Car 1 with mass m rounds an unbanked curve of radius R traveling at a constant speed . Car 2 with mass 2m rounds a curve of radius 2R traveling at a constant speed 2 . How does the magnitude of the sideward static friction force acting on car 2 compare with the magnitude

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A.

B.

C.

D.

E.

F. Other (specify)

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E.

Physics & Space Science

A boat moves at 11.0 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1000 m upstream followed by a 1000 m trip downstream?

a. 188 s c. 208 s b. 205 s d. 222 s

Three identical point charges (+2.0 nC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. If the electric potential is taken to be zero at infinity, what is the potential at the midpoint of any one of the sides of the triangle?

a. 16 V b. 10 V c. 70 V d. 46 V e. 44 V

Photoelectric Effect: When it is struck by 240-nm photons, a material having a work function of 2.60 eV emits electrons. What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)

A. 2.58 eV B. 5.18 eV C. 2.00 eV D. 4.21 eV

What force drives the planets along their orbits?

a. magnetism b. no force is needed to drive them along their orbits c. gravity d. solar wind