Extrasolar planets have been discovered with average densities similar to
A) styrofoam.
B) iron.
C) water.
D) all of the above
E) none of the above
D
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The ampere is defined
A) as a coulomb-second. B) as 4? × 10-5 SI units. C) as a coulomb/second2. D) as 4? × 10-7 SI units. E) using the force between current carrying wires.
The wavelength of a certain laser is 0.35 micrometers, where 1 micrometer = 1 × 10-6 m. Express this wavelength in nanometers
A) 3.5 × 102 nm B) 3.5 × 103 nm C) 3.5 × 101 nm D) 3.5 × 104 nm
A man standing on frictionless ice throws a 1.00-kg mass at 29.0 m/s at an angle of elevation of 50.0°. What was the magnitude of the man's momentum immediately after throwing the mass?
a. 45.1 kg·m/s b. 18.6 kg·m/s c. 22.2 kg·m/s d. 37.9 kg·m/s e. This cannot be answered because the mass of the man needs to be known.
The wavelengths of radiation from a star that is moving toward us
A) can be longer or shorter depending on the distance to the star B) are shorter than if the star were not moving C) are longer than if the star were not moving D) are the same as if the star were not moving