Mars has two moons that are most similar in character to ________
A) particles in the rings of Saturn B) comets
C) small asteroids D) Earth's Moon
C
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The hydrogen and helium in our solar system were created from subatomic particles about ____________ years ago
a. 14 billion b. 10.5 billion c. 7.0 billion d. 4.5 billion
Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at
A) 30°. B) 60°. C) both hit at the same time
A helicopter is traveling at 50.0 m/s at a constant altitude of 150 m over a level field. If a wheel falls off the helicopter, with what speed will it hit the ground? (g = 9.8 m/s2 and air resistance negligible)
a. 63 m/s b. 55 m/s c. 74 m/s d. 54 m/s
When a car goes around a curve, it has a tendency to skid outwards. Is the frictional force between the tires and the ground that keeps the car from skidding kinetic or static?
A) kinetic B) static