Author Question: A certain star is 1000 light years from Earth. According to the theory of relativity, is it ... (Read 74 times)

lbcchick · **on:** Jul 29, 2018

A certain star is 1000 light years from Earth. According to the theory of relativity, is it physically possible for Mort to travel from Earth to this star during Mort's normal lifetime?

A) No, because Mort cannot travel faster than light.
B) No, because the relativity of time will cause Mort to age too rapidly.
C) No, because Mort's aging process is normal as measured in their own reference frame.
D) Yes, by traveling at nearly lightspeed.
E) Yes, by traveling much faster than lightspeed.

Question 2

A 1.5-kg cart attached to an ideal spring with a force constant (spring constant) of 20 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position.

(a) What is the frequency of the oscillations of the cart?
(b) Determine the maximum speed of the cart. Where does the maximum speed occur?
(c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur?
(d) How much total energy does this oscillating system contain?
(e) Express the displacement as a function of time using a cosine function.

yasmin · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

D

Answer to Question 2

(a) 0.58 Hz (b) 0.37 m/s, at the equilibrium position
(c) 1.3 m/s2, at maximum displacement (d) 0.10 J (e) x = (0.10 m) cos (3.7 s-1 t)