The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm
The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain?
A) 480 B) 120 C) 184 D) 200 E) 360
D
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A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at the horizontal position. What is the angular acceleration of the rod at the instant the rod makes an angle of 70° with the horizontal?
A. 3.7 rad/s2 B. 1.3 rad/s2 C. 2.5 rad/s2 D. 4.9 rad/s2 E. 1.9 rad/s2
The Schwarzschild radius of a black hole is about 3 km per solar mass
Indicate whether the statement is true or false
A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?
a. 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. You drop the box. As it falls to its original level, its kinetic energy is
a. 0 c. 100 J b. 4 J d. none of the above