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A small electric immersion heater is used to boil 60.0 g of water for a cup of instant coffee. The heater is labeled 165.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 13.5 °C to the boiling point ignoring any heat losses.
A pilot releases a package from a plane flying horizontally at a constant speed. When the package reaches the ground below, what is the horizontal location of the plane
A gun is fired vertically into a m = 1.44 kg block of wood at rest on a thin horizontal sheet directly above it. How high from the sheet will the block rise into the air
A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower and hung down the center of the staircase. What is the height of the tower
A bat at rest sends out ultrasonic sound waves at 53.5kHz and receives them returned from an object moving directly away from it, What is the received sound frequency
Calculate the gyrofrequency of an electron in Earth's magnetic field, having a value of ~ 35 A-m-1. Determine the electron density values required to produce a zero refractive index for the case of propagation parllel to Earth's magnetic field at a f..
A particle known as a pion lives for a short time before breaking apart into other particles. what is the lifetime according to a hypothetical person who is riding along with the pion
A 581-{\rm N} physics student stands on a bathroom scale in an 821-{\rm kg} (including the student) elevator that is supported by a cable. Find the magnitude of the acceleration of the elevator
A 4.3-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.9 m/s2, find the force exerted by the rope on the bucket
Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 470m to be the other plate. How much charge can the cloud hold before the dielectric strength of the air is ex..
A sphere of radius R = 0.325 m and uniform charge density -151 nC/m3 lies at the center of a spherical, find the magnitude of the electric field at the following radial distances from the center of the charge distribution
A 2000 kg submarine rises straight up to the surface of the ocean. what is the submarine's acceleration
In a television set the power needed to operate the picture tube comes from the secondary of a transformer. Find the current in the primary
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