Newton's Second Law in 1 Dimension: Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph).
A. 1.8 × 104 N
B. 1.6 × 104 N
C. 5.4 × 104 N
D. 6.5 × 105 N
E. 3.2 × 104 N
Answer: B
You might also like to view...
Pluto is most like a
A) terrestrial planet. B) jovian (gas giant) planet. C) comet. D) star.
Energy in the Electric Field: A tiny particle carries a charge of 6.0 ?C. What is the energy density in the electric field at a distance of 4.0 m from this charge? (?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.050 mJ/m3 B. 0.20 mJ/m3 C. 0.81 mJ/m3 D. 3.2 mJ/m3
Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria. b. keeping the interior of the Earth hot. c. making smoke detectors work. d. finding flaws in jet engine parts. e. all of the above.
Which of the following does not result in high thermal conductivity?
(a) Strong bonding (b) Free electrons (c) Grain boundaries (d) Small interatomic distances