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Chapter 5: Q. 50 (page 130)
Your friend went for a loop-the-loop ride at the amusement
park. Her car is upside down at the top of the loop.
abcd
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Figure shows an object’s acceleration-versus-force graph. What is the object’s mass?
A constant force is applied to an object, causing the object to accelerate at 8.0 m/s2. What will the acceleration be if
a. The force is doubled?
b. The object’s mass is doubled?
c. The force and the object’s mass are both doubled?
d. The force is doubled and the object’s mass is halved?
Exercises 27 describe a situation. Identify all forces acting on the object and draw a free-body diagram of the object.
A jet plane is accelerating down the runway during takeoff.
Friction is negligible, but air resistance is not.
If an object is at rest, can you conclude that there are no forces acting on it? Explain.
A brick is falling from the roof of a three-story building. How many force vectors would be shown on a free-body diagram? Name them.
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