Latih tubi 7.2 & 7.3
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Soalan 1
Dalam aktiviti manakah
menunjukkan kerja
dilakukan? Tandakan (√)
pada ruang kosong
yang disediakan.
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Soalan 2
Rajah di bawah menunjukkan satu beban yang diangkat
oleh satu takal.
Soalan 3
Vershen menaikkan bendera Malaysia yang
berjisim 200 g setinggi h meter sempena
pelancaran bulan kemerdekaan. Jika tenaga
keupayaan graviti bendera ialah 8.1 Joule ,
tentukan ketinggian bendera itu dari
permukaan Bumi.
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Soalan 4
Seorang lelaki menjatuhkan sebiji bola keranjang
seberat 2 kg dari atas sebuah bangunan. Diberi
lelaki itu mempunyai ketinggian 1.52 meter dan
bangunan tersebut mempunyai ketinggian 10.64
meter.
Hitungkan tenaga keupayaan graviti yang dimiliki
oleh bola keranjang tersebut seandainya lelaki itu
menjatuhkannya dari
(i) Ketinggian A
Soalan 5
Sebuah spring yang panjangnya 20 cm telah
dimampatkan dengan pemberat 2 kg hingga
panjangnya berkurang kepada 12 cm. Apakah nilai
tenaga keupayaan kenyal spring itu?
Soalan 6
Satu spring menjadi 18 cm panjang apabila daya 50 N ?
digunakan untuk menarik spring itu. Tenaga keupayaan kenyal
yang tersimpan dalam spring ialah 2 J. Berapakah panjang asal
spring?
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Soalan 7
Hitung tenaga kinetik seekor kuda berjisim 400 kg yang
sedang berlari dengan
(a) Halaju 5 ms-1 (a) Halaju 10 ms-1
Soalan 8
Simon membaling bola berjisim 250 g
secara menegak ke atas dengan halaju
12 ms-1 . Hitungkan tenaga kinetik bola
tersebut.
Soalan 9
Sebuah kereta berjisim 800 kg
mengandungi 3 600 J tenaga kinetik.
Hitungkan halaju kereta tersebut.
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Latihtubi Bab 7 20.10
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