Find the pressure amplitude (in Pa) of a 1.00 kHz sound wave in air, given that the displacement amplitude is 1.10 ✕ 10−8 m. [Note: The equilibrium density of air is rho]

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit