For a system in mechanical equilibrium, the resultant
A) force must be zero.
B) torque must be zero.
C) both of these
D) none of these
Answer: C
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Conversion of Units: Given that 1.00 in. = 2.54 cm, how many square centimeters are in 1.00 square inch?
A. 1.59 B. 2.54 C. 5.08 D. 6.45
Impulse: A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of 16 m/s. If the clay comes to a stop in 91 m/s, what is the average horizontal force on the clay due to the wall?
A. 42 N B. 26 N C. 35 N D. 51 N
Lens-Maker Formula: A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens.(a) What is the focal length of this lens?(b) What is the index of refraction of the material from which the lens is made?
Fill in the blank(s) with the appropriate word(s).
Determine which of the following objects obey the equations of projectile motion developed in this chapter
i. A ball is thrown in an arbitrary direction. ii. A jet airplane crosses the sky with its engines thrusting the plane forward. iii. A rocket leaves the launch pad. iv. A rocket moving through the sky after its engines have failed. v. A stone is thrown underwater.
1.(i) and (v) only 2.(ii), (iii) and (iv) only 3.(i) and (iv) only 4.All of them obey the equations of projectile motion.