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Chapter 8: Q.14 (page 199)
A satellite orbiting the moon very near the surface has a period of min. What is free-fall acceleration on the surface of the moon?
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A asteroid is heading directly toward the center of the earth at a steady . To save the planet, astronauts strap a giant rocket to the asteroid perpendicular to its direction of travel. The rocket generates of thrust. The rocket is fired when the asteroid is away from earth. You can ignore the earth鈥檚 gravitational force on the asteroid and their rotation about the sun.
a. If the mission fails, how many hours is it until the asteroid impacts the earth?
b. The radius of the earth is . By what minimum angle must the asteroid be deflected to just miss the earth?
c. What is the actual angle of deflection if the rocket fires at full thrust for before running out of fuel?
A car drives around a flat -diameter circular track at . What are the magnitude and direction of the net force on the car? What causes this force?
Aball moves in a vertical circle on a cm-long string. If the speed at the top is , then the speed at the bottom will be .
a. What is the gravitational force acting on the ball?
b. What is the tension in the string when the ball is at the top? c. What is the tension in the string when the ball is at the bottom?
A toy train rolls around a horizontal -m-diameter track. The coefficient of rolling friction is . How long does it take the train to stop if it鈥檚 released with an angular speed of rpm?
What is free-fall acceleration toward the sun at the distance of the earth鈥檚 orbit? Astronomical data are inside the back cover of the book .
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