In positron decay, the number of protons in the nucleus is
A) decreased by 1.
B) decreased by 2.
C) increased by 1.
D) increased by 2.
E) remains unchanged.
A
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A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200
What is the friction force on the box if (a) a horizontal 140-N push is applied to it? (b) a horizontal 175-N push is applied to it?
A bowling ball has a mass of 7.00 kg, a moment of inertia of 2.80 × 10^?2 kg·m2, and a radius of 0.100 m. If it rolls down the lane without slipping at a linear speed of 4.00 m/s, what is its total kinetic energy?
a. 78.4 J b. 22.4 J c. 56.0 J d. 40.0 J
If you hear a tree fall, you know:
a. that the momentum of the tree was conserved in the collision. b. that the tree hitting the ground was an elastic collision. c. that the tree hitting the ground was an inelastic collision. d. that kinetic energy increased when the tree hit the ground. e. that kinetic energy was unchanged when the tree hit the ground.
In titanium alloys called “mill annealed,” the alloy is not _________, it is only annealed after deformation.
Fill in the blank(s) with the appropriate word(s).