Can you please help me with these college physics questions. The questions are down below. I really really really do not understand.

1. A 0.400-kg object is attached to a spring with spring constant k = 10.0 N/m and moves with simple harmonic motion over a horizontal frictionless surface. At the instant that it is displaced from equilibrium by ?0.0550 m, what is its acceleration? a. 2 200 m/s2 b. ?220 m/s2 c. 0.220 m/s2 d. 1.38 m/s2 e. 0.550 m/s2

2. A 0.30-kg object is oscillating on a spring with a spring constant of k = 22.0 N/m. What is the potential energy of the system when the object displacement is 0.035 m, exactly half the maximum amplitude? a. zero b. 0.027 J c. 0.013 J d. 0.39 J e. 11 J

3. A runaway railroad car, with mass 45.0 104 kg, coasts across a level track at 3.80 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 3.80 106 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.) a. 1.31 m b. 1.85 m c. 0.925 m d. 2.10 m e. 2.62 m

4. A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.3 cm for equilibrium it has a kinetic energy of 1.5 J and a spring potential energy of 2.3 J. What is the maximum speed of the mass during its oscillation? a. 4.4 m/s b. 0.16 m/s c. 6.2 m/s d. 4.8 m/s e. 3.0 m/s

5. A mass on a spring vibrates in simple harmonic motion at a frequency of 4.20 Hz and an amplitude of 7.50 cm. If the mass of the object is 0.260 kg, what is the spring constant? a. 6.86 N/m b. 696 N/m c. 181 N/m d. 24.1 N/m e. 339 N/m

6. A simple pendulum has a period of 4.40 s. What is the pendulum length? (g = 9.80 m/s2) a. 19.2 m b. 15.1 m c. 4.81 m d. 0.208 m e. 0.0520 m

Chapter 14: 7. The wavelength of a traveling wave can be calculated if one knows the: a. frequency. b. speed and amplitude. c. amplitude and frequency. d. frequency and speed.

8. A musical tone, sounded on a piano, has a frequency of 460 Hz and a wavelength in air of 0.50 m. What is the wave speed? a. 920 m/s b. 270 m/s c. 230 m/s d. 109 m/s e. 115 m/s

9. Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound waves in air is 335 m/s, what is the smallest size insect they can detect? a. 4.6 mm b. 3.6 mm c. 5.6 mm d. 6.6 mm e. 7.6 mm

10. A 2.00-m long piano string of mass 10.0 g is under a tension of 320 N. Find the speed with which a wave travels on this string. a. 506 m/s b. 253 m/s c. 126 m/s d. 358 m/s e. 80.0 m/s

11. The frequency separating audible waves and ultrasonic waves is considered to be 15.0 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 225 m/s.) a. 1.50 cm b. 33.8 cm c. 22.5 cm d. 33.8 cm e. 33.8 cm

12. Which of the following best describes a sound level of intensity 1 W/m2? a. extremely loud b. about that of a power mower c. normal conversation d. like a whisper

13. What is the intensity of sound from a band with a sound level of 129 dB? (I0 = 10?12 W/m2) a. 7.94 W/m2 b. 1.29 W/m2 c. 79.4 W/m2 d. 12.9 W/m2 e. 129 W/m2

14. You stand by the railroad tracks as a train passes by. You hear a 1 020-Hz frequency when the train approaches, which changes to 760 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s. a. 30.2 m/s b. 34.5 m/s c. 40.1 m/s

d. 49.7 m/s e. 45.6 m/s

15. A 550-Hz whistle is moved toward a listener at a speed of 25.0 m/s. At the same time, the listener moves at a speed of 35.0 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.) a. 510 Hz b. 533 Hz c. 655 Hz d. 460 Hz e. 594 Hz

16. A 1.30-m string is held fixed at both ends. When driven by a 140-Hz source, the string vibrates in 4 distinct segments. What is the natural fundamental frequency of the string? a. 35.0 Hz b. 70.0 Hz c. 215 Hz d. 431 Hz e. 45.5 Hz

17. The lower A on a piano has a frequency of 30.0 Hz. If the tension in the 2.00-m-long string is 316 N and one-half wavelength occupies the string, what is the mass of the string? a. 61.4 g b. 21.9 g c. 17.6 g d. 43.9 g e. 91.1 g

Chapter 15: 18. A 6.6-C charge is placed at the origin and a second charge is placed on the x-axis at x = 0.1 m. If the resulting force on the second charge is 5.7 N in the positive x-direction, what is the value of its charge? a. 1.0 C b. 1.0 nC c. -1.0 C d. -1.0 nC e. 0 C

19. Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm. What is the electric field midway between the two charges? (ke = 8.99 109 Nm2/C2) a. 7.1E+8 N/C b. 3.5E+8 N/C c. 1.8E+8 N/C d. zero e. 2.0E+8 N/C

Chapter 16: 20. Find the electrical potential at 0.25 m from a point charge of 7.0 C. (ke = 8.99 109N?m2/C2) a. 3.4 104 V b. 2.5 105 V c. 3.2 106 V d. 3.2 107 V e. 3.4 105 V

21. Two point charges of values +3.6 and +6.9 C are separated by 0.40 m. What is the electrical potential at the point midway between the two point charges? (ke = 8.99 109 N?m2/C2) a. +0.47 MV b. ?0.24 MV c. +0.24 MV d. +0.97 MV e. ?0.47 MV

#22 (in screenshot down below)

22. What is the equivalent capacitance of the combination shown? 20u F 30UF 20u F 30UF a. 24 uF b. 100 uF c. 12 uF d. 4.6 uFChapter 18: 26. Three resistors connected in parallel have individual values of 4.0, 6.0, and 10.0 0, respectively. If this combination is connected in series with a 12-V battery and a 2.0-2 resistor, what is the current in the 10.0-2 resistor? 2.00 12 V. 4.00