Projectile Motion: The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air resistance, how long does it take the football to reach the top of its trajectory?
A. 1.0 s
B. 2.0 s
C. 3.0 s
D. 4.0 s
E. 5.0 s
Answer: B
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A 4.0-kg block is lowered down a 37° incline a distance of 5.0 m from point A to point B. A horizontal force (F = 10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 10 J and at B it is 20 J. How much work is done on the block by the force of friction between A and B?
a.
?58 J
b.
?53 J
c.
?68 J
d.
?63 J
e.
?47 J
At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 mm B) 1.0 cm C) 2.0 cm D) 3.0 cm E) 4.0 cm
A child is standing at the rim of a rotating disk holding a rock. The disk rotates freely without friction. If the rock is dropped at the instant shown, which of the indicated paths most nearly represents the path of the rock as seen from above the disk?
The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature increases
a. True b. False Indicate whether the statement is true or false