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A small electric immersion heater is utilized to heat 170 g of water for a cup of instant coffee. The heater is labeled "200 watts", which means that it converts electrical energy to thermal energy at this rate. Compute the time required to bring this water from 25°C to 100°C, ignoring any heat losses.
you draw 270 ml of 10 degrees celcius water from the tap and pop it into a 900-w microwave oven to heat for tea. how
Starting from rest at the ground floor, an elevator takes 19.0 seconds for a vertical trip of 70.0 meters. What is the maximum velocity of the elevator
a lamp in a childs halloween costume flashes based on an rc discharge of a capacitor through its resistance. the
Light travels a distance of 0.945m in 4.50ns in a given substance. What is the index of refraction of this substance
7.5 mol of helium are in a 18 L cylinder. The pressure gauge on the cylinder reads 67psi, What are the temperature of the gas in Celsius and the average kinetic energy of a helium atom
A rectangular plate has a length of (20.4 0.2) cm and a width of (8.7 0.1) cm. Calculate the area of the plate
A proton moves through a magnetic field at 25.5% of the speed of light. find the magnitude of the magnetic force acting on the proton
Charge is placed on two conducting spheres that are very far apart and connected by a long thin wire. Find the surface charge density on each sphere
The human eye can barely detect a star whose intensity at the earth's surface is 1.6*10^-11. how many photons per second enter the eye from the star
The distance between the endpoints is 2.79m and exactly 8 cycles are completed in 22.0 seconds. what is the radius, (in meters) and angular velocity of the circular motion
A 55.3-kg ice skater is moving at 4.00 m/s when she grabs the loose end of a rope, Determine the force exerted by the horizontal rope on her arms
an 14 m by 8.5 m house is built on a concrete slab 27 cm thick. what is the heat-loss rate through the floor if the
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