Why is the recoil less if a person holds a gun tightly against the shoulder?
A. The recoil is not less. Since momentum is conserved, the recoil is the same whether or not the gun is held tightly
B. Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced
C. If the gun is held tightly the bullet doesn’t travel as fast so conservation of momentum leads to a smaller recoil velocity of the gun.
B. Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced
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Two cars are traveling in the same direction and with the same speed along a straight highway. Does either driver hear a different frequency from the other car's horn than they would if the cars were stationary?
A) Yes, they both experience a Doppler shift. B) Only the driver of the front car experiences a Doppler shift. C) Only the driver of the rear car experiences a Doppler shift. D) No, because neither driver experiences a Doppler shift. E) It is impossible to predict.
If the Hubble parameter is 25 km/s per million light years, how old is the universe?
A) 10 × 109 y B) 12 × 109 y C) 15 × 109 y D) 20 × 109 y E) 25 × 109 y
For a closed surface through which the net flux is zero, each of the following four statements could be true. Which of the statements must be true? (There may be more than one.)
(a) There are no charges inside the surface. (b) The net charge inside the surface is zero. (c) The electric field is zero everywhere on the surface. (d) The number of electric field lines entering the surface equals the number leaving the surface.
1.(a) only 2.(b) only 3.(b) and (d) 4.(a) and (d)The direction of a magnetic field at a point can be determined by __________
Fill in the blank(s) with correct word