Txheeb xyuas qhov siab tshaj plaws ntawm kev txav mus los ntawm projectile

Tau daws cov teeb meem hauv kev txav mus los ntawm projectile - txiav txim siab qhov siab tshaj plaws

1. Ib lub pob ncaws pob uas raug ncaws tawm hauv av ntawm lub kaum sab xis θ = 60 ^o nrog rau qhov ceev pib ntawm 10 m/s. Xam qhov siab tshaj plaws! Kev nrawm ntawm lub ntiajteb txawj nqus yog 10 m/s ².

Paub:

Lub kaum sab xis (θ) = 60 ^o

Qhov ceev pib ( _v₂o ) = 10 m/s

Xav tau: Qhov siab tshaj plaws (h)

Tshuaj:

Feem ntsug ntawm qhov ceev pib:

sin 60 ^o = v _oy / v _o

v _oy = v _o sin 60 ^o = (10)( sin 60 ^o ) = (10)(0.5 √ 3 ) = 5 √ 3 m/s

Xaiv qhov kev taw qhia mus rau sab saud ua qhov zoo thiab qhov kev taw qhia mus rau sab hauv ua qhov tsis zoo.

Paub:

Kev nrawm ntawm lub ntiajteb txawj nqus (g) = -10 m/s ² (tsis zoo downward)

Qhov feem ntsug ntawm qhov ceev pib (v _oy ) = + 5 √ 3 m/s (zoo rau sab saud)

Qhov ceev kawg ntawm qhov siab tshaj plaws (v _ty ) = 0

Xav tau: Qhov siab tshaj plaws (h)

Tshuaj:

vt2 = _vo2 + ^{2 gh}_​

0 ² = ( 5 √ 3) ² + 2 (-10) teev

0 = 2 5 ( 3 ) – 20 teev

0 = 75 – 20 teev

75 = 20 teev

h = 75 / 20

h = 3.75 meters

Qhov siab tshaj plaws yog 3.75 meters.

[irp]

2. Ib lub cev raug nthuav mus rau saum ntuj ntawm lub kaum sab xis 30 ^° nrog rau kab rov tav ntawm lub tsev siab 20 meters. Nws qhov ceev pib yog 4 m/s. Xam qhov siab tshaj plaws! Kev nrawm ntawm lub ntiajteb txawj nqus yog 10 m/s ².

Paub:

Lub kaum sab xis (θ) = 30 ^o

Qhov siab pib (h) = 20 meters

Qhov ceev pib ( _v₂o ) = 4 m/s

Kev nrawm ntawm lub ntiajteb txawj nqus (g) = 10 m/s ²

Xav tau: Qhov siab tshaj plaws (h)

Tshuaj:

Feem ntsug ntawm qhov ceev pib:

sin 30 ^o = v _oy / v _o

v _oy = v _o sin 30 ^o = (4)(sin 30 ^o ) = (4)(0.5) = 2 m/s

Xaiv qhov kev taw qhia mus rau sab saud ua qhov zoo thiab qhov kev taw qhia mus rau sab hauv ua qhov tsis zoo.

Paub:

Kev nrawm ntawm lub ntiajteb txawj nqus (g) = -10 m/s ² (tsis zoo downward)

Qhov feem ntsug ntawm qhov ceev pib (v _oy ) = +2 m/s (zoo rau sab saud)

Qhov ceev kawg ntawm qhov siab tshaj plaws (v _ty ) = 0

Xav tau: Qhov siab tshaj plaws

Tshuaj:

Qhov siab tshaj plaws:

vt2 = _vo2 + ^{2 gh}_​

0 ² = 2 ² + 2 (-10) teev

0 = 4 – 20 teev

4 = 20 teev

h = 4 / 20

h = 0.2 meters

Qhov siab tshaj plaws yog 0.2 meters + 20 meters = 20.2 meters.

[irp]

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1. Txheeb xyuas qhov ceev pib rau hauv cov khoom kab rov tav thiab ntsug
2. Txheeb xyuas qhov kev hloov pauv kab rov tav
3. Txheeb xyuas qhov siab tshaj plaws
4. Txheeb xyuas lub sijhawm sib nrug
5. Txheeb xyuas qhov chaw ntawm cov khoom
6. Txheeb xyuas qhov ceev kawg