Answer to Question #285482 in Physics for Kai

Question

1) A 96.9-J work is done on spring by stretching it a distance of 13.6cm. How much energy (in J) is stored in the spring?

Select one:

a. 96.90

b. 1317.84

c. 7.13

d. 83.30

 

2) A block of mass 8.7-kg sits on a frictionless table and is connected to a horizontal spring whose spring constant is 68.4-N/m. The block is moved to compress the spring by a distance of 5.1-cm before releasing the system from rest. Determine the maximum speed of the block.

 

3) A concrete block with a mass of 7.7-kg was accidentally dropped by a worker at a construction site from a scaffold which is 21-m above the ground. Calculate how much gravitational potential energy the block possesses after falling half the distance. Ignore the effects of air resistance.

Select one:

a. 1585 J

b. 792.330 J

c. 162 J

d. 80.85 J

Answer 1

1) A

2) The maximum speed is $v=A\sqrt{k/m}=14.3$ m/s.

3) A