A point on the rim of a 0.25-m-radius rotating wheel has a centripetal acceleration of 4.0 m/s2 . What is the angular speed of the wheel?
a. 1.0 rad/s
b. 2.0 rad/s
c. 3.2 rad/s
d. 4.0 rad/s
d
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According to the solar nebula theory, dust grains, whatever their composition, grew from microscopic size first by condensation, then by accretion
Indicate whether the statement is true or false
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed
(a) Determine the distance between two adjacent nodes. (b) Determine the wavelength of the waves that travel on the string. (c) Determine the speed of traveling waves on this string. (d) Determine the fundamental frequency of this string.
Why might sodium carbonate (washing soda, Na2CO3) be added to hard water to aid in cleaning?
A) The hard ions in the water are more attracted to the carbonate ions -2 charge. B) The hard ions are dissolved by the added sodium ions. C) The soap gets softer due to the added ions. D) The ions solubilize the soap due to ion-ion intermolecular attraction, which improves the cleaning ability. E) none of the above
Projectile Motion: A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will
A. be behind the package. B. be directly over the package. C. be in front of the package. D. depend on the speed of the plane when the package was released.