Explain how the eccentricity describes the shape of an ellipse
What will be an ideal response?
The higher the eccentricity, the more elongated the oval; a circle has an eccentricity of zero, while very stretched out comet orbits approach an eccentricity of one.
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Work-Energy Theorem: A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force. What is the cart's final kinetic energy?
A. 200 J B. 160 J C. 120 J D. zero
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 10^4 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca. b. measured by one clock fixed at one spot on the spaceship. c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
In the first law of thermodynamics
the variables Q and W stand for
A. the heat flow out of the system and the work done on the system. B. the heat flow out of the system and the work done by the system. C. the heat flow into the system and the work done by the system. D. the heat flow into the system and the work done on the system.
A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image
Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture? A) 1.6 mrad B) 2.2 mrad C) 3.2 mrad D) 4.5 mrad E) 6.3 mrad