ĐỀ KIỂM TRA HỌC KỲ I ĐỀ Môn : Vật lý Lớp 11

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KIỂM TRA HỌC KỲ I. NK 2019 -2020

Môn : Vật lý.    Thời gian : 45 phút

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Lớp 11CL

 

ĐỀ CHÍNH THỨC

 

Câu 1: (4 đ) Một vật dao động điều hòa có phương trình dao động x = 2cos(4pt + π/3) (cm).

a) Viết phương trình vận tốc và gia tốc của vật.

b) Tìm tốc độ và vị trí của vật khi động năng bằng 3 lần thế năng.

c) Tính quãng đường mà vật đi được trong một 0,625 s đầu tiên.

d) Tính thời gian ngắn nhất để vật đi được quãng đường 14 cm.

Câu 2: (3 đ) Một con lắc lò xo thẳng đứng gồm vật nặng có khối lượng 100 g và một lò xo nhẹ có độ cứng k = 100 N/m. Kéo vật xuống dưới theo phương thẳng đứng đến vị trí lò xo dãn 3 cm rồi thả. Lấy g = π2 = 10 m/s2.

a) Viết phương trình dao động của con lắc.

b) Tính độ lớn lực đàn hồi cực đại và cực tiểu của lò xo.

c) Tính tỉ số thời gian lò xo dãn và thời gian lò xo nén trong một chu kì.

Câu 3: (3 đ) Một đồng hồ quả lắc có con lắc dài l = 1,44 (m). Đồng hồ chạy đúng khi ở gần mặt đất với gia tốc trọng trường g = π2 (m/s2)

a) Tính chu kỳ dao động của con lắc ở gần mặt đất.

b) Mang con lắc lên độ cao h = 10 km. Tính chu kỳ dao động của con lắc lúc này. Bán kính Trái Đất R = 6400 km.

c) Đồng hồ sẽ chạy nhanh hay chậm bao nhiêu trong một ngày đêm ở độ cao h = 10 km?

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