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
Answer: B
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LR Circuits: The figure shows a circuit. The ideal battery has a constant terminal voltage of ? = 27 V, the inductance is L = 0.40 H, and the resistances are R1 = 12 ? and R2 = 9.0 ?. Initially the switch S is open with no currents flowing. Then the switch is suddenly closed.(a) What is the current in the resistor R1 the instant after the switch is closed?(b) After leaving the switch has been closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Fill in the blank(s) with the appropriate word(s).
What is the Cassini division of Saturn's rings?
A) a dark ring, visible from Earth, composed of dark, dusty particles B) a large gap, visible from Earth C) the imaginary circle marking the halfway point of Saturn's rings D) the widest ring of Saturn, located between two large ring gaps E) the most opaque ring of Saturn, made of highly reflective ice particles
An athlete throws a ball with a velocity of 40 m/s at an angle of 20° above the horizontal. Which of the following statements is true in this case?
A) The vertical component of the velocity remains constant. B) The horizontal component of the velocity changes. C) The vertical component of the velocity changes sign after the ball attains its maximum height. D) The horizontal component of the velocity changes sign after the ball attains its maximum height. E) None of the given choices is correct.
Sediments convert to rock when they undergo
A) compaction and cementation. B) lithification. C) both A and B.