1. A mass of10 kgis placed on top of a vertical string whose base is fixed to the ground. The spring compresses by 10 cm. How much is the spring constant? g = 10 m/s2

a. 100 N

b. 100 N/m

c. 1000 N/m

d. 10000 N/m

2. A block of mass5kgis attached to the end of a horizontal spring with spring stiffness constantk=500N/m. If it is stretched by 10 cm, what is the force of the spring?

a. 500 N

b. 50 N

c. 5000 N

d. 50000 N

3. A spring is pulled to 5 cm and held in place with a force of 500 N. What is the spring constant of the spring?

a. 1000 N

b. 10000 N

c. 1000 N/m

d. 10000 N/m

4. A mass of10 kgis placed on top of a vertical string whose base is fixed to the ground. The spring compresses by 10 cm. How much energy is stored in the spring?

a. 5 J

b. 50 J

c. 500 J

d. 0.5 J

5. A mass of10 kgis placed on top of a vertical string whose base is fixed to the ground. The relaxed length of the spring is 40 cm. The spring constant is 1000 N/m, what is the new lenght of the spring.

g = 10 m/s2

a. 50 cm

b. 30 cm

c. 60 cm

d. -30 cm

6. When an object is moving with uniform circular motion, the centripetal acceleration of the object.

a. is circular.

b. is perpendicular to the plane of motion.

c. is zero.

d. is directed toward the center of motion.

7. What is the term for the force directed toward the center of an object's circular path?

a. circular force.

b. centrifugal force

c. centripetal force

d. orbital force

8. A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the magnitude of the centripetal force?

a. 4.0 N

b. 43 N

c. 86 N

d. 3.7 kN

9. A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the magnitude of the bicycle's centripetal acceleration?

a. 1.0 m/s2

b. 2.0 m/s2

c. 4.0 m/s2

d. 8.0 m/s2

10. The centripetal force on an object in circular motion is

a. in the same direction as the tangential speed.

b. in the direction opposite the tangential speed.

c. in the same direction as the centripetal acceleration.

d. In the direction opposite the centripetal acceleration.