The 500 m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500 m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would
then be measured to be
a. 180 m.
b. 320 m.
c. 500 m.
d. 625 m.
e. 781 m.
d
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The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 6.0 m?
A. 14 J
B. 12 J
C. 10 J
D. 8.0 J
E. 6.0 J
An atom that has lost an electron is called an ion
Indicate whether the statement is true or false
Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. ?E?t ? h/4?. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is
me/100 . (me = 9.11 × 10^?31 kg.) How long will this particle exist? a. 6.4 × 10^?20 s b. 2.3 × 10^?23 s c. 1.0 × 10^15 s d. 1.2 × 10^13 s e. 8.1 × 10^?19 s
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The acceleration of the ball in m/s2 is
a. 0 d. 6 b. 4.9 e. none of these c. 9.8