1. In the following figure, a ball is thrown with an initial velocity vo -10m/s

Question

1. In the following figure, a ball is thrown with an initial velocity vo -10m/s at an angle of 30° above the horizontal. The horizontal component of the velocity is: a) 5m/s b) 8.7m/s c) 10m/s d) zero. 2. In a circular motion, the radial acceleration is always a) directed towards the center of the circle. b) directed away from the center of the circle. c) zero. d) in the same direction as the velocity of the object moving along the circle. 3. An object weighs 980 N on Earth. The mass of the object is: [Take g -9.8m/s A) 10kg B) 100kg C) 1000g D) 980kg 4. The object in the following figure is not moving. The weight of the object is 100N. I the coefficient of static friction is 0.3, the magnitude of the static frictional force is: normal F- 5N a) 5N b) 30N c) 100N d) all above answers are incorrect.

Explanation / Answer

1.

The Horizontal componenr of velocity is

Vox=10Cos30=8.66 m/s

2.

Directly towards the center of the circle

3.

mass

m=W/g =980/9.8

m=100 kg

4.

The magnitude of static frictional force is

F-fs=0

fs=F=5 N

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