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Questions in physics

[Answered] The loudest sound measured one night during a hockey game was 112 dB. The loudest sound measured during a hockey game the next night was 118 dB. What fraction of sound intensity of the second game was the sound intensity of the first game? [tex]L=10 \log \left(\frac{1}{f_0}\right)[/tex] [tex]L=[/tex] loudness, in decibels [tex]I=[/tex] sound intensity, in watts / [tex]m^2[/tex] [tex]I_0=10^{-12}[/tex] watts / [tex]m^2[/tex] A. 0.25 B. 0.78 C. 0.95 D. 0.99

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Which waves can travel through space? A. electromagnetic waves only B. mechanical waves only C. electromagnetic and mechanical waves D. longitudinal and electromagnetic waves

[Answered] Consider a tightly wound 100 turn coil of radius 10 cm carrying a current of 1 A. What is the magnitude of the magnetic field at the center of the coil? The equation for the magnetic field is given by: [tex] B = \frac{\mu_0 n i}{2 a} [/tex] where [tex] \mu_0 [/tex] is the permeability of free space, [tex] n [/tex] is the number of turns, [tex] i [/tex] is the current, and [tex] a [/tex] is the radius of the coil.

[Answered] Situation: James has a balloon filled with air. He decided to squeeze the balloon gently. What change did James observe in the balloon?

[Answered] 1. If a particle's position is given by the expression x(t) = 5t³ - 52t meters, what is the acceleration of the particle after t = 5 seconds? 2. Given D = 5(t⁶ + 1)⁴ meters, find velocity (V) and acceleration (a) at t = 1 second. 3. An automobile moving at a constant velocity of 30 m/s passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 2 m/s². How soon will the second automobile overtake the first?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Which quantities decrease as the distance between a planet and the Sun increases? A. tangential speed B. mass C. gravitational force D. area swept out in a day E. distance traveled in a day

[Answered] A car jack with a mechanical advantage of 6 needs to produce an output force of 600 N to raise a car. What input force is required? A. 6 N B. 100 N C. 600 N D. $3,600 N$