Based on observations by the Dawn spacecraft, scientists have concluded that Vesta might be:
A) a planetesimal leftover from the solar system's formation.
B) the only remaining protoplanet in our solar system.
C) one of the dwarf planets in our solar system.
D) a fragment of Mars.
E) one of the remnants of the planet that broke up to form the asteroid belt.
B
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A crate of weight w is being pushed across a horizontal surface by a force directed at an angle of 20° below the horizontal. What is the magnitude of the normal force on the crate?
a. It is less than w. b. It equals w. c. It is more than w. d. None of the above since the coefficient of kinetic friction is not given.
Friction: The coefficients of static and kinetic friction between a 3.0-kg box and a horizontal desktop are 0.40 and 0.30, respectively. What is the force of friction on the box when a 15-N horizontal push is applied to the box?
A. 12 N B. 8.8 N C. 15 N D. 6.0 N E. 4.5 N
Which of the following can contribute to explaining why jovian moons are sometimes much more geologically active than terrestrial worlds of similar (or smaller) size?
a. ice-rich composition b. tidal heating c. orbiting far from the Sun d. orbiting far from their planet e. having a core of metal and rock
Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)
A) The electric field carries more energy than the magnetic field. B) The electric and magnetic fields have equal amplitudes. C) The electric field carries the same mount of energy as the magnetic field. D) The frequency of the magnetic field is the same as the frequency of the electric field. E) The frequency of the electric field is higher than the frequency of the magnetic field.