Q1. The bottom of a box has a surface area of 2.50 m2. The mass of the box is 51.5 kg. Acceleration because of gravity at sea level is 9.80 m/s2. What is the pressure exerted by the box where it rests?

Q2. Standing at a crosswalk, you hear a frequency of 520 Hz from the siren of an approaching police car. After the police car passes, observed frequency of the siren is 455 Hz. Establish the car's speeds from these observations.

Q3. Adolescents tend to respond with gut reactions to emotional stimuli, while adults are more likely to respond in more rational, reasoned ways. Recent research suggests that this may be for the reason that-

a. adults have a more completely developed prefrontal cortex.

b. adults have a more completely developed amygdale.

c. adolescents have a less completely developed cerebellum.

d. adolescents have a less completely developed occipital lobe.