A person wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 27.6 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.30 10-11 W/m2. What is the intensity delivered to the eardrum?

## What is the maximum speedA simple pendulum has a mass of 0.350 kg and a length of 7.00 m. It is displaced through an angle of 12.0° and then released. Solve this problem by using the simple harmonic motion model for the motion of the pendulum. |

## Create an artificial gravity by rotatingIt is proposed that future space stations create an artificial gravity by rotating. Suppose a space station is constructed as a 800-m -diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. |

## How much work is done by the gravitational forceA 5.0-kg object is pulled along a horizontal surface at by a 15 N force acting 20? above the horizontal. How much work is done by the gravitational force |

## What is the electric field at xPositive point charges q and 2q are located at x = 0 and x = 3d, respectively. What is the electric field at x = d (point P)? (Use any variable or symbol stated above along with the following as necessary: k for Coulomb constant.) magnitude E = di.. |

## What is minimum coefficient friction between tires and roadWhat is the minimum coefficient of friction between tires and road. |

## What are the main advantages and drawbacksA 1.80 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats. |

## Determine the thickness of the glassA pair of slits separated by 1.3 mm, are illuminated with monochromatic light of wavelength 573 nm. What is the thickness of the glass |

## Compute how many wavelengths are there in one pulseA certain type of laser emits light that has a frequency of 6.0 × 1014 Hz. How many wavelengths are there in one pulse |

## What maximum elevation does the rocket reachA test rocket is fired straight up from rest with a net acceleration of 20 m/s2. What maximum elevation does the rocket reach |

## Find the initial velocityThe acceleration of a particle is given by ax(t)=? 1.90m/s2 +( 2.90m/s3 )t, Find the initial velocity v0x such that the particle will have the same x-coordinate at time t= 4.04s |

## Q1 a lightbulb emits a spherical wave if the intensity ofq1. a lightbulb emits a spherical wave. if the intensity of the emitted light is 1.2 wm2 at a distance of 2.5 m from |

## What is the direction of the carbon atom after the collisionW hat least energy an incident alpha particle must have to penetrate the gold nucleus. What is the direction of the carbon atom after the collision. |

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