You toss a ball straight up in the air. At the highest point, the ball's
A. velocity is zero and the acceleration is downward.
B. velocity and acceleration are zero.
C. acceleration is zero but not its velocity.
D. velocity is zero and the acceleration is upward.
Answer: A
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A satellite that weighs 4900 N on the launchpad travels around the earth's equator in a circular orbit with a period of 1.667 h. The earth's mass is 5.97 × 1024 kg, its equatorial radius is 6.3 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
(a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the Earth's SURFACE. What will be an ideal response?
Differentiation is a process by which
A) denser materials like iron sank to the center of the Earth while less dense materials like rock rose to the surface B) the Earth's surface separated into continents and oceans C) convection mixed up the materials in the interior of the Earth D) less dense materials like rock sank to the center of the Earth while denser materials like iron rose to the surface
A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A) 0.678 m/s B) 0.106 m/s C) 1.36 m/s D) 1.14 m/s E) 2.72 m/s
Which statement about dark dust clouds is true?
A) They can be penetrated only with longer wavelengths such as radio and infrared. B) They block the vast majority of radio waves from our Galaxy. C) They comprise the majority of the mass of the Galaxy. D) They can be penetrated only with shorter waves, such as UV and X-ray. E) Hydrogen and helium are the chief absorbing and scattering agents.