A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning
The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much mechanical energy is converted to internal energy during this collision? A) 30 J
B) 16 J
C) 15 J
D) 13 J
E) 4.8 J
A
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Indicate whether the statement is true or false
The formation of which of the following is not directly caused by erosive wave action?
a. Wave-cut cliffs b. Sea stacks c. Pocket beaches d. Sea caves
Vector V1 is (5i + 7j - 3k) and vector V2 is (7i + 2 j + 14k). The component of V1 perpendicular to the line of action of vector V2 is:
(A) 4.80i + 6.94j – 3.39k (B) 4.80i - 6.94j – 3.39k (C) 4.80i - 6.94j + 3.39k (D) -4.80i + 6.94j – 3.39k
A planoconvex lens of radius R and index of refraction n is placed curved side down on flat glass surface. This configuration is being used to measure the wavelength of light produced by a particular light source. If the radius of the dark rings produced by interference is r, what is the wavelength of the light? Assume the setup is in air
1. rn/mR 2. Rn/mr 3. mR/nr2 4. R2/mR