A dog is 60m away while moving at constant velocity of 10m/s towards you. Where is the dog after 4 seconds?
i really need help please just answer at least one
Answer:
9) a = 25 [m/s^2], t = 4 [s]
10) a = 0.0875 [m/s^2], t = 34.3 [s]
11) t = 32 [s]
Explanation:
To solve this problem we must use kinematics equations. In this way we have:
9)
a)
[tex]v_{f}^{2} = v_{i}^{2}-(2*a*x)\\[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 100 [m/s]
a = acceleration [m/s^2]
x = distance = 200 [m]
Note: the final speed is zero, as the car stops completely when it stops. The negative sign of the equation means that the car loses speed or slows down as it stops.
0 = (100)^2 - (2*a*200)
a = 25 [m/s^2]
b)
Now using the following equation:
[tex]v_{f} =v_{i} - (a*t)[/tex]
0 = 100 - (25*t)
t = 4 [s]
10)
a)
To solve this problem we must use kinematics equations. In this way we have:
[tex]v_{f} ^{2} = v_{i} ^{2} + 2*a*(x-x_{o})[/tex]
Note: The positive sign of the equation means that the car increases his speed.
5^2 = 2^2 + 2*a*(125 - 5)
25 - 4 = 2*a* (120)
a = 0.0875 [m/s^2]
b)
Now using the following equation:
[tex]v_{f}= v_{i}+a*t\\[/tex]
5 = 2 + 0.0875*t
3 = 0.0875*t
t = 34.3 [s]
11)
To solve this problem we must use kinematics equations. In this way we have:
[tex]v_{f} ^{2} = v_{i} ^{2} + 2*a*(x-x_{o})[/tex]
10^2 = 2^2 + 2*a*(200 - 10)
100 - 4 = 2*a* (190)
a = 0.25 [m/s^2]
Now using the following equation:
[tex]v_{f}= v_{i}+a*t\\[/tex]
10 = 2 + 0.25*t
8 = 0.25*t
t = 32 [s]
A 7kg of ball experiences a net force of 5N, what will be its acceleration.
When you sit in a chair, your body exerts a downward force on the chair. What
is the reaction force?
A. The floor pushes up on the chair.
B. The chair pushes down on the floor.
C. Earth's gravity pulls up on the chain
D. The chair pushes up on your body.
Answer:
ITS D !!!
Explanation:
IN ME WE TRUST
When you sit on the chair, your body will exert a downward force and in reaction, the chair pushes up on your body. Hence, option D is correct.
What is a Reaction Force?A building experiences a reaction force when it rests against another object. Calculating the reaction forces at the supports as a result of the forces operating on the beam is a necessary step in the analysis of a beam structure. The reaction forces can be calculated using a free body diagram of the entire beam.
Corrosion can be caused by reaction forces. For instance, due to the system's increased stiffness, reaction forces increase when bearing clearances are reduced from 350 mm to 150 mm.
According to the question, when the body will exert a downward force that is mg due to gravity, the chair will make a normal reaction force which will be equal to the force applied by the body on the chair.
To get more information about Reaction Force :
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witch is the property of matter in witch a substance can transfer heat or electricity
Answer:
B. Conductivity.
Explanation:
Conductivity is the quantity of heat passing per second through a slab of unit cross-sectional area when the temperature gradient between the two faces is unity when put in heat.
Branden ran at 6 m/s for a time of 300s. How much distance did he cover during his run?
Answer:
The covered distance was 1800 [m]
Explanation:
In order to solve this problem we must use the following formula of kinematics. It is important to make it clear that Branden's speed never changes during that time, or therefore the speed is constant.
[tex]x = x_{o}+v*t\\[/tex]
where:
x = distance [m]
Xo = initial position = 0
v = velocity = 6 [m/s]
t = 300 [s]
Now replacing we have:
x = 0 + (6*300)
x = 1800 [m]
HELP GIVING BRAINLIEST
Answer:
16: x4
17 x2
18; 4.5 for q1 and 4.5 for q2
Explanation:
What do zooplankton and krill have in common?
Krill and plankton are two groups of organisms found in the ocean. Krill are species of crustacean related to shrimp, and serve as a very important link in the food chain of the sea. Plankton consist of a larger group of organisms with much more variety, including bacteria, algae, protozoans, jellyfish and some species of cephalopods.
Propulsion
The primary factor that determines whether a species is plankton or not is propulsion. Plankton organisms lack the ability to swim against the tide, and instead float from place to place on sea currents. They may be capable of some movement, and some types of plankton can even hunt for food, but none is powerful enough to make its own headway through the ocean. Adult krill are capable of swimming against currents, but their larvae and eggs fall into the plankton category.
Variation
Krill are crustaceans of the Euphausiacea order, which consists of 86 different species. Plankton, on the other hand, can come from a wide variety of different species and orders. Plankton fall into three broad categories, depending on their primary function. Phytoplankton are plant-like organisms, capable of photosynthesis. Zooplankton are animal plankton species that get their nutrients by eating other microscopic organisms. Bacterioplankton are the smallest plankton, and often serve as food for zooplankton and other lifeforms.
Appearance
Krill species have similar characteristics and generally resemble tiny shrimp. Most species reach around 2 centimeters (0.8 inches) as adults, while the largest species can reach sizes of up to 15 centimeters (5.9 inches). Plankton, on the other hand, consists of organisms of many different shapes and sizes. The smallest categories include microscopic viruses, protozoans, small crustaceans, and other tiny organisms. At the larger end of the scale, megaplankton are any plankton over 2 centimeters (0.8 inches) in size, and include large animals, such as cephalopods and jellyfish. The largest plankton is the lion's mane jellyfish, which can reach 2.5 meters (8.2 feet) in diameter and grow tentacles more than 36.5 meters (120 feet) long.
Role
Plankton and krill serve similar, but slightly different, roles in the food chain. Phytoplankton synthesize nutrients, while bacterioplankton recycle nutrients from decomposing matter in the ocean, providing some of the fundamental sources of nutrition for all ocean creatures. Zooplankton serve to concentrate those nutrients by eating smaller plankton and serving as food for larger creatures. Krill are one step up in the food chain, eating plankton and serving as a nutrient bridge from microscopic life forms to larger fish and mammals.
What is weight? and what is mass
how can magnetic potential energy be transferred to kinetic energy
Answer:
A magnetic force can convert kinetic energy stored in a magnetic field to potential energy. Kinetic energy can convert potential energy stored in a gravitational field. A magnetic energy can convert potential energy stored in a gravitational field to kinetic energy.
what is measurement ?
Answer:
Measurement is the assignment of a number to a characteristic of an object or event
Explanation:
Answer:
Measurement is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or event
The length of the life cycle of a star depends on _.
distance from Earth
the nebula’s brightness
mass and the amount of matter
helium and the amount of matter
Answer:
c.mass and the amount of matter
Bob is pushing a heavy couch to another part of the living room. Bob is pushing with a force of 10 N to the right while the couch is pushing against Bob with a force of 8 N. What is the total net force due to Bob's pushing?
A. 18N to the right
B. 2N to the right
C. 18N to the left
D. 2N to the left
7. Your teacher has mixed salt, pepper, and water. Describe a procedure that you could use to separate this mixture. Be sure to list all of the materials you would need, your set up, and your expected results.
Answer:
hope this could help you
write about any five form of energy with example
Answer:
The different types of energy include thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.
Answer:
Chemical energy
Explanation:
Ex. gasoline, chemical batteries, and wood
draw a diagram of a seismometer showing how the movement of earth is lated into a siesmogram
idk but it seems hard.
What is the most effective way to breathe during strength training?
A neutral atom of alluminum has 13 protons and how many electrons
Answer: also 13
Explanation: because there have to be an equal number of protons,neutrons,and electrons to make the atom stable.
4. Why do chemists use relative masses of atoms compared to a reference isotope rather than the
actual masses of the atoms?
a. The actual mass of an electron is very large compared to the actual mass of a proton.
b. The actual masses of atoms are very small and difficult to work with.
c. The number of subatomic particles in atoms of different elements varies.
d. The actual masses of protons, electrons, and neutrons are not known.
Answer:
B
Explanation:
Answer:
answer is B
Explanation:
took the test
What will be acceleration due to gravity of a feather and coin if
they are dropped in vacuum?
Explanation:
Hey there!
We know that the objects in vacuum falls equally on the surface or bottom. As there is no air resistance in vacuum, the objects has equal stabdard acceleration. (i.e g = 9.8m/s^2)
So, the acceleration due to gravity is 9.8m/s^2.
Hope it helps....
Eclipses occur because the Moon?
A
does not create its own light and only reflects light from the Sun.
o
does not create its own light and only reflects the light from Earth.
o
с
creates its own light, which is blocked by the Sun during an eclipse.
creates its own light, which is blocked by Earth during an eclipse.
Answer:
с
creates its own light, which is blocked by the Sun during an eclipse.
Explanation:
might not be right but its what i remember
How do muscles help the body move?
A. The muscle contracts causing the tendon to pull the bone.
B. The muscle pushes against a joint.
C. One muscle pulls on another muscle.
D. The ligament pulls on the muscle attached to the bone
Answer:
Hello
A. The muscle contracts causing the tendon to pull the bone.
Answer: A
Explanation: The muscle contracts causing the tendon to pull the bone.
star a is composed of 60% hydrogen and star b has 54% hydrogen. which star is older and why
Answer: hello I think I'm in your class..
Explanation:
Mr. juhl is my teacher and he pit this on a test.
I'm Lennox
If the distance from the Earth’s center to the Moon’s center were suddenly doubled, what would occur to the gravitational force between them?
(A) Gravitational force would decrease by a factor of 4.
(B) Gravitational force would increase by a factor of 4.
(C) Gravitational force would decrease by a factor of 2.
(D) Gravitational force would increase by a factor of 2.
Answer:
C)Gravitational force would decrease by a factor of 2.
Explanation:
Hope this helps :)
An elevator ascends at a constant speed of 4 m/s. How much time is required for the elevator in order to travel 200m upwards?
Answer:
Explanation:
Hope this helps, cheers
Do) 13. Which image BEST represents our galaxy?
The best image of galaxy is second option.
What is galaxy?Galaxies are vast systems of gravity-bound gas, dust, dark matter, and anything from a million to a trillion stars. Supermassive black holes are expected to be present at the centers of almost all big galaxies. The sun is merely one of 100 to 400 billion rotating stars in our own galaxy, the Milky Way.
There are more galaxies visible as we gaze farther into space. According to a 2016 study, there are two trillion, or two million million, galaxies in the observable universe. While some of those far-off systems resemble our own Milky Way galaxy, others are very dissimilar,
There are three general types of galaxies elliptical, spiral, and irregular.
So the best shape is second option elliptical with boundary.
To learn more about galaxy refer to the link:
brainly.com/question/24836631
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Anna is conducting an experiment to determine how weather affects cell phone reception. She is trying to decide the best way to conduct her experiment in order to collect meaningful data.
Which of the following experiments would help Anna collect the best data?
A.
Test different cell phones in different locations on days with rainy weather.
B.
Test different cell phones in different locations on days with clear weather.
C.
Test a cell phone's reception in the exact same location under various atmospheric conditions.
D.
Test a cell phone's reception in one location with clear weather and in another location with rainy weather.
When a closed can is heated, the pressure inside it increases. This happens because
Answer:
the heat is growing the particles bigger
Explanation:
Podbijest has a net force of 49 Nading on it and it is accelerating at a rate of 8 mil. What is its med
5 kg
8 kg
40 kg
48 kg
Answer:
6.125kg
Explanation:
Given parameters:
Force = 49N
acceleration = 8m/s²
Unknown:
Mass of the object = ?
Solution:
From newton's second law;
Force = mass x acceleratioin
49 = mass x 8
mass = [tex]\frac{49}{8}[/tex] = 6.125kg
A textbook that weighs 2 Newtons is lifted 4 meters. How much work is done on the book?
Answer:
The answer is 8 JExplanation:
The work done by an object can be found by using the formula
workdone = weight × distanceFrom the question
weight = 2 N
distance = 4 m
We have
workdone = 2 × 4
We have the final answer as
8 JHope this helps you