On October 15, 2003, Shenzhou-5 spacecraft was successfully launched into space by the long march-2f high thrust rocket, marking a new page in China's space technology. Please answer the following questions based on your physical knowledge: 1) during the normal operation of the spacecraft, the mass of the astronauts in weightless condition______ (fill in "changed" or "unchanged")______ Inertia (fill in "no" or "still have"). ② if the spaceship travels in space for 21 hours, makes 14 circles around the earth, and flies about 610000 km, the speed of the spaceship is about______ Km / h. (integer)

On October 15, 2003, Shenzhou-5 spacecraft was successfully launched into space by the long march-2f high thrust rocket, marking a new page in China's space technology. Please answer the following questions based on your physical knowledge: 1) during the normal operation of the spacecraft, the mass of the astronauts in weightless condition______ (fill in "changed" or "unchanged")______ Inertia (fill in "no" or "still have"). ② if the spaceship travels in space for 21 hours, makes 14 circles around the earth, and flies about 610000 km, the speed of the spaceship is about______ Km / h. (integer)

(1) Mass is a basic attribute of an object. When the position of the object changes, the mass of the object does not change. Inertia is an inherent attribute of all objects. As long as the object has mass, it will have inertia. And any object has mass. So any object has inertia, so the spacecraft still has inertia

China's Shenzhou-6 spacecraft was successfully launched by the long march-2 carrier rocket at Jiuquan space launch site on October 12, 2005. If the total mass of the long march-2 carrier rocket and the spacecraft is 1.0 × 10 ^ 5kg, the takeoff thrust is 3.0 × 10 ^ 6N, and the launch tower is 160m high
(1) What is the acceleration of the launch vehicle when it takes off from the ground?
(2) How long does it take for a launch vehicle to fly away from the launch tower if the thrust of the launch vehicle remains unchanged while ignoring all the changes in drag and mass of the launch vehicle?
(3) How much pressure did the astronauts in the spaceship bear during this period
The answer is (1) 20m / S ^ 2 (2) 4S (3) 1950n

The gravity of launch vehicle and spaceship during take-off is: g = mg = 1.0 × 10 ^ 5kg × 10kg / S & sup2; = 1.0 × 10 ^ 6N the combined external force of launch vehicle and spaceship during take-off is: F = f push-g = 3.0 × 10 ^ 6n-1.0 × 10 ^ 6N = 2 × 10 ^ 6N  the acceleration of launch vehicle when take-off and leaving the ground is: a = f / M = 2 × 10 ^ 6N ÷ 1.0 × 10 ^

It is reported that China's Long March 2F carrier rocket will send shenzhou-10 spacecraft into space in mid June. During the ascent of the rocket, the surface temperature of its head will rise sharply. Please explain why with your physical knowledge?

In the process of rocket rising, it is necessary to overcome the air friction to increase the internal energy and temperature of the rocket head surface