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

Physics & Space Science

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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?

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The visible color of electromagnetic radiation that has the shortest wavelength is

A) red. B) orange. C) green. D) blue. E) violet.

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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

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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

Physics & Space Science