Compound Microscope: Which one of the following statements is correct?
A. The image formed by the objective of a microscope is smaller than the object.
B. The image formed by the objective lens of a telescope is larger than the object.
C. The image formed by the eyepiece is real for both a microscope and a telescope.
D. The image formed by the objective lens of a microscope is larger than the object.
Answer: D
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A black hole may be visible because electromagnetic radiation is emitted from a(n) ________ surrounding it, heated up enough to emit X-rays
Fill in the blank(s) with correct word
A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
A. 0.40 kg/s B. 0.50 kg/s C. 0.60 kg/s D. 0.70 kg/s E. 0.80 kg/s
Using a longer-handled wrench to loosen a tight nut allows you to
A. apply more torque to the nut. B. exert more force on the nut. C. increase the moment of inertia of the nut. D. pull harder on the wrench.
A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A) 53.1° S of E B) 53.1° E of S C) 36.9° E of S D) 36.9° S of E