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calculate the horse power of a man who can chew ice at the rate of 60 g /min . given J = 4.2 /cal and latent heat of water = 80 cal/g , 1 HP = 746 WATTS
Calculate the number of electrons in a steel (iron) pinhead. The pinhead may be assumed to be spherical with diameter 2 mm
A submarine dives to a depth of 190 feet in the ocean. What is the force in pounds acting on a hatch that has a area of 3.7 square feet
A pendulum is made of a long narrow stainless steel rod and has aperiod of T seconds at -200.0 degrees C. If the temperatureincreases to +400.0 degrees C, what is the new period?
a 140 g baseball is moving horizontally to the right at 25 ms when it is hit by the bat. the ball flies off to the left
An electric field is given by -E = 10-a x + 20a-y + 20a-z V/m. Is this a uniform field? Why? What is its magnitude? What are the cosines of the angles it makes with the unit vectors?
Two point charges q1 = 3.40 nC and q2 = -5.50 nC are 0.100m apart. Point A is midway between them; point B is 0.080 m from q1 and 0.060 m from q2. Take an electric potential to be zero at infinity.
A solar cell generates a potential difference of 0.0866 V when a 500 ? resistor is connected across it, and a potential difference of 0.1333 V when a 1000 ? resistor is substituted. What is the internal resistance of the solar cell? What is the emf o..
A 25 g glass tumbler contains 370 mL of water at 24°C. If two 11 g ice cubes each at a temperature of -3°C are dropped into the tumbler, what is the final temperature of the drink
The gun of a barrel is .600m long. A bullet is shot at apendulum that reaches a height of 1.8m once the bullet strikes. Find the recoil of the gun
A solid cube of mass 40kg and edge length .30mrests on a horizontal floor. A person then pushes on the upper edgeof the cube with a horizontal force of magnitude F. At what valueof F will the cube start to tip? Assume the frictional force from the fl..
A roller coaster car crosses the top of a circular loop-the-loop at twice the critical speed. Find the ratio of the car apparent weight to its true weight
In a defribrillator, which delivers the electric energy stored in the 175x10^-6F capacitor to restore the heart's regular beating, find the energy stored in the charged-up defribrillator
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