we consider the system to be the ball and the earth?
A. The ball’s gravitational interaction with the earth
B. The ball’s contact interaction with the string
C. Both interactions
D. Neither interaction
D. Neither interaction
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The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?
A) 34.7° B) 53.7° C) 45.0° D) It will not continue, but will be totally reflected.
How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 × 10^–5 W•m
a. 10 m c. 7.1 m b. 2.2 × 10^2 m d. 3.0 × 10^3 m
The following statements all refer to the human brain when mental activity is occurring. Which statement is correct?
a. In order to detect electric currents in the brain, you must open the skull and make direct electrical contact with the brain. b. The electric currents in the brain can be detected outside the brain by detecting the magnetic fields they produce. c. The electric currents in the brain can be mapped by shaving a person's head and dropping iron filings on the head. d. The electric currents in the brain produce an aura that can be detected visually. e. The electric currents in the brain cannot be detected by any means.
A miniature spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 7.00 g, and the gun and puck have a combined mass of 150 g. With the system initially at rest, the radio controlled trigger releases the bullet causing the puck and empty gun to move with a speed of 0.530 m/s. What is the bullet's speed?
a. 83.2 m/s b. 75.7 m/s c. 12.4 m/s d. 11.4 m/s e. 296 m/s