Ralph walks 3 m to the left in 2 seconds, then 4 m to the right in 3 seconds. Next, he stops for 3 seconds, and finally walks 5 m to the left in 4 seconds
Ralph's final position is closest to:
1.0 m
2.2 m
3.4 m
4.6 m
5.8 m
6.10 m
7.12 m
8.14 m
9.The negative of one of the choices above
10.Impossible to determine
10
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When a proton and an antiproton collide
a. they destroy each other and produce energy in the form of gamma rays. b. one of the protons is converted to a neutron and they form a nucleus consisting of one proton and one neutron. c. one of the protons is converted to an electron and they form a hydrogen atom. d. one proton is converted to a neutron and the other is converted to an electron. e. A proton and an antiproton cannot collide because the Coulomb barrier is too great.
Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop is parallel to the magnetic field?
A. 13 × 10-3 T ? m2 B. 2.6 × 103 T ? m2 C. 0.80 T ? m2 D. 2.6 × 10-3 T ? m2 E. 0 T ? m2
You push your 2 kg physics book along a tabletop, pushing it with 10 newtons of force. If the book is greased so that friction is negligible, the book's acceleration is
A) zero. B) 0.2 m/s2. C) infinitely large. D) 5 m/s2. E) 20 m/s2.
The intensity of a 50-dB whistle is doubled. What is the new decibel level?
a. 50 dB b. 47 dB c. 53 dB d. 100 dB