Suppose a planet is discovered by the Doppler method and is then discovered to have transits. In that case, we can determine all the following about the planet except
A) its precise mass.
B) its density.
C) its physical size (radius).
D) its rotation period.
E) its orbital period.
D) its rotation period.
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A spaceship with a mass of 20,000 kg is traveling in a straight line at a constant speed of 300 km/s in deep space. Its rockets engines must be: (A) off or (B) firing?
A. off B. firing
Which of the following applications is not suitable for a titanium alloy?
(a) Human body implants (b) Parts in saltwater, such as a ship propeller (c) high strength low weight parts (d) a gas turbine part at 700°C (1292°F)
Answer the following statement(s) true (T) or false (F)
Suppose you observe a collision of an isolated system of two particles. A friend observes the same collision in a reference frame moving in the +x direction with respect to yours. According to the Galilean transformation equations, on which aspects of the collision will you agree with your friend? 1. On the value of the system’s total x-momentum 2. On the value of the system’s total y-momentum 3. On the value of the system’s total z-momentum 4. On the force W F that one particle exerts on the other 5. That the system’s total momentum is conserved
The center of mass (or center of gravity) of a two-particle system is at the origin. One particle is located at (3.0 m, 0.0 m) and has a mass of 2.0 kg. The other particle has a mass of 3.0 kg. What is the location of the 3.0-kg particle?
A) (-3.0 m, 0.0 m) B) (-2.0 m, 0.0 m) C) (2.0 m, 0.0 m) D) (3.0 m, 0.0 m)