An observer on a planet sees a spaceship approaching at 0.5c. A beam of light projected by the ship would be measured by this observer to travel at
A) 0.25c. B) 0.5c. C) c. D) 1.5c. E) 2.5c.
C
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A turbine blade rotates with angular velocity ?(t) = 2.00 rad/s- 2.1.00 rad/s3 t2. What is the angular acceleration of the blade at t = 9.10 s?
A) -38.2 rad/s2 B) -19.1 rad/s2 C) -86.0 rad/s2 D) -36.2 rad/s2 E) -172 rad/s2
An athlete participates in a discus throw competition during an Olympiad that takes place in a city where acceleration due to gravity is 9.80 m/s2. He throws the discus with an initial velocity of 20.0 m/s at an angle of 30.0° above the horizontal
Neglecting the height of the discus at the point of release, what is the range of the discus? A) 35.3 m B) 20.4 m C) 40.0 m D) 60.0 m E) 50.0 m
A certain metal has a resistivity of 1.68 × 10-8 ? ? m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 ??
A) 16 mm B) 16 cm C) 1.6 m D) 16 m
Ammonia is mixed with water in a ratio of 1 part ammonia to 4 parts water (by volume) and used as a cleaning agent for floors. Estimate the evaporation rate of the ammonia per unit area if the process occurs at 25ºC. Assume air is moving over the surface at 5 m/s.
What will be an ideal response?