A net force acting on an object will always cause a change in the object's ________
A) speed B) mass C) direction D) momentum
D
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Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
When the temperature of the Sun's core goes down, what happens next?
A) Fusion reactions slow down; the core expands and heats. B) Fusion reactions speed up; the core expands and cools. C) Fusion reactions slow down; the core shrinks and heats. D) Fusion reactions speed up; the core shrinks and cools.
Compton Scattering: A 140-keV photon strikes an electron and scatters through an angle of 120° from its original direction. (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)(a) What is the wavelength of the photon before scattering?(b) What is the photon wavelength after scattering?
What will be an ideal response?
When a neutron is emitted from an unstable nucleus, the atomic mass number of the nucleus
A) does not change. B) decreases by 2. C) decreases by 1. D) increases by 2. E) increases by 1.