The spaceship rises at a constant acceleration of a = G2. Due to the overweight phenomenon, the weight of an object with a mass of 10kg measured by a spring scale is 75n? (earth radius is 6400km, g = 10m / S2)

According to Newton's second law, f-mg ′ = ma, the solution is g ′ = 2.5m/s2. According to universal gravitation equals gravity, gmmr2 = mggmm (R + H) 2 = mg ′, R + H = 2R, H = r = 6400km. A: the altitude of the spaceship from the ground is 6400km

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1. One person stands on the scale, its indication is 500N, another hanging spring scale bottom hangs an object of 300N When the person pushes up the object with a force of 100 N, what is the indication of the spring scale? What is the indication of the scale? When the person pulls down the object with a force of 50 N, what are the indication of the spring scale and the scale? Why?
2. When the object with a mass of 50g is suspended under the spring scale, when the spring scale moves upward with uniform acceleration and linear motion of 1.2m/s2, what is the indication? When the spring scale moves upward with uniform deceleration and linear motion of 1.2m/s2, what is the indication?
3. Use the spring scale to pull an object horizontally to move at a constant speed, the number is 0.6N, and then pull it to do a uniform acceleration movement, the reading is 1.8n, 4, and calculate its mass
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5. The metal block m is clamped in a rectangular box with compressed light spring, as shown in the figure. The upper and lower plates of the box are equipped with pressure sensors. The box can move along the vertical track, and the metal block never leaves the upper plate. When the box moves vertically with a = 2.0m/s2 acceleration, the pressure of the upper plate is 6.0N, and the pressure of the lower plate is 6.0N 0 n. (g = 10m / S2) (1) what is the gravity of the metal block? (2) If the indication of the upper roof pressure sensor is 0.4 times that of the lower floor pressure sensor, try to find the acceleration value and direction of the box. (3) to make the indication of the upper roof pressure sensor zero, what is the possible situation of the box moving along the vertical direction?
6. The metal block m is clamped in a rectangular box with compressed light spring, as shown in the figure. The pressure sensors are installed on the top and bottom plates of the box, and the box can move along the vertical track. When the box moves upward with a = 2.0 M / S2 acceleration, the pressure displayed by the sensor on the top plate is 6.0 n, and the pressure displayed by the sensor on the bottom plate is 10.0 n Where can this thing be used in real life? Please give an example
7. The metal block m is clamped in a rectangular box with a compressed light spring. Pressure sensors are installed on the upper and lower roof plates of the box. The box can move along the vertical track. When the box moves vertically at a constant deceleration with an acceleration of 6m / S ^ 2, the pressure displayed by the pressure sensor on the upper roof is 6N, and the pressure displayed by the pressure sensor on the lower floor is 10N, What might the vertical motion of the box look like? When the pressure of the upper roof is exactly equal to zero, Mg-F = ma2, the acceleration A2 = - 10 m / S2 is obtained How did you get that?
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16. A rope with length of L = 60cm is tied with a small ball, which moves in a circle in the vertical plane. Given the mass of the ball M = 0.5kg, find: (1) try to determine the minimum centripetal force when it reaches the highest point; (2) the minimum speed when the ball reaches the highest point and continues to move in a circle; (3) when the speed of the ball at the highest point is 3m / s, the pull of the rope on the ball. (g = 10m / S2)
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