On the surface of a sphere the shortest distance between two points is
A) an arc on a great circle.
B) a straight line.
C) a circle.
D) a triangle.
E) a curvy line.
A
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Most of the energy emitted by a pulsar _____
a. is carried away as a ‘pulsar wind' of high-speed atomic particles b. produces strong gravitational waves that radiate for several light years c. ionizes the supernova remnant around the pulsar d. is in the form of neutrinos e. is carried away by the high-energy beam emerging from the poles of the pulsar
An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,657 Hz B. 2,567 Hz C. 2,532 Hz D. 2,500 Hz E. 2,479 Hz
A Jurassic dinosaur is approaching your vehicle and appears in the side-view mirror. It is larger than it appears in the mirror. This means that
A. its image size is smaller than what the flat rearview mirror shows. B. it is inverted and real. C. its image size is larger than what the flat rearview mirror shows. D. it is a virtual image and inverted.
Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries
A. The gasoline has about 400 times as much energy. B. The gasoline has about 10 times as much energy. C. The gasoline has about 70 times less energy. D. They cannot be honestly compared, since one stores power and the other stores energy.