Addition by 1. Components: Two boys, Joe and Sam, who are searching for buried treasure start underneath the same tree. Joe walks 12 m east and then 12 m north, while Sam walks 15 m west and then 10 m south. Both boys then stop. Find the magnitude and direction of the vector from Sam to Joe. Express the direction of this vector by specifying the angle it makes with the west-to-east direction.
What will be an ideal response?
35 m at 39° north of east
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Newton's Second Law in 1 Dimension: A block is on a frictionless table, on earth. The block accelerates at 3.0 m/s2 when a 20 N horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/s2. The weight of the block on the Moon is closest to
A. 11 N. B. 9.5 N. C. 8.1 N. D. 6.8 N. E. 5.5 N.
Three different bodies-a uniform sphere, a uniform disk, and a hoop-all have same radius and same mass. The body with the largest rotational inertia will be
A. the disk. B. the hoop. C. the sphere. D. none, as all have the same value of rotational inertia.
Chromium-55 (54.9408 u) emits an electron leaving a daughter nucleus of manganese-55 (54.9380 u). How much energy is released in this reaction? (1 u = 931.5 MeV/c2)
a. 2.61 MeV c. 5.59 MeV b. 0.70 MeV d. 1.40 MeV
An apple weighing 3 newtons hangs, motionless, from a tree branch. The net force on the apple is
A) impossible to determine from the information that is given. B) 3 newtons upward. C) 6 newtons downward. D) 3 newtons downward. E) None of the above.