A rifle of slightly more mass, mr = 1.50 kg fires a bullet to the right, with speed 283 m/sec. The mass of the bullet is still mb = 0.025 kg. The size of the rifle's recoil momentum is _______ kg m/sec. Type in your answer to the nearest 0.1 kg m/sec of momentum. E.g., if your answer is 23.48 kg m/sec, then type in 23.5 for your answer.
i got 4.7 but that was wrong apparently.
Apply the principle of conservation of linear momentum, momentum before impact and after impact is conserved. ( momentum= mass x velocity )
The forward momentum of the bullet is P = m x v
The backward momentum of the rifle is v = P/m
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There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is
a.
2ILB.
b.
ILB.
c.
IBL2.
d.
zero.
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the electron at the position of the proton is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
For the same temperature increase in a system, the change in entropy, ?S, is largest in a reversible
A. constant-volume process. B. constant-pressure process. C. adiabatic process. D. process in which no heat is transferred. E. process in which no work is performed.
Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy. b. is the process by which hydrogen and helium are converted into heavier elements. c. describes the structure of a globular cluster. d. describes how the magnetic field of the galaxy traps cosmic rays. e. describes the method by which neutral hydrogen produces 21 cm radiation.