Một vật có khối lượng m 3 kg  trượt từ đỉnh một mặt phẳng nghiêng ở độ cao 0,5m, chiều dài mặt phẳng nghiêng là 1m. Khi tới chân mặt nghiêng, vận tốc của vật là v 2,45 m/s  .

a. Tính công của lực ma sát khi vật trượt trên mặt nghiêng. Biết vận tốc ban đầu của vật bằng

không, lấy 

2 g 10 m/s .

b. Xác định hệ số ma sát giữa vật và mặt nghiêng.

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

Which of the following represents an upside-down image?

1134567 a jet with mass m = 1.1 ă— 105 kg jet accelerates down the runway for takeoff at 2 m/s2. 1) what is the net horizontal force on the airplane as it accelerates for takeoff? 2.2*10^5 n your submissions: 2.2*10^5 computed value: 220000submitted: saturday, january 26 at 2: 41 pm feedback: correct! 2) what is the net vertical force on the airplane as it accelerates for takeoff? 0 n your submissions: 0 computed value: 0submitted: saturday, january 26 at 2: 41 pm feedback: correct! 3) once off the ground, the plane climbs upward for 20 seconds. during this time, the vertical speed increases from zero to 21 m/s, while the horizontal speed increases from 80 m/s to 95 m/s. what is the net horizontal force on the airplane as it climbs upward? n 4) what is the net vertical force on the airplane as it climbs upward? n 5) after reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 13 seconds. what is the net horizontal force on the airplane as it levels off? n 6) what is the net vertical force on the airplane as it levels off?