A building 30 m tall is being photographed with a camera with a lens of focal length 50 mm. How tall is the image on the film if the building is 100 m away?
A. 30 mm
B. 15 mm
C. 10 mm
D. 3.0 mm
E. 1.0 mm
B. 15 mm
You might also like to view...
Which of these seems the best present answer to the flatness problem?
A) The superforce rules creation. B) Dark Energy speeds the universe on out to infinity. C) Symmetry in creation of particles and antiparticles D) The inflationary epoch E) The GUT theory
What do we mean when we say that the Sun is in gravitational equilibrium?
A) The Sun always has the same amount of mass, creating the same gravitational force. B) The Sun maintains a steady temperature. C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. D) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity.
A rectangular loop (area = 0.15 m2) turns in a uniform magnetic field with B = 0.20 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?/2) rad and increasing at the rate of 0.60 rad/s, what is the magnitude of the emf induced in the loop?
a. 24 mV b. zero c. 18 mV d. 20 mV e. 6.0 mV
Discuss the solution to the flatness problem and horizon problem of the Universe
What will be an ideal response?