A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward direction. The projectile makes an angle of 30° with the direction of the plane's motion
What is the speed of the projectile with respect to a stationary observer on the ground? A) 293 m/s
B) 243 m/s
C) 268 m/s
D) 250 m/s
E) 281 m/s
B
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Doubling the focal length of the objective lens of a compound microscope will change the magnification by what factor?
a. 4 c. 2 b. 1/4 d. 1/2
A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
a. right at the water surface. b. 53.3 cm above the water surface. c. exactly 80.0 cm above the water surface. d. 107 cm above the water surface. e. an infinite distance above the water surface.
Simple Pendulum: A ball swinging at the end of a massless string, as shown in the figure, undergoes simple harmonic motion. At what point (or points) is the magnitude of the instantaneous acceleration of the ball the greatest?
A. C B. A and D C. A and C D. A and B E. B
Will our Sun become a supernova? Why?
What will be an ideal response?