Answer:
[tex]I=2\ kgm^2[/tex]
Explanation:
Given that,
Mass of a person, m = 72 kg
Force acting on a doorknob, F = 5 N
The doorknob is located 0.800 m from axis of the frictionless hinges of the door.
The angular acceleration of the dor, a = 2 rad/s²
We need to find the moment of inertia of the door about the hinges.
The person applies a torque to the door and it is given by :
[tex]\tau=Fr[/tex] ...(1)
Also, the torque is equal to :
[tex]\tau=I\alpha[/tex] ...(2)
From equation (1) and (2) we get :
[tex]Fr=I\alpha[/tex]
I is the moment of inertia
[tex]I=\dfrac{Fr}{\alpha }\\\\I=\dfrac{5\times 0.8}{2}\\\\=2\ kgm^2[/tex]
So, the moment of inertia of the door about the hinges is [tex]2\ kgm^2[/tex].
If John throws a "ball” from a cliff with a speed of 15 m/s, how far from the bottom of the cliff does it land after 10 seconds?
Answer:
wazzam blood
Explanation:
What 2 things define the state of matter?
Answer:
mass and volume
Explanation:
matter is anything that has mass and occupies space(volume)
Answer:
Four states of matter are observable in everyday life: solid, liquid, gas, and sometimes plasma.
Shape is a characteristic property of matter.
The amount of matter in an object doesn't really affect the characteristic properties of the object
Explanation:
If a wind instrument, such as a tuba, has a fundamental frequency of 56.0 Hz, what are its first three overtones (in Hz)? It is closed at one end. (The overtones of a real tuba are more complex than this example, because it is a tapered tube.)
Answer:
168 Hz, 280 Hz and 392 Hz
Explanation:
The resonant frequencies for a closed pipe at one end is given by :
[tex]f=\dfrac{nv}{4L}[/tex], n = 1,3,5...
The fundamental frequency, f₁ = v/4l = 56 Hz
For first overtone, put n = 3
[tex]f_3=\dfrac{3v}{4L}\\\\=3\times \dfrac{v}{4L}\\\\=3\times 56\\\\=168\ Hz[/tex]
For second overtone, put n = 5
[tex]f_5=5\times f_1\\\\=5\times 56\\\\=280\ Hz[/tex]
For third overtone, put n = 7
[tex]f_7=7\times f_1\\\\=7\times 56\\\\=392\ Hz[/tex]
So, the first three overtones are 168 Hz, 280 Hz and 392 Hz.
A jet plane flying 600 m/s experiences an acceleration of 4.0 g when pulling out of the circular section of a dive. What is the radius of curvature of this section of the dive?
Answer:
The radius is [tex]r = 9183.7 \ m[/tex]
Explanation:
From the question we are told that
The speed of the jet plane is [tex]v = 600 \ m/s[/tex]
The acceleration is [tex]a = 4g[/tex] here [tex]g = 9.8 \ m/s^2[/tex] so [tex]a = 4* 9.8 = 39.2 \ m/s^2[/tex]
Generally the centripetal acceleration of the jet just before it pulled out of the circular section dive is mathematically represented as
[tex]a = \frac{v^2}{r}[/tex]
=> [tex]r = \frac{v^2}{a}[/tex]
=> [tex]r = \frac{600^2}{39.2}[/tex]
=> [tex]r = 9183.7 \ m[/tex]
My solar system has two types of planets: terrestrials and jovians. The solar nebula hypothesis offers what explanation for the different compositions of these two types of planets? A. The large gravitational forces of Jupiter tended to prevent planet formation in the inner solar system and eventually attracted most of the material into the region of the Jovian planets. B. During condensation, the heavier elements tended to sink nearer the Sun and, being rare, only provided enough material to build the relatively small terrestrial planets. C. The terrestrial planets were formed near the Sun where, because of the high temperatures, only heavier elements were able to condense. D. During the collapse of the gaseous nebula, most of the material tended to collect far from the Sun because of the large centrifugal forces, which provided the necessary material to build the large Jovian planets.
Answer:
B. During condensation, the heavier elements tended to sink nearer the Sun and, being rare, only provided enough material to build the relatively small terrestrial planets.
D. During the collapse of the gaseous nebula, most of the material tended to collect far from the Sun because of the large centrifugal forces, which provided the necessary material to build the large Jovian planets.
Explanation:
The solar nebular hypothesis is the theory of how the earth came to be as proposed and believed by most scientists. It states that the solar system was formed from a nebular which is a large collection of dust. As the condensation of the nebular progressed, the heavier materials which could withstand higher temperatures formed closer to the sun. Because these materials were not so much the planets formed by them were not large in size.
However, the Jovian planets formed beyond the frost line which could sustain icy compounds. The ices that formed these planets were much thus accounting for their larger sizes. Solar winds blew off the lighter hydrogen and helium elements leading to their accumulation far away from the sun.
what energy will be the highest at the bottom of a swing's path. (Hint: think
of energy in motion)
Answer:
Kinetic energy
Explanation:
The swing will have potential energy at all points before the lowest, where it will all be converted to kinetic.
A labor push a crate through 12m and 720 J of work .The magnitude of force was
Answer:
60 NExplanation:
The magnitude of the force can be found by using the formula
[tex]f = \frac{w}{d} \\ [/tex]
w is the workdone
d is the distance
From the question we have
[tex]f = \frac{720}{12} = 60 \\ [/tex]
We have the final answer as
60 NHope this helps you
A mass of 1 kg is moving in a circle of radius 3.3 meters. What is the liner velocity v m/s that would give a Centripetal Force of 23 N?
Answer:
The linear velocity of the object is 8.71 m/s.
Explanation:
Given;
mass of the object, m = 1 kg
radius of the circle, r = 3.3 meters
centripetal force, F = 23 N
Centripetal force is given by;
[tex]F_c = \frac{mv^2}{r}\\\\[/tex]
where;
v is the linear velocity of the object
[tex]F_c = \frac{mv^2}{r}\\\\mv^2 = F_cr\\\\v^2 = \frac{F_cr}{m}\\\\v= \sqrt{\frac{F_cr}{m}} \\\\v= \sqrt{\frac{23*3.3}{1}}\\\\v = 8.71 \ m/s[/tex]
Therefore, the linear velocity of the object is 8.71 m/s.
Coc and ball torture (CBT), ponies torture or dic torture is a sexual activity involving application of pain or constriction to the ponies or testcool. This may involve directly painful activities, such as genital piercing, wax play, genital spanking, squeezing, ball-busting, genital flogging, urethral play, tickle torture, erotic electrostimulation or even kicking. The recipient of such activities may receive direct physical pleasure via masochism, or emotional pleasure through erotic humiliation, or knowledge that the play is pleasing to a sadistic dominant. Many of these practices carry significant health risks
Answer:
CABT
Explanation:
Answer:
this is very valuable information
Explanation:
thanks for letting me know ahead of time
What term refers to substance in the environment that can cause abnormal fetal development
Answer:
Teratogens
Explanation:
Teratogens are substances or other factors that can cause congenital abnormalities, which are also called birth defects. Usually these abnormalities arise in the third to eighth weeks of pregnancy, when the major organ systems are forming.
Jerry's boat capsized last Saturday, he had been fishing with a friend. His friend made it to shore and went
for help, but it was too late. The boat was pulled out of the river and taken to the police station, Jerry's body
was found floating in the missouri river the next day. The police assumed after speaking with the friend, that
Jerry drowned, but a quick look at the body by the ME and the manner of death had to be listed as pending
investigation. The ME found petechial hemorrhaging and there was no water in his lungs.
What do you think actually happened? Provide evidence and reasoning for your claim
HELPPP
Answer:
the friend strangled Jerry to death then went to get help.
Explanation:
How does a magnetic field cause electric charges to form an electric current? O A. A force is exerted by the magnetic field on only the positive charges in the wire. B. Negative charges and positive charges are pushed in opposite directions by the magnetic field. C. A force is exerted by the magnetic field on only the negative charges in the wire. D. Negative charges and positive charges are pushed in the same direction by the magnetic field.
Answer:
Negative charges and positive charges are pushed in opposite directions by the magnetic field.
Explanation:
Just trust me.
The magnetic field causes electric charges to form an electric current which is responsible to push the positive and negative charges in the opposite direction because there is a magnetic field working as a magnetic effect of the electric current which results in negative charges and positive charges being pushed in opposite directions by the magnetic field. Therefore the correct option is B.
What is a magnetic field?A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted. The SI unit of the magnetic field is tesla.
The magnetic field is responsible for electric charges to form an electric current which results in pushing the positive and negative charges in the opposite direction.
There is a magnetic field working as a magnetic effect of the electric current which results in negative charges and positive charges being pushed in opposite directions by the magnetic field. Therefore the correct option is B.
Learn more about the magnetic fields from here
brainly.com/question/23096032
#SPJ5
The blood speed in a normal segment of a horizontal artery is 0.16 m/s. An abnormal segment of the artery is narrowed down by an arteriosclerotic plaque to one-eighth the normal cross-sectional area. What is the difference in blood pressures between the normal and constricted segments of the artery?
Answer:
The difference in blood pressures is [tex]P_1 -P_2 = 854.8 \ Pa[/tex]
Explanation:
From the question we are told that
The blood speed in a normal segment is [tex]v_1 = 0.16 \ m/s[/tex]
The area of the normal segment is [tex]A_1[/tex]
The area of the abnormal segment is [tex]A_2 = \frac{A_1}{8}[/tex]
Generally from continuity equation we have that
[tex]v_1 A_1 = v_2 A_2[/tex]
=> [tex]v_1 A_1 = v_2 * \frac{A_1}{8}[/tex]
=> [tex]0.16 = v_2 * \frac{1}{8}[/tex]
=> [tex]v_2 = 1.28 \ m/s[/tex]
Generally from Bernoulli's equation the difference in pressure is mathematically represented as
[tex]P_1 -P_2 = \frac{1}{2} \rho (v_2^2 - v_1^2 ) [/tex]
Here [tex]\rho[/tex] is the density of blood with value [tex]\rho = 1060 \ kg /m^3[/tex]
[tex]P_1 -P_2 = \frac{1}{2} (1060) ( 1.28 ^2 - 0.16 ^2 ) [/tex]
=> [tex]P_1 -P_2 = 854.8 \ Pa[/tex]
Which is the MOST accurate description of this type of cell?
O A) It is a eukaryotic cell.
OB) It is a prokaryotic cell.
OC) It does not contain DNA.
OD) It does not contain a membrane-enclosed nucleus.
helpppppppp first person who answers gets a brainly if it’s right
It would be
O A) It is a eukaryotic cell.
HURRY IM TIMED!!!!Anya knows the velocity of an object. What else does she need to know in order to find the object’s momentum? its mass its height its density its speed
Answer:
speed
and mass
Explanation:
Answer:
Mass
Explanation:
It isn´t multiple choice.
uses of concave lens
Answer:
Concave Lens Uses. Telescope and Binoculars Spectacles Lasers Cameras FlashlightsPeepholes. ...
Used in telescope and binoculars. ...
Concave lens used in glasses. ...
Uses of concave lens in lasers. ...
Use of concave lens in cameras. ...
Used in flashlights. ...
Concave lens used in peepholes.
In a computational model of energy changes experienced by an object in free fall, the value of 9.8 appears in several of the formulas. What does this value represent ? (1 point)
Answer:
1. acceleration due to gravity
2. =$B$2-9.8*C2
3. the total energy stays the same over time
4. the total energy of the object will decrease
5. the initial potential energy will increase
Explanation:
Answer:
The person below or above me is correct use this answer.
Explanation:
Which units could not be units for speed or velocity?
A. km/hr
B. m/kg
C. cm/min
D. mm/s
I'm pretty sure the answer is B. m/kg
According to Ohm’s law, which combination of units is the same as the unit for resistance? volt ÷ ampere ampere × volt volt + ampere ampere ÷ volt
Answer:
volt ÷ ampere
Explanation:
The mathematical form of Ohms law is given by :
V = IR
Where V is voltage
I is current
R is resistance
[tex]R=\dfrac{V}{I}[/tex]
The unit of voltage is volt and that of current is ampere
Unit of resistance :
[tex]R=\dfrac{\text{volt}}{\text{ampere}}[/tex]
So, volt ÷ ampere is the same as the unit of resistance. Hence, the correct option is (a).
Answer:
The answer is: volt ÷ ampere
Explanation:
Hope this helps. :)
If it's right, can you mark me as Brainliest.
1. Which is true about atmospheric convection
currents?
A. Heat is released from the oceans and land causing wind.
B. Wind is only caused by the rotation of the Earth.
C. Wind is caused by the polar ice caps
D. Wind is caused by the gravity of planets in our solar system.
Answer:
A. heat is released from the ocean and land causing wind.
A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g. If the collision is perfectly elastic, what is the velocity of each ball immediately after the collision?A. +6.7 m/s, -3.3 m/sB. -6.7 m/s, +3.3 m/sC. +3.3 m/s, -6.7 m/sD. -3.3 m/s, +6.7 m/s
Answer:
3.33m/sExplanation:
Using the law of conservation of momentum
m1u1 + m2u2 = (m1+m2)v
m1 and m2 are the masses of the object
u1 and u2 are the velocities
v is the final velocity
Given
m1 = 50g
u1 = 10m/s
m2 = 100g
u2 = 0m/s (stationary ball)
Required
Common velocity v
Substitute
50(10) + 100(0) = (50+100)v
500 = 150v
v = 500/150
v = 3.33m/s
Hence the velocity of each ball immediately after the collision is 3.33m/s
characteristics of good thermometer
What would happen if there was a sudden increase in the amount of greenhouse gases in Earth’s atmosphere?
Earth would suddenly cool down because more heat would leave the Earth system and go back to space.
Earth would suddenly cool down because solar radiation would not be able to flow through the atmosphere.
Earth would suddenly warm up because more heat from the atmosphere would be radiated toward Earth’s surface.
Earth would suddenly warm up because more heat from the Sun would be allowed to enter the atmosphere.
Answer:
Earth would suddenly warm up because more heat from the Sun would be allowed to enter the atmosphere.
Explanation:
The greenhouse gasses would make the ozone layer thinner letting in more harmful rays on the sun.
Hope this helps!! :)
Also I need one more brainliest if you dont mind giving it to me :)
Answer:
Earth would cool down because it would reflect more solar radiation. it would be A.
Explanation:
Please help I’m so desperate I’m giving about all my points
Answer:
1 and 5
Explanation:
potential energy is movement energy, and at 1 and 5 there is a lot of kinetic energy (built up energy) and not a lot of potential energy
How many shots does one get when he fouls a shooter? (basketball)
Answer:
Depends on where he was fouled
If it is beyond the 3 pt line, then it is 3
If it is within the 2 pt line, then it is 2
I hope that helps :)
Explanation:
Plz mark B R A I N L I E S T
The half-life of a substance is 10 years. What percent of the substance remains after 2 half-lives.
need answer asap. i think its 2.5 but not sure
Answer:
i think its 2.5 as well
Explanation:
2). If you record a wave going 4m/s and the Period of the wave was
60s, how long was the wave?
Answer:240 meters
Explanation:60×4
Please help me!!!
How much force is required to launch a 1 kg pumpkin 10 meters away from 5 meters off the
ground at a launch angle of zero degrees if it takes the catapult 0.1 seconds to fully launch the
pumpkin?
Answer:
F= 99 N
Explanation:
Dynamics and Kinematics
This problem is a combination of dynamics and kinematics because we need formulas and concepts of both branches of physics to solve it.
We need to calculate the force required to launch horizontally a pumpkin of m=1 Kg a distance of d=10 m away from a height of h=5 m.
Since the force is:
F = m.a
We need to calculate the acceleration required to move the pumpkin from rest (vo=0) to the launching speed (vf) in a time t=0.1 seconds.
The acceleration can be calculated by using the kinematic equation:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
The final launching speed vf can be calculated knowing the height and maximum horizontal distance reached by the pumpkin.
When an object is thrown horizontally with a speed vf from a height h, the range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v_f\cdot\sqrt{\frac {2h}{g}}[/tex]
Solving for vf:
[tex]\displaystyle v_f=d\cdot\sqrt{\frac {g}{2h}}[/tex]
Substituting:
[tex]\displaystyle v_f=10\cdot\sqrt{\frac {9.8}{2\cdot 5}}[/tex]
Calculating:
[tex]v_f=9.9\ m/s[/tex]
Now we calculate the acceleration:
[tex]\displaystyle a=\frac{9.9-0}{0.1}[/tex]
[tex]a= 99\ m/s^2[/tex]
Thus, the force required is:
[tex]F=1\ Kg\cdot 99\ m/s^2[/tex]
F= 99 N
A small barge is being used to transport trucks across a river. If the barge is 10.00 m long by 8.00 m wide and sinks an additional 3.85 cm into the river when a loaded truck pulls onto it, determine the weight of the truck and load.
Answer:
30214 N
Explanation:
To start with, we solve this problem by applying Archimedes’ principle. We say that the weight of the truck and the weight of load is equal to the weight of the additional water displaced when the truck and the load moves onto the barge. Thus,
Volume of water displaced = 10.00 m * 8.00 m * 0.0385 m = 3.08 m³.
Density of water = 1000kg/m³
Mass of water displaced = volume * density
Mass of water displaced = 3.08 * 1000 = 3080 kg
Weight of water displaced (mg) = 3080 x 9.81 = 30214 N
Therefore, the Weight of truck + load = 30214 N
An object at rest will stay at rest, and an object in motion will stay in
motion, unless acted upon by an unbalanced force is known as which Law
of Motion?
Answer:
It is Newton's first law of motion also referred to as the law of inertia.
Explanation: