ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Í¼¼×ÊÇijÈËÕ¾ÔÚÁ¦´«¸ÐÆ÷ÉÏ×ö϶ס¢ÆðÌø¶¯×÷µÄʾÒâͼ£¬µãPÊÇËûµÄÖØÐÄλÖá£Í¼ÒÒÊǸù¾ÝÁ¦´«¸ÐÆ÷²É¼¯µ½µÄÊý¾Ý×÷³öµÄÁ¦-ʱ¼äͼÏß¡£Á½Í¼ÖÐa¡«g¸÷µã¾ù¶ÔÓ¦£¬ÆäÖÐÓм¸¸öµãÔÚͼ¼×ÖÐûÓл³ö¡£gÈ¡10m/s2¡£¸ù¾ÝͼÏñ·ÖÎö¿ÉÖª£¨ £©
A. ´ËÈ˵ÄÖØÁ¦Îª750N
B. bµãÊÇ´ËÈË϶×ÖÁ×îµÍµãµÄλÖÃ
C. ´ËÈËÔÚfµãµÄ¼ÓËٶȵÈÓÚÁã
D. ´ËÈËÔÚdµãµÄ¼ÓËٶȵÈÓÚ20m/s2
¡¾´ð°¸¡¿D
¡¾½âÎö¡¿aͼÈË´¦ÓÚƽºâ״̬£¬´«¸ÐÆ÷µÄʾÊý´óСµÈÓÚÈ˵ÄÖØÁ¦£¬¼´mg=500N£¬ËùÒÔA´íÎó£»ÈËÔÚ϶׵Ĺý³ÌÖÐÏȼÓËÙºó¼õËÙ£¬bµãÈ˶Դ«¸ÐÆ÷µÄѹÁ¦×îС£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£º £¬ÏòϵļÓËÙ¶È×î´ó£¬²»ÊÇ×îµÍµã£¬¹ÊB´íÎó£»fµãÈ˶Դ«¸ÐÆ÷ѹÁ¦ÎªÁ㣬¼´ÈËÀ뿪´«¸ÐÆ÷£¬¼ÓËٶȵÈÓÚg£¬C´íÎó£»ÔÚdµã£¬½âµÃ¼ÓËÙ¶Èa=20m/s2£¬DÕýÈ·¡£
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿