While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up.
b. 3.0 m/s, down.
c. 3.0 m/s, up.
d. 5.0 m/s, down.
e. 12.8 m/s, down.
[Ques. 2] A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street:
a. is less than that observed inside the bus.
b. is the same as that observed inside the bus.
c. is greater than that observed inside the bus.
d. may be either greater or smaller than that observed inside the bus.
e. may be either greater, smaller, or equal to that observed inside the bus.
[Ques. 3] The energy level diagram for hydrogen
The ionization energy of hydrogen is 13.6 eV.
a.
True
b.
False
[Ques. 4] Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
a. it is passing car A.
b. it has the same linear (tangential) acceleration as car A.
c. it has the same centripetal acceleration as car A.
d. it has the same total acceleration as car A.
e. it has traveled farther than car A since starting.
[Ques. 5] The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is 10.2 eV.
a.
True
b.
False
[Ques. 6] A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h
b. 95 km/h
c. 58 km/h
d. 32 km/h
e. 80 km/h
[Ques. 7] The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the
n = 3 state to the
n = 2 state is 1.9 eV.
a.
True
b.
False
[Ques. 8] The pilot of an aircraft flies due north relative to the ground in a wind blowing 40 km/h toward the east. If his speed relative to the ground is 80 km/h, what is the speed of his airplane relative to the air?
a. 89 km/h
b. 85 km/h
c. 81 km/h
d. 76 km/h
e. 72 km/h
[Ques. 9] A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes
b. 80 minutes
c. 90 minutes
d. 70 minutes
e. 60 minutes
[Ques. 10] Choose the lens having the shortest focal length.
a.
b.
c.
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