Answer the following statement(s) true (T) or false (F)
1. A person who exerts a 100-N force horizontally in the +x direction on a wall for 10 minutes does positive work on the wall.
2. When an object slides down a frictionless incline, the contact interaction between the object and incline does no work on the object.
3. The interaction does not change the object’s kinetic energy.
4. The interaction does not change the object’s momentum.
5. A heavy ball swings at the end of a chain connected to a hook in the ceiling. Suppose I pull the ball away from its equilibrium position, hold it against my nose (with the chain taut), and then release the ball from rest. The ball swings away and then back toward my face. As long as I don’t move, and the ball is left alone, I can be confident that the ball will not smash my nose.
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Which one of the following is the correct expression for the energy of the photon?
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The cosmic background radiation
a. has a blackbody spectrum. b. has its peak emission in the microwave band. c. corresponds to a blackbody at a temperature of 2.726 kelvins. d. all of the above
Short-term and long-term effects of radiation on the health of the recipient are called ______________ effects
Fill in the blank(s) with correct word