Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water?
a. 7.50 m
b. 11.5 m
c. 15.0 m
d. 19.0 m
e. 30.0 m
b
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In outer space, you observe a straight stream of electrons flowing past you at 14.5 miles per second, about the same speed that Mars moves on its orbit around the sun.
You maneuver your spacecraft to face the current so that the electrons are moving from left to right and so that you are 10 m from the stream. In what direction does a compass needle point?
A. down 
B. up 
C. left 
D. right 
E. You observe no magnetic field
Radioactivity Basics: In beta-minus decay
A. a proton is emitted. B. a neutron is emitted. C. an electron is emitted. D. an electron decays into another particle. E. a proton is transformed into a neutron.
An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?
A) 1.0 cm B) 2.0 cm C) 8.0 cm D) 16 cm
Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A) 6.9 m/s B) 8.4 m/s C) 331 m/s D) 347 m/s