میکانیات اور کششِ ثقل

A car travelling at 72 km/h brakes with a constant deceleration of 5 m/s2. What distance does it cover before stopping?

• 1 20 m
• 2 40 m
• 3 72 m
• 4 80 m

A stone is launched at 20 m/s at 30 degrees above the horizontal. What is its time of flight? (g = 10 m/s2)

• 1 1 s
• 2 2 s
• 3 4 s
• 4 3.5 s

If the length of a simple pendulum is made four times as large, its period becomes:

• 1 Double
• 2 Half
• 3 Four times
• 4 Unchanged

What power is needed to lift a 100 kg load at a steady 2 m/s? (g = 10 m/s2)

• 1 200 W
• 2 2000 W
• 3 1000 W
• 4 20 W

What is the moment of inertia of a thin ring of mass M and radius R about its central axis?

• 1 MR^2 / 2
• 2 MR^2
• 3 2MR^2 / 5
• 4 MR^2 / 12

A satellite moves in a circular orbit. If its orbital radius becomes four times as large, its orbital speed becomes:

• 1 Half
• 2 Double
• 3 A quarter
• 4 Four times

A 0.5 kg ball hits a wall at 10 m/s and rebounds at 10 m/s along the same line. What is the magnitude of the impulse on the ball?

• 1 0
• 2 5 N s
• 3 10 N s
• 4 20 N s