What is the global positioning system (GPS)?
A) a system for determining positions on Earth using signals from a set of satellites in Earth orbit
B) a system for determining positions on the Earth by careful observations of the Sun and stars
C) a system of determining positions on the Earth by receiving radio signals from many ground-based beacons
D) a term used to refer to any type of celestial navigation
A) a system for determining positions on Earth using signals from a set of satellites in Earth orbit
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When two objects of unequal mass orbit each other, the center of mass is ____
a. at the center of the more massive object b. at the center of the least massive object c. half way between the centers of each object d. always closer to the less massive of the two objects e. always closer to the more massive of the two objects
The index of refraction of diamond is 2.42. This means that a given wavelength of light travels
A) 2.42 times faster in air than it does in diamond. B) 2.42 times faster in diamond than it does in vacuum. C) 2.42 times faster in vacuum than it does in diamond. D) 2.42 times faster in diamond than it does in air. E) 2.42 times faster in vacuum than it does in air.
An object floats with half its volume beneath the surface of the water. The weight of the displaced water is 2000 N. What is the weight of the object? The density of water is 1000 kg/m3
A) 1000 N B) 4000 N C) 2000 N D) It cannot be determined because we do not know the volume of the object.
A 25-kg television set rests on four rubber pads, each one having a height of 1.0 cm and a radius of 0.60 cm. A 200-N horizontal force is applied to the television set
How far does it move sideways due to the deformation of the rubber pads if the pads do not slide on the floor? The shear modulus of these rubber pads is 2.6 × 106 Pa. A) 6.8 mm B) 1.3 mm C) 3.4 mm D) 1.5 mm E) 1.7 mm