A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 x 104 Pa. What is the diameter of contact between the ball and the floor?
A) 2.8 cm
B) 1.4 cm
C) 1.7 cm
D) 2.1 cm
E) 5.6 cm
A
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What drives the motion of the continental plates on Earth?
A) lava flows in trenches along the sea floor B) tidal forces C) convection cells in the mantle D) Earth's magnetic field E) rotation of the liquid core
The only force acting on a 2.0-kg body moving along the x axis is given by Fx = (2.0x) N, where x is in m. If the velocity of the object at x = 0 is +3.0 m/s, how fast is it moving at x = 2.0 m?
a. 4.2 m/s b. 3.6 m/s c. 5.0 m/s d. 5.8 m/s e. 2.8 m/s
It takes 6400 years for one gram of radium to decay away to only 1/16—one-sixteenth—of a gram. The half-life of radium is
A) not possible to determine from this information. B) 1600 years. C) 400 years. D) 3200 years. E) 800 years.
In order, from top to bottom, in the activity series come Li, K, Ba, Na, Al, Zn, Sn, and Pb. Therefore,
a. tin is more active than lead. b. zinc is more active than aluminum. c. potassium is more active than lithium. d. sodium is more active than barium.