Re: 幫智崧問 物理習題
4. (I) A car travels east at 20 m/s for 10s and then north at 10 m/s for 15s.
Find:
(a) the distance covered:
(b) the displacement;
(c) the average velocity;
(d) the average speed;
(e) the average acceleration.
4. (我) 一輛汽車以 20 m/ s 10 年代向東方行進然後向北以 10 m/ s 行進15秒。
發現: (a) 距離涵蓋: (b) 換置; (c) 平均的速度; (d) 平均的速率; (e) 平均的加速度。
6. (Ⅱ) On May 20-21 , 1927 , Charles Lindberg flew the Spirit of
St. Louis nonstop from New York to Paris, a distance of 5819 km, in 33.5h
, What was the magnitude of his average velocity?
(Radian measure is needed.)
6. (Ⅱ)1927 年五月 20-21 日﹐查爾斯 Lindberg 搭了從紐約到巴黎的聖路易斯
直達飛機, 5819 km 的距離花費了33.5 hr中﹐他的平均速度的大小是什麼?
(弧度方式被需要)。
36. (Ⅱ) A stone is thrown at 25 m/s at 50° above the horizontal. At what
time(s) is its velocity at 30° to the horizontal?
36. (Ⅱ)一塊石頭被以 25 m/ s 以在水平線上面的 50 ° 丟。 時間 (s)
是以 30 ° 對水平線它的速度?
60. (Ⅱ) A fish swimming east at 3 km/h is spotted by a penguin that is 50m
due south. If the penguin is capable of moving at 30 km/h under water, how
quickly could it have a meal?
60. (Ⅱ)一條以 3 km/hr 向東方游泳的魚被一隻 在東西南方50m的企鵝看見。
如果企鵝能夠以在水下面的 30 km/ h 移動, 多久之後牠可以有一餐可吃?
62. (Ⅱ) The speed of a car moving along a circular track of radius 50m
is increased uniformly in time. When the car is east of the center,
its total acceleration is 10 m/(※s平方) at 37° W of N. (a) Find its
radial and tangential accelerations. (b) How long does it take to return t
o the same point?
62. (Ⅱ)向前移動半徑 50 m 的一個圓形的軌道 的汽車速度統一地及時被增加。
當汽車中心是向東方的時候,它的總加速是 10 m/(※ s 平方)以 N 的 37 ° W。
(a) 找出它的光線和切線的加速。 (b) 它花多久的時間回到相同的點?
78. (Ⅱ) A child tosses a ball at 12 m/s at 35° above the horizontal
toward a wall 7.2 m away. The ball leaves the hand at a height of 1.6 m.
Find the height and angle at which the ball hits the wall.
78. (Ⅱ) 一個孩子以 12 m/ s 投擲一個球在對於牆壁 7.2 m 的水平線上面的 35 °
之遠。 球以 1.6 m 的高度留下手。 發現高度和角度在那一個球擊中牆壁。
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