The distance of the Earth from the Sun is 93 000 000 miles. If there are 3.15 107 s in one year, find the speed of the Earth in its orbit about the Sun.
a. 9.28 miles/s
b. 18.6 miles/s
c. 27.9 miles/s
d. 37.2 miles/s
[Ques. 2] A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m. What is the average velocity?
a. 79.3 m/s
b. 78.8 m/s
c. 83.8 m/s
d. 75.8 m/s
e. 81.5 m/s
[Ques. 3] Jeff throws a ball straight up. For which situation is the vertical velocity zero?
a. on the way up
b. at the top
c. on the way back down
d. none of the above
[Ques. 4] A cheetah can maintain its maximum speed of 96.0 km/hr for 26.0 seconds. What minimum distance must a gazelle running 85.0 km/hr be ahead of the cheetah to escape?
a. 96 m
b. 79 m
c. 40 m
d. 73 m
e. 67 m
[Ques. 5] A cheetah can run at approximately 100 km/h and a gazelle at 80.0 km/h. If both animals are running at full speed, with the gazelle 50.0 m ahead, how long before the cheetah catches its prey?
a. 9.0 s
b. 14 s
c. 18 s
d. 4.5 s
e. 21 s
[Ques. 6] A bird, accelerating from rest at a constant rate, experiences a displacement of 22 m in 10 s. What is the average velocity?
a. 1.2 m/s
b. 2.2 m/s
c. 2.4 m/s
d. 0 m/s
e. 0.5 m/s
[Ques. 7] An object moves 10.0 m east in 10.0 s and then returns to its starting point taking an additional 40.0 s. If west is chosen as the positive direction, what is the average speed of the object?
a. 0.4 m/s
b. 0.4 m/s
c. 10.0 m/s
d. 0 m/s
e. 10.0
[Ques. 8] An object moves 10 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?
a. +
b.
c. 0 (no sign)
d. any of the above
[Ques. 9] In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?
a. It is positive.
b. It is negative.
c. It is zero.
d. It can be positive, negative, or zero.
[Ques. 10] In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?
a. It is positive.
b. It is negative.
c. It is zero.
d. It can be positive, negative, or zero.
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