A rocket has an exhaust speed of 2.5 × 10^3 m/s, and produces 7.5 × 10^5 N of instantaneous thrust. What mass of fuel does the rocket burn each second?
a. 3.30 × 10^–3 kg/s
b. 17.1 kg/s
c. 300 kg/s
d. 1.90 × 10^9 kg/s
c
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A uniform rod is hinged to a wall and held at a 30° angle by a thin string that is attached to the ceiling and makes a 90° angle to rod. Which statement(s) must be true? (At least one of them is true and at least one is false.)
1.The hinge force is purely vertical.
2.The hinge force is purely horizontal.
3.The string tension is equal to the hinge force.
4.The string tension is smaller than the rod's weight.
5.1 and 3 are true.
6.2 and 3 are true.
7.1 and 4 are true.
8.2 and 4 are true.
9.3 and 4 are true.
10.Three of the statements are true.
The largest of the red stars are the ____________________ stars
Fill in the blank(s) with correct word
The spectra of Type II supernova contain no hydrogen lines
a. True b. False Indicate whether the statement is true or false
Which of the following has the longest wavelength, assuming that they all have the same speed?
A) electron B) helium atom C) baseball D) water molecule E) None of these objects have wavelengths of any kind.