38. An object is hung from a vertical spring, extending it by 24 cm. If the spring constant is 35 N/m, what is the potential energy of the stretched spring? 39. An unruly student pulls an elastic band that has a spring constant of 48 N/m, producing a 2.2 J increase in its potential energy. How far did the student stretch the elastic band? 40. A force of 18 N compresses a spring by 15 cm. By how much does the spring's potential energy change?
38. An object is hung from a vertical spring, extending it by 24 cm. If the spring constant is 35 N/m, what is the potential energy of the stretched spring? 39. An unruly student pulls an elastic band that has a spring constant of 48 N/m, producing a 2.2 J increase in its potential energy. How far did the student stretch the elastic band? 40. A force of 18 N compresses a spring by 15 cm. By how much does the spring's potential energy change?
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Please answer questions 26 and 39
Transcribed Image Text:continued from previous page
25. A child's toy race car travels across the floor
with a constant velocity of 2.10 m/s. If the
find
car possesses 14.0 J of kinetic energy,
the mass of the car.
26. A 1250 kg car is travelling 25 km/h when the
driver puts on the brakes. The car comes to a
stop after going another 10 m. What was the
average frictional force that caused the car
to stop? If the same car was travelling at
go
before
50 km/h when the driver put on the brakes
and the car experienced the same average
stopping force, how far would it
coming to a complete stop? Repeat the
calculation for 100 km/h. Make a graph of
stopping distance versus speed. Write a
statement that describes the relationship
between speed and stopping distance.
Transcribed Image Text:38. An object is hung from a vertical spring,
extending it by 24 cm. If the spring constant
is 35 N/m, what is the potential energy of the
stretched spring?
39. An unruly student pulls an elastic band that
has a spring constant of 48 N/m, producing a
2.2 J increase in its potential energy. How far
did the student stretch the elastic band?
40. A force of 18 N compresses a spring by
15 cm. By how much does the spring's
potential energy change?
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