A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 445,000 N, what is the speed of the airplane 10.0 s later?
A) 10.0 m/s
B) 12.2 m/s
C) 14.0 m/s
D) 18.0 m/s
E) 20.0 m/s
B
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Circular Motion of Charges: A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will
A. move in a straight line. B. follow a spiral path. C. move along a parabolic path. D. follow a circular path.
A radio telescope 200 m in diameter is used to investigate sources emitting a 21-cm wavelength wave. What is the minimum angular separation of the sources that can be resolved by this system?
A) 0.073° B) 0.030° C) 0.0013° D) 0.154° E) 0.0026°
A chair is placed on a rug. Then a book is placed on the chair. The floor exerts a normal force
a. on all three. b. only on the book. c. only on the rug. d. upwards on the rug and downwards on the chair. e. only on the objects you have defined to be part of the system.
The force of static friction exerted on an automobile's tires by the ground
a. provides the accelerating force that makes the car move forward. b. does positive work on the car while it is accelerating. c. does negative work on the car while it is decelerating. d. does everything listed in (a), (b) and (c). e. only does positive or negative work as in (b) or (c).