Which of the following type of electromagnetic radiation has the lowest energy?
A) radio
B) infrared
C) visible
D) ultraviolet
E) X-ray
A
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A 20.0-kg traffic light hangs midway on a cable between two poles 30.0 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 9.8E+1 N b. 9.8E+3 N c. 3.7E+3 N d. 3.8E+2 N e. 2.0E+4 N
A constant force is applied to a body that is already moving. The force is directed at an angle of 60 degrees to the direction of the body's velocity. What is most likely to happen is that
a. the body will stop moving. b. the body will move in the direction of the force. c. the body's velocity will increase in magnitude but not change direction. d. the body will gradually change direction more and more toward that of the force while speeding up. e. the body will first stop moving and then move in the direction of the force.
What produces the lunar phases?
a. The rotation of the Moon b. The revolution of the Moon c. The changing direction of sunlight d. Earth's tilted axis relative to the Moon e. The changing direction of Earth to the Moon
Because of developments of HTML5, which of the following is NOT used today to create web animations?
A. Flash B. CSS3 C. JavaScript D. animation software