If two objects of different masses are dropped
near the Earths surface from the same height at
the same instant and air resistance is neglected,
we will find that
a)the downward acceleration of the two objects
must be quite different.
b) both objects will experience the same
gravitational force.
c) both objects will strike the ground at the same time.
d) the weight of both objects will be the same.
[Ques. 2] A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
a. 24 cm/s2
b. 16 cm/s2
c. 18 cm/s2
d. 34 cm/s2
e. 44 cm/s2
[Ques. 3] A man is rotating on a frictionless platform at
a constant angular velocity when he
suddenly extends his arms away from his
sides. His speed of rotation will immediately
slow down because
a)his weight changes.
b)his angular momentum must be conserved.
c)am impulse has been applied.
d)his angular velocity increases.
[Ques. 4] A train is traveling due south at a constant
velocity of 86 mi/h. Any unbalanced force
acting on the train with respect to the Earths
surface must be
a)zero.
b)directed vertically upward.
c)directed toward the south.
d)directed vertically downward.
[Ques. 5] A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s
b. 42 cm/s
c. 45 cm/s
d. 35 cm/s
e. 53 cm/s
[Ques. 6] A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0 . The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
a. 0.25 m/s2
b. 0.50 m/s2
c. 0.14 m/s2
d. 0.34 m/s2
e. 0.20 m/s2
[Ques. 7] If the velocity of a bicycle rider decreases from 37.0 mi/h to 7.0 mi/h in 5.0 min, his average acceleration is
a) -6.0 mi/h/min
b) -8.3 mi/h/min
c) 1.7 mi/h/min
d) -6.7 mi/h/min
[Ques. 8] A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s
b. 4.0 s
c. 3.5 s
d. 3.0 s
e. 4.5 s
[Ques. 9] Sarah traveled by automobile from Ft.
Lauderdale to Naples, Florida, a distance of
120 miles, at an average speed of 60 mi/h.
The time required was
a) 5000 hours.
b) 2.0 hours.
c) 0.50 hours.
d) 2.5 hours.
[Ques. 10] Jane drove her car from Columbus, Ohio to
Cleveland, Ohio. She traveled a total
distance of 140 mi in 2.8 hours. Her average
speed was
a) 50 mi/h
b) 0.02 mi/h
c) 56 mi/h
d) 350 mi/h
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