A student is sitting on the right side of a school bus when it makes a right turn. We know that the force of gravity acts downwards and a normal force from the seat acts upwards. If the student stays in place when the bus turns, we also know that there must be
a. no other force on the student.
b. a force parallel to the seat directed forward on the student.
c. a force parallel to the seat directed to the left on the student.
d. a force parallel to the seat directed to the right on the student.
e. a force parallel to the seat in a direction between forward and left on the student.
d
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Which of the following kinds of stars best obey the mass-luminosity relation?
a. main-sequence stars b. giant stars c. supergiant stars d. white dwarfs e. All of the other choices are correct.
Calculate the average force an outside object would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph)
A) 1.8 × 104 N B) 1.6 × 104 N C) 5.4 × 104 N D) 6.5 × 105 N E) 3.2 × 104 N
Based purely on its size, which of these planetary bodies is least geologically active?
a. Mercury b. Venus c. Earth d. Mars e. Io
The upper mantle can be divided into two portions, the
A) asthenosphere (lower zone of the upper mantle) and part of the lithosphere (the top zone of the upper mantle). B) asthenosphere (top zone of the upper mantle) and the lithosphere (the lower upper mantle). C) Moho and the lithosphere. D) continental mantle and the oceanic mantle.