As a wave passes from one medium into another, it often happens that its speed increases with no change in frequency. Under these circumstances, the wavelength
A. decreases.
B. increases.
C. stays the same.
Answer: B
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A 330-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 5.00 x 10-6 kg?m2 and a radius of 1.35 cm. A 255-g mass hangs from the other end of the string and is released
What is the acceleration of the cart? A) 9.72 m/s2 B) 7.14 m/s2 C) 6.53 m/s2 D) 4.74 m/s2 E) 4.08 m/s2
When a shower is turned on, the shower curtain moves towards the water spray. This partly involves
A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above
An object of mass 2 kg has a speed of 8 m/s and moves a distance of 6 m. What is its kinetic energy in joules?
a. 64 b. 48 c. 289 d. 16
Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is
A) about the same. B) much larger. C) much smaller. D) just slightly less.