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You and your friends find a rope that hangs down 18m from a high tree branch right at the edge of a wide river. How long must you hang on if you want to stay dry
A student pushes a 60 kg couch across a carpet at a constant velocity. find the magnitude of the force of the student on the couch
Two ropes are pulling upward on a large crate. The weight of the crate is 350. N. The tension in the left rope is the same as the tension in the right rope. what is the tension in the left rope
A ball is thrown toward a cliff of height h with a speed of 31m/s and an angle of 60 degrees above horizontal. What was the maximum height of the ball
You charge an initially uncharged 80.9-mF capacitor through a 46.7-? resistor by means of a 9.00-V battery having negligible internal resistance. What is the charge after a long time
A 300 kg elevator is being pulled upwards by a steel cable at a constant velocity. What is the net force on the elevator
Three 45 ohm lightbulbs and three 75 ohm lightbulbs are connected in series. what is the total resistance of the circuit
Two 2.3-cm-diameter electrodes with a 0.10-mm-thick sheet of Teflon between them are attached to a 9.0 battery. What is the charge before the Teflon is removed
The current supplied by a battery in a portable device is typically 0.131 A. Find the number of electrons passing through the device
A milliammeter reads 15mA full scale. It consists of a 0.20 Ohm resistor in parallel with a 36 Ohm galvanometer
A common capacitor found in the lab is in the form of a cylinder of length 2.5 cm. What is the value of the capacitance
Paper has a dielectric constant of 3.5 and a dielectric strength of 16 kV/mm. What is the capacitance of the device
The driver of a car wishes to pass a truck that is traveling at a constant speed of 19.3 m/s . Initially, the car is also traveling at a speed 19.3m/s, How much time is required for the car to pass
The plumbing in an old house uses lead pipes (which are now considered hazardous). what is the change in the length of the pipe
A copper-bottomed kettle, its bottom 24 cm in diameter and 3.0 mm thick, sits on a burner. What is the temperature of the bottom surface of the kettle
A projectile is fired at an angle of 45° with initial kinetic energy E0. At the top of its trajectory, What is the speed of the first fragment
A dog running in the +y-direction at 7.0 m/s hears its owner call from behind, Compute the dog's change in velocity
You drive west at 70km/h for 24 min , then follow a road that goes 38 degrees south of west, driving at 96 km/h for another 36 min. Find your average velocity for the trip
A 17.0-g piece of Styrofoam carries a net charge of -0.75 µC and is suspended in equilibrium above the center of a large, compute the charge per unit area on the plastic sheet
A girl delivering newspapers covers her route by traveling 4.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. What is the total distance she travels
Lead has a latent heat of fusion of 2.32x10^4 J/kg, a specific heat of 128 J/(kg K), and a melting point of 228°C. determine velocity needed to achieve melting the bullet
A carpenter is driving a nail into a board. The 1.25 kg hammer moves at 8.85 m/s when it strikes the nail. What is the change in length of the nail
A log floats in a river with 1/5 of its volume above the water. Density of water is 1000 kg/m, how much of the volume is now above the water
A bucket of mass 1.60 is whirled in a vertical circle of radius 1.45. Find the speed of the bucket
Consider a bird that flies at an average speed of 10.7 m/s and releases energy from its body fat reserves at an average rate of 3.70 W, How far will the bird fly before feeding again