A mass is accelerated when ______________ acts upon the mass

a. a balanced force
b. any force
c. no force
d. an unbalanced force
e. none of these


d

Physics & Space Science

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Suppose that there are 10 billion (10,000,000,000,000 ) habitable planets in our galaxy, that 1 in 5 habitable planets has life, that 1 in 1000 planets with life has at some point had an intelligent civilization, and that 1 in 1000 civilizations that

have ever existed is in existence now. How many civilizations would exist at present? A) 200,000 B) 2,000,000 C) 20,000 D) 20,000,000

Physics & Space Science

A photon scatters off of a stationary electron. Which of the following statements about the photon are true? (There could be more than one correct choice.)

A) Its wavelength increases due to the scattering. B) Its frequency increases due to the scattering. C) Its wavelength decreases due to the scattering. D) Its frequency decreases due to the scattering. E) Its energy does not change.

Physics & Space Science

A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is then the frequency of the simple harmonic motion of the mass is

A. 37.2 Hz. B. 30.4 Hz. C. 24.5 Hz. D. 20.1 Hz. E. 14.1 Hz.

Physics & Space Science

For an object in static equilibrium

A. The net torque about any point is zero B. None of these are true. C. The net torque about every point is different D. The net torque about every point is a nonzero constant

Physics & Space Science