A 0.80-kg object tied to the end of a 2.0-m string swings as a pendulum. At the lowest point of its swing, the object has a kinetic energy of 10 J. Determine the speed of the object at the instant when the string makes an angle of 50° with the vertical
a. 5.6 m/s
b. 4.4 m/s
c. 3.3 m/s
d. 5.0 m/s
e. 6.1 m/s
c
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The velocity of an airplane with respect to the ground is 
m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the airplane with respect to the air is 
m/s at an angle of 60.0 degrees NORTH of EAST. What is the velocity of the air with respect to the ground?
A. 112 m/s at 50.0 degrees NORTH of EAST B. 102 m/s at 17 degrees SOUTH of EAST C. 134 m/s at 49 degrees SOUTH of EAST D. 134 m/s at 17 degrees NORTH of EAST E. 102 m/s at 65 degrees NORTH of EAST
Vector V1 is (5i + 7j - 3k), vector V2 is (7i + 2j + 14k), and vector V3 is (i - 2j + 5k). The scalar triple productV1*( V2 x V3) is:
(A) -91 (B) 82 (C) 56 (D) 91
Spherical Mirrors: A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror. If the image of the flower is 4.0 cm tall, how far is the image from the mirror?
A. 11 cm B. 9.4 cm C. 1.4 cm D. 0.090 cm
During this century, we have found that Newton's physics does not apply to
A) high speed objects. B) very strong gravitational forces. C) very small objects. D) All of the above. E) Nonsense--Newton's physics always applies.