The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant.
B. its speed is increasing.
C. its speed is decreasing.
D. its speed is a maximum.
E. its speed is a minimum.
Answer: B
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A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s
(a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension force that the string exerts on the ball.
Since 1983 the standard meter has been defined in terms of which of the following?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by krypton-86 c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second e. None of the above
If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many golf balls would you need to equal the mass of 200 pingpong balls?
A) 10 B) 200 C) 100 D) 20 E) 6.022 × 1023
Sound waves in space
A) do not exist. B) travel so slowly that they are unnoticeable. C) travel much faster than sound on Earth but have such low density that they are inaudible. D) travel much faster than sound on Earth and are therefore very loud. E) can travel through the halo but not the disk of the galaxy.