A wire of diameter 1.0 mm and length 3.5 m stretches 3.5 mm when 8.0 kg is hung from it
(a) What is the Young's modulus for the wire?
(b) What is the effective spring constant for the stretching wire?
(a) 1.0 × 1011 N/m2
(b) 2.2 × 104 N/m
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A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance
What maximum elevation does the rocket reach? A) 327 m B) 487 m C) 160 m D) 408 m E) 320 m
A bicycle wheel has an outside diameter of 66 cm. Through what distance does a point on the rim move as the wheel rotates through an angle of 70°?
What will be an ideal response?
While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
A. 2.0 m/s, up. B. 2.8 m/s, down. C. 3.0 m/s, up. D. 5.0 m/s, up. E. 7.0 m/s, up.
You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?
A) kinetic to thermal B) thermal to chemical C) chemical to electromagnetic D) chemical to thermal E) elastic to thermal