An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away
(One light-year is the distance light travels in one year.) According to the astronaut, how long does the trip take?
A) 15.0 y B) 14.4 y C) 22.7 y D) 4.20 y E) 9.34 y
D
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The following equation has been proposed for the heat transfer coefficient in natural convection from long vertical cylinders to air at atmospheric pressure:
Where Tf = the film temperature = 1/2 (Ts + T?) and Tf is in the range 0 to 200°C The corresponding equation in dimensionless form is
Compare the two equations, to determine those values of C, m and n in the second
equation that will give the same results as the first equation.
GIVEN
Empirical equations shown above
FIND
Values of C, m and n
ASSUMPTIONS
Air behaves as an ideal gas
Beats: Two taut strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other. Waves on the string with the lower tension propagate at 35.2 m/s. The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 11.0 Hz B. 9.00 Hz C. 13.7 Hz D. 12.6 Hz E. 17.1 Hz
How many protons does Tc have?
a. 93 b. 58 c. 48 d. 107 e. 43
An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ? = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?
a.
2.0 kg
b.
1.5 kg
c.
1.8 kg
d.
1.2 kg
e.
0.80 kg