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A hunter wishes to cross a river that is 1.4 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respec
The coefficient of kinetic friction between the rock and the surface is 0.300. What average thermal power is produced as the rock stops?
A force vector has a magnitude of 595 newtons and points at an angle 39o of below the positive x axis. What are (a) the x scalar component and (b) the y scalar component of the vector?
A stone is thrown directly upward at 15.0 m/s from ground level and feels no appreciable air resistance. Use the work-energy theorem to find how high it will be when its speed has been reduced to ha
What was the Kinetic energy of the first freight car before collision? What was its velocity before collision? (C) What percentage of the initial kinetic energy is lost in the collision?
A charge of +q is located at the origin, while an identical charge is located on the x axis at x = 0.58 m. A third charge of +4q is located on the x axis at such a place that the net electrostatic
If the animals can manage to hold on, what are their speeds as the rod swings through a vertical position?
A woman walks 300 m in the direction 30° east of north, then 300 m directly east. Find (a) the magnitude and (b) the angle (from due east) of her final displacement from the starting point. (c)
A metallic particle is subjected to the influence of a magnetic field such that it travels downward through a fluid that extends from plate A to plate B.
The speed of a sound in a container of hydrogen at 201 K is 1220 m/s. What would be the speed of sound if the temperature were raised to 405 K?
Find the maximum height y_max reached by the rocket. Ignore air resistance and assume a constant acceleration due to gravity equal to 9.80 rm{m/s^2} .
The astronaut pushes on the satellite, giving it a speed of 0.20 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the in
What would the amplitude of oscillation of the Millennium Bridge have been on the opening day if the damping effects had been three times more effective?
An electron gun inside a computer monitor sends an electron toward the screen at a speed of 1.20 × 108 m/s. If the mass of the electron is 9.109 × 10-31 kg, what is the magnitude of its
A small electric immersion heater is used to boil 82.0 g of water for a cup of instant coffee. Calculate the time required to bring this water from 5.5 °C to the boiling point ignoring any heat lo
A race car has a mass of 701 kg. It starts from rest and travels 41 m in 3.3 s. The car is uniformly accelerated during the entire time. What net force is applied to it?
A 7.0-kg rock is subject to a variable force given by the equation
What friction force must act on the bottom of the ladder to keep it from slipping? Neglect the small force of friction between the smooth wall and the ladder.
The potential energy of a particle moving along the x axis is given by U(x) = 8x2 + 2x4, where U is in joules and x is in meters. If the total mechanical energy is 9.0 J, the limits of motion are:
Consider a simple transformer that has 100-turn primary coil and a 1000-turn secondary coil. What will be the voltage output of the secondary?
A 180 g block on a 40 cm-long string swings in a circle on a horizontal, frictionless table at 76 rpm. What is the speed of the block? what is the tension in the string?
What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?
The three ropes shown are tied to a small, very light ring that is stationary. Two of these ropes are anchored to walls at right angles with the tensions shown in the figure. What is the magnitude
Assume that 3.0 mol oxygen (O2) is heated at constant pressure starting at 27°C. How much energy must be added to the gas as heat to double its volume?