A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where

image is the normal force,image is weight, and image is tension?
 
a.
image

b.
image
c.
image
 
d.
image
e.
image


c

Physics & Space Science

You might also like to view...

Using 0.0200 mol of an ideal monatomic gas, an isochoric process from A (230 kPa, 1.00 L) to B (98 kPa, 1.00 L) results in what change in internal energy?

A. -200 J B. +200 J C. -375 J D. +375 J

Physics & Space Science

The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to summer?

A) 1.2 cm B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm

Physics & Space Science

A proton moving at 6.0 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is acting down, how long does it take the proton to return to the horizontal plane? (Hint: Ignore gravity. mproton = 1.67 × 10^-27 kg, qproton = 1.6 × 10^-19 C)

a. 7.8 × 10^-6 s c. 7.8 × 10^-7 s b. 1.6 × 10^-6 s d. 3.9 × 10^-6 s

Physics & Space Science

A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?

a. 2.8 b. 1.7 c. 1.3 d. 4.0 e. 1.0

Physics & Space Science