A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed.
B) It is impossible to tell from the information given.
C) the ball
D) the stone
D
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A thermodynamic engine absorbs 85.6 kJ of energy each cycle and exhausts 61.8 kJ. (a) What is the efficiency of the engine? (b) How much work does it do each cycle?
What will be an ideal response?
Greenhouse gasses include
a. water vapor. b. CO2. c. CO. d. methane.
A length of wire has a resistance R. The wire is then uniformly stretched to double its original length. What resistance results. Hint: When the wire is stretched, its volume remains constant
1. R/2 2. R 3. 2R 4. more than 2R
The brightest stars of a young open cluster will be:
A) Cepheid variables. B) massive blue main sequence stars. C) red giants. D) yellow main sequence stars like the Sun. E) T Tauri variables.