A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?
What will be an ideal response?
2.2 m/s2 at 74° N of W
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Total Internal Reflection: A light ray enters a glass enclosed fish tank. From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water. The index for the glass is 1.50 and for water 1.33.(a) What is the angle of refraction in the glass?(b) What is the angle of refraction in the water?(c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so, find it.
What will be an ideal response?
Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/s2?
A) 86. lb B) 1.4 × 102 lb C) 1.2 × 102 lb D) 96. lb E) 1.56 × 102 lb
An airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. If her speed is 200 m/s at the time, find the radius of the loop
A metal sphere of radius 2.0 cm carries an excess charge of 3.0 ?C. What is the electric field 6.0 cm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 6.4 × 106 N/C B) 5.7 × 106 N/C C) 4.2 × 106 N/C D) 7.5 × 106 N/C E) 9.3 × 106 N/C