The wavelength of the hydrogen line from level 1 to level 2 in a hot star is ____________ the wavelength of the same line in a cool star. The stars have the same radial velocities away from Earth
a. larger than
b. the same as
c. smaller than
d. not enough information to answer
b
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The possibility of life being transferred from another planet like Mars largely depends on whether that life can survive
A) being lasted from the parent planet B) inside the meteorite with very little water present C) long enough in space to make the journey to Earth D) the impact onto the Earth's surface
An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The net force on this auto is
A) 200 newtons backward. B) 1000 newtons forward. C) 800 newtons backward. D) 1200 newtons forward. E) 800 newtons forward.
A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than B. less than C. the same as
Which of the following is not a name used in the classification of galaxies?
a. Irregular b. Regular c. Spiral d. Elliptical