0.5h等于多少s
1800秒。1小时等于3600秒，0.5小时，（0.5×3600）秒等于1800秒。秒是国际单位制中时间的基本单位，符号是s。会借用英文缩写标示为sec.1。
绛旓細锛1锛夆埖1m/s=3.6km/h锛屸埓5m/s=5脳3.6km/h=18km/h锛涳紙2锛夆埖1h=3600s锛屸埓0.5h=0.5脳3600s=1800s锛涳紙3锛夆埖1m=10-3km锛屸埓500m=500脳10-3km=0.5km锛庢晠绛旀涓猴細锛1锛18锛涳紙2锛1800锛涳紙3锛0.5锛
绛旓細鈶犫埖1km/h=13.6m/s锛屸埓108km/h=108脳13.6m/s=30m/s锛涒憽鈭1h=60min锛屸埓0.5h=0.5脳60min=30min锛涒埖1h=3600s锛屸埓0.5h=0.5脳3600s=1800s锛涒憿鈭1cm=104渭m锛屸埓2.7cm=2.7脳104渭m锛涒懀鈭1nm=10-6mm锛屸埓56nm=56脳10-6mm=5.6脳10-5mm锛涒懁鈭1m/s=3.6km/h锛屸埓2m/s=2脳...
绛旓細30min 1800s
绛旓細鏁扮悊绛旂枒鍥负鎮ㄨВ绛旓紝甯屾湜瀵逛綘鏈夋墍甯姪銆1800s = 1800/(60*60) = 0.5h 绁濅綘瀛︿範杩涙锛屾洿涓婁竴灞傛ゼ锛 (*^__^*)
绛旓細涓锛0.005km=(50)dm=(5000)mm 浜岋紝0.4cm=锛4脳10鐨勫叚娆℃柟锛夌撼绫=锛4锛塵m 涓夛紝0.5h=锛1800锛塻=锛1.8脳鐨勫叚娆℃柟锛塵s 鍥涳紝6*10鐨勫叓娆℃柟us=锛600锛塻=锛10锛塵in
绛旓細锛1锛1m/s=3.6km/h锛屸埓20m/s=20脳3.6km/h=72km/h锛涳紙2锛1m=106渭m=109nm锛1mm=1000渭m锛屾墍浠27mm=27脳1000渭m=2.7脳104渭m锛涳紙3锛1h=3600s锛屾晠0.5h=0.5脳3600s=1800s锛涳紙4锛1m=106渭m=109nm锛涙晠9nm=9脳10-9m锛涙晠绛旀涓猴細锛1锛72锛涳紙2锛2.7脳104锛涳紙3锛1800锛涳紙...
绛旓細鏃堕棿鐨勫崟浣嶏細鏃讹紙H锛夛紝鍒嗭紙M锛夛紝绉掞紙S锛夛紝閭ｄ箞瀹氭椂鍣ㄤ笂0.5H灏鏄鍗婂皬鏃讹紝30鍒嗛挓锛圡锛夈1H灏辨槸1涓皬鏃讹紝60鍒嗛挓锛圡锛夈傚畾鏃跺櫒锛屾槸涓绉嶇敤浜庢帶鍒舵椂闂寸殑瑁呯疆锛屾槸鎺у埗寮鍏虫垨宸ヤ綔鏃堕棿鐨勪华鍣ㄣ備富瑕佺被鍨嬫湁锛屾帴閫氬欢鏃跺瀷瀹氭椂鍣ㄣ佹柇寮寤舵椂鍨嬪畾鏃跺櫒銆佷繚鎸佸瀷鎺ラ氬欢鏃跺畾鏃跺櫒鍜岃剦鍐插瀷瀹氭椂鍣ㄧ瓑銆
绛旓細宸茬煡锛s=60km=60000m锛宼=5min=300s锛宼1=0.5h=1800s锛岄偅涔堟牴鎹熷害鍏紡v=st=60000m300s=200m/s锛屽垯璇ラ鏈洪琛0.5h閫氳繃鐨勮矾绋媠1=vt1=200m/s脳1800s=360000m锛岀敱浜庨鏈哄仛鍖閫熺洿绾块琛岋紝鎵浠ュ湪绗簩鍒嗛挓鏃剁殑閫熷害涓庡钩鍧囬熷害鐩哥瓑鍗充负200m/s锛屾晠绛旀濉細360000锛200锛
绛旓細1. 瀵逛簬绔栫洿涓婃姏鐨勭墿浣擄紝宸茬煡骞冲潎閫熷害涓20m/s锛屾垜浠彲浠ラ氳繃鐗╃悊鍏紡璁＄畻浠庢姏鍑哄埌钀藉洖鎶涘嚭鐐规墍闇鐨勬椂闂淬傜敱浜庣墿浣撳湪涓婂崌鍜屼笅闄嶉樁娈电殑閫熷害澶у皬鐩哥瓑锛屾晠鍒濋熷害鍜屾湯閫熷害鐨勫拰涓20+20=40m/s銆傛牴鎹叕寮忥細鐗╀綋鍙婂垵閫熷害涓20m/s锛屽垯鎬绘椂闂碩=40/10=4绉掋2. 涓婂崌鐨勬渶澶ч珮搴H鍙互閫氳繃鍏紡璁＄畻锛欻=v^2/2g...
绛旓細s=0.7*0.3+0.7*0.5*2+0.3*0.5*2=1.21 h=(63/1000)/(0.7*0.3)=0.3
