Energy Conservation With Conservative Forces: A frictionless simple pendulum, with a small but dense 4.4-kg mass at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical.(a) To what height above its lowest point does the mass swing on the other side?(b) What is the speed of the mass at the bottom of the swing?
What will be an ideal response?
(a) 27 cm (b) 2.3 m/s
Physics & Space Science
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Physics & Space Science
Upon which point do Copernicus and Kepler disagree?
A) The Moon orbits the Earth. B) The Earth orbits the Sun. C) Retrograde motion occurs when one planet overtakes another. D) The orbits of the planets are ellipses, with one focus at the Sun. E) Venus will appear as a crescent when she retrogrades between us and the Sun.
Physics & Space Science
A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2 . How far does the car travel before it stops?
a. 39 m c. 55 m b. 31 m d. 63 m
Physics & Space Science
A large nuclear power plant delivers energy of about
A. 1 megawatt B. 1 gigawatt C. 100 gigawatts D. 1000 gigawatts
Physics & Space Science