Answer:
C
Explanation:
12+-7=/=-12-7
12+-7=5
-12-7=-19
Answer:
the answer is c
Explanation:
a 0.15 kg baseball has a momentum of 0.78 kg*m/s just before it lands on the ground. What was the ball's speed just before landing?
The speed of the ball (i.e the velocity since it has a direction in a specified time) is 5.2 m/s before it landed.
From the given information,
the mass of the baseball = 0.15 kgthe momentum of the baseball = 0.78 kg m/sFor an object moving in a direction in a specified time, the momentum of the object is usually directly proportional to the mass and velocity.
∴
Momentum = mass × velocity
velocity = momentum/mass
velocity = 0.78 kgm/s ÷ 0.15 kg
velocity = 5.2 m/s
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you went to move a 41 kg bookcase to a different place in the living room. if you push with a force of 65 N and the bookcase accelerates at 0.12 m/s2 what is the coefficient of kinetic friction between the bookcase and the carpet?
Answer:
the force of friction = fk = (uk)n = 402(uk)
the net force acting to accelerate bookcase = ma = (41)(0.12) = 4.9 N
the {assumed horizontal} push force = 65 N
so
65 - fk = 4.9
fk = 65 - 4.9 = 60 N
uk = 60/402 = 0.15 <= ANS
help asap pls and thank you
1. James Naismith
2. 1891
3. City College of New York
17) PLZ HELP MEEE ASAP
i need help asap
Answer:
answer c because it is over halfway in the shade as you can see rn it is halfway showing moon and not so after it will be the after pic of c.
Explanation:
Answer:
It's A or C
Explanation:
Anatomy & physiology
Helllp please!!!!
The statement that is false when describing serous and mucous membranes is that serous membrane always, while mucous membranes always produce mucose fluid.
What is the difference between serous and mucous membranes?Serous membranes usually line closed cavities within the body, for example, the pericardial cavity. These membranes secrete a serous or watery fluid.
On the other hand, mucous membranes are thicker, and the line surfaces of the body are exposed to the external environment, for example, the respiratory tract. These membranes secret mucus but sometimes they can secret liquids, an example is the conjunctiva.
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I don't know if I am right or wrong
How does the average speed of the atoms in a substance compare to the average speed of the atoms in a substance with a lower temperature?
Answer:
yes it does
Explanation:
How can you increase the rate of a reaction? Select all that apply. *
Introduce a catalyst
Increase temperature
Increase the concentration of products
Decrease concentration of reactants
Answer:
- Increase the concentration of the reactants
-increase the temperature
- introduce a catalyst
The rate of reaction is increased by:-
Increase the concentration of the reactantsincrease the temperatureintroduce a catalyst.What is the rate of reaction?The speed at which a chemical reaction occurs is known as the reaction rate or rate of reaction. It is proportional to the rise in product concentration per unit of time and the fall in reactant concentration per unit of time. Reaction times can differ wildly.
A chemical reaction is a procedure that causes one group of chemical substances to change chemically into another.
The rate of a chemical reaction can be increased by Increasing the concentration of the reactant by increasing the temperature and by introducing a catalyst.
Therefore, the rate of reaction can be increased by doing the actions explained above in the answer.
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A rocket burns fuel at a rate of 249 kg/s and exhausts the gas at a relative speed of 2 km/s. Find the thrust of the rocket. Answer in units of MN.
ILL GIVE BRAINLYIST!!
If earth receives more energy than it spends back to space, what can we expect to happen?
A ) The temperature on earth will decrease
B ) The temperature on earth will increase
C ) The temperature on earth will stay the same.
D ) earths energy budget will be balanced.
2. If a earth receives more energy than it emits, what would you expect to happen
A ) The temperature on earth will decrease
B ) The temperature on earth will increase
C ) The temperature on earth will stay the same.
D ) earths energy budget will be balanced.
ANSWER : A.. The temperature on earth will decrease
Is Earth's mantle denser than the crust? PLS HURRY
The mantle, which contains more iron, magnesium, and calcium than the crust, is hotter and denser
Explanation:
because temperature and pressure inside the Earth increase with depth
An atom of nitrogen contains seven electrons. Describe the number of
electrons in each energy level in an atom of nitrogen.
Answer:
Two of the electrons are in the first energy level while the other five are in the second energy level.
Explanation:
.
An atom of nitrogen has 2 electrons in first energy level and 5 electrons in second energy level.
What is an energy level?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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I don't know if I am right so if I am not right can you plz help me
What is the role of the nervous system?
Which parts of the body make up the central nervous system?
Name the two main categories of the nervous system.
How do the muscular, skeletal, and nervous systems work together to maintain homeostasis?
What do sensory neurons do?
What do motor neurons do?
Nervous System Video: Please answer each question by filling in the blanks, using the words from the bank below.
Word Bank: brain, instincts, interpreted, organs, reflexes, spinal cord, senses
The central nervous system includes the _______ and _______.
Signals from _______ and the body's _______ are received by the brain and the spinal cord.
Once signals are processed and _______ by the central nervous system, a response is sent back to the body.
A central nervous system is also responsible for programming _______ and _______.
Paraplegic Will Walk Again with Exoskeleton at the World Cup Video:
What animal did scientists study to create the brain–machine interface?
What does the exoskeleton use to power its movements?
What is the importance of this research?
Why are ORGANS classified?
Answer:
An organ is a group of tissues with similar functions. ...
A given organ's tissues can be broadly categorized as parenchyma, the tissue peculiar to (or at least archetypal of) the organ and that does the organ's specialized job, and stroma, the tissues with supportive, structural, connective, or ancillary functions.
Explanation:
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True of false: Radiant energy reaches the earth in the from of both visible and invisible electromagnetic waves.
Answer:
TRUE OR FALSE : ) IT'S TRUE
EXPLAIN:
Radiation
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat. Radiant energy spreads out from its source in all directions. ... GAMMA RAYS have more energy than XRAYS, Radio waves, microwaves and ultraviolet waves all have longer wavelengths than visible light. Both X rays and gamma rays have higher frequencies than ultraviolet rays.
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An astronaut floating in space throws a wrench forward with the force of 10 N.
How much force does the wrench apply to the astronaut?
A. greater than 10 N
B. less than 10 N
C. zero; the wrench does not apply a force
D. exactly 10 N
The wrench applies greater than 10 N force to the astronaut. The correct option is A.
What is Newton's third law of motion?Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
When the astronaut throws the wrench forward with a force of 10 N, the wrench will apply an equal and opposite force of 10 N to the astronaut in the opposite direction.
Here other options are,
Option B. Less than 10 N is not true because the force applied by the wrench to the astronaut is equal and opposite to the force applied by the astronaut to the wrench, which is 10 N.
Option C. zero; the wrench does not apply a force is not true because the wrench is exerting a force on the astronaut in the opposite direction to the direction in which the wrench is thrown.
Option D. exactly 10 N is not true because the force applied by the wrench to the astronaut is equal and opposite to the force applied by the astronaut to the wrench, which is 10 N, and the two forces act in opposite directions.
Therefore, the force applied by the wrench to the astronaut is greater than 10 N.
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When a car suddenly stops at a red light, a book lying on the car seat slides forward. Why does the book continue to move forward?
A: The car moves in reverse more rapidly than the book.
B: The friction of braking transfers energy to the book
C: The book’s inertia causes it to continue moving
Answer:
C
Explanation:
The answer is c because Newton’s third law states “ for every action there is an equal and opposite reaction.” Since the car quit moving the book did not stay at rest because there was a reaction.
Answer:
C
Explanation:
Newton's 1st law of motions states : " Intertia: A objects resistance to change. More mass= more intertia. Less mass= Less intertia.
it ALSO states that an object at rest will stay at rest, until an outside forces acts upon the object, forming an unbalanced force.
The car stopping suddenly is the outside force, and the book sliding forward is the intertia to change.
What is an example of an electromagnetic wave? Select all that apply. *
gamma ray
ocean wave
light from a lamp
microwave
slinky falling down the stairs
seismic wave
siren on a fire truck
Answer:
A gamma ray, light from a lamp, and a microwave are examples of electromagnetic radiation.
Explanation:
Gamma radiation, visible light (light from a lamp), and microwaves are all apart of the electromagnetic spectrum.
What type of device is a coal-fired power plant?
A. A heat pump that uses heat to do work
B. A heat pump that uses work to move heat
C. A heat engine that uses work to move heat
D. A heat engine that uses heat to do work
A coal-fired power plant is a type of heat engine that uses heat to do work. So, the correct option is D.
What is meant by a power plant ?A power plant or power station is defined as a facility designed for producing electrical energy from various other forms of energy.
Here,
A coal-fired power plant is a type of power plant, which is used for the production of electricity by using fuels such as coal, oil, etc.
The coal-fired power plants are the most common type of power station. In these power plants, the main burning materials used are the fossil fuels. The coal is pulverized and then burned into a coal-fired boiler. Then, the boiler water is converted into steam using a heat engine. As a result, this steam is used for the spinning of turbines.
Hence,
A coal-fired power plant is a type of heat engine that uses heat to do work.
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PLEASE HELP! ILL GIVE BRAINLY!!
If earth receives more energy than it spends back to space, what can we expect to happen?
A ) The temperature on earth will increase.
B ) The temperature on earth will increase.
C ) The temperature on earth will stay the same.
D ) Earth’s energy budget will be balanced.
What do organisms need in order to reproduce? This is Science Btw
Answer:
Energy. They need energy.
Explanation:
4) i dont know if i am right so if I am not plz help me out HELP ASAP I NEED HELP
Answer:
The moon gets less light from the sun
Explanation:
As you see in the diagram the moon is moving farther away from the sun that means it's moving into the earth shadow.
A cyclist turns a corner with a radius of 50m at a speed of 10m/s. What is the cyclist's acceleration?
Answer:
2 m/s^2
Explanation:
a = v^2/r
a = (10m/s)^2 / 50m
a = 2 m/s^2
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Leave a like and mark brainliest if this helped
A cyclist turns a corner with a radius of 50m at a speed of 10m/s. The cyclist's acceleration is 2 m/s².
What is acceleration?The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration. The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.
a = v²/r
a = (10m/s)² / 50m
a = 2 m/s²
A cyclist turns a corner with a radius of 50m at a speed of 10m/s. The cyclist's acceleration is 2 m/s².
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help with 3 and check the other ones please :(
What behavior of light proves that it is a wave? Hint: will this ONLY happen because light is a wave, or could it also be true of fast moving particles? Select all that apply. *
Interference between two or more light waves
Reflection of light
Absorption of light
Redshift and blueshift
Help with 3 and check the other ones please :(
Answer:
number 3 The wind because the wind has strong pressure which causes to change peoples directions in where they are going
Explanation:
hope this helped by the way i think you answered b and 4 i don't know if this is a test and i sent this at the wrong time :(
Why is pH so important to maintain life?
A small change in pH in the ocean can be very harmful to sea life
Human blood is kept at a constant pH otherwise we would die
The pH of soil is very important for plant to be able to grown in it
Or all the above
2 Physic Questions For 20 Points ✨
1. Pick a planet (other than Earth) and describe 5 characteristics that you know about it. Be as specific as possible.
2. What are various features of the moon and how did they form?
All answers need an explanation
Sometimes people refer to Mars as the Red Planet. Because of the rusty iron in the earth, it is red. Mars features weather, polar ice caps, canyons, volcanoes, and seasons just like Earth. Its atmosphere, which is composed of carbon dioxide, nitrogen, and argon, is extremely thin. These define Mars' characteristics.
These are some of the characteristics of the moon, which is the only natural satellite of Earth and the nearest huge celestial body. It is a spherical rocky body that revolves around Earth in a somewhat eccentric orbit at a mean distance of around 384,000 km (238,600 miles), perhaps with a tiny metallic core. It has a 1,738 km (1,080 miles) equatorial radius.
What is planet ?A celestial body inside the Solar System that meets the following criteria is referred to as a "planet": (a) it must be in orbit around the Sun; (b) it must have enough mass to overcome rigid body forces and take on a hydrostatic equilibrium form that is almost circular; and (c) it must have cleared the area in and around its orbit.
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Directions: Imagine that you are either a Confederate or Union soldier alive during the Civil War. Write a short note to your family describing one of the important events from the Civil War. (Keep in mind the side that you are on.) On the front, draw an illustration of the event and include a short greeting.
HELPPP MEHH PLZZZZ
Answer:
Hey guys...I Miss you very much.I wish i could come home.But i have a mission to complete and i have to complete it. Tell the kids i said hi and i live them very much
Explanation:
GREETING: Hey family i miss you all very much i hope you guys are ready for me to come home.