Answer:
0.33
Explanation:
R= 60N
coefficient of limiting friction = F/R
= 20/60 = 0.33
According to the law of universal gravitation, any two objects are attracted to each other. The strength of the gravitational force depends on the masses of the objects and their distance from each other.
Many stars have planets around them. If there were no gravity attracting a planet to its star, the planet's motion would carry it away from the star. However, when this motion is balanced by the gravitational attraction to the star, the planet orbits the star.
Two solar systems each have a planet the same distance from the star. The planets have the same mass, but Planet A orbits a more massive star than Planet B.
Which of the following statements is true about the planets?
A.
Planet B is more attracted to its star than Planet A.
B.
Planet B will keep orbiting its star longer than Planet A.
C.
Planet A orbits its star faster than Planet B.
D.
Planet A has a longer year than Planet B.
Answer:
C. Plant A orbits its star faster than Plant B
Explanation:
Did it on study island
*Urgent*
(Part 1)
A merry-go-round rotates at the rate of 0.4 rev/s with an 99 kg man standing at a point 2.5 m from the axis of rotation. What is the new angular speed when the man walks to a point 1 m from the center? Consider the merry-go-round is a solid 73 kg cylinder of radius of 2.5 m. Answer in units of rad/s.
(Part 2)
What is the change in kinetic energy due to this movement? Answer in units of J.
Answer:
6.5 rad/s
11.695 kJ
Explanation:
Using the principle of conservation of momentum, we have
L1 = L2 and
I1w1 = I2w2, with I being the moment of inertia and w being the angular velocity.
w1 = 0.4 rev/s = 0.4 * 2π = 2.51 rad/s
Moment of Inertia, I = ½MR² + mr²
I1 = ½ * 73 * 2.5² +99 * 2.5²
I1 = 73 * 3.125 + 99 * 6.25
I1 = 228.125 + 618.75
I1 = 846.875 kgm²
The man has been said to have walked 1 m away from his position, so then
I2 = ½ * 73 * 2.5² + 99 * 1²
I2 = 228.125 + 99
I2 = 327.125 kgm²
From the formula stated above,
w2 = I1w1 / I2
w2 = (846.875 * 2.51) / 327.125
w2 = 2125.65725 / 327.125 rad/s
w2 = 6.5 rad/s
2
K = Iw²
K = 846.875 * 2.51²
K = 2125.65725 J
K'= Iw²
K' = 327.125 * 6.5²
K' = 13821.03125 J
Change in energy is given as, K' - K, so that
Energy, E = 13821.03125 - 2125.65725
Energy, E = 11.695 kJ
Why is it safer to collide with a soft cushion than a hard surface?
Answer:
Impulse is force multiplied by time; and together, the product must be 1 unit. A collision with soft ground will result in the 1 unit of impulse by a larger time and a smaller force (compared to the small time and a large force for the hard floor).
which natural disaster comes from powerful thunderstorms that originate over land
a hurricane
b cyclone
c tornado
d typhoon
Answer:
Typhoons form over landmasses, typically after a period of very warm weather. Desert areas are known to have flash floods. Flash floods are normally widespread over large areas, rising and dissipating slowly. Violent, whirling wind that moves in a narrow path over land, forming a highly destructive funnel is called a .
Explanation:
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If an object has a velocity of 15 m/s and a momentum of 30 kg m/s, what is its mass?
Answer:
30kgm/s/15m/s=2kg
Explanation:mass=momentum/velocity
The mass of the object is 2 kg.
What is momentum?The product of a particle's mass and velocity is its momentum. Momentum is a vector quantity, meaning it has both magnitude and direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of change of momentum.
Given that:
Velocity of the object: v = 15 m/s.
Momentum of the object: p = 30 kg m/s.
Let the mass of the object = m.
From the definition of momentum; we get:
momentum = mass × velocity
30 = 15 m
m = 2 kg.
Hence, mass of it is 2 kg.
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If one soccer ball is rolling to the right at 3 m/s and another soccer ball is rolling left with a speed of 5 m/s, how much momentum is there in this system before they collide with each other? Both have a mass of 1 KG
Answer:
Final momentum after a head on collision is -2kgm/
Explanation:
One ball moves to the right and the other moves opposite and momentum is a vector quantity so that considering the direction
Initial momenta are P₁=2x3=6kgm/s P₂=4x(-2)=-8kgm/s
Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s
Why must 0s always be clearly marked on a motion map?
Answer:
A motion map can represent the position, velocity, and acceleration of an object at various clock readings. ... The corresponding motion map has the points spaced farther apart (because the car would go a further distance in each second), and the velocity vectors (arrows) are longer, because the car is moving faster.
Explanation:
What term is defined as speed with a specific direction?
velocity
position
distance
displacement
Answer:
Velocity
Explanation:
I took the test.
Which type of energy can be sensed by the eyes?
OA. electrical energy
B.
sound energy
OC. thermal energy
D. light energy
Answer:
light energy..
........
Answer:
light energy
Explanation: that is the only type of energy you can actually see.
Agatha has 1kg samples of two substance- A and B. Substance A has a higher specific heat capacity than substance B. Both samples cool down by 10C. Which will release more heat - A or B
Answer:
Substance A will release more heat.
Explanation:
Let suppose that both substances experiment an entirely sensible heat process and are incompressible and begin at the same temperature. Physically speaking, specific heat ([tex]c[/tex]), measured in kilojoules per kilogram-degree Celsius, can be described by following expression:
[tex]c = \frac{Q}{m\cdot (T_{f}-T_{o})}[/tex] (1)
Where:
[tex]Q[/tex] - Released heat, measured in kilojoules.
[tex]m[/tex] - Sample mass, measured in kilograms.
[tex]T_{o}[/tex], [tex]T_{f}[/tex] - Initial and final temperatures of the sample, measured in degrees Celsius.
If we know that [tex]c_{A}> c_{B}[/tex], [tex]m_{A} = m_{B}[/tex], [tex]T_{A,o} = T_{B,o}[/tex] and [tex]T_{A,f} = T_{B,f}[/tex], then we have the following inequation:
[tex]\frac{Q_{A}}{m\cdot (T_{A,f}-T_{A,o})} > \frac{Q_{B}}{m\cdot (T_{B,f}-T_{B,o})}[/tex]
[tex]Q_{A} > Q_{B}[/tex]
Substance A will release more heat.
A 127 N object vibrates with a period of 3.32 s when hanging from a spring. What is the spring constant of the spring? The acceleration of gravity is 9.81 m/s 2 . Answer in units of N/m.
Answer:
The spring constant is approximately 46.382 newtons per meter.
Explanation:
From Physics, the period ([tex]T[/tex]), measured in seconds, experimented by an object under Simple Harmonic Motion:
[tex]T = 2\pi\cdot \sqrt{\frac{W}{g\cdot k} }[/tex] (1)
Where:
[tex]W[/tex] - Weight, measured in newtons.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]k[/tex] - Spring constant, measured in newtons per meter.
If we know that [tex]W = 127\,N[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]T = 3.32\,s[/tex], then the spring constant of the system is:
[tex]\frac{T^{2}}{4\cdot \pi^{2}} = \frac{W}{g\cdot k}[/tex]
[tex]k = \frac{4\cdot \pi^{2}\cdot W}{g\cdot T^{2}}[/tex]
[tex]k \approx 46.382\,\frac{N}{m}[/tex]
The spring constant is approximately 46.382 newtons per meter.
Explain why background radiation is a mixture of contamination and irradiation
Answer:
People are exposed to sources of radiation in all aspects of everyday life. Radioactive sources can be very useful but need handling carefully to ensure safety.
Explanation:
The difference between a Scalar quantity and a Vector quantity?
Answer:
A quantity that has magnitude but no particular direction is described as scalar. A quantity that has magnitude and acts in a particular direction is described as vector.
an object that is accelerating may be
It must be either speeding up, or slowing down, or turning. There are no other possibilities.
Between steel and iron which is more suitable for making permanent magnets electromagnet and magnetic screen give reason for your answer
Answer:
steel is suitable for making permanent magnet
as still has hi factor coercity.
iron is for electromagnet and magnetic screen as iron loses its magnetism as soon as the switch is open and a current is switched off.
Steel is better suitable for making permanent magnets than soft iron since it has higher retentivity and lower coercivity. Compared to soft iron, steel has a lower retentivity and higher coercivity. Compared to soft iron, steel is more resilient and coercive.
What is retentivity and coercivity ?Retentivity : The ability to retain the generated magnetization in a magnetic material when the magnetizing force is removedCoercivity : A measure of the ability of a material to withstand an external magnetic field without becoming demagnetized.What is Permanent magnet and Electromagnet?Permanent magnet : To be suitable for permanent magnet, material should retain its magnetism for longer time, since steel have high retentivity and coercivity . Electromagnet : To be suitable for electromagnet , material should have magnetization and demagnetizing property .
Since , steels have high remanence which means it will remain magnetized even after magnetic field is removed which is not suitable for electromagnetic . iron has high permeability so magnetization is larger and have low retentivity so that material will not retain the magnetic properties . Magnetic screen , Iron has high permeability hence it can shield better than steel
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Put the following objects in order of increasing momentum: a parked car, a train moving at 50 km/h, a train moving at 80 km/h, a car moving at 50 km/h.
Answer:
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80km\h
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80 km\h is increasing momentum order.
What is momentum?
In Newtonian mechanics, momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If m is an object's mass and v is its velocity, P = mv.
The total momentum experienced by the object depends on the force acting on it. The momentum remains unchanged in the absence of external forces.
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80 km\h is increasing momentum order.
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A spring with a spring constant of 40 N/m is compressed 0.15 m. How much energy is stored in the spring?
Answer: Energy is conserved.
Explanation: Energy stored in spring = Potential energy gained by object at maximum height
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
I can help with the last question.
Explanation:
The force from the ball on the left ball will hit the ball next to it, bringing the force all the way to the right ball, and vice versa. Have a great day!
Answer:
gravity is pulls objects to the center of the earth.
friction is slows or stops motion when objects rub together.
magnetism is pushes or pulls objects containing iron or other metals.
which of these is NOT a metamorphic rock?
Basalt
Slate
Marble
Explanation:
Basalt is not a metamorphic rocks
How much voltage would it take to push 0.5 amps through a 2 kilowatt toaster?
1000 Volts
2000 Volts
3000 Volts
4000 Volts
5000 Volts
6000 Volts
Given :
Current, I = 0.5 A.
Power of toaster, P = 2 kW = 2000 W.
To Find :
How much voltage is required.
Solution :
We know, voltage is given by :
[tex]V = \dfrac{P}{I}\\\\V = \dfrac{2000\ W}{0.5 A}\\\\V = 4000 \ volts[/tex]
Therefore, 4000 Volts are required.
Answer:
4000
Explanation:
2000/0.5=4000
Hypochondriacs seek out medical care in order to verify that they do not have an illness.
Please select the best answer from the choices provided
T
F
Answer:
False
Explanation:
Just took the test
False, because hypochondriacs think they have a significant, undetected medical ailment even when testing reveal they are healthy.
Who are hypochondriacs?A hypochondriac is someone who, despite diagnostic testing showing they have no health issues, lives in constant anxiety that they have a terrible, undetected medical illness. They are obsessed with the concept that they suffer from a major illness that has gone untreated.
In adults, hypochondriasis often begins to manifest. Among the symptoms are a persistent, strong anxiety of developing a major illness and concern that seemingly little symptoms portend a larger problem. A patient may change physicians or see them regularly.
Medication and counselling could be helpful.
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What happens when an object becomes cold?
Energy is added to it.
Mass is removed from it.
Cold is added to it.
Heat is removed from it.
Answer:
Heat is removed from it.
Explanation:
A object will become cold when it loses its heat to its surroundings. I would look up the 3 Principles of Heat Transfer.
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why is there no reflection formed when light is absent?
Explanation:
Because there is no light to be reflected. Reflection is the process of bouncing back of the light but since there is no light then nothing will be reflected.
It is correct .
The light is not reflected by the mirror in a dark room due to which no image is formed.
What are shadows?A shadow is a dark area where light from a light source is blocked by an opaque object.It occupies all of the three - dimensional volume behind an object with light in front of it. The cross section of a shadow is a two - dimensional silhouette, or a reverse projection of the object blocking the lightGiven is that no reflection is formed when light is absent.
We will not see our reflection in mirror in a dark room because an image is formed only when the light gets reflected by the mirror whereas in a dark room, there is no light to cause reflection hence, no image will be formed
Therefore, the light is not reflected by the mirror in a dark room due to which no image is formed.
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If a machine exerts a force of 250N on an object and no work is done, what must have occurred?
pennies used to be called coppers. how do you suppose they got this nickname?
Answer:
because pennies are made from copper
Explanation:
Are stairs a type of inclined plane?
Answer:
Inclined planes are simple machines used to make work easier. Ramps, ladders, and staircases are all inclined planes.
Explanation:
Answer:
imma say yes
Explanation:
which event involves throwing a spherical weight from the shoulder?
a. discus throw
b. hammer throw
c. shot put
Answer:
c. shot put
Explanation:
cause the shot is a ball
How to calculate the refraction of light from air to water
Answer:
hope it would be helpful
Eiman connects eight 12Ω lamps in series. What is
the total resistance of the circuit?
Answer:
Total resistance = 96 Ohms
Explanation:
Given the following data;
Resistance = 12 Ohms
Number of resistors = 8
To find the total resistance;
Method I.
Since the resistors are connected in series, we would simply multiply the resistance by the number of resistors.
Total resistance = 12 * 8
Total resistance = 96 Ohms.
Method II.
We would add the resistance of all the eight resistors together.
Total resistance = 12 + 12 + 12 + 12 + 12 + 12 + 12 + 12
Total resistance = 96 Ohms.
The total resistance of the circuit will be "96 Ω".
Resistance and Current:Resistance: The amount of resistance to current flow throughout an electrical circuit.
Current: The movement of electrical charge carriers such as electrons has been referred to as current. The flow of current seems to be from negative (-) to positively (+) locations.
According to the question,
Resistance = 12 Ω
No. of resistor = 8
The total resistance be:
= [tex]Resistance\times Number \ of \ resistors[/tex]
By substituting the values,
= [tex]12\times 8[/tex]
= [tex]96 \ \Omega[/tex]
Thus the above answer is right.
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please help me guys please please please
Answer:
Mass = 2154 grams
Explanation:
Given the following data;
Acceleration = 520m/s²
Force = 11.2N
To find the mass;
Force = mass * acceleration
Mass = force/acceleration
Substituting into the equation, we have;
Mass = 11.2/520
Mass = 2.154 kg
Therefore, the value of mass in grams;
1000 grams = 1 kilograms
x grams = 2.154 kilograms
Cross-multiplying, we have;
2.154 * 1000 = 2154 grams.
Mass = 2154 grams.
Therefore, the mass of the model rocket is equal to 2154 grams.
