A rocket of total mass M and with burnout mass 0.20M attains a speed of 3 400 m/s after starting from rest in deep space. What is the exhaust velocity of the rocket?
a. 6.8E+2 m/s
b. 2.1E+3 m/s
c. 1.7E+4 m/s
d. 2.2E+3 m/s
e. 1.1E+3 m/s
b
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Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)
Fill in the blank(s) with correct word
Force on a Wire: A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.
A. 0.75 N B. 1.5 N C. 3.0 N D. 6.0 N
One of the methods used to date supernova remnants (the remains of exploded stars) today is by using
A. the works of Ptolemy. B. the records of ancient Chinese, Japanese, and Korean astronomers. C. Kepler's laws. D. the notebooks of Galileo.
In Figure 5.14, the mass of block C is closest to:
A) 5 kg B) 7 kg C) 9 kg D) 11 kg E) 13 kg