A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum?
A) at either A or B
B) midway between A and B
C) one-third of the way between A and B
D) one-fourth of the way between A and B
E) none of the above
A
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Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.0 × 10^-6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 490 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 13 c. 9 b. 7 d. 17
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec2 acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 25.0 seconds from the start?
A. 107 rad B. 193 rad C. 205 rad D. 237 rad E. 274 rad
Dark matter does not affect galaxy collisions
Indicate whether the statement is true or false
All of the statements below are true. Which one gives the primary reason why the surface of Venus today is some 450°C hotter than the surface of Earth?
A) Venus is only about 73 percent as far from the Sun as Earth. B) Venus has a much stronger greenhouse effect than Earth. C) Venus has a much higher reflectivity than Earth. D) Venus has a higher atmospheric pressure than Earth.