標題:
發問:
AL physics 1981 paper 1 #34點做 ?Projectiles P and Q are launched simultaneously from the top of a cliff. P is launched horizontally with speed 20 ms-1 , and Q is launched at an angle of 60(degree) above the horizontal with the speed 40ms-1which of the following statement is / are correct ?1. P and Q... 顯示更多 AL physics 1981 paper 1 #34 點做 ? Projectiles P and Q are launched simultaneously from the top of a cliff. P is launched horizontally with speed 20 ms-1 , and Q is launched at an angle of 60(degree) above the horizontal with the speed 40ms-1 which of the following statement is / are correct ? 1. P and Q travel equal vertical distances in equal times 2.P and Q travel equal horizontal distances in equal times 3.P and Q never meet
最佳解答:
1. This is wrong. As P and Q have different initial vertical component of velocity, and they have the same vertical acceleration, so they will not travel the same vertical distances in equal times. 2. This is correct. Horizontal component of velocity of P = 40cos60* = 20 ms-1 which is equal to the horizontal component of velocity of Q. So, they will travel the same horizontal distances in equal times. 3. This is correct. As there is an initial vertical component of velocity of P, but there is not for Q, so they will occupy the different vertical displacement in equal times, which implies they will not meet together in any time.
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AL physics 1981 paper 1 #34 ( 20點 )發問:
AL physics 1981 paper 1 #34點做 ?Projectiles P and Q are launched simultaneously from the top of a cliff. P is launched horizontally with speed 20 ms-1 , and Q is launched at an angle of 60(degree) above the horizontal with the speed 40ms-1which of the following statement is / are correct ?1. P and Q... 顯示更多 AL physics 1981 paper 1 #34 點做 ? Projectiles P and Q are launched simultaneously from the top of a cliff. P is launched horizontally with speed 20 ms-1 , and Q is launched at an angle of 60(degree) above the horizontal with the speed 40ms-1 which of the following statement is / are correct ? 1. P and Q travel equal vertical distances in equal times 2.P and Q travel equal horizontal distances in equal times 3.P and Q never meet
最佳解答:
1. This is wrong. As P and Q have different initial vertical component of velocity, and they have the same vertical acceleration, so they will not travel the same vertical distances in equal times. 2. This is correct. Horizontal component of velocity of P = 40cos60* = 20 ms-1 which is equal to the horizontal component of velocity of Q. So, they will travel the same horizontal distances in equal times. 3. This is correct. As there is an initial vertical component of velocity of P, but there is not for Q, so they will occupy the different vertical displacement in equal times, which implies they will not meet together in any time.
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