Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and 5.0 cm. The respective diameters are 60. mm and 10. mm
How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?
8 degrees wide (16 times larger)
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A basketball bounces off the floor. It is difficult to apply conservation of momentum usefully to the ball–earth system in this case because
A. The system is not isolated. B. A basketball does not bounce perfectly elastically. C. Air friction is significant. D. We can’t easily measure the earth’s velocity. E. The law doesn’t apply to contact interactions.
A 3.0 kg mass is connected to a spring with a spring constant of 6.0 N/m. The velocity is given by the expression v(t) = 10.0 cm/s sin
What is the maximum velocity of the simple harmonic motion?
A. 10 cm/s B. 14 cm/s C. 17 cm/s D. 20 cm/s E. 25 cm/s
Long canyons on the lunar surface are called ________.
A. rilles B. rifts C. maria D. rays
A projectile is fired from ground level at an angle of 40.0° above horizontal at a speed of 30.0 m/s. What is the speed of the projectile when it has reached a height equal to 50.0% of its maximum height?
A) 26.7 m/s B) 26.0 m/s C) 28.7 m/s D) 27.4 m/s E) 28.1 m/s