Answer:
D: 4.4m/s
Explanation:
From a known theorem the total work on a body is equal of the variation of kinetic energy:
[tex]W = \Delta K = K_f-K_i = \frac12 mv_f^2 - \frac12 m v_i^2[/tex]
Taking the first and last step in the chain of equalities and replacing the values we have, we get:
[tex]5 = \frac12(1)v_f^2 - \frac12(1)(3)^2\\10= v_f^2 -9 \rightarrow v_f^2 = 19 \rightarrow v_f=\sqrt19 \approx 4.4m/s[/tex]
How are particles in liquids, solids, and gases the same? How are they different?
Answer:
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
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A roller is pushed with a force of 100 N along its handle, which is at an angle of 60 degrees with the horizontal. Find the work done in moving it through 20 m?
Answer:
1 kJ
Explanation:
By definition of work, [tex]W = \vec F \cdot \vec x = |\vec F| |\vec x| cos\angle Fx[/tex]. Let's replace the values: [tex]W = 100N\cdot 20m \cdot cos 60 = 1000 J[/tex]
A train travels 9 meters in the first second of travel, 9 meters again during the second second of travel, and 9 meters again during the third second. What is its acceleration?
Answer:
Zero
Explanation:
Acceleration is defined as the rate of change in speed. The speed during the first second is 9m/1s = 9m/s. During the second second is again 9m/1s = 9m/s and again 9m/s for the third second. Being the speed the same, the acceleration is 0
Watch the video and make a ninja star. Once you have made a ninja star, 5 Point Ninja Star. Explain the energy transfer in the ninja star once it has been assembled.
PLEASE HELP
Answer:
kinetic energy because it is movement
Explanation:
which terrestrial planets have diameters that are nearly equal in size?
Answer:
Venus and Earth have the diameter nearly equal in size
. A small toy car having 300 grams of mass and going straight with an initial velocity of 13 m/s. When the toy car collides with an obstacle, a resistive force of 4 N acts upon it. The speed of the toy car reduced and reached 8 m/s. Draw its free body diagram and then find the time for the toy car to be into rest position?
The free-body diagram is attached in the image below. The time for the toy car to be in rest position is 0.6 s
From the given information:
The mass of the toy car = 300 g = 0.3 kgThe initial velocity (u) of the car = 13 m/sThe resistive force F_r acting on the car = 4 NThe speed of the car (v) = 8 m/sA force is regarded as a push that causes an alteration in motion of an object within a specified distance. It is usually expressed by the formula:
Force = mass × acceleration∴
acceleration = Force/massacceleration = (4 / 0.3) m/s²acceleration = 13.33 m/s²Using the first equation of motion for the time to bring the car to rest from it reduced speed of 8 m/s;
v' = v + atsince the final speed to bring the car in rest position is (0), then:
0 = 8 - 13.33(t)
13.33(t) = 8
t = 8/13.33
t = 0.6 seconds
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Determine the force required to move a block if the coefficient of static friction of one block and the floor is 0.35 and the coefficient of the static friction between 2 boxes is 0.25
Answer:
32.5
Explanation:
Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N .
Determine the friction coefficient. ...
Multiply these values by each other: (250 N) * 0.13 = 32.5 N .
You just found the force of friction!
in general, what happens to the density and temperature of a gas as it expands?
The temperature of a gas will increase and the density will decrease as it
expands.
The expansion of gas happens as a result of an increase in the elastic
collision of the atoms. This is as a result of the increase in temperature which causes the atoms to be more spatially arranged.
The density of gas also reduces as a result of the same number of gas
molecules occupying more volume.
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A plane is flying through the sky at a constant speed. The thrust of the aeroplane (making it go forwards) is 100N. Air resistance is also acting on the plane. What must the resultant (overall) force be on the plane?
A: 0N
B: 50N
C: 100N
D: 150N
Answer: 0N
Explanation: Hope this helps :)
last time i wrote the wrong answer for the wrong problem :)
For the constant speed, the resultant force on the plane is 0N. So, the correct option is A.
What is Force?A force is defined as the parameter that can change the momentum of an object that can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or pull where force has both magnitude and direction, making it a vector quantity.
For above given information, the plane is moving at a constant speed. According to Newton's first law, the net external force on the aircraft due to the thrust generated by the propeller must be zero and air resistance is equal and in opposite directions to produce zero net force.
Thus, for the constant speed, the resultant force on the plane is 0N. So, the correct option is A.
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What potential difference is needed to make a current of 5A glow through a material with a resistance of 2 ohms
Answer:
10V
Explanation:
Applying V = IR
V = 5A × 2 ohms
V= 10 V
Potential difference or voltage is needed to make a current of 5A glow through a material with a resistance of 2 ohms is 10 V.
What is voltage?The difference in electric potential between two places is known as voltage, often referred to as electric pressure, electric tension, or potential difference. It relates to the amount of labor required to transfer a test charge between two places in a static electric field.
V = IR
V = 5A × 2 ohms
V= 10 V
Potential difference or voltage is needed to make a current of 5A glow through a material with a resistance of 2 ohms is 10 V.
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Which type of electromagnetic radiation is useful in communications technology?
A. X-rays
B. visible light
C. radio waves
D. ultraviolet radiation
why is the cooling system in a nuclear power station important? what will happen if the system malfunction?
What is Flexibility ?
=> Flexibility is the ability of a joint or series of joints to move through an unrestricted, pain free range of motion.
You place a small sphere with a net charge of 5 space x space 10 to the power of negative 6 end exponent space C at one corner of a square that measures 5 m on each side. What is the magnitude of the electric field at the opposite corner of the square?
900 N/C
9,000 N/C
450 N/C
4,500 N/C
an unbalanced force of 965 N causes an object to accelerate at 54.5 m/s^2. what is the mass of the object
Answer:
[tex]F=ma \\ 965 = m(54.5) \\ m = \frac{965}{54.5} \\ m = 17.7kg[/tex]
7. Sally's mass on Earth is 50 kg. What is her weight on the moon?
The acceleration due to gravity she experiences on the moon is 1.652
a. 490 N
b. 8.3 kg
c. 50 kg
d. 82.6 N
Answer:
82.6
Explanation:
Convert 9/4 hours into minutes
Am guessing;
9/4 × 60/1 =135
which gravitational pull has the greatest effect on tides?
Answer: The pull of the Moon's gravity on Earth is the primarily cause of tides and the pull of the Sun's gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon's pull is about twice that of the Sun's.
1. The two images below show the area swept out by the same planet during two separate time spans. If the first picture represents the area swept out during a time
of 'A' days and the second represents the area swept out during a time of "B* days, which of the following statements is true about A and B? Pls help
Answer:
its A
Explanation:
took the test
In essence, this means that planets do not travel along their orbits at a constant speed. Instead, they move at different speeds so that the line connecting the centres of the Sun and the planet covers the same amount of ground in equal amounts of time. Thus, option A is correct.
What planet during two separate time spans?The law of areas is Kepler's second law of planetary motion. A line drawn between a planet and the Sun is said to cover equal areas in an equivalent amount of time according to this law.
The velocity of a planet as it travels along its elliptical course is described by Kepler's Second Law. An elliptical object will cover equal amounts of space in a same amount of time if a line is drawn from the sun to the planet. This implies that the planet moves more slowly away from the sun and faster toward it.
Therefore, at equal times, the planet must cover a wider arc when it is nearer the Sun than when it is farther away.
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a wave is recalling with a speed of 5m/s for 7 seconds. How far has the wave travelled?
Answer:
35m
Explanation:
Take the speed of 5m/s and multiply that by 7 seconds. You get 35m
Which example shows an endothermic reaction?
reactants + thermal energy --> products
products + thermal energy --> reactants
products --> reactants + thermal energy
reactants --> products + thermal energy
please help
Answer:
reactants --> products + thermal energy
Explanation:
Heat is absorbed in endothermic reaction.
The tiny planet Mercury has a radius of 2400 km and a mass of 3.3 times 10^23 kg.
a) What would be the gravitational acceleration of an astronaut standing on
the surface of Mercury? b) Compare the motion of a ball dropped on the
surface of Mercury to that of a ball dropped on Earth.
Answer:
I think that you need the gravitational acceleration of mercury
so we will use Newton's gravitational law :
gravitational acceleration = G*m/2
G is the gravitational constant = G = 6.673×10^-11 N m^2 kg^-2
after substitution : m^7x r67 / 11
6.673×10^-11 * 3.2x10^23 / (2.43x10^6)^2
using calculator : 2.00007899999
gravitational acceleration of mercury = 3.61625 m/s^2
pls give me brainliest
Explanation:
I need help! Use your observations to support or reject this claim "If the samples are at the same temperature, the amount of thermal energy in a sample depends on the type of material and the amount of the material" Its the Phet Lab
Answer:
i cannot see the the claim
Explanation:
A group of students is investigating whether wheels affect the force of friction. The students push two boxes each with the same force on a table. One box has wheels and the
other does not have wheels. The distance traveled by each box is shown.
Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by box with wheels
24 cm
22 cm
20 cm
23 cm
Distance traveled by box without wheels
12 cm
14 cm
15 cm
13 cm
Which step should the students take next?
Make a hypothesis
Test another variable
Analyze the results
Share their conclusion
C. analyze the results....
What is the correct description for an element?
A. Elements are made of two or more different types of atoms, chemically joined together
B. Elements are made up of one type of atom only
C. Elements are made of two or more types of atoms, not chemically joined
Answer:
B
Explanation:
Elements are made up of one type of atom only
What are the 4 classes of Platyhelmintheses and how are they different.
Answer: Platyhelminthes are divided into four classes: Turbellaria, free-living marine species; Monogenea, ectoparasites of fish; Trematoda, internal parasites of humans and other species; and Cestoda (tapeworms), which are internal parasites of many vertebrates.Mar 5, 2021
Explanation:
6. A squirrel performs 20 J of work climbing a tree in 5 seconds. What
was the squirrel's power?
Mechanical waves form when a source of energy causes a medium to what
Answer:
Ripple in water is a surface wave. A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission —the material—is limited.
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
Answer:
its in this order 2,1,1
Explanation:
trust me bro
Answer:
221 is the actual answer
Explanation:
dont trust the person above me
When might people use data tables and graphs in their everyday lives? How are these uses similar to and different from the way in which scientists use these same tools?
Do you think scientists need data tables and graphs to do their work?
Which fields of science do you think might use data tables and graphs more than others?
Answer:
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