You want to swim straight across a river that is 76 m wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of 1.5 m/s relative to the water
At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is ? = 0° while directly across the river is ? = 90°). A) 1.3 m/s
B) 0.70 m/s
C) 1.6 m/s
D) 1.8 m/s
A
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An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
What is the observational difference between Types I & II supernovae?
A: Ia's come from white dwarfs in binaries whereas II's come from dying massive stars B: I's are brighter than II's C: I's are fainter than II's D: I's are Hydrogen poor while II's are Hydrogen rich E: I's have no central remnant while II's have neutron stars
The visible color of electromagnetic radiation that has the shortest wavelength is
A) red. B) orange. C) green. D) blue. E) violet.
A 1.0-g bead is at (-2.0 cm, 2.0 cm), a 2.0-g bead is at (2.0 cm, -4.0 cm), and a 3.0-g bead is at (2.0 cm, 0.0 cm). What are the coordinates of the center of mass of this system of beads?
What will be an ideal response?