Multiple-Choice Homework Problem 25.5 Outside the Institute of Art in Chicago th

Question

Multiple-Choice Homework Problem 25.5 Outside the Institute of Art in Chicago there is a sculpture called the “Cloud Gate” or more commonly the bean. It is a 12ft stainless steel bean with a mirrored surface. You can walk under the bean and if you look up you can see your reflection in the ceiling, a 10ft radius concave mirror. Note, you must determine the sign of the radius of curvature. It is about 4ft from your face to the vertex of the mirror. Where does your face appear to be, that is what is the image distance for your face? Report the image distance using the normal sign convention.

(a) +0.45ft (b) 6.7ft (c) 20ft (d) 100ft

Multiple-Choice Homework Problem 25.7 By squishing a solenoid, you generate an electro- magnetic pulse that has peak electric field E = 30N/C. When the wave hits a wall of area 200m2, the wave is completely absorbed. The electric field is uniform over the wall’s surface. What is the maximum force the pulse exerts on the wall?

(a) 8 × 107N (b) 2 × 106N (c) 3 × 108N (d) 5 × 108N

Multiple-Choice Homework Problem 25.8 A concave lens, lens 1, of focal length 50cm and a convex lens, lens 2, of focal length 5cm are separated by 50cm. An object is placed 100cm to the left of lens 1. Compute the magnification of the final image with the correct sign. Light travels through the system from left to right. Light travels from the object passing through lens 1 first and lens 2 second.

(a) 0.021 (b) 0.021 (c) 0.043 (d) 0.043

Explanation / Answer

Using the mirror formula

V = fu/f+u

Here F = R/2 = -10 /2 = 5 ft

V = -5*-4/-1 = -20 ft

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.