As measured in Earth's rest frame, a spaceship traveling at 0.964c takes 11.2 y to travel between planets. How long does the trip take as measured by someone on the spaceship?
A) 2.98 y
B) 7.28 y
C) 42.1 y
D) 30.7 y
A
You might also like to view...
A tuning fork is sounded above a resonating tube (one end closed), which resonates at a length of 0.40 m and again at 1.2 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
a. 1.6 m b. 2.0 m c. 2.4 m d. 3.2 m e. 6.4 m
A bar of diameter d 5 18 mm and length L 5 0.75 m is loaded in tension by forces P. The bar has modulus E 5 45 GPa and allowable normal stress of 180 MPa. The elongation of the bar must not exceed 2.7 mm. The allowable value of forces P is approximately:
(A) 41 kN
(B) 46 kN
(C) 56 kN
(D) 63 kN
A stone thrown horizontally from a cliff with an initial speed of 10 m/s hits the bottom of the cliff in 4.3 s. What is the height of the cliff?
A. 22 m B. 43 m C. 69 m D. 91 m
A 755 N box rests on a floor with a coefficient of kinetic friction of 0.600 and a coefficient of static friction of 0.800. What horizontal force is required to start the box moving?
A. 755 N B. 453 N C. 254 N D. 653 N E. 604 N