What type of material produces a voltage when deformed, and an applied voltage deforms the material?
(a) Dielectric
(b) Paraelectric
(c) Ferroelectric
(d) Piezoelectric
(d) Piezoelectric
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Starting from rest, a 2 kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is __________
Fill in the blank(s) with correct word
Photon Energy: A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 4.0 × 1018 B. 9.9 × 1019 C. 4.8 × 1019 D. 1.6 × 1017 E. 3.2 × 1017
A concave mirror has a focal length of 20 cm. What is the magnification if the object and image distances are 10 cm and ?20 cm, respectively?
A. 1 B. 2 C. 1/2 D. 1/4 E. ?1/2
What is the minimum work that a motor must do to lift a 70 lb object from the floor to a height of 14 feet?
a. 5 b. 70 c. 700 d. 980 e. 2010 ft-lbs