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Right triangle area formula
S=ab/2
Where AB is the side length of two right angles!
How to calculate the area of a right triangle and what is the formula?
Bottom multiplied by height divided by 2
Area formula of right triangle If the three sides of a right triangle are 10cm, 8cm and 6cm respectively, then the area of the right triangle is () square centimeters
“liu630799935”：
The area of a right triangle is the product of two right sides and divided by two
8 cm × 6cm ÷ 2 = 24cm2
Are you right? Good bye
If we suddenly increase the centripetal force of an object in uniform circular motion, what will change That is, the centripetal force determines what size If we don't know whether it moves in a circular motion at a uniform speed after increasing the centripetal force, what is the impact of increasing the centripetal force?
To see what the size of the centripetal force determines, we need to see its definition formula F = (mv_2) / R. V is the linear velocity and R is the radius. In general motion with a velocity less than the speed of light, the mass will not change, so the centripetal force will only affect the linear velocity and motion radius and determine their size. Therefore, in the subject, in uniform motion, increase the centripetal force, that is, V remains unchanged, f becomes larger, and the radius will inevitably decrease
The centripetal force on an object moving in a uniform circular motion must be the same as () A is directly proportional to the square of linear velocity B is inversely proportional to the square of angular velocity C is inversely proportional to the radius of motion D is directly proportional to the product of linear velocity and angular velocity
F centripetal force = MV ^ 2 / r = MW ^ 2R = m (2 Pai / T) r = mvw
W is the angular velocity
According to the formula, you can know
A. D correct
B should be proportional
C should mean that when the speed is constant, it is inversely proportional
Try to find the centripetal force of a object moving in a uniform circular motion 7. As shown in the figure, the mass of both objects a and B is kg, Object a moves in a uniform circular motion on a smooth horizontal plane, and object B moves in a circular motion Under the action of a horizontal external force of 4.0 n, start from rest and follow the direction Move towards A. now both objects a and B start from position P at the same time Motion, when object a moves around point O for two weeks, a and B are just at point P Points meet. When a goes around for another half a circle, it meets B at Q. try A centripetal force of a body moving in a uniform circular motion
Set the radius r, period T and angular velocity of circular motion ω The acceleration of object B is a = f / M = 4.0 / 1.0 = 4 (M / S ^ 2) o'p = (1 / 2) at ^ 2 = (1 / 2) 4 (2t) ^ 2 = 8t ^ 2o'q = o'p + 2R = 8t ^ 2 + 2R = (1 / 2) a (2.5t) ^ 2 to obtain r = (9 / 4) T ^ 2 centripetal force F = M（ ω)^ 2R=m(2π/T)^2R=1*(4*π^2/T^2)*(9/4)...
RELATED INFORMATIONS
- 1. The centripetal force of an object in uniform circular motion is a constant force, right?
- 2. The resultant force of each force on an object moving in a uniform circular motion must be a centripetal force Why is it wrong
- 3. There are four line segments with the length of 1.2.3.4 respectively. The probability that any three of them will form a triangle is
- 4. If the three sides of an obtuse triangle are a + 1, a + 2 and a + 3, the value range of a is __
- 5. Four conditions for friction Is it 1. Objects contact and squeeze each other 2. The contact surface is not smooth 3. Relative motion or relative motion trend between objects 4. There is elasticity between objects
- 6. Are the objects on the horizontal conveyor belt subject to friction The conveyor belt is horizontal with an object moving forward at a uniform speed. Is this object subject to friction? If it's moving from rest to uniform speed, is there friction
- 7. As shown in Figure 2, a disk rotates at a uniform speed around the vertical axis passing through the center in the horizontal plane, and a small object on the disk is stationary relative to the disk and moves with the disk. The centripetal force on the object is correct in the following statement: a A. The direction of the centripetal force points to the center of the disc B. the direction of the centripetal force is the same as the speed direction of the object C. The centripetal force direction is parallel to the rotating shaft D. the centripetal force direction remains unchanged The disc rotates counterclockwise
- 8. When the wood block with mass of M = 1kg is stationary on the platform with height of H = 1.2m, the dynamic friction coefficient between the wood block and the platform As shown in the figure, the wood block with mass of M = 1kg is still at the height of H = 1.2m Dynamic friction coefficient between wood block and platform on platform μ= 0.2, with horizontal thrust f = 20n, Remove the wood block when it has a displacement of S1 = 3M, and fly out of the platform when it slides again and S2 = 1m, Find the speed of the wooden block when it falls to the ground? ( )
- 9. As for friction, the correct one in the following statement is () A. The direction of sliding friction is always opposite to the direction of motion of the object B. Sliding friction always hinders the relative motion between objects C. The magnitude of the friction force must be proportional to the pressure between the contact surfaces D. The direction of friction can be perpendicular to the direction of motion of the object
- 10. Why should the trajectory of the particle with the longest flight time in a magnetic field be tangent to the boundary of the magnetic field
- 11. How to prove the formula of the relationship between the radius of the inscribed circle and the trilateral of a right triangle?
- 12. How to determine the direction of friction in physics?
- 13. Determine the direction of friction Many books explain that a bicycle moves at a uniform speed when it is stepped on by people, so the front wheels are subject to backward friction The front wheel does not rotate forward as the rear wheel does. Why is the rear wheel backward and the front wheel ahead? thank
- 14. Why can the direction of friction be perpendicular to the direction of motion of an object?
- 15. Does the hand of an object moving at a uniform speed on the conveyor belt have the effect of friction,
- 16. The object with mass m is stationary on the horizontal desktop, and the dynamic friction coefficient between the object and the desktop is μ， Now push the object with a horizontal force to accelerate the object for a period of time. Remove the force, and the object will slide for a period of time and then stand still. Given that the total distance of the object is s, what is the work done by this thrust to the object?
- 17. It is known that the circumference of an isosceles triangle is 30 cm and the length of one side is twice the length of the other. Find the length of its three sides
- 18. 7. The object with mass m is pulled by a string through a smooth small hole, and makes a uniform circular motion on a smooth horizontal plane. When the tension is a certain value f, it rotates When the tensile force is a certain value f, the rotation radius is R. when the tensile force gradually increases to 6F, the object still moves in a uniform circular motion. At this time, the radius is R / 2, then the work done by the tensile force on the object is: () A、0 B、FR C、3FR D、5FR/2
- 19. A small object with a mass of 0.05 kg is placed on a smooth horizontal table. One end of a rope is connected to the object, and the other end passes through the small hole in the center of the table. The object originally rotates on the circumference 0.2 m away from the hole at an angular speed of 3 rad / s. now pull the rope down slowly from the small hole to reduce the rotation radius of the object to 0.1 M. then the angular speed of the object
- 20. As shown in the figure, a small ball with a mass of M is hung with a thin rope with a length of L and placed on a smooth spherical surface with a radius of R. the minimum distance from the suspension point to the spherical surface is D, then how much pressure does the small ball have on the spherical surface? What is the tension of the rope?