Answer:
Key Points
When an object is spinning in a closed system and no external torques are applied to it, it will have no change in angular momentum.
The conservation of angular momentum explains the angular acceleration of an ice skater as she brings her arms and legs close to the vertical axis of rotation.
If the net torque is zero, then angular momentum is constant or conserved.
Key Terms
quantum mechanics: The branch of physics that studies matter and energy at the level of atoms and other elementary particles; it substitutes probabilistic mechanisms for classical Newtonian ones.
torque: A rotational or twisting effect of a force; (SI unit newton-meter or Nm; imperial unit foot-pound or ft-lb)
angular momentum: A vector quantity describing an object in circular motion; its magnitude is equal to the momentum of the particle, and the direction is perpendicular to the plane of its circular motion.Key Points
When an object is spinning in a closed system and no external torques are applied to it, it will have no change in angular momentum.
The conservation of angular momentum explains the angular acceleration of an ice skater as she brings her arms and legs close to the vertical axis of rotation.
If the net torque is zero, then angular momentum is constant or conserved.
Key Terms
quantum mechanics: The branch of physics that studies matter and energy at the level of atoms and other elementary particles; it substitutes probabilistic mechanisms for classical Newtonian ones.
torque: A rotational or twisting effect of a force; (SI unit newton-meter or Nm; imperial unit foot-pound or ft-lb)
angular momentum: A vector quantity describing an object in circular motion; its magnitude is equal to the momentum of the particle, and the direction is perpendicular to the plane of its circular motion.
Explanation:
Who will create a greater pressure, a heavy person standing on a bed or a lighter person lying on the bed? Explain your answer.
Answer:
a heavy person standing on a bed
Explanation:
The heavy person will have more mass than the lighter person, so they will create greater pressure.
If the mass of a car is 1,100 kg and its momentum is 22,000 kg
m/s, then what is its velocity?
The velocity of the car will be [tex]V=18.18\ \frac{m}{s}[/tex]
What will be the velocity of the car?As velocity is the movement of the car with respect to time.
It is given that
Mass m = 1100kg
Momentum= 22000 [tex]\frac{kgm}{s}[/tex]
The momentum is given as
[tex]P=mv[/tex]
[tex]v=\dfrac{p}{m}[/tex]
[tex]v=\dfrac{22000}{1100} =18.18 \ \dfrac{m}{s}[/tex]
Thus the velocity of the car will be [tex]V=18.18\ \frac{m}{s}[/tex]
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2. A digital camera records each image as 8 megapixels, with each pixel transferring 14 bits of information. What is the minimum capacity for a memory card which could hold 120 images?
Given what we know, we can confirm that due to its relatively low image quality, any memory card with at least one MB will be sufficient to hold the 120 images taken.
Why is one MB enough?The photos are taken at 8 megapixels, with each one occupying 14 bits of information. A megabit consists of one million bits of potential storage. Therefore, the 120 pictures will occupy roughly 1% of the available storage of a 1 MB memory card.
Therefore, we can confirm that due to its relatively low image quality, any memory card with at least one MB will be sufficient to hold the 120 images taken.
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A 4-kg box is pushed against a flat 1 point
surface with a force of 100 N for 5
meters. The work done on the box is
Answer:
wd = F * D
wd = 100 * 5
wd = 500
The work done on the box is 500 Joules.
What is work?
When an object is moved over a distance by an external force, at least a portion of which is applied in the direction of the displacement, it is said to have done "work" in physics. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant.
As work is a scalar quantity, it can be defined only by magnitude, it has no direction. SI unit of work is Joule and CGS unit of work is erg.
Given parameters:
Mass of the box: m = 4 kg.
Force applied on the box: F = 100 N.
Displacement of the box: d = 5 meters.
Hence, the work done on the box is = applied force × displacement
= 100 N × 5 meters
= 500 Joules.
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A typical wall outlet in the United States provides a voltage of 120 V to your appliances. What current would be necessary for the electricity to pass through a 8-ohm resistor ? Amps
Answer:15 Amps
Explanation:
CK12 said it was right
greenhouse gases effect is caused primarily by which processes?
a- absorbing outgoing long wave radiation from the earth
b- absorbing incoming short wave solar energy.
c- heating of the earth stratosphere
d- blocking incoming short wave solar energy
explain 4 factors affecting centripetal acceleration
Answer:
it's speed
mass of the object
and the radius of the circle
ACTIVITY 1: IDENTIFY IT RIGHT AWAY! Directions: Identify what is being described in each item.
1. The first name of the sport badminton.
2. A high-drag projectile, with an open conical shape.
3. Racquet sport played using racquets to hit a shuttlecock across a net.
4.The year when the first rules for badminton were established.
5. A rectangular in shape and divided into halves by a net.
The Identification of what is being described in the text above is written below:
The first name of the sport badminton was Poona. A high-drag projectile, with an open conical shape is called shuttlecock.Racquet sport played using racquets to hit a shuttlecock across a net is called badminton.The year when the first rules for badminton was established is 1877.A rectangular in shape and divided into halves by a net. is called the court.What was Poona about?This was known to be the first and original name that was given to badminton. This word was said to have originated from a city that has the same name in India where badminton was said to be a popular sport that was played by the British military officers.
Conclusively, badminton is a very popular sport today and the name and rules used in Poona were first made public in 1873.
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Calculate the momentum of a 0.145 kg baseball being thrown at a speed of 40.0 m/s.
Answer:
5.8 kg*m/s
Explanation:
p = mv
momentum = mass times velocity
momentum = 0.145 kg times 40.0 m/s
momentum = 0.145* 40.0
momentum = 5.8 kg*m/s
4. What's metamorphism?
A. The process by which new minerals form as a result of precipitation from an aqueous solution
B. The process by which do minerals form as a result of biological processes in living organisms
C. The process by which two minerals form from existing minerals that become unstable at earth’s surface
D. The process by which new minerals form from existing minerals as a result of elevated temperature or pressure
Answer: Your answer is D. The process by which new minerals form from existing minerals as a result of elevated temperature or pressure
Hope this helps!
Which of the following would you expect to
be a strong electrolyte in solution?
(a) H2O
(b) HCI
(c) sugar
(d) alcohol
Answer:
HCI
Explanation:
HCI is a strong electrolyte and an acid.
HElp meee
explain how to do this also
Answer:
[tex]\huge\boxed{\sf x = 18\°}[/tex]
Explanation:
If ∠ABC and ∠DEF are complementary angles, this means they add up to 90 degrees.
So,
∠ABC + ∠DEF = 90°
72 + x = 90
Subtract 72 to both sides
x = 90 - 72
x = 18°
[tex]\rule[225]{225}{2}[/tex]
______ resources will eventually run out, while ________ resources can be generated anew.
A. Limited, abundant
B. Finite, regenerative
C. Nonrenewable, renewable
D. Usable, sustainable
Answer:
C. Nonrenewable, renewable
Hope this helps!
A _________________ is one that forms where rays converge
Answer:
real image
I hope this helps you
:)
) The boy then walks to a village. The displacement from his starting point is (400, -50) m. How much gravitational potential energy did he lose going from the top of the hill to the village?
The boy would lose 25000 Joules going from the top of the hill to the village.
What is potential energy?Potential energy is the energy stored in an object as a result of its position in relative with another object. It is given by:
Potential energy = mass * acceleration due to gravity (g) * height.
g = 10 m/s²
Let us assume the boy has a weight of 50 kg. His starting point is (400, -50) m. This means the hill is 50 m high and 400 m from the village.
Potential energy = 50 * 10 * 50 = 25000 Joules
The boy would lose 25000 Joules going from the top of the hill to the village.
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In a footrace between two runners, is it possible for the second-place finisher have a greater speed
at the finish line than the winner?
Answer:
no
Explanation:
this may be wrong, but i would assume no because they have to cover the same distance therefore the faster runner would cross the finish line first.
Competition in the Los Angeles Flower District results in
higher floral prices
better quality flowers
poor customer service
Competition in the Los Angeles Flower District results in better quality flowers.
Why quality is the standard in flower competition?Competition results in better quality flowers because in the competition, best quality of flowers will be selected as a winner so the competitors produces best quality of flowers in order to claim the prize so we can conclude that Competition in the Los Angeles Flower District results in better quality flowers
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____________ of matter = particles (tiny building blocks that make up matter) cannot be created or destroyed Question 2 options: Limited Conservation Closed Explosion
Answer:
Limited Conservation
Explanation:
Atoms
matter is never created or destroyed, it cycles through our world. Atoms that were in a dinosaur millions of years ago—and in a star billions of years before that—may be inside you today. The tiny particles called atoms are the basic building blocks of all matter
nationalgeographic
What is the effect of using uranium on the environment? Please don’t search it up at any other website.
Answer:
Positives:
- The Electricity is Carbon-free
- The Power Stations have a 'Small Land Footprint' and a very High Power Output
Negatives:
- Can produce decay products which are harmful such as Nuclear Waste
- Non-renewable Source of Energy
Answer:
Uranium is radioactive
Explanation:
By using and enriching uranium you will expose the environment to EM radiation which is harmful to organisms, either through the uranium directly or through its waste products.
HELP!!! Think about the soccer ball rolling down the inclined plane from the previous lesson if a student used a 6 kg bowling ball instead of a 05 kg soccer ball the acceleration would_____ and the kinetic energy would____
what is the formular for kinetic friction
Answer:
Kinetic friction is related to the normal force N by f k = μ k N f k = μ k N ; thus, we can find the coefficient of kinetic friction if we can find the normal force on the skier
Explanation:
A spring has a natural length of 28.0 cm. If a 23.0-N force is required to keep it stretched to a length of 36.0 cm, how much work W is required to stretch it from 28.0 cm to 32.0 cm
Answer:
0.23 J
Explanation:
k*(36 - 28) = 23
so k = 23/8 N/cm
W = k(32 - 28)²/2 = 23/8 * 4²/2 = 23 N-cm = 0.23 J
please help oooooooo
Answer: Can't see clearly.
Explanation:
An unbalanced force of 2 newtons applied to a given mass produces an acceleration. of an unbalanced force of 1 newton is applied to the same mass, the acceleration produced will be
the same
twice as much
one-half as much
four times as much
Explain your answer to the previous question, using full sentences.
i desperately need help!!!
Answer:
Twice as much
Explanation:
D 5-7 Be the only person I know of is the Book with all men and men and people experience the first of the wisdom and
The acceleration produced will be one-half as much.
What is acceleration?Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. SI unit of acceleration is meter/second² (m/s²).
From Newton's 2nd law of motion; it can be written that:
Force = mass × acceleration
acceleration = force/mass.
Now, according to the question, an unbalanced force of 2 newtons applied to a given mass produces an acceleration.
So, when an unbalanced force of 1 newton is applied to the same mass, the force applied on the object becomes half.
Hence, from the equation, the acceleration produced will be one-half as much.
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I drove from Oklahoma to California (1452.9 miles) in 23 hours? What was my average speed?
Answer:
63 miles per hour
Explanation:
you just divide miles and hours to get your average speed
I need at least 20 lab safety hazards listed from this picture and I’m so lazy
Answer:
1. messy
2. unorganized
3. dangerous
4. not a safe place
5. chemicals everywhere
6. hazardous
7. no adult in room
8. no guidance
9. children do not know what their doing
10. sharp objects
11.messing around
12. child messing around on high areas
13. can cause dangerous chemical reactions
15.adult may not know the children are in the room
16 the adult may be irresponsible
17.do not have experience
18. unprofessional
19. may get adult in trouble
20. is responsible or may not be.
Which of the following is not a sub-discipline of basic sciences?
a.
Physics
b.
Chemistry
c.
Mathematics
d.
Logic
Answer:
D
Explanation:
Physics and Chemistry are the most basic disciples in science, so the answer is not A or B.
Mathematics is the language of science; it could be the answer.
Most likely, you are looking for logic which describes the validity of an argument that has already been developed. I would pick D, but your marker may not agree.
Determine the mass of a sphere with a radius of 8 cm having a density of 7500 kg / m3
Answer:
Explanation:
V=2140CM3
M=VOLUME*DENSITY
7500kg/m3=7.5g/cm3
2140cm3*7.5g/cm3=16050
16050g
Block 1 is sliding toward identical block 2 on a surface of negligible friction. In situation 1, after the two blocks collide, the block 1 stops and block 2 moves off to the right. It situation 2, the two blocks collide and stick together. Which of the following claims correctly describes the motion of the center of mass of the two-block system and provides reasoning for that claim?
In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
A
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.,
B
In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
Answer C: In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
C
In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
Answer D: In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
D
In situation 2, the center of mass has a zero velocity, because the velocity of the center of mass of the system is always zero.
Answer:
Explanation:
Situation 1 describes an elastic collision in which momentum is conserved while situation 2 is an inelastic collision in which momentum is not conserved.
When momentum is conserved, the speed of center of mass will not change. So the correct answer is Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer:
A
Explanation:
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Hope it helped~
FIGURE 4.1 shows a rectangular wire loop 0.3 m x 0.2 m moving horizontally to the right at 12 ms -1 in a uniform magnetic field of 0.8 T. The induced current in the wire is 3 A.
(i) Determine the resistance of the wire loop
(ii) Determine the direction of the induced current. Explain how you determine the direction of the induced current.
[tex]\underline{\underline{\large\bf{Solution:-}}}\\[/tex]
(I) Emf developed,E in the loop is given as:
[tex]\begin{gathered}\\\implies\quad \sf E = BLv \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \sf E = 0.8 \times 0.3 \times 12 \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \sf E = 2.88 V \\\end{gathered} [/tex]
[tex]\longrightarrow[/tex]I = E/R
[tex]\quad[/tex]R = E/I
where
R = resistanceE = Induced EMFI = Current[tex]\begin{gathered}\\\implies\quad \sf R = \frac{2.88}{3} \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \boxed{\sf{ R = 0.96 \;ohm}}\\\end{gathered} [/tex]
(ii) The direction of current induced is from P to Q which is given by B × V vector . It may also be explained by Lenz law. Since magnetic field is from S to N . The fingers of the right hand are placed around the wire so that the curling of fingers will show the direction of the magnetic field produced by the wire then the thumb points in the direction of current flow which is from P to Q.