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Anonymous users2024-02-111.Uniform acceleration, the acceleration is 6, a and b are 1 (seconds) (10 + 4) 2 7 (m), and the velocity is the smallest at point a, that is, the distance a is 0
2.Uniform deceleration, i.e., the velocity of the particle moving to the right of b is reduced to 0, and then accelerating to the left, and the speed to the left when it reaches b is 10The acceleration to the left is (10+4) 1=14, and the time when the velocity is reduced from 4 m s to 0 is 4 14s, and the distance a is (4 m s 4 14s) 2=4 7 m.
The particle is at point B, and the velocity size vb=10m s; At this point, the direction of the velocity must be to the left, or you won't be able to do it.
It can be seen that the velocity change of this particle is first decreased from 4m s to 0, and then increased to 10m s, which is a uniform deceleration linear motion, and the minimum speed is 0.
It can be seen that the magnitude of acceleration is a=(10+4) 1=14m s
The change in velocity is from 4m s to 0 first, and the time required is t=v a=4 14=s.
The distance from point A is s=m.
I wish the landlord a good progress!
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Anonymous users2024-02-10The particle is at point B, and the velocity size vb=10m s; At this point, the direction of the velocity must be to the left, or you won't be able to do it.
It can be seen that the velocity change of this particle is first decreased from 4m s to 0, and then increased to 10m s, which is a uniform deceleration linear motion, and the minimum speed is 0.
It can be seen that the acceleration is a=(10+4) 1=14m s, and the change in velocity is first reduced from 4m s to 0, and the required time is t=v a=4 14=s.
The distance from point A is s=m.
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Anonymous users2024-02-091. C density will not excitate forest changes.
2. The direction of gravity is that the lead is vertically downward, not vertically on the ground.
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Anonymous users2024-02-08bMass is the fundamental property of an object.
The volume changes with temperature.
b. Gravity touches the direction of Ming Tsai, pointing to the ground and the heart of Huai.
If it's vertical, if it's an inclined plane, it won't point to the center of the earth
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Anonymous users2024-02-071.The same substance, the state changes, the density p changes to the nuclear front base change.
For the same object, the state changes and the mass m does not change.
According to the formula p=m v, the front can be changed to know that m does not change, p changes, v changes.
So choose B2Shape.
The direction of gravity is always straight downward.
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Anonymous users2024-02-06, the mass does not change, because the shape changes, so its volume has changed, ACD is wrong.
Due to the rotation of the earth, centrifugal force is generated, so gravity is the resultant force of gravitational force and centrifugal force, the direction of gravitational force points to the center of the earth, and the direction of centrifugal force is not fixed, and it is related to the latitude in which it is located.
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Anonymous users2024-02-051.Under the action of constant resultant external force and drag, the acceleration is A11 2A1(4) = 8m
a1=1m/s²
After turning off the engine, the speed of turning off the engine is 4m s and the car moves for 2s to stop, and the acceleration is a2 = 2m s drag f = 2 * 2000 = 4000n
f (traction) - f = 2000*1
f=6000n
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Anonymous users2024-02-04There are the answers and processes you need!!
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Anonymous users2024-02-03This is very simple, so you can think about why the satellite revolves around the earth and does not fall? The reason is that when the object is moving in a circular motion at a speed, that is to say, it is not moving in a uniform straight line, if the object is moving in a circular distance, then the velocity of the object at a certain moment should be the direction of a tangent line of its circle, you can see that if there is no pull force on the object at this moment, the object will fly out and move far along the straight line. So, when doing a circular motion, if the support force of the stool on the person is equal to the gravitational force, it means that the net force of the person is zero, and the person will fly away.
There is no force pulling people, making people move in a circle. In other words, in the process of doing a circular motion, the support of the seat will be reduced.
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Anonymous users2024-02-02Because the amount of air has changed.
Gravity is not equal to the gravitational pull of the Earth on an object. Due to the rotation of the earth itself, in addition to the poles, the objects in other places on the ground are moving in an approximate uniform circular motion around the earth's axis together with the earth, which requires a centripetal force directed perpendicularly to the earth's axis, and this centripetal force can only be provided by the earth's gravitational force on the object, and we can decompose the earth's gravitational force on the object into two components, one component f1, which points to the earth's axis, and the magnitude is equal to the centripetal force required for the object to move in an approximate uniform circular motion around the earth's axis; The other component g is the gravitational force on the object, where f1 = mw2r (w is the angular velocity of the earth's rotation and r is the radius of rotation of the object), and it can be seen that the magnitude of f1 is zero at the poles, increasing with the decrease of latitude, and the maximum f1max is in the equatorial region. Because the centripetal force of the object is very small, in general, it can be approximated that the gravitational force of the object is equal to the gravitational force, that is, the influence of the rotation of the earth can be omitted in general. >>>More
The so-called dividing line has no width, just like the line in a geometry problem, you will never consider its width. Without width, how can it be divided into two hemispheres? >>>More
In order to increase the pressure and thus the friction.
Because each additional point of area is also under pressure, the pressure increases and the friction increases, i.e., the friction at the same point of contact remains the same, but there are more of these points. So the friction has become greater overall. >>>More
The answer is 5 times the root number 2 Newton.
Process Because of equilibrium, a force other than the force of 5n of rotation can be regarded as a force of magnitude 5n, and the direction is opposite to the force of rotation, and after rotation, it becomes a combination of two forces of magnitude of 5n perpendicular to each other, and then the force is combined. >>>More
The time value of a beat is not fixed. Usually every piece of music will have a mark like "one note = n", which means that n of these notes will be played every minute, and usually such notes marked on it are one beat. >>>More