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A 4800 kg truck is parked on a 14° slope. How big is the friction force on the truck?
A 45.0-kg girl is standing on a 144-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the surface of ice
The current supplied by a battery in a portable device is typically 0.131 A. Find the number of electrons passing through the device
Two small metallic spheres, each of mass m = 0.45 g, are suspended as pendulums by light strings from a common point. what is the magnitude of the charge on each sphere
A 20cm long hollow tube of inner diameter 2.8nm, outer diameter 3.0mm is connected to a battery. what is the potential drop across the tube
A dock worker applies a constant horizontal force of 80.5 N to a block of ice on a smooth horizontal floor. What is the mass of the block of ice
Scientists want to place a 3800.0 kg satellite in orbit around Mars. They plan to have the satellite orbit at a speed of 2462.0 m/s in a perfectly circular orbit. What is the acceleration of the satellite in orbit
Copper at 20C has a resistivity of 1.72x10^-8 ohm-m. A potential difference of 2.0V is applied to a 1.00m long copper wire of radius 0.200mm. Find the resistance of the wire
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons).
The wind resistance on the package can be neglected. When releasing the package, at what angle?(in degrees)down from the horizontal must the pilot see the target for the package to land on the target?
An engineer wishes to determine the spring constant of a helical spring. She first puts enough weights on the spring to pull the coils apart. What is the best estimate of the spring constant
In order to calibrate the strength of an Fe-55 source, many measurements of the radiation field are made with the same detector located at different distances.
Two horses pull a large crate of negligible mass at constant speed across a barn floor by means of two light steel cables. What is the work done by each horse
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