A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

A. 21 N
B. 11 N
C. 16 N
D. 26 N
E. 36 N


Answer: B

Physics & Space Science

You might also like to view...

If 4.0 J of work are performed in stretching an ideal spring with a spring constant of 2500 N/m, by what distance is the spring stretched?

A) 3.2 cm B) 3.2 m C) 0.3 cm D) 5.7 m E) 5.7 cm

Physics & Space Science

A uniform 135-g meter stick rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s

What is the magnitude of the angular momentum of the stick? A) 0.0394 kg ? m2/s B) 0.473 kg ? m2/s C) 0.0739 kg ? m2/s D) 0.158 kg ? m2/s E) 0.0236 kg ? m2/s

Physics & Space Science

When gas in a container expands to three times its volume at constant temperature, the gas pressure

A) is one third. B) is one ninth. C) triples. D) remains the same.

Physics & Space Science

The look-back time is

a. the time it takes for the light from an object to reach Earth. b. numerically equal to the distance in light-years. c. smaller for more distant objects. d. all of the above e. a and b above

Physics & Space Science