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The focal length of a relaxed human eye is approximately 1.86 cm. When we focus our eyes on a close-up object, we can change the refractive power of the eye by about 18 diopters. Calculate the foca
A 1100 N crate is being pulled across a level floor by a force F of 325 N at an angle of 33° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Fi
Calculate the minimum amount of energy, in joules, required to completely melt 140 g of silver initially at 14.0°C.
A woman stands on a scale in a moving elevator. Her mass is 57.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. Dur
A 10.0 liter gas cylinder is filled with N2 to a pressure of 75.0 atmospheres. How many moles of N2 does one have to add to raise the pressure to 125 atmospheres. Assume a constant temperature of 25
When the wax melts, the block slides out to the end of the rod. What is the final angular velocity? Give your answer in rpm.
A hiker's trip consists of three segments. Path A is 8.0km long heading 60 degrees north of east. Path B is 7.0km long in a direction due east. Path C is 4.0km long heading 315 degrees counterclockw
Boiling point of water at 750 mm Hg is 99.63C. Calculate the amount of sucrose to be added to 500 g of water such that it boils at 100C. kb=0.52 k kg/mol
A 2.0 kg block is attached to a string that is wrapped around a 4.0 kg, 4.0-cm-diameter hollow cylinder that is free to rotate. (Use the figure below, but treat the cylinder as hollow.) The block is
A charge Q is located inside a rectangular box. The electric flux through each of the six surfaces of the box is: 1 = +1600 N · m2/C, 2 = +4000 N · m2/C, 3 = +1600 N · m2/C, 4
The mass of the ball is 0.045 kg, and the duration of the impact with the golf club is 6 x 10-3 s. What is the change in momentum of the ball.
(a) What was the magnitude of the centripetal acceleration of the rock when it was on the string? (b) What was its speed when it was on the string?
What is the calculated pH of the solution if there is initially 2.0mL of acetic acid at an initial concentration of 0.89M and 0.80mL of 1.0M HCl is added?
A 100.0 mL sample of 0.18 M HClO4 is titrated with 0.27 M LiOH. Determine the pH of the solution before the addition of any LiOH.
A 35.0g bullet moving at 475m/s srikes a 2.5kg bag of flour that is on ice, at rest. The bullet passes through the bag and exits it at 275m/s. How far is the bag moving when the bullet exits?
Find the length of a bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on a park bench, given that its proper length is 1.90 m.
Ethylene glycol, the main component of automotive engine coolant, has a specific heat of 2.35 J/g.oC. Calculate the amount of heat required to raise the temperature of 1.00 kg of ethylene glycol fro
A space station, in the form of a wheel 125 m in diameter, rotates to provide an "artificial gravity" of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of r
An automobile tire is pumped up to a gauge pressure of 2.0 × 105 Pa when the temperature is 27°C. What is its gauge pressure after the car has been running on a hot day so that the tire te
A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?
A dipole with dipole moment 1.6 is oriented at 31 to a 5.0 electric field. What is the magnitude of the torque on the dipole?
A refrigerator has a coefficient of performance of 4. If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, what is the heat expelled (in cal) into the heat reservoir ?
A wad of wet putty of mass 0.020 kg drops vertically onto the record from above and sticks to the edge of the record. What is the angular speed of the record immediately after the putty sticks to it
In a tug-of-war between two athletes, each pulls on the rope with a force of 546 N. What is the tension in the rope? What is the absolute value of the horizontal force that each athlete exert again
A sports car crosses the bottom of a valley with a radius of curvature equal to 80 {rm m}. At the very bottom, the normal force on the driver is twice his weight. At what speed is the car traveling?