An astronaut in an inertial reference frame measures a time interval ?t between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats?
A) ?t
B) more than ?t
C) less than ?t
D) The answer depends on whether they are moving toward her or away from her.
Answer: B
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If you feel a centrifugal force pulling you to the outside of a rotating circular wall:
a. you are correct about what is happening. b. the circular wall actually is pushing on you. c. you are experiencing a linear force. d. the centripetal force inward balances the centrifugal force outward, and you feel no net force. e. you are only experiencing half of what is happening; you are being pulled to the outside of the circle and the outside of the circle is also pushing on you.
A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10-19 C)
A) 0 N B) 1.6 × 10-16 N upwards C) 1.6 × 10-16 N downwards D) 1.1 × 10-16 N eastwards E) 4.4 × 10-16 N westwards
Only neutrinos can go faster than the speed of light
Indicate whether the statement is true or false
Kinetic Energy: The special theory of relativity predicts that there is an upper limit to the speed of an object. It therefore follows that there is also an upper limit on which of the following properties of the object? (There could be more than one correct choice.)
A. The kinetic energy of the object. B. The total energy of the object. C. The linear momentum of the object. D. None of these.