The force needed to make an object move in a circle is
a. centripetal force.
b. weight.
c. kinetic friction.
d. static friction.
e. none of the above.
a
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A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h
A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2 . What is the magnitude of the force of the elevator floor on the person?
a. 0.11 kN b. 0.81 kN c. 0.70 kN d. 0.59 kN e. 0.64 kN
The volcano Olympus Mons on Mars is
A) taller than Mt. Everest and as large as the state of Arizona B) smaller than Mt. Everest but as large as North America C) taller than Mt. Everest and but only as large as the Big Island of Hawaii D) about the same height and size as Mt. St. Helens in Washington State, USA
The atomic number (Z) of an element is equal to the number of ______________ in one of its atoms
a. protons b. neutrons c. protons plus neutrons d. neutrons plus electrons