A mass of 0.20 kg, hung from a spring with a spring constant of 80.0 N

1.A mass of 0.20 kg, hung from a spring with a spring constant of 80.0 N/m, is set into an up-and-down simple harmonic motion. If the mass is displaced from equilibrium by 0.10 m and released from rest, what is its speed when moving through the equilibrium point?选项： A:0; B:1.4 m/s; C:2.0 m/s; D:3.4 m/s

2.1) A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.6 cm for equilibrium it has a kinetic energy of 1.4 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation (in m/s)? 选项： A、3.7 m/s B、4.7 m/s C、6.0 m/s D、6.3 m/s E、7.8 m/s

3.A 0.20-kg mass is oscillating on a spring over a horizontal
frictionless surface. When it is at a displacement of 2.6 cm for
equilibrium it has a kinetic energy of 1.4 J and a spring potential
energy of 2.2 J. What is the maximum speed of the mass during its
oscillation (in m/s)? 选项： A、3.7
m/s B、4.7
m/s C、6.0
m/s D、6.3
m/s E、7.8
m/s

4.A 0.20 kg object, attached to a spring with spring constant k = 10 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude of 0.080 m. What is its speed at the instant when its displacement is 0.040 m? (Hint: Use conservation of energy.)( )选项： A:9.8 m/s B:4.9 m/s C:49 cm/s D:24.5 cm/s E:53 cm/s

5.A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If the mass of the object is 0.20 kg, what is the spring constant?( ) 选项：A:40 N/m B:87 N/m C:126 N/m D:160 N/m E:190 N/m

6.A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If the mass of the object is 0.20 kg, what is the spring constant?( )选项： A:40 N/m B:87 N/m C:126 N/m D:160 N/m E:190 N/m

7.

1) A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.6 cm for equilibrium it has a kinetic energy of 1.4 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation (in m/s)?

8.A 0.20-kg mass is oscillating on a spring over a horizontalfrictionless surface. When it is at a displacement of 2.6 cm forequilibrium it has a kinetic energy of 1.4 J and a spring potentialenergy of 2.2 J. What is the maximum speed of the mass during itsoscillation (in m/s)? A: 3.7m/s B: 4.7m/s C: 6.0m/s D: 6.3m/s E: 7.8m/s

9.A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If a timer is started when its displacement is a maximum (hence x = 8 cm when t = 0), what is the displacement of the mass when t = 3.7 s? ( )选项： A:zero B:0.025 m C:0.036 m D:0.080 m E:0.095 m

10.A 1.0 kg block is attached to a spring with spring constant 16 N/m and is at rest on a smooth horizontal plane. It is hit with a hammer and acquires instantaneously a speed of 0.40 m/s. The speed of the block at x = A/2 is ___________ m/s (round to two decimal places ).

11.A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0Hz and an amplitude of 8.0cm.
If a timer is started when its displacement is a maximum (hence x=8cm
when t=0),
what is the
displacement of the mass when t=3.7s? 选项： A、zero B、0.025
m C、0.036
m D、0.080
m E、0.095
m

12.A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. If the block had been originally at rest and is free to move, what is its resulting speed?选项： A:9 m/s; B:18 m/s; C:90 m/s; D:900 m/s; E:60 m/s; F:600 m/s

13.The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (πt/16). What is its position at t = 5.0 s? ( )选项： A:0.159 m B:0.076 m C:0.160 m D:0.089 m E:0.113 m

14.An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 4.0 ×10^6 m. What free fall acceleration will the 0.50-kg object experience when transported to a distance of 2.0 × 10^6 m from the surface of this planet?选项： A:90 m/s^2; B:20 m/s^2; C:13 m/s^2; D:18 m/s^2; E:28 m/s^2; F:38 m/s^2

15.A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum speed can the mass have if the string is not to break?选项： A:370 m/s; B:22 m/s; C:19 m/s; D:29 m/s; E:25.9 m/s; F:2.87 m/s; G:95 m/s

16.You were at rest and a police car with its siren on was passing you with a constant speed. You found that the frequencies of the siren were respectively 550 Hz and 450 Hz when the police car was moving toward and away from you. Assume that the speed of sound in air is 340 m/s. The speed of the police car was m/s.

17.The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm?( ) 选项： A、3.93 m/s B、15.7 m/s C、7.85 m/s D、31.4 m/s E、1.66 m/s

18.Suppose a 0.3-kg mass on a spring that has been compressed 0.10 m has elastic potential energy of 1.0 J. How much further must the spring be compressed to triple the elastic potential energy? ( )选项： A:0.07 m B:0.20 m C:0.30 m D:0.17 m E:0.05 m