while returning to the thrower.
The correct statement should be "Its magnitude remained the same but its direction changed". Option C is correct.
Given information:
A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s.
Now, the mass of the ball doesn't change and the magnitude of the velocity is also the same.
Momentum can be defined as the product of mass and velocity. It is a vector quantity because velocity is also a vector quantity, and it has magnitude and direction.
Now, the magnitude of momentum will be the same because mass and velocity don't change in magnitude.
The direction of velocity will be reversed. So, the direction of momentum will also be reversed.
Therefore, the correct statement should be "Its magnitude remained the same but its direction changed". Option C is correct.
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1 point
Question 11
A swimmer feels cold after leaving warm water on a warm, windy day.
Why does she feel cold even though the air is warm?
A. The less energetic water molecules on her skin escape quickly.
B. The more energetic water molecules on her skin do not escape quickly.
С The water on her skin does not evaporate quickly enough to keep her warm.
D. The water on her skin evaporates quickly and cools her skin.
Answer:
D. The water on her skin evaporates quickly and cools her skin.
Explanation:
Train A leaves the station heading north at 80 mph. At the same time and from the same station, Train B heads south 65 mph. How far apart are the trains after 3 hours fo travel?
Answer:
The trains will be 435 miles apart
Explanation:
Distance covered by the two trains can be obtained by multiplying their speeds with the time frame under consideration - in this our case, it is 3hours.
For Train A
Distance covered = 80mph X 3 hours = 240miles
For train B
Distance covered = 65mph X 3 hours = 195 miles.
The total distance between the two trains after 3 hours will be
240 + 195 = 435 miles
Question 1
Ricardo came up with three different designs for paper airplanes. He would like to find out which design flies the farthest. Ricardo plans to fly each paper airplane five times. What step should Ricardo take after he flies each plane?
Answer:
B. measure the distance that the plane flew and record it
Explanation:
Correct the following statement:
Wind is caused by the revolution of the Earth around the Sun.
O Wind is caused by the rotation of the Earth.
O Wind is caused by the differences in air pressure on Earth's surface.
This statement is already correct.
O Wind is caused by the greenhouse effect.
Answer:
It's the 3rd option
Explanation:
Wind is caused by the differences in air pressure on Earth's surface.
In what do electromagnetic waves cause disturbances when they transfer
energy?
A. Electric fields only
O B. Both electric and magnetic fields
C. Neither electric nor magnetic fields
O D. Magnetic fields only
A snowflake falls from a cloud that is 500 m above the ground. It hits the ground after
being pulled down due to the acceleration of gravity (-10 m/s2). How fast will it be
going as it hits the ground?
Answer:
i wabnt the points lol
Explanation:
How can you defined work done in term of kinetic energy, potential energy, and the force?
Please help!!!!!!!!
Answer:
Option C. 83.8 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) of object = 2 Kg
Velocity (v) of the object = 5 m/s
Height (h) = 3 m
Mechanical energy =.?
Next, we shall determine the kinetic energy of the object. This can be obtained as shown below:
Mass (m) of object = 2 Kg
Velocity (v) of the object = 5 m/s
Kinetic energy (KE) =?
KE = ½mv²
KE = ½ × 2 × 5²
KE = 1 × 25
KE = 25 J
Next, we shall determine the potential energy of the object. This can be obtained as shown below:
Mass (m) of object = 2 Kg
Height (h) = 3 m
Acceleration due to gravity (g) = 9.8 m/s²
Potential energy (PE) =.?
PE = mgh
PE = 2 × 9.8 × 3
PE = 58.8 J
Finally, we shall determine the mechanical energy of the object. This can be obtained as shown below:
Kinetic energy (KE) = 25 J
Potential energy (PE) = 58.8 J
Mechanical energy =?
Mechanical energy = KE + PE
Mechanical energy = 25 + 58.8
Mechanical energy = 83.8 J
i have finals! pls help
(2). a = v/t
but v =s/t
a =s/t÷t
a=s/t×t
a=s/t²
a=220/5.21²
a=8.10m/s²
Explanation:
For the question 1, just imput the value of t into the equation
How are gamma rays used for communication?
Answer:
No
Explanation:
Electromagnetic radiation is used for communications and transmission of information. The waves that are used in this way are radio waves, microwaves, infrared radiation and light.
The current in the wires of a circuit is 60.0 milliAmps. If the
voltage impressed across the ends of the circuit were
doubled and the resistance were tripled, then its new current
would be ___ milliAmps.
Answer:
I' = 40 mA
Explanation:
Given that,
The current in the wires of a circuit is 60.0 mA.
If the voltage impressed across the ends of the circuit were doubled and the resistance were tripled such that,
V' = 2V and R'=3R
The relation between current, voltage and resistance is given by :
V = IR
Let I' be the new current. So,
V'=I'R'
⇒ [tex]I'=\dfrac{V'}{R'}\\\\I'=\dfrac{2V}{3R}\\\\I'=\dfrac{2}{3}\times \dfrac{V}{R}\\\\I'=\dfrac{2}{3}\times I\\\\I'=\dfrac{2}{3}\times 60\\\\I'=40\ mA[/tex]
So, the new current would be 40 mA.
What will happen when two neutral objects are rubbed together?
Answer:
I hope this will help you
Explanation:
When two neutral objects come into contact--especially in a dry environment--electrons can be knocked loose from one object and picked up by the other. The object that gains electrons becomes negatively charged, while the object that loses electrons becomes positively charged. Objects with like charges repel each other, while those with opposite charges attract each other. This phenomenon--in which objects acquire an electric charge and exert a force on one another--is what we call static electricity.
Light my fire! Mix me with cerium and we’ll make beautiful mischmetal together!
create a formula giving the strength of the induced field (B) i terms of current (I) and the distance from the wire to the probe (d)
Why would geothermal energy NOT be a possible energy source for many regions of the country?
A. Geothermal energy depends upon a nonrenewable resource.
B. Geothermal energy is only found in Arctic regions.
C. Geothermal energy is not always found in an area that is easily accessible.
D. Geothermal energy can only be used to grow tropical fruits.
Geothermal energy is not always found in an area that is easily accessible. (C)
Geothermal energy is not a possible energy source for many regions of the country. Because geothermal energy is not always found in an area that is easily accessible. Option C is correct.
What is geothermal energy?Geothermal energy is the thermal energy in the Earth's crust that comes from the planet's creation and the radioactive decay of components in nearly equal amounts.
The disadvantage of using the geothermal energy is;
A. It is available only in limited areas.
B. It can cause air and groundwater pollution.
C. It is difficult to transport from place to place.
Geothermal energy is not a possible energy source for many regions of the country . Because geothermal energy is not always found in an area that is easily accessible.
Hence, option C is correct.
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A box weighs 25N. How much mass does it have?
Explanation:
If box weight 25N on ground
MA=F
M(10)=25
M=2.5Kg
Help! y’all get brainliest
Answer:
True
Explanation:
Dietary fiber contains an indigestible material known as cellulite. This is false statement.
What is Dietary fiber?Plant substances that are not broken down by human digestive enzymes are referred to as dietary fiber.
Only lignin and a few polysaccharides were recognized as meeting this criterion in the late 20th century, but resistant starch and oligosaccharides were listed as dietary fiber components in the early 21st century.
The phrase "all polysaccharides and lignin, which are not digested by the endogenous secretion of the human digestive tract" is commonly used to define dietary fiber.
At the moment, the majority of animal nutritionists either use a physiological definition, which states that "dietary components resistant to breakdown by mammalian enzymes," or a chemical definition, which states that "the sum of non-starch polysaccharides (NSP) and lignin."
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(answer fast and correctly and i will give you brainiest and 5 star's. )
The law of conservation of energy states:
Energy increases exponentially with time
Total energy decreases due to energy output.
Energy cannot be created or destroyed.
Energy always remains in the same form.
Answer:
Energy cannot be created or destroyed.
Explanation:
its in the name, law of "conservation" of energy. energy can only change forms not be destroyed
Answer: Energy cannot be created or destroyed.
Explanation: The law of conservation of energy states that energy can neither be created nor be destroyed due to energy loss. It can only change its states from one energy state to another.
The efficiency is defined as the ratio of output work to the input work. The efficiency of the fan is not 100%. Because some of the energy is lost in the form of heat and sound. No machine is 100% efficient. There is always some loss of energy takes place.
I really hope this helps and sorry it's late.
Which of the following best completes the sentence for Newton's Third Law? In every interaction,
forces occur in
A. specific places
B. single units
C. one direction only
D. pairs
Answer:
D in pairs
Explanation:
Forces always come in pairs - equal and opposite action-reaction force pairs.
What has more kinetic energy 15 kg ball rolling north at 15 m/s or a 15 kg ball rolling backwards at 7m/s
Answer:
15 kg ball
Explanation:
The first mineral to melt from a rock is
Answer:
Quartz
Explanation:
Answer:
Quartz
Explanation:
The temperature must be high enough to melt at least some minerals in the rock. The first mineral to melt from a rock will be quartz
How much work is done when a porcelain vase with mass of 2.5 kg is lifted up 3 m to a shelf? (HINT- Weight can be used as Force when the motion is up/down).
Whether or not the information on an online source is credible and factual, is up to the user to decide. Please select the best answer from the choices provided T F
Answer:
this statement is True
Explanation:
Deciding whether an information is credible or factual from an online source is up to the user: True
Meaning of Information and factual information
Information can be defined as facts given or acquired through learning about a topic.
Information can also be said to mean a processed data.
Factual or credible information is an information that deals with only facts. this type of information do not deal with predictions or assumptions, but rather they state fact.
In conclusion, In Deciding whether an information is credible or factual from an online source, it is True that it is up to the user
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what physical properties does krypton have
Answer:
Image result for what physical properties does krypton have
Krypton is a colorless, odorless gas. It has a boiling point of -152.9°C (-243.2°F) and a density of 3.64 grams per liter. That makes krypton about 2.8 times as dense as air.
Explanation:
. ........... is a mirror with a flat reflecting surface and is made of ordinary glass.
Answer:
Plane mirror.
Explanation:
A plain mirror is a mirror with a flat reflecting surface and is made of ordinary glass.
Reflection can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.
Simply stated, reflection occurs when a ray of light or wavefronts bounces off a smooth surface such as a plane mirror.
Generally, the angle of reflection equals the angle of incidence when a light ray strikes or hits a plane mirror.
The properties or characteristics of the images formed by a plane mirror include;
I. They are virtual and erect (upright).
II. It is the same size as the object formed.
III. It has the same distance from the plane mirror as the distance of the object from the mirror.
Find the gravitational force between Venus (4.87 x 1024 kg) and
the sun (1.989 x 100 kg). Venus orbits at a distance of
1.082 x 10" m.
The gravitational force between Venus and the Sun, seperated at the distance of 1.082×10¹¹ m is 5.520×10²² N.
What is gravitational force?Gravitational force is the attractive force between two bodies. It is applicable to all the bodies have masses and it is called as Universal law of gravitation.
Grarvitational force is the attractive force is directly proportional to the product of two masses and is inversely proportional to the square of distance between them.
F ∝ m₁ × m₂ / d², m₁ and m₂ is the mass of two bodies and d² is the distance between two bodies. The SI unit of mass is kg and SI unit of distance is m. The SI unit of force is newton.
From the gravitational force,
F = G (m₁×m₂ / d²)
G represents gravitational constant and is equal to 6.67× 10⁻¹¹ N.m²/kg².
From the given,
m₁ ( mass of venus ) = 4.87 x 10²⁴kg
m₂ ( mass of sun) = 1.989 x 10³⁰ kg
d² ( distance between sun and venus) = 1.082 x 10¹¹ m.
G = 6.67 ×10⁻¹¹ N.m² / kg²
F = G (m₁×m₂ / d²)
= 6.67 ×10⁻¹¹ × 4.87 x 10²⁴× 1.989 x 10³⁰ / (1.082 x 10¹¹)²
= 5.520 × 10²² N
The gravitational force between the venus and sun at the distance of 1.082 x 10¹¹ is 5.520× 10²² N.
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HELP ME PLEASE I need the answer now and I will give all my brain lists
Answer:
I'd say it's B
Sorry if I get you wrong-
plaque contains billions of bacteria true or false
Answer:
true
Explanation:
Answer: True
Explanation:
True or false
A nucleotide is make of a sugar, a phosphate, and a base.
Answer:
True
Explanation: