A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?
A) 3.3 kg ? m/s
B) 4.8 kg ? m/s
C) 1.8 kg ? m/s
D) 1.5 kg ? m/s
E) 2.4 kg ? m/s
D
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Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be
A) along their directions of travel. B) perpendicular to their directions of travel. C) toward the Sun. D) none of the above
A cable is 100-m long and has a cross-sectional area of 1 mm2. A 1000-N force is applied to stretch the cable. The elastic modulus for the cable is 1.0 × 1011 N/m2. How far does it stretch?
A) 0.001 m B) 0.01 m C) 0.10 m D) 1.0 m E) 10 m
If we were to intercept a signal from a civilization that was sent to another of its colonies on the other side of the galaxy, this would be an example of
A) a signal used for communication between a civilization's home world and another star system B) a signal used for local communication the world where the intelligent beings exist C) a signal used for communication between a civilization's home world and another planet in its own planetary system D) an intentional signal beacon
An object is 50 cm in front of a plane mirror. Its image will be located
a. 50 cm in front of the mirror. b. at the mirror's surface. c. 50 cm behind the mirror. d. 25 cm in front of the mirror. e. 25 cm behind the mirror.