An empty train car of mass 2.0 x 104 kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in
What will be an ideal response?
8.7 m/s
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A beam of plane polarized light is incident on 3 polarizers, the first with an axis at 30° to the original plane of polarization, the second at 60° to the original plane of polarization, and the third at 30° to the original plane of polarization. What angle does the plane of polarization of the transmitted light make with the original plane of polarization of the original beam?
a. 30° c. 90° b. 180° d. The answer is not given.
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25-m-long current is
A. 0. B. 0.012 N, East. C. 0.012 N, West. D. 0.30 N, West. E. 300 N, East.
What does the prefix pico- stand for?
What will be an ideal response?
A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.6 m/s when at the release point, to what maximum angle will it move in the second half of its swing?
a. 86.3° b. 32.8° c. 39.1° d. 83° e. 180°