میکانیات

A ball is thrown vertically upward at 20 m/s. What maximum height does it reach? (g = 10 m/s², no air resistance)

• 1 40 m
• 2 10 m
• 3 5 m
• 4 20 m

A ball is thrown vertically upward at 20 m/s. How long does it take to reach its highest point? (g = 10 m/s², no air resistance)

• 1 0.5 s
• 2 2 s
• 3 1 s
• 4 4 s

A 5 kg block slides down a frictionless incline of 30 degrees. What is its acceleration? (g = 10 m/s²)

• 1 10 m/s²
• 2 5 m/s²
• 3 8.7 m/s²
• 4 2.5 m/s²

A force of 10 N acts perpendicular to a spanner at a distance of 0.5 m from the nut. What torque is produced?

• 1 20 N m
• 2 10 N m
• 3 0.05 N m
• 4 5 N m

A skater spinning with arms outstretched pulls her arms in. Her angular velocity:

• 1 Becomes zero
• 2 Decreases
• 3 Stays the same
• 4 Increases

A 2 kg ball moving at 3 m/s collides head-on and elastically with a stationary 2 kg ball. What happens?

• 1 Both move at 1.5 m/s
• 2 The first ball stops and the second moves at 3 m/s
• 3 Both stop
• 4 The first ball rebounds at 3 m/s

How much energy is stored in a spring of constant 200 N/m stretched by 0.1 m?

• 1 20 J
• 2 0.1 J
• 3 10 J
• 4 1 J