An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)
A) If the lens is convex, the image will never be virtual.
B) If the image is real, then it is also inverted.
C) If the image is real, then it is also upright.
D) If the lens is concave, the image must be virtual.
E) If the lens is convex, the image must be real.
B, D
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A 2.0-kg block situated on a frictionless incline is connected to a light spring (k = 100 N/m), as shown. The block is released from rest when the spring is unstretched. The pulley is frictionless and has negligible mass. What is the speed of the block when it has moved 0.20 m down the plane?
A. 76 cm/s B. 68 cm/s C. 60 cm/s D. 82 cm/s E. 57 cm/s
A circular window 30 cm in diameter in a submarine can withstand a net maximum force of 5.20 × 105 N without damage
What is the maximum depth in a fresh-water lake to which the submarine can go without damaging the window? The density of fresh water is 1000 kg/m3. A) 680 m B) 740 m C) 1200 m D) 750 m
An object moves 10 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?
a. + b. ? c. 0 (no sign) d. any of the above
A 95-N force exerted at the end of a 0.32-m long torque wrench produces a torque of 15 N ? m. What is the angle (less than 90°) between the wrench handle and the direction of the applied force?
A) 30° B) 24° C) 36° D) 42°