To a Ground-Based Observer, What Is the Speed of a Moving
To a ground-based observer, what is the speed of a moving ball tossed backward at 30 km/hour on a train moving forward at 90 km/hr?
A) 150 km/hr
B) 60 km/hr
C) 30 km/hr
D) 90 km/hr
E) 2700 km/hr
The legendary apple was to Isaac Newton as the _________ was to Albert Einstein.
B) speed of light
D) patent office
E) coin toss
Which of the following appears to be contradicted by the theory of relativity?
A) conservation of energy
B) the Lorentz factor
C) time dilation
D) length contraction
E) the Pythagorean theorem
In which direction does the length contraction phenomenon apply?
A) toward the center of the object
B) along the direction of motion
C) perpendicular to the direction of motion
D) in all directions simultaneously
E) in concentric circles