Page 1 CDBDDDBDBAACAAD
Page 6 CBDBABDABBACBDDBDABB
Page11dcdcdccadbcbbc
Page 17
Page 22 CADCCAABCBABBDB
Page 27 CADBDCDCDBCAABB
Page 33 BDCDBDBDAADAADB
Page 39 BDCAABDCBBAAAAB
The first page of mathematics multiple choice questions BBBCBBACCD
Page 5 DACBDDBD
Page 9 CDCB
Page 13 CDDAAC
Page 17 BBDCCCB
Page 2 1 page DC
Page 25 DDACBCDCBBC
Page 29 CCBBADDA
Page 33 CBAAAD
Page 37 ABCADDAC
Page 4 1 AAADDCBBCC
physics
Exercise 4:
1. Multiple choice questions: 1. D2 a3 . C4 . D5 . B6 . C7 . c8 . a9 . c 10。 D 1。 A 12。 D 13.A668。
Second, fill in the blanks and draw questions:
16. inertia; Inertia17.2; 2。 18.4; 5。 19. Left; Zero. 20. 12; 12。
2 1. Mutual; Inertia; Gravity; The gravity of the ball.
22. No; Inertia.
23.( 1): unchanged; No. (2): disobedience; Space is a vacuum. (3):29048; 8069.(4): When the spacecraft landed, the gravity was greater than the resistance. The purpose of spraying fire on the ground was to increase the resistance and make the spacecraft land slowly.
Third, answer and explore questions:
24.( 1): smooth; Equality. (2): The two forces are equal; Same straight line.
( 1):d(2):far； Balance force.
26.( 1): the number of paper clips hanging under the umbrella (2): the number increases and the falling time decreases; When the quantity increases, the falling time increases.
(3): Inquiry scheme: directly measure the parachute falling time.
① Experimental equipment: different numbers of paper clips, stopwatches, etc.
② Experimental steps: a. Release any parachute from the balcony and measure its falling time t1;
B repeat the test by changing parachutes (hanging different numbers of paper clips), measure the falling time t2, and compare the size of t 1 and t2.
Please tell me if you have an English answer.