A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, 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. 16 N
b. 17 N
c. 21 N
d. 11 N
e. 25 N
A
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A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s?1) of the system of ladder and woman is
A. 1.01. B. 3.07. C. 4.03. D. 8.05. E. 16.2.
On a warm 30.°C spring day, you are watching Richard take a buzzer and twirl it horizontally around on the end of a 2.0 meter long string. Why do you hear the buzzer tone Vary from 718. Hz to 772. Hz? What is the angular speed?
What will be an ideal response?
The energy that warms Earth's surface comes primarily in the form of __________.
a. ultraviolet light from the Sun b. visible light from the Sun c. heat from the Sun d. heat from Earth's interior e. infrared light from the Sun
Which of the following statements expresses what we mean by a scientific theory?
A) a simple model that explains a wide variety of phenomena and that has survived repeated tests B) an explanation for a physical phenomenon, an explanation that hasn't been tested yet C) an educated guess