Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them. The 15.0-kg block accelerates when the string holding the system in compression is cut and the 30.0-kg box accelerates in the opposite direction. What is the magnitude of the force from the expanding spring on the 30.0-kg box when the 15.0-kg box is undergoing an acceleration of 5.00 m/s2?
a. 37.5 N
b. 150 N
c. 225 N
d. 75.0 N
e. 0 N
d
You might also like to view...
What is the effect of increasing the wavelength in an interference pattern?
a. There is no effect; to change the pattern, you have to change the frequency, not the wavelength. b. The nodal lines move closer to the central line. c. The pattern seen disappears. d. The image gets more blue-violet and less red. e. The interference pattern is wider for the longer wavelength.
What causes spherical aberration?
A. the lens surface is not perfectly smooth B. the outer edges of the lens produce a focus at a different point than the central rays C. light is an electromagnetic wave with intrinsic diffraction properties D. the absorption of light in the glass is a function of wavelength
If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about
A) ten and its weight by ten also. B) one hundred, and its weight by one thousand. C) one thousand, and its weight by one hundred thousand. D) none of the above
One similarity between electrons and photons is
A) both are the quanta of a field. B) both are particles of matter. C) Both of the above. D) both are forms of radiation. E) None of the above.