If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude.
B) your latitude and the direction that is due north for you.
C) your longitude and the direction that is due north for you.
D) your latitude and the local time.
E) your latitude, longitude, and local time.
B) your latitude and the direction that is due north for you.
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A force field is induced in any region of space in which
A) an electric field changes with time. B) a magnetic field changes with time. C) both of these D) neither of these
A 50.0-kg person stands on a 200-kg raft, which is at rest. She starts to walk on the raft with a speed of 3.00 m/s with respect to the raft. What is the speed of the person relative to the water?
A) 2.40 m/s B) 0.225 m/s C) 0.500 m/s D) 0.750 m/s E) 1.20 m/s
A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.0 m height. What is the distance along the horizontal axis when the projectile hits the roof?
A. 25.8 m B. 22.3 m C. 19.4 m D. 17.5 m E. 15.0 m
A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate
What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released? A) 0.068 N ? m B) 0.61 N ? m C) 0.079 N ? m D) 0.063 N ? m E) 0.00070 N ? m